Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
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
Gillman James
Kahler Mark
Motorola Inc.
Nussbaum Marvin L.
Roney Edward M.
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