A 2-bit and 3-bit metamaterial absorber-based compressive reflector antenna for high sensing capacity imaging

摘要

This paper describes a new coded sensing system used for imaging metallic objects in its near-field region. The presented system is composed of a compressive reflector antenna (CRA) coated with metamaterial absorbers (MMAs), in order to generate spatial and spectral codes in the imaging domain. The codes are designed to reduce the mutual information between the successive measurements, which results in a higher sensing capacity of the system. The performance of the proposed MMA-based CRA is compared to that of the traditional reflector antenna (TRA) without MMAs. Numerical examples for imaging PEC targets in the near-field of the coded system are presented. The results show that both sensing capacity and imaging performance of the MMA-based CRAs is enhanced when compared to that of the TRA.