Design of a Rectangular-waveguide Bent TE ₂₀ Mode Converter for 150 GHz-band Horizontally-polarized Omni-directional Antenna

A mode converter for a horizontally-polarized horizontally omnidirectional antenna is designed. This converter consists of two rectangular waveguide bends, which converts TE<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</inf> mode to TE<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">20</inf> mode. By connecting two types of tapered waveguides, the rectangular TE<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">20</inf> mode is converted to a circular TE<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</inf> mode, which is designed to radiate omnidirectionally in the horizontal plane.