Dual antenna radiotelephone systems including an antenna-management matrix switch and associated methods of operation

• US 6,021,317 A
• Filed: 04/30/1997
• Issued: 02/01/2000
• Est. Priority Date: 04/30/1997
• Status: Expired due to Term

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Irvin, David
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Fuller, Greta J.
• Application Number:
  US08/846,277
• Time in Patent Office: 1,007 Days
• Field of Search: 455/78, 455/101, 455/90, 455/132, 455/133, 455/134, 455/135, 455/140, 455/226.1, 455/226.2, 455/272, 455/277.1, 455/277.2, 455/575, 455/129, 333/101
• US Class Current: 455/78
• CPC Class Codes: H01Q 1/241 used in mobile communications, e.g. GSM H01Q1/247, H01Q1/248 take precedence
• CPC Class Codes: H04B 1/44 Transmit/receive switching
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity

Abstract

Dual antenna radiotelephones which include antenna-management switching means that allow the radiotelephones to assume a plurality of different static and dynamic configurations, either adaptively or in response to user commands. These switching means may also provide a means for connecting the radiotelephone to one or more external antennas, and may facilitate use of diversity reception and or transmission techniques. In one embodiment of the present invention, the radiotelephone includes a transmitter, first and second receivers, a user interface, first and second antennas, and antenna switching means. These antenna switching means selectively couple the transmitter, the first receiver and the second receiver to the first and second antennas. The antenna switching means may be implemented as a matrix switch that selectively electrically connects (i) the transmitter to the first antenna, (ii) the transmitter to the second antenna, (iii) the first receiver to the first antenna and (iv) the second receiver to the second antenna.

Claims

1. A radiotelephone for transmitting and receiving electromagnetic signals, comprising:

a transmitter;

a first receiver;

a second receiver;

a user interface for coupling information between the user and said transmitter and said receiver;

first and second antennas;

a matrix switch which selectively couples said transmitter, said first receiver and said second receiver to said first and second antennas; and

control means associated with said matrix switch for configuring said radiotelephone in a plurality of configurations, said configurations comprising;

a first configuration wherein said first antenna is electrically coupled to said first receiver and electrically isolated from said transmitter and wherein said second antenna is electrically coupled to said transmitter and electrically isolated from said second receiver; and

a second configuration wherein during periods of reception said first antenna is electrically coupled to said first receiver and said second antenna is electrically coupled to said second receiver and wherein during periods of transmission said transmitter is electrically coupled to one of said first and second antennas and electrically isolated from the other of said first and second antennas.

2. The radiotelephone of claim 1, wherein said first antenna has a first polarization and said second antenna has a second polarization substantially different from the polarization of said first antenna.

3. The radiotelephone of claim 2, wherein said second antenna has a polarization orthogonal to the polarization of said first antenna.

4. The radiotelephone of claim 1, further comprising selecting means for selecting between electromagnetic signals received at said first and second receivers.

5. The radiotelephone of claim 4, wherein the plurality of configurations further comprises a fourth configuration wherein during periods of reception said first antenna is electrically coupled to said first receiver and said second antenna is electrically coupled to said second receiver and during periods of transmission said transmitter is electrically coupled to whichever of said first and second antennas received the signal selected by said selecting means during the previous period of reception and electrically isolated from the other antenna.

6. The radiotelephone of claim 1, wherein said plurality of configurations further comprises:

a third configuration wherein said first antenna is electrically coupled to said transmitter and said first receiver and said second antenna is electrically isolated from said transmitter and said second receiver.

7. The radiotelephone of claim 1, wherein said control means further comprises means for configuring said radiotelephone to isolate:

said transmitter from said first and second antennas during periods of reception; and

said first and second receivers from said first and second antennas during periods of transmission.

8. The radiotelephone of claim 1, further comprising a connector for electrically coupling said radiotelephone to an external device, and wherein said matrix switch further selectively electrically connects said transmitter and said first receiver to said connector.

9. The radiotelephone of claim 8, further comprising a second connector for electrically coupling said radiotelephone to a second external device, and wherein said matrix switch further selectively electrically connects said transmitter and said second receiver to said second connector.

10. The radiotelephone of claim 1, further comprising an external antenna, an external duplexer, a first connector and a second connector, wherein:

said first and second connectors are electrically coupled to said external antenna via said external duplexer; and

said matrix switch further selectively electrically connects said external antenna to said transmitter and said first receiver.

11. The radiotelephone of claim 1, wherein said transmitter is capable of transmitting both analog and digital signals and wherein said first receiver is capable of receiving both analog and digital signals, said radiotelephone further comprising analog/digital control means for switching the configuration of said transmitter and said first receiver between analog and digital reception.

12. The radiotelephone of claim 1, wherein said matrix switch comprises:

a first electrical switch along the electrical connection between said first antenna and said transmitter;

a second electrical switch along the electrical connection between said first antenna and said first receiver; and

a third electrical switch along the electrical connection between said second antenna and said transmitter.

13. The radiotelephone of claim 12, wherein said matrix switch further comprises a fourth electrical switch along the electrical connection between said second antenna and said second receiver.

14. The radiotelephone of claim 1, wherein said control means are responsive to commands input via said user interface.

15. The radiotelephone of claim 1, wherein said control means are responsive to commands included in one or more of the electromagnetic signals received by said first or second receivers.

16. The radiotelephone of claim 1, further comprising sensing means, and wherein said control means adaptively configure said matrix switch in response to said sensing means.

17. The radiotelephone of claim 1, further comprising means for selectively electrically connecting said transmitter to whichever of said first and second antennas received the signal selected by said selecting means during the previous period of reception while electrically isolating the other antenna from said transmitter.

18. A method of configuring a radiotelephone having a transmitter, a first receiver, a second receiver, a first antenna, a second antenna and an antenna management matrix switch, comprising the steps of:

receiving configuration control instructions;

in response to the configuration control instructions, selecting between;

a first configuration wherein the first antenna is electrically coupled to the first receiver and electrically isolated from the transmitter and the second antenna is electrically coupled to the transmitter and electrically isolated from the second receiver; and

a second configuration wherein the first antenna is electrically coupled to the transmitter and the first receiver and the second antenna is electrically isolated from the transmitter and the first receiver; and

setting the matrix switch to implement the selected configuration.

19. The method of claim 18, wherein said receiving step comprises receiving control instructions from the user interface.

20. The method of claim 18, wherein said receiving step comprises receiving control instructions from one or more of the electromagnetic signals received by the radiotelephone.

21. The method of claim 18, wherein the radiotelephone further comprises a processor and sensing means and wherein said receiving step comprises receiving control instructions from the processor in response to the sensing means.

22. The method of claim 18, wherein said selecting step further comprises selecting between:

a third configuration wherein during periods of reception the first antenna is electrically coupled to the first receiver and the second antenna is electrically coupled to the second receiver and during periods of transmission the first antenna is electrically coupled to the transmitter and the second antenna is electrically isolated from the transmitter; and

a fourth configuration wherein during periods of reception the first antenna is electrically coupled to the first receiver and the second antenna is electrically coupled to the second receiver and during periods of transmission the second antenna is electrically coupled to the transmitter and the first antenna is electrically isolated from the transmitter.

23. The method of claim 22, wherein said selecting step further comprises selecting between a fifth configuration wherein during periods of reception the first antenna is electrically coupled to the first receiver and the second antenna is electrically coupled to the second receiver and during periods of transmission the transmitter is electrically coupled to one of the first and second antennas and electrically isolated from the other of said first and second antennas.