Reduced size metallized dielectric resonator antennas

Although conventional dielectric resonator antennas (DRAs) are quite small for their use at frequencies about 5 GHz or above, their size (volume and weight) becomes quite excessive at low frequencies around 1 GHz or so. Three novel DRA configurations are described. For these reported configurations which radiate in two different fundamental modes, the frequency of the antennas is nearly independent of the height. The overall size of these antennas is considerably smaller than conventional DRAs and makes them very attractive for applications at low frequencies around 1 GHz. Simplified models for the analysis of resonant frequencies of these antennas are given. Experimental results on the return loss and radiation patterns of a few sample antennas are reported.