Theoretical and experimental investigations on rectangular dielectric resonator antennas

TLDR

The study investigates rectangular dielectric resonator antennas with relative permittivity values between 10 and 100. The authors derived first‑order expressions for the resonant frequencies and radiation Q‑factors of the lowest‑order magnetic‑dipole modes, validated them against rigorous theory and experiments, and described probe, microstrip‑slot, and microstrip‑line feeds. Measured radiation patterns show that feed type and mode degeneracy affect cross‑polarisation levels.

Abstract

Theoretical and experimental investigations on rectangular dielectric resonator antennas having a value of /spl epsiv//sub r/, in the range of 10 to 100 are reported. The resonant frequencies and radiation Q-factors of the lowest order "magnetic-dipole" modes are derived on the basis of a first-order theory. The accuracy of the model in predicting the resonant frequency and radiation Q-factor is verified by comparison with results of a rigorous theory and experiments. Various feeds for the antennas such as probe, microstrip slot, and microstrip line are described. Measured radiation patterns are shown and the effect of feed and mode degeneracy on the cross-polarisation levels is discussed.