Synthesis of Ultra-Wideband TEM Horn with Inhomogeneous Dielectric Medium

TL;DR

This paper introduces new formulas for inhomogeneous dielectric media in ultra-wideband TEM horns, validated through FDTD simulations showing their impact on voltage ratios and radiation patterns up to 20 GHz.

Contribution

It proposes novel formulas for dielectric permittivity distribution in TEM horns based on geometric optics principles, validated by comprehensive FDTD simulations.

Findings

Formulas accurately predict dielectric effects on horn performance.

Simulation results show significant influence of dielectric medium on radiation patterns.

Validation up to 20 GHz demonstrates practical applicability.

Abstract

There were proposed new formulas for the dielectric medium permittivity distribution along spatial coordinates in the space between a linear TEM-horn's leafs, which were obtained according to the rules of geometric optics in the assumption of the phase center being lumped or distributed. The formulas has been checked by FDTD simulation of an ultra-wideband signal excitation; two cases were studied---when dielectric medium is present, and absent. For these both cases, there was obtained voltage steady-wave ratio, as well as radiation patterns at a set of frequencies up to 20~GHz; the results comparison was performed.