A rectangular dielectric resonator antenna (DRA) with a square spiral microstrip feedline is investigated in this paper. The design utilizes a feeding structure to excite two resonant modes (TE-11 and TE1-1 modes) of the rectangular DRA that are spatially orthogonal in polarization and in phase. The antenna with the proposed feeding structure has provided a measured circular polarization (CP) over a bandwidth of » 15:5% in conjunction with an impedance-matching bandwidth of » 31:25% at the same frequency range. The gain of the dielectric resonator antenna varies between 6.8 and 7.2dBi across the bandwidth (7:5 » 8:75GHz). Reasonable agreement between the simulated and measured results is obtained.
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Zhang et al. (2013) studied this question.
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