Duplexer having two surface acoustic wave filters on one substrate
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United States of America Patent
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Apr 18, 2006
Grant Date -
Oct 28, 2004
app pub date -
Apr 20, 2004
filing date -
Apr 28, 2003
priority date (Note) -
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Abstract
A duplexer includes two surface acoustic wave filters that are formed on one substrate, at least one of the two surface acoustic wave filters being a ladder filter. In this duplexer, the positional difference between the centers in the surface acoustic wave propagating direction of each two neighboring comb-like electrodes among comb-like electrodes that form series-arm resonators in the ladder filter is equal to or smaller than a fourth of the length in the propagating direction of the comb-like electrode having the larger number of pairs of electrode fingers of each two neighboring comb-like electrodes.
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