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Apparatus and methods for tuning antenna impedance using transmitter and receiver parameters

  • US 20040009754A1
  • Filed: 07/12/2002
  • Published: 01/15/2004
  • Est. Priority Date: 07/12/2002
  • Status: Active Grant
First Claim
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1. An impedance transformation circuit for use with a transmitter, a receiver, and an antenna, the transmitter providing a transmission signal for transmission by the antenna, the antenna providing a received signal having an associated signal parameter to the receiver, the impedance transformation circuit comprising:

  • an impedance adjusting circuit between the antenna and receiver and transmitter, the impedance adjusting circuit being configured to change an impedance difference presented between at least one of;

         1) the transmitter and the antenna, and

         2) the antenna and the receiver, in response to a control signal; and

    a controller that generates the control signal to change the presented impedance difference in response to the signal parameter.

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