A two-layer higher-order-mode circularly polarized (CP) rectangular dielectric resonator antenna (DRA) is proposed at a frequency range of 10-13 GHz using a single feed. The configuration incorporates the DRA and a dielectric coat layer with respective dielectric constants of 10 and 3.5. Utilizing the outer layer offers a number of advantages such as a wider impedance and the CP bandwidths of ~21% and 9.5%, respectively, as well as a high gain of ~11 dBic. A close agreement has been achieved between the experimental and simulated results.
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Abdulmajid et al. (2018) studied this question.
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