Surface acoustic-wave resonator filter having shifted resonant frequencies
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United States of America Patent
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Dec 16, 1997
Grant Date -
N/A
app pub date -
Aug 27, 1996
filing date -
May 11, 1994
priority date (Note) -
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Abstract
A surface acoustic-wave resonator filter having improved group delay time characteristics. The filter comprises three energy-confined acoustic-wave resonator filter sections formed on a piezoelectric substrate. The second resonator filter section is positioned between the first and third resonator filter sections. One frequency in a vertical higher-order mode of the second filter section is placed on the lower-frequency side of one frequency in a vertical higher-order mode of the first and third filter sections. Or, one frequency in a vertical lower-order mode of the second filter section is placed on the higher-frequency side of one frequency in a vertical lower-order mode of the first and third filter sections.
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