Abstract
This paper details the core of the high-order $\pmb{TE_{62}}$ mode generator components – the coaxial resonant cavity. In order to obtain high purity $\pmb{TE_{62}}$ mode and improve the isolation among the modes, we use a cavity with an improved coaxial structure. The slowly variable section open coaxial cavity structure can make the $\pmb{TE_{62}}$ mode well separated from its nearby modes. In this paper, the influence of the inner and outer radii of the coaxial cavity on the resonant frequency is presented. The $\pmb{TE_{62}}$ mode purity of the cavity was calculated by the MATLAB program to be 95.3% and the result of the HFSS simulation after the optimization design of the W-band high-purity $\pmb{TE_{62}}$ mode cavity is given, which is in close agreement with the ideal field distribution.
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