Surface acoustic wave filter with larger driving electrode areas

Details Surface acoustic wave filter with larger driving electrode areas Surface acoustic wave filter with larger driving electrode areas

1997-04-03

1999-06-22

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, H03H 964, H03H 910

Patent

active

059146460

ABSTRACT:
A surface acoustic wave filter element is formed by replacing with a single parallel resonator having a driving electrode whose area is equal to the sum total of the areas of driving electrodes of a plurality of consecutive parallel resonators arranged in a ladder shape, together with serial resonators, for structuring a surface acoustic wave resonator. Also, in a surface acoustic wave filter formed by packaging the surface acoustic wave filter element, ground electrodes of the parallel resonators of the filter element are electrically insulated from each other and are connected to different electrode pads for grounding.

REFERENCES:
patent: 4340834 (1982-07-01), Sato
patent: 4425554 (1984-01-01), Morishita et al.
patent: 4580115 (1986-04-01), Sprengel
patent: 5471178 (1995-11-01), Hickernell
patent: 5506552 (1996-04-01), Seki et al.
patent: 5559481 (1996-09-01), Satoh et al.

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