LOW-INSERTION-LOSS PIEZOELECTRIC ACOUSTIC WAVE BAND-PASS FILTER AND REALIZATION METHOD THEREOF

A low-insertion-loss piezoelectric acoustic wave band-pass filter and a realization method thereof are disclosed. The realization method includes the following steps: using one of the first kind of piezoelectric acoustic wave resonators to constitute a series branch; using one of the second kind of piezoelectric acoustic wave resonators 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 the acoustic wave band-pass filter units; wherein an impedance value at a series resonant frequency of the first kind of piezoelectric acoustic wave resonators is less than an impedance value at a series resonant frequency of the second kind of piezoelectric acoustic wave resonators; and an impedance value at a parallel resonant frequency of the first kind of piezoelectric acoustic wave resonators is less than an impedance value at a parallel resonant frequency of the second kind of piezoelectric acoustic wave resonators.