Ultra Wide Band Four Ridge Metal- Dielectric Feed Horn

An ultra wide band two polarizations four ridge conical metal-dielectric feed horn has been proposed and investigated. The horn has a three-layer dielectric filling and is excited by a circular metal-dielectric waveguide, which is excited by two orthogonally located coaxial lines. Electrodynamic modeling and optimization of horn parameters were carried out using finite element and finite difference in time domain methods. As a result of numerical simulations it is shown that the optimized feed horn provides a reflection coefficient below -15 dB, a stable beamwidth (56°) at the level of -10 to -15 dB, and a stable position of the phase center in the 85% frequency band.