A Water-Based Dielectric Resonator Antenna with Wide Bandwidth and High Radiation Efficiency

A water-based DRA with a wideband and high radiation efficiency is presented. The DRA features a stacked configuration, with the upside content comprising water and its resin container, and the downside content chosen as K9 glass. Firstly, the wideband performance is obtained by exciting multiple resonant modes simultaneously, including the fundamental TE
111
(y) mode and three higher-order TE
1α1
(z) (α=2,4,6) modes. Secondly, a grating structure is applied in the container to reduce the volume loss density of the water, resulting in a high radiation efficiency. The simulated results show a bandwidth of 65.5% with a radiation efficiency ranging from 80% to 94%.