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A single layer planar antenna is designed for high gain and broadband circular polarization. The metasurface antenna consists of 3 × 3 arrays of 45° rotated slot‐loaded square patches on one side of the substrate. The stub loaded CPW fed aperture is designed on another side of the substrate to excite the metasurface antenna. Moreover, the size of square patches in the middle row is increased to achieve broadband bandwidth in −10 dB reflection coefficient and 3 dB axial ratio. Furthermore, the size of slots in the middle patches is increased to further enhance the bandwidth of −10 dB reflection coefficient and 3 dB axial ratio. The designed antenna has attained an impedance bandwidth of 30% (4.56–6.21 GHz) with an axial ratio bandwidth of 8.6%(5.23–5.7 GHz). Moreover, the peak value of antenna gain is 10.21 dBi which is incredibly very large in single layer planar antennas. The measured and simulated results are almost close to each other.

In this paper, broadband circularly polarized S‐shaped patch antenna is designed with a reactive impedance surface (RIS). Besides the RIS structure, the frequency‐selective surface (FSS) superstrate is deployed to enrich the antenna gain. The S‐shaped patch is modeled on an FR4 glass epoxy and its feed position is set to resonate at 5.3 GHz. The 6 × 6 array size of square patches forms the RIS structure which is inserted in the middle of the S‐shaped patch and ground plane to enhance −10 dB impedance bandwidth and 3 dB axial ratio bandwidth. The 6 × 6 array of unit cells forms the FSS superstrate which is deployed approximately half‐wavelength (≈λ/2) height above the ground plane to act like a Fabry Perot cavity (FPC) resonator antenna for improving the antenna gain. The combination of RIS and FSS with an S‐shaped patch antenna improves the −10 dB impedance bandwidth, 3 dB axial ratio bandwidth, and the gain simultaneously. The proposed antenna resonates over a wide frequency range with a −10 dB impedance bandwidth of 31.8% (4.81–6.63 GHz) and the antenna has a good 3 dB axial ratio bandwidth of 18.9% (4.99–6.03 GHz). The antenna peak gain is around 10 dBi. The proposed antenna prototype is measured in the anechoic chamber and the measured results mimic the simulation results.

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