Design and experiment study of overmode bend circular waveguide

One novel overmode bend circular waveguide is designed and studied. The novel approach is as follows: the circular waveguide TM01 mode is converted to half-circular waveguide TE11 mode by inserting fins into the overmode bend circular waveguide along the plane of bend. After transmission by the bend, the half-circular waveguide TE11 mode is re-converted to the circular waveguide TM01 mode. An overmode bend circular waveguide of bend 45° for 2.856 GHz based on this principle is designed and optimized, as well as studied. The experiment results show that：at the center frequency of 2.856 GHz, the loss is about 0.247 dB and VSWR is 1.217. In the range of 2.75 GHz to 2.95 GHz, the loss and VSWR are below 0.53 dB and 1.34 respectively. Curvature radius of the overmode bend circular waveguide i