Diversity receiver continuously responsive to best signal

• US 6,771,944 B2
• Filed: 02/13/2001
• Issued: 08/03/2004
• Est. Priority Date: 02/17/2000
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Harano, Nobuya
• Primary Examiner(s): Urban, Edward F.
• Assistant Examiner(s): Jackson, Blane J.
• Application Number:
  US09/781,411
• Publication Number:
  US 20010016477A1
• Time in Patent Office: 1,267 Days
• Field of Search: 455/273, 455/275, 455/276.1, 455/277.1, 455/283, 455/286, 343/860, 343/713, 343/861
• US Class Current: 455/276.1
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• CPC Class Codes: H04B 7/0805 with single receiver and antenna switching H04B7/0822 takes precedence

Abstract

A diversity receiver includes a plurality of antennas, a receiving unit for receiving radio waves via the antennas, a phase adjuster disposed for each said antenna and connected thereto for adjusting a phase angle of a radio wave received by each of the antennas to a value to increase gain of each antenna to which the phase adjuster is not connected, and a switching unit, operative in response to a control signal indicating a selected antenna having a best reception state to receive an external radio wave, for connecting the selected antenna to the receiving unit, for disconnecting the selected antenna from the phase adjuster and non-selected antennas other than the selected antenna, and for connecting the non-selected antennas to the phase adjuster associated therewith. The phase adjuster is connected in a stage subsequent to the switching unit viewed from the antennas. This configuration provides a highly efficient diversity receiver.

Claims

1. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas.

2. The diversity receiver claimed in claim 1, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

61. A transceiver, comprising a diversity receiver in accordance with claim 1.

62. A portable transceiver, comprising a diversity receiver in accordance with claim 1.

3. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continously responsive, during receiption of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed from said phase adjuster circuit, wherein;

each said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas.

4. The diversity receiver claimed in claim 3, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

5. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas, and

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and indicating a transmission state, to connect said transmitting circuit to antennas, from among said plurality of antennas, which are assigned for transmission.

6. The diversity receiver claimed in claim 5, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

7. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antenna to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna;

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and indicating a transmission state, to connect said transmitting circuit to antennas, from among said plurality of antennas, which are assigned for transmission.

8. The diversity receiver claimed in claim 7, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

9. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas, and

said terminating comprises a resistor.

10. The diversity receiver claimed in claim 9, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

11. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna;

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and indicating a transmission state, to connect said transmitting circuit to antennas, from among said plurality of antennas, which are assigned for transmission, and

said terminating circuit comprises a resistor.

12. The diversity receiver claimed in claim 11, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

13. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by each said the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas, and

said terminating resistor reflection adjuster circuit comprises a capacitor and a reactance.

14. The diversity receiver claimed in claim 13, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

15. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna;

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and indicating a transmission state, to connect said transmitting circuit to antennas, from among said plurality of antennas, which are assigned for transmission, and

said terminating resistor reflection adjuster comprises a capacitor and a reactance.

16. The diversity receiver claimed in claim 15, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

17. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said terminating circuit comprises a resistor;

said terminating resistor reflection adjuster circuit comprises a capacitor and a reactance.

18. The diversity receiver claimed in claim 17, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

19. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected; and

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas; and

said phase adjuster comprises capacitors and a reactance.

20. The diversity receiver claimed in claim 19, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

21. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas, and

said phase adjuster comprises capacitors and a reactance.

22. The diversity receiver claimed in claim 21, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

23. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster circuit comprises capacitors and a reactance, and

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and indicating a transmission state, to connect said transmitting circuit to antennas, from among said plurality of antennas, which are assigned for transmission.

24. The diversity receiver claimed in claim 23, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

25. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna;

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster comprises capacitors and a reactance, and

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and indicating a transmission state, to connect said transmitting circuit to antennas, from among said plurality of antennas, which are assigned for transmission.

26. The diversity receiver claimed in claim 25, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

27. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster comprises capacitors and a reactance, and

said terminating means comprises a resistor.

28. The diversity receiver claimed in claim 27, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

29. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna;

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster comprises capacitors and a reactance,

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and indicating a transmission state, to connect said transmitting circuit to antennas, from among said plurality of antennas, which are assigned for transmission, and

said terminating means comprises a resistor.

30. The diversity receiver claimed in claim 29, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

31. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas, and

said phase adjuster comprises capacitors and a reactance, and

each of said terminating resistor reflection coefficient adjuster circuits comprises a capacitor and a reactance.

32. The diversity receiver claimed in claim 31, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

33. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna;

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster comprises capacitors and a reactance,

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and indicating a transmission state, to connect said transmitting circuit to antennas, from among said plurality of antennas, which are assigned for transmission, and

each of said terminating resistor reflection coefficient adjuster circuits comprises a capacitor and a reactance.

34. The diversity receiver claimed in claim 33, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

35. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster comprises capacitors and a

said terminating means comprises a resistor, and

each of said terminating resistor coefficient adjuster circuits comprises a capacitor and a reactance.

36. The diversity receiver claimed in claim 35, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

37. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected; and

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antenna, and

said phase adjuster comprises a strip line or a coaxial line.

