No abstract

A new type of X‐band (8–12 GHz) unit cell structure on a single‐layer for broadband reflectarray antennas is presented in this study. To obtain a broadband performance, a unit cell composed of a circular ring and a complementary diagonal patch ring is proposed. This new type unit cell is designed on a 0.183 × λ0 (air‐dielectric) thin dielectric substrate and has a 430° phasing range with slow phase variation. Based on the wide phase variation of the proposed unit cell, a centre‐fed broadband reflectarray antenna is designed with 9 × 9 unit cells, 81 elements on a square plane geometry. The designed reflectarray has 40% aperture efficiency and 96% antenna efficiency at 10.5 GHz. The validity of the reflectarray antenna is verified through measurement and simulation results. The experimental and simulation results are in good harmony. The measured and simulated results show that the maximum gain of the reflectarray antenna is 21.6 dBi at 10.5 GHz and has 23% 1 dB gain bandwidth and 29% 3‐ dB gain bandwidth. Also, the minimum cross‐polarisation discrimination is 31.2 dB at 11 GHz frequency.

This study presents a novel Frequency Selective Surface (FSS) design with angularly stable and polarization independent band-stop response. The presented FSS comprises miniaturized unit cells printed on two layers of the dielectric substrates. The-3dB bandwidth of proposed FSS is between 2.98 GHz and 10.86 GHz frequencies. The unit cell dimension is 0.064λ  0.064λ with the thickness of 0.02λ, where λ is the wavelength of the lower operational frequency. The proposed FSS has angular stability up to 60 for TE polarization. The designed FSS is simulated and analyzed by using the commercial software, CST Microwave Studio. The simulation results are verified by measurements carried on a fabricated prototype and a good agreement is achieved.

No abstract

No abstract