Geometric transition radar absorbing material loaded with a binary frequency selective surface

In this study, a geometric transition radar absorbing material loaded with a binary frequency selective surface (FSS) is presented. The FSS is designed to improve the absorber´s reflectivity at low frequencies. A genetic algorithm (GA) was used to optimise the binary FSS pattern and its position within the absorber. The binary FSS loaded absorber was optimised for performance for both single- and dual-polarisation schemes and was subsequently evaluated against a previously published square conductive loop FSS loaded absorber. An image processing technique was utilised to assess the sensitivity of the FSS design to variations of small geometric features.