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Adjustable electronic duplexer

  • US 20030174763A1
  • Filed: 12/09/2002
  • Published: 09/18/2003
  • Est. Priority Date: 12/07/2001
  • Status: Active Grant
First Claim
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1. A duplexer for a communication device having a transmission unit, a reception unit and a shared antenna, the shared antenna transmitting a portion of a transmission signal provided by the transmission unit and receiving a reception signal, said duplexer generating a leakage signal from the transmission unit toward the reception unit, said leakage signal being added to the reception signal, the duplexer comprising:

  • a. a first signal path between said transmission unit and said reception unit, said first signal path comprising a filter unit filtering the reception signal, the filtering unit providing a filtered signal to the reception unit; and

    b. a second signal path between said transmission unit and said reception unit, said second signal path comprising a cancellation unit receiving a sample of the transmission signal and producing a compensation signal;

    whereby an injection of the compensation signal to the first signal path substantially reduces the leakage signal, thereby producing a substantially leakage-free reception signal.

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