Design of a microstrip‐line‐feed slot‐coupled cylindrical dielectric resonator antenna (DRA) for circular polarization (CP) is investigated experimentally. The occurrence of the two orthogonal near‐degenerate resonant modes is mainly excited by a perturbed annular slot that is, a C‐shaped slot. The CP resonant frequency can be adjusted by using different slot sizes. Experimental results of the proposed C‐slot coupled DRA are presented and discussed.
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Huang et al. (2002) studied this question.