High power over-moded circular waveguide to two-way rectangular waveguide power divider

Based on the mode matching method, the reflection and transmission problems of high order modes are analyzed in the high power over-mode circular waveguide to two-way rectangular waveguide power divider during transmission process. The requirement on the over-mode circular waveguide to realize high transmission efficiency is obtained. The power divider is designed at a center frequency 2.88 GHz. The result shows that at the center frequency, the reflection coefficient is about 0.05, the corresponding conversion efficiency of circular waveguide TM01 mode to rectangular waveguide TE10 mode is over 99%, and the power-handling capacity can reach 2.83 GW in vacuum state. In the frequency range of 2.82-2.94 GHz, the reflection coefficient is less than 0.1, and the corresponding transmission efficiency is more than 98%.