Edge reflection type longitudinally coupled surface acoustic wav

Details Edge reflection type longitudinally coupled surface acoustic wav Edge reflection type longitudinally coupled surface acoustic wav

1998-08-10

1999-11-16

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333196, 310313B, H03H 964

Patent

active

059865237

ABSTRACT:
An edge reflection longitudinally coupled surface acoustic wave filter utilizing an SH-type surface wave includes a piezoelectric substrate having two opposing edge surfaces, and first and second interdigital transducers each having a plurality of electrode fingers and being arranged on the piezoelectric substrate such that a shear horizontal surface wave excited by one of the first and second interdigital transducers is reflected between the two opposing edge surfaces to form a standing wave. Attenuation poles of frequency characteristics of the first and second interdigital transducers are adjacent to the frequency position of spurious responses determined by the distance between the two opposing edge surfaces.

REFERENCES:
patent: 4204178 (1980-05-01), Mitchell
patent: 5184042 (1993-02-01), Kadota et al
patent: 5781083 (1998-07-01), Horiuchi et al.
patent: 5793147 (1998-08-01), Kadota et al.
patent: 5838217 (1998-11-01), Kadota et al.

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