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Laminated type dielectric filter

  • US 6,294,967 B1
  • Filed: 03/17/1999
  • Issued: 09/25/2001
  • Est. Priority Date: 03/18/1998
  • Status: Expired due to Term
First Claim
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1. A laminated type dielectric filter comprising:

  • an earth electrode substantially surrounding an outer surface of the laminated type dielectric filter;

    a resonator means including at least a first stage symmetric type strip line resonator and a last stage symmetric type strip line resonator, each of said resonators having at least two resonating elements which have substantially the same configuration and are stacked one on the other with interposing a dielectric therebetween, and are aligned in a stacking direction in which said resonator elements are stacked, said resonators being aligned in a direction perpendicular to said stacking direction;

    an input means having an input terminal coupled with said first stage symmetric type strip line resonator;

    an output means having an output terminal coupled with said last stage symmetric type strip line resonator;

    plural interlayer earth electrodes connected to the earth electrode; and

    a coupling electrode coupling said plural symmetric type strip line resonators of the resonator means with each other;

    wherein said resonating elements, earth electrode interlayer earth electrodes, and coupling electrode are mutually separated by means of dielectric layers.

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