Abstract-A cross-slot-coupled cylindrical dielectric resonator antenna (DRA) is studied theoretically and experimentally. In previous papers, a cross-slot of unequal slot lengths was centered under the dielectric resonator (DR), resulting in circular polarized operation of the antenna. In the present study, the design is enhanced by setting the centers of the two slots at different positions and taking into consideration the partial independence of the slot modes from the DRA mode. Thus, circular polarization (CP) bandwidth of up to 4.7% is attained experimentally in the broadside direction. It is also shown that a largely asymmetrical structure results in a very high bandwidth, but with the tradeoff of distorted CP operation off-broadside.

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Abstract-Different configurations of bridge-shaped dielectric resonator antennas (b-DRAs) made of high-permittivity materials are presented in this letter. These DRA geometries can be seen as an evolution of the notched rectangular DRAs introduced by other authors, but their operational principle is different. The particularities and advantages of the proposed geometry will be investigated and demonstrated for a single bridge first. Afterward, the concept will be extended to two realizations of well-operating dual-mode b-DRAs with stable radiation patterns and low cross polarization. For the analysis of these structures, a full-wave analysis solver (HFSS) was used. Prototype fabrication and measurements confirm the results of the simulations.

A simple slot-coupled cylindrical dielectric resonator antenna (DRA) with wideband characteristics is studied theoretically and experimentally. In previous studies, the slot has been designed to radiate at the same frequency as the fundamental HEM 11δ mode. In this paper, the partial independence of the slot mode from the DRA mode is discussed and a simple design is described, in which the slot mode and the DRA mode are offset, allowing an impedance bandwidth of 27%.