Design of circularly polarized dielectric resonator antenna using modal polarization current model method

Circularly polarized dielectric resonator antenna (CP-DRA), especially the CP-DRA of cuboidal shape, is most easily manufactured with simple feeding systems. However, the design of the cuboidal CP-DRA has not been fully studied. This paper investigates a design method of the CP-DRA made of a cuboidal dielectric and a single feeding probe located outside. At the first step of the design, we apply the conventional design method of circularly polarized microstrip patch antenna to the CP-DRA, and at the second step of the design we analyze the structure including the feeding probe by the modal polarization current model method repeatedly to find the optimum structural parameters for axial ratio and impedance matching. The frequency of wireless LAN (5 GHz) has been chosen throughout the investigation.