Surface acoustic wave filter with different filter portions sati

Details Surface acoustic wave filter with different filter portions sati Surface acoustic wave filter with different filter portions sati

1995-01-17

1997-01-07

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313R, H03H 964

Patent

active

055921353

ABSTRACT:
A SAW filter is configured so that a resonator-type filter portion, in which a plurality of SAW resonators are connected in series and in parallel, and a 3-electrode type serially coupled filter portion, in which three IDTs for inputting and outputting signals are interposed between reflectors, are serially connected on one and the same substrate. The design parameters of the respective SAW resonators are adjusted so that the impedances of respective sides of the filter portions, when viewed from the node of the resonator-type SAW filter portion and the 3-electrode type serially coupled SAW filter portion, substantially have a complex conjugate relationship with each other in the pass frequency band.

REFERENCES:
patent: 4044321 (1977-08-01), Vasile
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patent: 4387352 (1983-06-01), Routh
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patent: 4673901 (1987-06-01), Falkenau et al.
patent: 4706048 (1987-11-01), Atalar
patent: 4954793 (1990-09-01), Misu et al.
U.S. Ser. No. 08/368,981, filed Dec. 27, 1994.
Search Report for European Appl. 95100534.7, mailed May 11, 1995.

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