ANALYSIS OF HEMISPHERICAL DIELECTRIC RESONATOR ANTENNA

This paper describes the analysis of a hemispherical dielectric resona tor antenna fed by a coaxial probe. The electric field Green's functio n of a vertical point current located inside the dielectric hemisphere is derived by mode matching technique. Delta gap source excitation mo del is employed. The input impedance of the antenna is calculated usin g a variational formula. Both the broadside TE111 mode (the lowest-ord er transverse electric mode) and the end-fire TM101 mode (the lowest-o rder transverse magnetic mode) are considered. Numerical calculations and experimental results validating the theory are shown. The variatio n of input resistance with dielectric constant of the antenna is studi ed.