Coding metasurface for shaping beams through software-based approach

摘要

We propose a software-based approach to provide an efficient way for designing unit cells based on the optimization algorithm and commercial electromagnetic software. Unit cells are comprised of discretely random lattice, square sub-blocks. The approach combined binary particle swarm optimization (BPSO) and CST Microwave Studio is used to achieve the optimal arrangement of the square metal sub-blocks for desirable performance. It is convenient to obtain 1-bit coding elements with the phase difference of 180^o over a broad operating frequency band by this method. And based on 1-bit coding elements, we design two coding metasurfaces with single beam and dual beam for specific deflection angle. The proposed method provides a smart tool to realize various functional devices and systems.