Trap circuit comprising plural piezoelectric resonators intercon

Details Trap circuit comprising plural piezoelectric resonators intercon Trap circuit comprising plural piezoelectric resonators intercon

1990-12-13

1992-09-29

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333192, H03H 958

Patent

active

051516721

ABSTRACT:
In a trap circuit a plurality of cascade-connected three-terminal piezoelectric ceramic resonators having different resonance frequencies, an inductor is connected between input and output terminals of only the resonator having the lowest resonance frequency, and a resistor is connected between input and output terminals of each remaining resonator, so that large attenuation is attained at the respective resonance frequencies and a large attenuation is attained in intermediate regions between the resonance frequencies. Thus, unwanted signals can be eliminated over a large bandwidth.

REFERENCES:
patent: 3566314 (1971-02-01), Bies
patent: 3633134 (1972-01-01), Barrows et al.
patent: 3727154 (1973-04-01), Dailing et al.
patent: 4196407 (1980-04-01), Masaie et al.
patent: 4423394 (1983-12-01), Kinsman
patent: 4651109 (1987-03-01), Inoue

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