A Compact And Polarization-Insensitive Perfect Metamaterial Absorber For Electromagnetic Energy Harvesting Application

A polarization-insensitive and compact metamaterial absorber (MMA) was proposed in S band, which could exhibit a perfect absorption for electromagnetic (EM) energy harvesting application. The unit cell design consists of an electric-LC (ELC) resonator structure loaded with resistors backed by a complementary patch. The extracted effective EM parameters and simulated surface current distributions of the designed MMA indicate that the perfect absorption mainly originates from the impedance match and local magnetic resonance. The incident EM energy is mostly dissipated across resistors instead of the dielectric substrate, obviously unlike previous designs. In addition, our design is polarization-independent for normal incident EM waves. Moreover, the proposed MMA is also suitable for a wide variety of microwave EM energy harvesting applications.