Design and Optimization of a TEM Coaxial Horn for Wideband Operation in Millimeter Waves

Abstract

This work explores a framework of numerical techniques to design a wideband TEM coaxial horn for millimeter waves operation. Firstly, aperture dimensions and flare angle were determined to avoid nulls in vertical radiation pattern at θ F < 55 o. Then, a transition to a 2.92mm connector and a dielectric support for the central conductor are proposed. To enhance electromagnetic performance, Genetic Algorithm (GA) was used to optimize the transition and support dimensions. To address the antenna performance, full-wave electromagnetic analysis based on Finite Element Method was employed. The designed model presented frequency bandwidth larger than 45% (25-40 GHz) with return loss greater than 20dB.