Acoustic wave devices

Details Acoustic wave devices Acoustic wave devices

H - Electricity

03

H

333/89

H03H 9/02 (2006.01) H03H 9/64 (2006.01)

Patent

CA 1149033

1 PHB.32633 ABSTRACT: In an acoustic wave device having a pair of spaced apart reflectors forming a resonant cavity, each reflector consists of an array of parallel reflective elements. At least one of the reflectors is weighted not by simple withdrawal of reflecting elements from a nominal uniform array hut instead by substituting reflec- tive elements of the uniform array with elements provid- ing both net-zero reflection at required positions and also at least partial compensation for the velocity per- turbation which would be produced by such simple with- drawal. Such weighting may be used to suppress the side lobes of the reflector response and hence improve the stopband performance of the acoustic wave device and, for example, a coupled resonator filter in which that device is incorporated.

335570

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