C and Inverted-C Shaped Multi-band Metamaterial Absorber

A new design of C-shaped and Inverted C-shaped, multi-band metamaterial absorber (CICMBMMA) is discussed in the presented research paper. The proposed design of CICMBMMA consisted conventional three layers. At the top frequency selective surface it consisted of optimized 0.035 mm patches with C-shape and inverted C-shape embedded inside the square patch, copper metallic layer with a thickness of 0.035 mm is at the bottom, while the FR-4 substrate in the middle has a thickness of 0.8 mm. With measurements of 9 mm x 9 mm x 0.8 mm, the suggested CICMBMMA design is modelled in the CST microwave studio. For the CICMBMMA design, the simulated results revealed reflectance at 5.44 GHz, 17.44 GHz, 18.84 GHz, 27.12 GHz, 28.84 GHz, 33.04 GHz, and 34.20 GHz with coefficients of reflection -17.27 dB, -10.55 dB, - 23.44 dB, -27.71 dB, -32.59 dB, -32.59 dB, -20.90 dB, and -20.78 dB respectively. The uniqueness about the proposed design is that with only three different patches on the top layer it exhibited seven high absorptance bands with pair of bands merged to generate broad-bands lying within frequency range from 5 GHz - 35 GHz with potential applications in stealth technology, reducing RCS, absorption in 5G spectrum.