Analysis and Design of a Wideband Jaumann-Like Radar Absorber Offering High Angular Stability and Polarization Insensitivity

A circuit model of a metasurface antenna cover exhibiting absorption properties in a wide frequency band (1 to 11 GHz) and a transmission window around 5.5 GHz is developed to provide some physical insight into the operation of a frequency selective rabsorber. The structure offers wideband absorption, low insertion losses, and polarization insensitivity to incident TM and TE fields. In addition, the three-layer structure is symmetric and defined by a compact Jaumann-like stack-up of PCBs and is composed of two resistive layers placed on top of a lossless layer. The resistive layers are defined by a Jerusalem cross surrounded by a square-ring structure and tapered dipole arms in both the horizontal and vertical planes. This symmetry supports the noted polarization insensitivity. The unit cell of the bottom metamaterial layer (also referred to as the lossless layer) is composed of a small square-ring slot bridged with the same capacitors as the upper resistive layers. Circuit modeling results, full-wave simulations, and measurements are in agreement.