Compact Cylindrical Sector Dielectric Resonator Antennas

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/dual-feed 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.