Novel Absorber Based on Pixelated Frequency Selective Surface Using Estimation of Distribution Algorithm

Abstract

A novel design method for absorber is presented, based on pixelated FSS with common effect of metallic pixels and lumped resistors. Considering the relative position of resistors and pixelated patches, the estimation of distribution algorithm is firstly employed to optimize the absorbing performance. Optimization process demonstrates its availability and high-efficiency. An absorption band (3.08-6.00 GHZ) below -6 dB formed with two strong absorption peaks is achieved, compared with the poor absorption performance in pixelated FSS without resistors. The simulated surface current distributions suggest that the loaded resistors are the main source for energy loss of incident electromagnetic wave, and provide an intuitive explanation to the correlation of optimized unit cell geometry and corresponding absorption peaks. The designed absorber is fabricated and the measured reflectivity curve fits well with the simulated results, which indicates that the availability of novel design method.