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We design a compact cavity-backed antenna structure where a dielectric resonator (DR) element is surrounded by a meandered circular slot ring to enhance radiation efficiency. The DR for the antenna is cylindrical in shape and four degenerate HE11δ modes are excited and driven by four, quadrature fed aperture coupled slots. Such a compact implementation hybridizes operation of the DR with the minturized ring as well as the four aperture coupled slots for circular polarization. Measured realized gain values are greater than 5 dBic from 1.14 GHz to 1.55 GHz defining a bandwidth of more than 30%. In addition, the half-power and 3 dB axial ratio beamwidths were measured to be more than 100 • and 200 • , respectively. The proposed design technique to employ such a secondary meandered slot ring may also be useful to improve antenna gain, bandwidth, and efficiency for other antenna and array structures.Index Terms-Broadband antennas, compact antennas, circular polarization (CP), dielectric resonator (DR), slot antenna.

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