ANALYSIS OF A THICK MONOPOLE ANTENNA LOADED WITH DIELECTRIC MATERIAL

A numerical solution for the input impedance and radiation pattern of an arbitrarily shaped, rotationally symmetric monopole antenna loaded with dielectric material is presented. The antenna is mounted over eit her an infinite or a finite ground plane. The excitation is assumed to be due to a coaxial transmission line. Both the magnetic frill curren t-source and the delta-gap voltage-source models are employed in the f ormulations. Numerical data have been obtained and compared with exper imental results and some published data. A conical antenna and a wire antenna loaded with dielectric material are considered, and the effect of the dielectric material and the ground plane size on the antenna i nput impedance and radiation pattern is studied.