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Frequency filtering circuit for wireless communication devices

  • US 7,262,677 B2
  • Filed: 10/25/2004
  • Issued: 08/28/2007
  • Est. Priority Date: 10/25/2004
  • Status: Active Grant
First Claim
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1. A frequency filtering circuit fabricated on an integrated circuit for wireless communications, comprisinga first resonator circuit comprising a first transmission line and a first capacitor coupled to the first transmission line integrated on a semiconductor substrate using semiconductor deposition on the integrated circuit;

  • a second resonator circuit in parallel to the first resonator circuit, said second resonator circuit comprising a second transmission line and a second capacitor coupled to the second transmission line; and

    a coupling circuit that couples the first resonator circuit and the second resonator circuit as part of a diplexer, wherein the coupling circuit includes a third capacitor; and

    a first inductor in parallel to the third capacitor, wherein the third capacitor and the first inductor are coupled to the first transmission line and the second transmission line.

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