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This article presents two designs of circularly polarized antenna with simple circular-shaped radiator and circular slotted ground plane. An arc-shaped microstrip line coupling feed mechanism is used to excite the circular radiating patch. The 3-dB axial ratio bandwidth of the proposed antenna-1 and proposed antenna-2 are 3.33% and 18%, respectively. The proposed design has several advantages such as easy matching, fabrication simplicity, compact size, and wide axial ratio bandwidth. Both the antennas have been designed on FR-4 substrate with dielectric constant 4.4 and thickness 1.59 mm. Simulated and measured results are presented to validate the working of the proposed antennas.
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Srivastava et al. (2018) studied this question.
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