Design of Ka-band high power miter bend

A method based on quasi-optical technology is presented for designing high power miter bend. It can realize high efficiency transmission in bend circular waveguide for TE0m mode. A conical Gaussian mode is generated from the propagated mode TE0m with the help of mode converter and then converted back to the propagated mode TE0m after the bend. Efficient transmission of the propagated mode is achieved since the conical Gaussian mode could decrease the diffraction losses at the mirror. A megawatt, TE01 mode miter bend with an operating frequency at Ka band is designed with this method. The HFSS results show that the transmission efficiency higher than 98% is obtained in the frequency band of 6.5%.