Reconfigurable Metasurface Lens Thin Antenna with 3-State Unit Cells in 28-GHz Band

This article presents a metasurface lens thin antenna in 28-GHz band for continuously beam scanning. It comprises a 20×20 array of 3-state unit cells and a slot source as first radiator. In unit cell design, PIN diodes are used to obtain phase states switching. The cascaded structure achieves 360° phase shift coverage with 0°/100°/200° phase states. The antenna aperture size is 100mm×100mm with 40mm height. In full wave simulation, a maximum gain of 23.2dBi and ±40° beam steering angle with over 20.0dBi gain are obtained.