The design, fabrication, and experimental validation of wideband reflectarray with concentric coupled half‐square rings operating at 26.5 GHz for 5G communication is presented in this paper. The proposed unit cell has a simple square patch enclosed within the coupled half‐square rings. The varying delay line length attached to the outer ring provides a phase variation of 420°. A center‐fed reflectarray antenna constructed with circular geometry (12.6 diameters) using 413 elements offers a measured gain of 27.1 dBi and 51.25% of aperture efficiency at its center frequency. The measured 3‐ and 1‐dB gain bandwidth of 45% and 28.6% along with a side lobe level (SLL) of −17.6 dB are achieved. The measured cross‐polarization level is less than −28 dB. Thus, the proposed wideband reflectarray has evolved into a provocative candidate for applications like base station antennas in earth exploration satellites, mobile base station satellites, and radio astronomy satellites.
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