METHOD FOR IMPROVING POWER CAPACITY OF BULK ACOUSTIC WAVE FILTER, AND FILTERING ELEMENT

摘要

The present invention relates to the technical field of filters, in particular to a method for improving the power capacity of a bulk acoustic wave filter and a filtering element. The method comprises the following steps: step S1: increasing the area of resonators in a current filter, making the power density of the resonators reach a preset value, and recording the current value of a port impedance value of the filter; and step S2: in the cases where the current value is less than a specified value, determining an impedance transformation network according to the current value and the specified value, the impedance transformation network being used for being connected in series to an input end and an output end of the filter so as to form a series body, and making the port impedance of the series body reach the specified value. The present invention does not deteriorate the insertion loss of the filter, and improves the power capacity on the premise of ensuring the performance of the bulk acoustic wave filter.