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Single‐layer low‐profile wideband circularly polarized patch antenna surrounded by periodic metallic plates

This article presents a simple design of circularly polarized (CP) antenna with low profile and wideband operation characteristics. To achieve these desirable features, a truncated corner squared patch is chosen as primary radiating source and surrounded by periodic metallic plates for bandwidth enhancement. Notably, all the radiating elements are designed on a single layer of substrate using printed circuit techniques, which significantly reduces the design complexity. The final prototype with overall size of 0.60λo × 0.60λo × 0.05λo (λo is free‐space wavelength at the center operating frequency) was fabricated and tested. Measured results show that the proposed antenna has wide operation bandwidth of 19.7% (5.1‐6.2 GHz). Additionally, broadside gain ranging from 5.0 to 6.9 dBic is also attained within the operating band. In comparison with the other reported antennas in literature, the proposed one has the simplest design architecture with competitive operating bandwidth.