Broad bandwidth of thin composite radar absorbing structures embedded with frequency selective surfaces

Abstract

The three-layer ultrathin radar absorbing structure (RAS) involving a frequency selective surface (FSS) exhibiting excellent broad bandwidth properties is designed and fabricated. The EW and flaky carbonyl iron powders were used to produce two kinds of silicone rubber matrix magnetic composites for the top and the bottom layer, respectively. The electromagnetic parameters of the composites were measured in the frequency range of 2–18GHz. The middle layer is an FSS in the form of double-square loops with four micro-split gaps in the middle of the outer loop. The results show that the proposed RAS can provide a 10dB absorbing bandwidth of 13.2GHz from 4.8 to 18GHz (1.7mm thickness) and a 10dB absorbing bandwidth of 14.1GHz from 3.9 to 18GHz, covering C-band, X-band and Ku-band (2.0mm thickness). A good match between simulation and measurement results demonstrates the validity of our design.