Two-pole monolithic crystal filter including shunt resonator sta

Details Two-pole monolithic crystal filter including shunt resonator sta Two-pole monolithic crystal filter including shunt resonator sta

1993-05-24

1994-11-29

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310365, H03H 900

Patent

active

053693825

ABSTRACT:
A two-pole monolithic piezoelectric filter (50) provides an improved frequency response at specified frequencies above the center frequency of a two-pole filter; at these frequencies the frequency response exceeds the attenuation of a four-pole filter without any increase in space, volume, or cost by the inclusion of additional resonator stages (64 and 68) formed into the substrate (52). Appropriate selection of the dimensions of these resonator stages can be used to adjust the frequency at which these resonator stages provide additional desired attenuation.

REFERENCES:
patent: 3838366 (1974-10-01), Coussot
patent: 4013982 (1977-03-01), Wood et al.
patent: 4287493 (1981-09-01), Masaie
patent: 4329666 (1982-05-01), Arvanitis
patent: 4625138 (1986-11-01), Ballato

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