Multi-pole crystal filter and method of improving the frequency

Details Multi-pole crystal filter and method of improving the frequency Multi-pole crystal filter and method of improving the frequency

1979-11-08

1981-07-28

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333189, 333191, H03H 956, H03H 958, H03H 960

Patent

active

042813000

ABSTRACT:
A crystal filter including at least one acoustically coupled crystal with at least three resonators thereon with an impedance block connected between the input and output of each crystal and the input and output phases of each crystal being adjusted so that attenuation zeros symmetric about a center frequency are produced to improve the frequency response of the filter without increasing the number of poles.

REFERENCES:
patent: 2248776 (1941-07-01), Och
patent: 3609601 (1971-09-01), Phillips et al.
patent: 3704433 (1972-11-01), Garrison et al.
patent: 4099149 (1978-07-01), Yee

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