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Cross-aperture coupled circularly polarized dielectric resonator antenna

For circularly polarized (CP) dielectric resonator (DR) antenna design, a DR with special configurations such as the nearly-cubic DR, or a rectangular DR with a specific length-to-width ratio, or a cross-shaped DR is required for CP operation. These requirements for special DR configurations make the CP operation of DR antennas more difficult. This is because it is relatively difficult to form a DR with special configurations and almost impossible to make slight geometrical modifications of the constructed DR, due to the problem of compensating the manufacturing tolerances or the fabrication errors. We demonstrate that, two near-degenerate resonant modes is mainly controlled by adjusting the two arm-lengths of the coupling cross-aperture. To verify the proposed CP design method, the design a circular disk DR antenna is described and details of the experimental results of the resulting CP radiation are presented.