Filter devices having reduced spurious emissions from lamb waves
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United States of America Patent
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Jan 22, 2019
Grant Date -
Dec 7, 2017
app pub date -
May 30, 2017
filing date -
Jun 7, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A filter device that reduces spurious emissions generated in a frequency band 1.2 to 1.4 times greater than a center frequency of a passband of a filter. In one example the filter device includes a first filter connected between a common contact and a first signal contact and having a first passband, and a second filter connected between the common contact and a second signal contact and having a second passband with a center frequency in a range of 1.2 to 1.4 times greater than a center frequency of the first passband. The first filter includes a SAW filter formed on a piezoelectric substrate, a SAW resonator formed on the piezoelectric substrate and connected in series between the common contact and the SAW filter, and a dielectric film covering the SAW filter and SAW resonator, the dielectric film having a reduced thickness in a region corresponding to the SAW resonator.
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