Low loss saw filters with non-sequential coupling and method of

Details Low loss saw filters with non-sequential coupling and method of Low loss saw filters with non-sequential coupling and method of

1998-07-28

1999-07-27

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, H03H 964

Patent

active

059297247

ABSTRACT:
A low loss surface acoustic wave (SAW) filter and method of operation thereof uses non-sequential coupling and, more particularly, cross-coupling to achieve good rejection characteristics with low loss. Strips of metallization are used with a circuit formed of a thin film of metallization. The strips are oriented parallel to an edge of each resonator being cross-coupled. In a six resonator filter, the second and fifth resonators are cross-coupled.

REFERENCES:
patent: 3970970 (1976-07-01), Worley
patent: 4065735 (1977-12-01), Palfreeman et al.
patent: 4609891 (1986-09-01), Solie et al.
patent: 5363073 (1994-11-01), Higgins

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