Duplexer, filter and communication module
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United States of America Patent
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Dec 22, 2015
Grant Date -
May 9, 2013
app pub date -
Sep 5, 2012
filing date -
Nov 4, 2011
priority date (Note) -
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Abstract
A duplexer includes: a transmit filter that is connected between an antenna terminal and a transmit terminal and has a plurality of acoustic wave resonators; a receive filter that is connected between the antenna terminal and a receive terminal and has a plurality of acoustic wave resonators; and a delay line or a longitudinal coupling type resonator that is connected in parallel with at least one of the plurality of acoustic wave resonators of the transmit filter and the plurality of acoustic wave resonators of the receive filter and has at least two IDTs (Interdigital Transducers).
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