Design and Simulation of a Water based Polarization-insensitive and Wide incidence Dielectric Metasurface Absorber for X-, Ku- and K-band

In this paper, the design and simulation of a broadband Metasurface RADAR absorber based on water has been presented. The unit cell of the proposed absorbing structure consists of metal-backed hollow resin shell filled with water. The proposed structure has been designed and optimized using CST MWS STUDIO, to exhibit 90% absorptivity in frequency band 8–29 GHz (covering complete X-, Ku- and K-band) under normal incidence. The four-fold rotation symmetric unit cell design ensures polarization-insensitivity towards the incident radar signal. The performance of the proposed design is also studied under different oblique incidences and it is observed that the proposed structure holds its absorption characteristics up to 60° of angle of incidence for TM mode and up to 45° of angle of incidence for TE mode in the given frequency band. We believe that the proposed absorber finds applications in RADAR stealth.