Fast design of multilayer cascade metasurface absorbers using particle swarm optimization
A fast design procedure of multilayer cascade metasurface absorbers is presented. By analyzing the equivalent circuit model and applying the circuit parameter extraction method, a rapid design procedure can be realized. Combined with the particle swarm optimization, an optimized performance and structure parameters of the multilayer cascade metasurface absorber can be obtained. Compared with the conventional design methods, the proposed design procedure has the advantages of fast calculation speed and small memory consumption. By applying the proposed design procedure, a three-layer metasurface absorber with outstanding performances is realized. The absorption coefficient of the absorber reaches 90% in a broadband from 2.0GHz to 17.5GHz. The full-wave simulation result agrees well with the result obtained from the equivalent circuit model which verifies the feasibility and efficiency of the proposed design procedure.