Antenna system of a radio communication terminal

• US 7,071,884 B2
• Filed: 08/28/2003
• Issued: 07/04/2006
• Est. Priority Date: 09/12/2002
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, Tae-Kyu
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): MANCUSO, HUEDUNG XUAN CAO
• Application Number:
  US10/649,954
• Publication Number:
  US 20040058655A1
• Time in Patent Office: 1,041 Days
• Field of Search: 343/702, 343/700.MS, 343/789, 343/872, 455/403, 455/456, 455/561, 455/127.1, 455/572
• US Class Current: 343/702
• CPC Class Codes: H01Q 21/0025 Modular arrays
• CPC Class Codes: H01Q 21/065 Patch antenna array
• CPC Class Codes: H01Q 23/00 Antennas with active circuits or circuit elements integrated within them or attached to them

Abstract

An antenna system of a radio communication terminal includes: a directional antenna for transmitting and receiving an RF signal to and from a base station through a radio link; and an amplifying unit integrated on one board together with the directional antenna and amplifying and filtering the RF signal. A transmistivity of a radio communication terminal is improved, a loss according to a transmission path between an antenna and the radio communication terminal can be compensated, and a speech quality can be maintained by above a certain level even in an area remote from a base station.

Claims

1. An antenna system of a radio communication terminal comprising:

an antenna that transmits and receives a communication signal to and from a communication node;

a sending end amplifying/filtering unit that amplifies and filters the communication signal to be transmitted through a duplexer;

a receiving end amplifying/filtering unit that amplifies and filters the communication signal received through a duplexer;

a closed loop control circuit that generates a control signal according to power of a communication signal output from sending end amplifying/filtering unit; and

a bias unit that separated the communication signal and a power transmitted from a radio communication terminal through a transmission line,

wherein the receiving end amplifying/filtering unit includes a variable amplifier that amplifies a reception communication signal as much as a variable gain according to a control signal, and

wherein the closed loop control circuit comprises;

a coupling unit that branches a transmission output from a final end of the sending end amplifying/filtering unit; and

a detection controller that generates a control signal according to a strength of power of the branched transmission output and applying the control signal to the variable gain amplifier.

2. The system of claim 1, wherein the duplexer separates a transmission path and a reception path of a communication signal at both ends of the sending end amplifying/filtering unit and the receiving end amplifying/filtering unit.

3. The system of claim 1, wherein the sending end amplifying/filtering unit and the receiving end amplifying/filtering unit comprise, respectively:

a plurality of amplifiers that amplifies a transmission signal and a reception signal;

a filter that filters each signal between amplifiers; and

a power supply unit that supplies power to each amplifier.

4. The system of claim 3, wherein the power supply unit supplies a power transmitted from the bias unit.

5. The system of claim 1, wherein the control signal makes the transmission output and the gain of the variable gain amplifier to be proportional to each other.

6. The system of claim 1, wherein the bias unit further comprises a filter that passes a signal meeting a predetermined filtering criteria.

14. The system of claim 1, wherein the antenna, the sending and receiving end amplifying and filtering units, the closed loop control circuit and the bias unit are mounted together on a same board.

7. An antenna system of a radio communication terminal comprising:

an antenna that transmits and receives a communication signal to and from a communication node;

a sending end amplifying/filtering unit that amplifies and filters a transmission signal;

a receiving end amplifying/filtering unit that amplifies and filters a reception signal; and

a bias unit that separates a communication signal, a power and a control signal transmitted from the radio communication terminal through a transmission line,

wherein the control signal is applied to at least one of the sending and receiving end amplifying/filtering units to adjust a corresponding amplifier gain.

8. The system of claim 7, wherein the bias unit includes a band pass filter that passes a control signal among signals transmitted through the transmission line.

9. The system of claim 7, wherein the sending end amplifying/filtering unit and the receiving end amplifying/filtering unit are connected to a duplexer separating a transmission path and a reception path at both ends.

10. The system of claim 7, wherein the sending end amplifying/filtering unit and the receiving end amplifying/filtering unit comprise, respectively:

a plurality of amplifiers that amplify a transmission signal and a reception signal;

a filter that filters each signal between amplifiers; and

a power supply unit that supplies power to each amplifier.

11. The system of claim 10, wherein the power supply unit supplies a power transmitted from the bias unit to the amplifier.

12. The system of claim 7, wherein at least one of the sending end amplifying/filtering unit and the receiving end amplifying/filtering unit include a variable gain amplifier that amplifies a reception signal as much as a variable gain according to a control signal.

15. The system of claim 7, wherein the antenna, the sending and receiving end amplifying and filtering units, the closed loop control circuit and the bias unit are mounted together on a same board.

13. A radio communication method comprising:

transmitting and receiving a communication signal in an antenna to and from a communication node;

amplifying and filtering a communication signal in a sending end amplifying/filtering unit to be transmitted through a duplexer;

amplifying and filtering the communication signals in a receiving end amplifying filtering unit through the duplexer;

generating a control signal according to power of a transmission communication signal outputted from the sending end amplifying/filtering unit; and

separating the communication signal and a power transmitted from a radio communication terminal through a transmission line,

wherein generating the control signal comprises;

branching a transmission output form a final end of the sending end amplifying/filtering unit; and

generating the control signal according to a strength of power of the branched transmission output and variably controlling a gain of the receiving end amplifying/filtering unit based on the generated control signal.