Electromagnetic characteristics of a thick monopole antenna with dielectric loading

The effect of dielectric loading on the electromagnetic radiation characteristics of thick monopole antennas is investigated. A surface integral equation formulation for a dielectric-loaded thick monopole antenna modeled as a body of revolution is presented. The surface integral equations were solved via the method of moments for the unknown surface current distributions. The numerical data were verified by comparison of the results for input impedance with data available in the literature and with measured data for different configurations. The effects of loading on the input impedance, bandwidth, and beamwidth are considered for antennas mounted on both infinite and finite ground planes. Loads of various shapes and dielectric constants are investigated. Numerical results are presented for various conical and wire monopoles loaded with dielectrics which may partially or completely cover the conducting surface of the antenna