LOW-INSERTION-LOSS PIEZOELECTRIC ACOUSTIC WAVE BAND-PASS FILTER AND REALIZATION METHOD THEREOF
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United States of America Patent
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Issued Date -
Dec 24, 2015
app pub date -
Aug 26, 2013
filing date -
Jan 11, 2013
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Abandoned
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Abstract
A low-insertion-loss piezoelectric acoustic wave band-pass filter and a realization method thereof are disclosed. The realization method includes: using one first kind of piezoelectric acoustic wave resonator to constitute a series branch; using one second kind of piezoelectric acoustic wave resonator to constitute a parallel branch with a ground terminal; connecting any end of the series branch with a non-ground terminal of the parallel branch to form an acoustic wave band-pass filter unit; and cascading a plurality of acoustic wave band-pass filter units; wherein an impedance value at a series resonant frequency of the first kind of piezoelectric acoustic wave resonator is less than that of the second kind of piezoelectric acoustic wave resonator; and an impedance value at a parallel resonant frequency of the first kind of piezoelectric acoustic wave resonators is less than that of the second kind of piezoelectric acoustic wave resonator.
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