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Parallel connection multi-stage band-pass filter

  • US 5,097,236 A
  • Filed: 05/01/1990
  • Issued: 03/17/1992
  • Est. Priority Date: 05/02/1989
  • Status: Expired due to Term
First Claim
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1. A parallel connection multi-stage band-pass filter comprising an input terminal and an output terminal for signals, and a plurality of resonators each provided with first and second ports;

  • said resonators having respective resonant frequencies different from and close to each other;

    said first port of each of said resonators being electrically connected to said input terminal through a first impedance matching means;

    said second port of each of said resonators being electrically connected to said output terminal through a second impedance matching means;

    wherein said first port of each of said resonators is electrically connected to said input terminal through said first impedance matching means by inductive coupling;

    said second port of each of said resonators being electrically connected to said output terminal through said second impedance matching means by inductive coupling.

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