Surface acoustic wave filter device with balanced and unbalanced terminals
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United States of America Patent
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Jun 1, 2004
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N/A
app pub date -
Mar 6, 2003
filing date -
Feb 14, 2000
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Abstract
A surface acoustic wave filter device includes a piezoelectric substrate, and first and second surface acoustic wave filter elements disposed on the piezoelectric substrate. Each of the surface acoustic wave filters has a plurality of IDTs disposed along the surface acoustic wave propagation direction. The first and second surface acoustic wave filter elements are arranged such that they are substantially equal in transmission amplitude characteristic within a band but different in transmission phase characteristic by about 180.degree.. One end of each of the first and second surface acoustic wave filter elements define an unbalanced terminal, and the other end of each of the first and second surface acoustic wave filter elements define a balanced terminal.
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