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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
First Claim
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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, andwherein 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.

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