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Switching module with harmonic phase tuning filter

  • US 7,839,234 B2
  • Filed: 07/12/2007
  • Issued: 11/23/2010
  • Est. Priority Date: 10/02/2006
  • Status: Active Grant
First Claim
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1. A switching module comprising:

  • a first harmonic phase tuning filter coupled to a first input of an RF switch;

    said first harmonic phase tuning filter including an input section comprising a T-type LC filter and an output section;

    said first harmonic phase tuning filter configured to provide an output impedance that substantially matches an input impedance of said RF switch at approximately a fundamental frequency;

    wherein said output section is tuned to provide a selected impedance at approximately a harmonic frequency generated by said RF switch;

    wherein said T-type LC filter comprises first and second series legs and a shunt leg coupled between said first and second series legs in a shunt configuration, said shunt leg comprising a first inductor coupled in series with a first capacitor;

    wherein said second series leg comprises a first parallel LC circuit and is tuned to provide a high impedance barrier at approximately said harmonic frequency; and

    wherein said output section includes an output terminal coupled to said first input of said RF switch, and a shunt capacitor directly coupled to said output terminal;

    wherein said selected impedance causes substantially an open circuit at approximately said harmonic frequency.

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