Duplexer and elastic wave device
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United States of America Patent
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Apr 12, 2011
Grant Date -
Mar 18, 2010
app pub date -
Nov 25, 2009
filing date -
May 28, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
In a duplexer, a transmission elastic wave filter and a reception elastic wave filter are mounted on a laminated substrate, a coil connected between an antenna terminal and a ground potential is provided on the laminated substrate, the reception elastic wave filter has first and second ground pads connected to ground potentials of IDTs connected to first and second balanced terminals, the distance between the second ground pad and the coil is greater than the distance between the first ground pad and the coil, and an inductance component in a conductive path E connecting the second ground pad to the second ground terminal is less than an inductance component in a conductive path D connecting the first ground pad to the first ground terminal, so as to improve isolation characteristics between first and second balanced terminals of a reception filter chip.
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