Saw filter with specified electrode dimensions

Details Saw filter with specified electrode dimensions Saw filter with specified electrode dimensions

1996-10-11

1998-03-24

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313B, 310313D, H03H 9145, H03H 964

Patent

active

057317488

ABSTRACT:
A surface acoustic wave filter has pairs of interdigital transducers and reflectors formed on a 36.degree. Y-X LiTaO.sub.3 substrate, the reflectors sandwiching the interdigital transducers in between. The film thickness h of the electrode fingers of the interdigital transducers and the reflectors is such that 0.06.ltoreq.h/.lambda..ltoreq.0.01 where .lambda. is the wavelength of the surface acoustic wave adapted to be generated by the filter. The width-to-pitch ratio M/P of these electrode fingers for the interdigital transducers and the reflectors is such that M/P.gtoreq.0.6 in order to improve the shape factor of the filter.

REFERENCES:
patent: 3952268 (1976-04-01), Schulz et al.
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patent: 5223762 (1993-06-01), Masaie et al.
patent: 5256927 (1993-10-01), Kato et al.
patent: 5270606 (1993-12-01), Cho et al.
patent: 5300902 (1994-04-01), Satoh et al.
patent: 5432392 (1995-07-01), Kadota et al.
patent: 5434465 (1995-07-01), Sato et al.
patent: 5559481 (1996-09-01), Satoh et al.

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