Piezoelectric acoustic wave resonator, piezoelectric acoustic wave filter, duplexer and radio frequency communication module

Abstract

The invention provides a piezoelectric acoustic wave resonator, the shape of its effective working area is polygonal, and the first side and the second side in the effective working area correspond to the input side and the output side of the piezoelectric acoustic wave resonator respectively, effectively The outer frame of the work area is defined as a rectangle with the smallest area that can surround the effective work area and has a side that coincides with the first side or the second side; Length, the side perpendicular to one side in the outer frame has the second length, the ratio of the first length to the second length ranges from 1 to 4; the sum of the lengths of the first side and the second side is equal to the perimeter of the effective working area The ratio range is 0.4-0.7, wherein the ratio range of the lengths of the first side and the second side to the perimeter of the effective working area is 0.2-0.35. The invention also provides a piezoelectric acoustic wave filter, a duplexer and a radio frequency communication module. The implementation of the invention can improve the electrical transmission loss of the piezoelectric acoustic wave resonator, and further improve the insertion loss of the piezoelectric acoustic wave filter.

Description

technical field [0001] The invention relates to the field of electronic communication technology devices, in particular to a piezoelectric acoustic wave resonator, a piezoelectric acoustic wave filter, a duplexer and a radio frequency communication module. Background technique [0002] The piezoelectric acoustic wave filter is one of the key components of modern smartphones, and the piezoelectric acoustic wave resonator is the core component of the piezoelectric acoustic wave resonator. Among them, the performance of the piezoelectric acoustic wave resonator directly determines the piezoelectric acoustic wave The pros and cons of filter performance. In the prior art, commonly used piezoelectric acoustic wave resonators include air-gap resonators, bulk silicon back-etched resonators, and Bragg reflection layer resonators. The structure of the piezoelectric acoustic wave resonator will be described below using an air-gap type resonator. Please refer to figure 1 , figure 1 ...

AI Technical Summary

Problems solved by technology

The introduction of inductance / capacitance can increase the effective electromechanical coupling coefficient of the piezoelectric acoustic wave filter and the bandwidth of the piezoelectric acoustic wave filter to a certain extent. The improvement of the filter insertion loss, but at the same time will increase the parasitic effect of the piezoelectric acoustic wave filter, and the piezoelectric acoustic wave will cause some deterioration of the filter performance. In addition, it will also lead to an increase in the volume of the piezoelectric acoustic wave filter and an increase in manufacturing costs.

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