Particle swarm optimization (PSO) hasbeen successfully applied in the design andoptimization of electromagnetic structures.Combined with finite-difference time-domain (FDTD) technique

PSO algorithm was applied in the design of frequencyselective surfaces.Through theuse of graphics processing unit (GPU) acceleration

the FDTD program achieves about 100 times speedup while preserving the broad-band nature of the algorithm.Standard PSO and binary PSO algorithms were implemented to deal with known cell structure and unknown cell structure optimization respectively.The feasibility and efficiency of the proposed optimization scheme areverified by numerical results.