High‐gain side‐fed reflectarray antenna based on metasurface using sidelobe reduction optimization

This article proposes and designs a low-sidelobe planar reflectarray antenna based on particle swarm optimization (PSO). It is composed of a feed antenna and a plane reflectarray based on metasurface, and the center frequency is 5.8 GHz. The operating frequency range of the feed antenna is 5.4-6.3 GHz, and the maximum gain is 6.3 dB. The planar reflectarray based on PSO is composed of reflector elements of different sizes. The planar reflectarray antenna optimized by the PSO achieves the optimization goal of sidelobe level less than -30 dB, and the sidelobe level can be further reduced as the number of iterations increases. The antenna array adopts a side-fed feed mode to achieve a maximum gain of 22.6 dB, and 1 dB gain relative to the bandwidth accounted for 15.8%. It has great application value in scanning and multi-beam radiation for wireless communication.