Vertically polarized omnidirectional reflector antenna fed by a circular waveguide bent TM₀₁ mode converter for the 150 GHz band

Abstract

A vertically polarized horizontal-plane omnidirectional antenna with a circular waveguide bent TM₀₁ mode converter and an axisymmetric single reflector is designed and fabricated for the 150 GHz band. Determining a frequency range of 147.8 GHz to 170.0 GHz as the operational band, where the transmission coefficient ratio of the TE₁₁ mode to the TM₀₁ mode is less than 1/3 that in the designed mode converter, the realized gain is 2.2 dBi to 8.8 dBi, and the angular gain variation at the measured frequencies in the band is 4.9 dB at the maximum in the fabricated antenna