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Tunable duplexer architecture

  • US 9,048,805 B2
  • Filed: 10/02/2012
  • Issued: 06/02/2015
  • Est. Priority Date: 10/04/2011
  • Status: Active Grant
First Claim
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1. A tunable radio frequency (RF) duplexer comprising:

  • a first hybrid coupler operable to split an RF transmission input signal into a first RF quadrature hybrid transmission signal (QHTS) and a second RF QHTS;

    a second hybrid coupler operable to split an RF receive input signal into a first RF quadrature hybrid receive signal (QHRS) and a second RF QHRS;

    an RF filter circuit operable to pass the first RF QHTS and the second RF QHTS to the second hybrid coupler and to reflect the first RF QHRS and the second RF QHRS back to the second hybrid coupler; and

    wherein the second hybrid coupler is configured to combine the first RF QHTS and the second RF QHTS into an RF transmission output signal and to combine the first RF QHRS and the second RF QHRS into an RF receive output signal.

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