Surface acoustic wave ladder filter utilizing a generated spurio

Details Surface acoustic wave ladder filter utilizing a generated spurio Surface acoustic wave ladder filter utilizing a generated spurio

1996-08-14

1998-11-03

Lee, Benny T.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313D, H03H 964

Patent

active

058314938

ABSTRACT:
A surface acoustic wave (SAW) filter has a ladder-shaped circuit in which first one-port SAW resonators are connected between an input terminal and an output terminal as series resonators and second one-port SAW resonators are connected as parallel resonators. The antiresonant frequency of the second one-port SAW resonators matches the resonant frequency of the first one-port SAW resonators. The distances between interdigital transducers and reflectors of the second one-port SAW resonators are specified such that a spurious component is generated at a frequency between the resonant frequency of the second one-port SAW resonators and the transmission band of the filter in order to improve attenuation characteristics in a blocking band in the vicinity of the transmission band.

REFERENCES:
patent: 4635009 (1987-01-01), Ebata
patent: 5434466 (1995-07-01), Hickernell et al.
patent: 5666092 (1997-09-01), Yamamoto et al.

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