38. The diversity receiver claimed in claim 37, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

39. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas, and

said phase adjuster comprises a strip line or a coaxial line.

40. The diversity receiver claimed in claim 39, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

41. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster comprises a strip line or a coaxial line,

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and inputted to indicate a transmission state, to connect said transmitting circuit only to antennas from among said plurality of antennas which are assigned for transmission.

42. The diversity receiver claimed in claim 41, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

43. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna;

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster comprises a strip line or a coaxial line, and

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and indicating a transmission state, to connect said transmitting circuit to antennas, from among said plurality of antennas, which are assigned for transmission.

44. The diversity receiver claimed in claim 43, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

45. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster comprises a strip line or a coaxial line, and

said terminating circuit comprises a resistor.

46. The diversity receiver claimed in claim 45, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

47. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna;

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster comprises a strip line or a coaxial line,

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and indicating a transmission state, to connect said transmitting circuit to antennas, from among said plurality of antennas, which are assigned for transmission, and

said terminating circuit comprises a resistor.

48. The diversity receiver claimed in claim 47, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

49. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna;

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster comprises a strip line or a coaxial line, and

said terminating resistor reflection adjuster circuit comprises a capacitor and a reactance.

50. The diversity receiver claimed in claim 49, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

51. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster comprises a strip line or a coaxial line;

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and indicating a transmission state, to connect said transmitting circuit to antennas, from among said plurality of antennas, which are assigned for transmission, and

said terminating resistor reflection coefficient adjuster circuit comprises a capacitor and a reactance.

52. The diversity receiver claimed in claim 51, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

53. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said phase adjuster comprises a strip line or a coaxial line,

said terminating circuit comprises a resistor, and

said terminating resistor reflection adjustor circuit comprises a capacitor and a reactance.

54. The diversity receiver claimed in claim 53, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

55. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas, and

said terminating resistor reflection adjuster circuit includes a chip capacitor and a reactance.

56. The diversity receiver claimed in claim 55, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

57. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna;

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit; and

a transmitting circuit for transmitting a signal to said antennas, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said switching circuit is responsive to a second control signal, generated externally of said switching circuit and indicating a transmission state, to connect said transmitting circuit to antennas, from among said plurality of antennas, which are assigned for transmission, and

said terminating resistor reflection coefficient adjuster circuit comprises a chip capacitor and a reactance.

58. The diversity receiver claimed in claim 57, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

59. A diversity receiver, comprising:

a plurality of antennas;

a receiving circuit for receiving radio waves via said antennas;

a plurality of phase adjuster circuits, each of said antennas connected to an associated one of said phase adjuster circuits for adjusting the phase angle of the radio waves received by the associated antenna to increase the gain of each antenna to which said associated phase adjuster circuit is not connected;

a switching circuit continuously responsive, during reception of the radio waves, to a first control signal indicating one of said antennas having the best reception state to receive the radio waves, for connecting said indicated antenna to said receiving circuit, for disconnecting said indicated antenna from its associated phase adjuster circuit, and for connecting said non-indicated antennas to their respective associated phase adjuster circuits;

a plurality of terminating circuits, a respective terminating circuit of said plurality of terminating circuits being associated with each of said antennas for terminating a transmission line from the associated antenna; and

a plurality of terminating resistor reflection coefficient adjuster circuits, each terminating resistor reflection coefficient adjuster circuit connecting an associated one of said phase adjuster circuits to an associated one of said terminating circuits, for adjusting a reflection coefficient of an input signal fed thereto from said phase adjuster circuit, wherein;

said phase adjuster circuit is connected in a stage subsequent to said switching circuit viewed from said antennas,

said terminating circuit comprises a resistor, and

said terminating resistor reflection adjuster circuit comprises a chip capacitor and a reactance.

60. The diversity receiver claimed in claim 59, further comprising a determining and controlling circuit responsive to the radio waves received by each of said antennas, for indicating the one of said antennas having the best reception state, and for producing the control signal indicating said indicated antenna.

63. A diversity receiving method, comprising

providing a plurality of antennas;

providing a receiving circuit for receiving radio waves via said antennas;

connecting a respective phase adjuster circuit to each said antenna;

in response to a control signal indicating the antenna of the plurality of antennas having the best reception for receiving external radio waves, connecting the indicated antenna to the receiving circuit, disconnecting the indicated antenna from its respective phase adjuster circuit, and connecting the non-indicated antennas to their respective phase adjuster circuits; and

adjusting by one of said phase adjuster circuits a phase angle of a radio wave received by the respective one of the antennas to a value to increase the gain of each of the antennas to which said respective one of the phase adjuster circuits is not connected.

64. The diversity receiving method claimed in claim 63, further comprising:

connecting a respective transmission line to each antenna;

connecting a respective terminating resistor reflection coefficient adjuster circuit to each transmission line;

connecting a respective terminating circuit to each terminating resistor reflection coefficient adjuster circuit;

adjusting the terminating resistor reflection coefficient adjuster before the terminating means, circuits to adjust the reflection coefficient for an input signal fed to the terminating circuits to a larger value.