Trapped energy piezoelectric filter

Details Trapped energy piezoelectric filter Trapped energy piezoelectric filter

1976-11-29

1978-01-03

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

310321, 310358, 310 98, 310366, H03H 904, H03H 920, H03H 932

Patent

active

040669866

ABSTRACT:
A trapped energy type of piezoelectric filter includes a polarized ceramic wafer 9, input and output electrodes 11, 13 secured to one major surface of the wafer and spaced from each other by a constant width gap, and a ground electrode 15 secured to the opposite major surface underlying the input and output electrodes. The configuration of the ground electrode is made symmetrically concave or convex about its longitudinal axis in varying degrees to thereby control the band pass width, the symmetry of the filter characteristic about a center frequency, and eliminate peak ripples.

REFERENCES:
patent: 3638146 (1972-01-01), Takaku et al.
patent: 4013982 (1977-03-01), Wood et al.

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