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A miniature dual-band GPS antenna is proposed for compact GPS arrays or portable GPS devices. Slots are cut on the patch to further reduce the antenna size to one inch (y/10 at the L2 band). A single-fed quadrature-phase splitter is designed to reduce the array electronics. Design concepts and procedures are presented along with performance assessment using FEKO.

Attention to dielectric resonator antennas (DRA) has been increasing because of their small size, bandwidth, high radiation efficiency [1] and ease of excitation. Attention was also toward linearly polarized DRA [2-3] and wideband antennas [4-5]. Circularly polarized DRA has been studied experimentally in a sub-array environment. The circular polarization is excited by a cross-slot excitation [6-8] or by designing a crossed-shape dielectric resonator [7]. All these studies have been performed experimentally to excite two orthogonal modes with 90 degree phase shift between them. If single feed is required, a perturbation for the geometry can be used to achieve that. However, always such technique provides very small circular polarization bandwidth. If such antenna is used in a sub-array with a sequential feeding mechanism of each two elements or four elements sub-array a much wider bandwidth for the circular polarization can be achieved. Here, we design a circularly polarized elliptic dielectric resonator with single probe feeding. The probe position and parameters are used to match the antenna and to excite the circular polarizations. The analysis is performed numerically using WIPL-D [9].