Broadband Circularly Polarized Microstrip Patch Antenna With Diamond-Shaped Artificial Ground Structure

Broadband Circularly Polarized Microstrip Patch Antenna With Diamond-Shaped Artificial Ground Structure

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This paper presents a broadband circularly polarized patch antenna with an artificial ground structure (AGS), which has rotated rectangular unit cells with respect to the sides of the rectangular ground plane, as a polarizer.A two-element ( $2 imes Bench 1$ ) array configuration of the antenna is also presented.The rectangular unit cells are rotated by 45° with respect to the sides of a square dielectric substrate, named a diamond-shaped AGS (DAGS).

The overall dimensions of the AGS are smaller than those of the ground plane.The rotated unit cells and the T shirts smaller AGS patch dimensions effectively suppress surface wave resonance on the AGS.The proposed antenna achieves a wide 3-dB axial ratio bandwidth in the boresight direction.

The proposed design has a flatter gain curve in the operating frequency band compared to that for conventional designs.It is found that the array configuration outperforms the single-element structure.