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Hybrid resonator microstrip line filters

  • US 6,597,265 B2
  • Filed: 11/13/2001
  • Issued: 07/22/2003
  • Est. Priority Date: 11/14/2000
  • Status: Expired due to Term
First Claim
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1. An electronic filter including:

  • a substrate with a generally planar first surface, said substrate comprising a ferroelectric layer positioned adjacent to said first surface;

    a ground conductor positioned beneath said ferroelectric layer;

    a first linear microstrip positioned on said first surface of the substrate and having a first end connected to the ground conductor;

    a first capacitor connected between a second end of the first linear microstrip and the ground conductor;

    a second linear microstrip, positioned on the first surface of the substrate parallel to the first linear microstrip, and having a first end connected to the ground conductor;

    a second capacitor connected between a second end of the second linear microstrip and the ground conductor;

    a third linear microstrip positioned on the first surface of the substrate between the first and second linear microstrips and parallel to the first and second linear microstrips, and having a first end connected to the ground conductor;

    a third capacitor connected between a second end of the third linear microstrip and the ground conductor;

    a U-shaped microstrip positioned between the first and third linear microstrips, the U-shaped microstrip including first and second extensions positioned parallel to the first, second and third linear microstrips;

    a fourth capacitor connected between a first end of the first extension of the U-shaped microstrip and the ground conductor;

    a fifth capacitor connected between a first end of the second extension of the U-shaped microstrip and the ground conductor;

    an input coupled to the first linear microstrip, wherein each of the fourth and fifth capacitors comprises a voltage tunable dielectric capacitor including a pair of metal electrodes positioned on top of said ferroelectric layer; and

    an output coupled to the second linear microstrip.

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