Surface acoustic wave filter having a weighted reflector with spaced finger groups
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United States of America Patent
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Apr 20, 1999
Grant Date -
N/A
app pub date -
Dec 23, 1996
filing date -
Dec 21, 1995
priority date (Note) -
Expired
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Abstract
A surface acoustic wave filter has one or more acoustic filter tracks. Each track has an input interdigital converter, an output interdigital converter, and a reflector. The reflector reflects surface waves between the input and output inter-digital converter by 180.degree.. The reflector is formed with a multiplicity of reflector electrode fingers which are combined into reflector finger groups. Mutually adjacent reflector finger groups are spaced apart by a defined spacing distance such that respective signals in adjacent reflector finger groups are superimposed in antiphase.
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