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Broadband Circularly Polarized Embedded DRA Array for WLAN Applications

In this paper, a dielectric resonator antenna array is proposed. A broadband circularly polarized half-split embedded cylindrical dielectric resonator antenna with varying permittivity along the radial direction is taken as a single radiating element for a two elemental array configuration developed for the commercial WLAN applications. The proposed antenna array consists of two embedded half cylindrical structures (DRAs). Each embedded structure is a combination of two DRAs of different permittivity along radial direction. The DRA with lower permittivity embedded in the groove of DRA with higher permittivity. A modified coplanar waveguide feed is used to excite the array structure thus the ground plane is modeled over the substrate. By triggering orthogonal modes in CDRA through the feed network, generates circular polarization in the braodside direction and is confirmed by the rotation of electric field lines. The proposed array configuration will shows a significant bandwidth greater than 550MHz with central frequency of 5.25GHz. The maximum gain in broadside direction is found to be 3.99dB.