Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

H - Electricity

03

H

H03H 9/64 (2006.01)

Patent

CA 2183281

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.

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