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US 5,184,096 AGranted
Parallel connection multi-stage band-pass filter comprising resonators with impedance matching means capacitively coupled to input and output terminals
AssigneeMurata Manufacturing Co., Ltd.
InventorsKikuo Wakino, Toshio Hishikawa, Youhei Ishikawa, Koichi Takehara, Toru Tanizaki
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Abstract
A parallel connection multi-stage band-pass filter including an input terminal and an output terminal for signals, a plurality of resonators respectively having resonator frequencies different from and close to one another which are electrically connected in parallel to each other between said input and output terminals.
Claims9
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 first impedance matching means;
- said second port of each of said resonators being electrically connected to said output terminal through 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 capacitive coupling;
- said second port of each of said resonators being electrically connected to said output terminal through said second impedance matching means by capacitive coupling.
2 more elements
Dependencies are inferred from the claim text.