Study of 220GHz high-order mode input coupler

In this paper, a 220 GHz TE0,2 mode input coupler is theoretically investigated. Three-dimensional electromagnetic simulation software is used to establish models for simulation optimization design. By loading grooves in the T-shaped waveguide, the reflection coefficient is reduced. At the same time, eight ridges are dug on the circular waveguide to suppress the generation of the main competition modes TE01 and TE41.The 3dB bandwidth of the TE10-TE02 input coupler at 220 GHz is 31.5 GHz and the maximum transmission is -1.1 dB.