Multiple pole bandpass filter having monolithic crystal elements

Details Multiple pole bandpass filter having monolithic crystal elements Multiple pole bandpass filter having monolithic crystal elements

1977-06-06

1983-12-27

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310320, 333191, H03H 952, H03H 956, H03H 960

Patent

active

044233949

ABSTRACT:
A symmetrical two pole monolithic crystal filter is combined with appropriate value fixed capacitors and cascaded with other similar filter elements to provide a high order filter with symmetrical transmission zeros and low passband ripple. The filter includes a piezoelectric resonating element having first and second opposite sides with first and second pairs of electrodes thereon. A first capacitor is coupled to an electrode of the first pair located on the first side and a second capacitor is coupled to an electrode of the second pair of the electrodes located on the first side. A shunting capacitor is used between the electrodes of the first and second pairs located on the first side. A fourth capacitor is coupled from both of the first and second electrodes located on the second side.

REFERENCES:
patent: 4028647 (1977-06-01), Yee

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