A Design of Millimeter-Wave Cavity Filter Based on Multiphysics Analysis

In this paper, in order to solve the problem of the performance degradation of millimeter wave cavity filters under extreme temperatures, this paper designs a fifth-order cavity filter with a center frequency of 25–27 GHz, and analyzes the environmental temperature caused by the copper millimeter wave cavity filter. Design a new structure that uses the inverse piezoelectric effect of piezoelectric materials to offset the environmental impact through piezoelectric materials. By means of multi-physics coupling, the influence of temperature on the cavity filter is offset. It can be obtained through COMSOL simulation that this structure can offset the influence of high temperature and low temperature on the performance of the filter, and complete temperature compensation, which has great practical significance.