Longitudinally-coupled-resonator-type elastic wave filter device
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United States of America Patent
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Jan 20, 2009
Grant Date -
Oct 30, 2008
app pub date -
Jul 17, 2008
filing date -
Sep 22, 2006
priority date (Note) -
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Abstract
In a longitudinally-coupled-resonator-type elastic wave filter device, at least one of two IDTs which are adjacent to each other is provided with a dummy electrode for series weighting in a portion in which the IDTs are adjacent to each other, and at least one of series-weighted portions includes at least one of metallization ratio reducing portion in a first acoustic track and metallization ratio increasing portion in a second acoustic track so as to reduce the difference between the metallization ratio of the first acoustic track passing through a connecting portion of the dummy electrode and the metallization ratio of each of second and third acoustic tracks each placed on either side of the first acoustic track in the direction of propagation of an elastic wave.
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