Compact Cylindrical Sector Dielectric Resonator Antennas

In this paper, we investigate cylindrical sector Dielectric Resonator Antenna (DRA) geometries that are formed by removing a sector (or equivalently a wedge) of dielectric material from a circular cylinder. The advantage this geometry offers, compared to conventional cylindrical DRAs, are reductions in volume, support of "fractional modes", and allowance of dual-frequency/dualfeed operation. Approximate theory, simulation and experimental results are provided to support our findings. In particular, a cylindrical sector DRA is demonstrated to have 75% less volume than a conventional cylindrical DRA, with the same resonant frequency, giving it potential for use in wireless communication handsets. I. Introduction Recently, dielectric resonators have been shown to be practical elements for antenna applications and have several merits including high radiation efficiency, flexible feed arrangement, simple geometry and compactness [1], [2]. In this paper, we investigate cylindrical sector Di..