Abstract: A piezoelectric acoustic resonator with an adjustable temperature compensation capability is disclosed. The piezoelectric acoustic resonator includes: a piezoelectric acoustic reflection structure, a first electrode, a second electrode, a piezoelectric layer between the first electrode and the second electrode, and a temperature compensation layer; wherein the temperature compensation layer is a single-layer temperature compensation layer formed of SixOy material, or a composite temperature compensation layer formed by stacking material with a positive temperature coefficient of sound velocity and material with a negative temperature coefficient of sound velocity; and the temperature compensation layer is configured to: perform reverse compensation for a temperature frequency shift caused by the first electrode, the piezoelectric layer and the second electrode in the piezoelectric acoustic resonator; wherein x:y is not equal to 1:2.

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.

Abstract: A piezoelectric acoustic resonator with an adjustable temperature compensation capability is disclosed. The piezoelectric acoustic resonator includes: a piezoelectric acoustic reflection structure, a first electrode, a second electrode, a piezoelectric layer between the first electrode and the second electrode, and a temperature compensation layer; wherein the temperature compensation layer is a single-layer temperature compensation layer formed of SixOy material, or a composite temperature compensation layer formed by stacking material with a positive temperature coefficient of sound velocity and material with a negative temperature coefficient of sound velocity; and the temperature compensation layer is configured to: perform reverse compensation for a temperature frequency shift caused by the first electrode, the piezoelectric layer and the second electrode in the piezoelectric acoustic resonator; wherein x:y is not equal to 1:2.