Polarization Stable Triband Thin Square-Shaped Metamaterial Absorber

Abstract

An efficient triband metamaterial absorber is presented for X- and K-band applications. The unit cell is of simple shape. The absorber is fabricated on a thin polyamide, which makes it flexible. The parameters of the designed absorber are optimized. The simulated results show that it has good absorption rate and polarization stability. The stability is exhibited over a wide range in both TE and TE modes of the incident waves. The measured results are on par with the simulated results. The measurement is carried out with the waveguide measurement method.

An Ultrathin Polarization Free Asterick-Shaped Metamaterial Absorber with Quad-Band Characteristics

“…Moreover, the metamaterial property of the proposed structure was also elaborated using permittivity, permeability, and dispersion plots. Compared to other reported MTM-based microwave absorbers, the proposed structure ofers much better electrical thickness of 0.0103 λ 0 except for the absorber reported in [17]. Te proposed work suggests further opportunities in enhancing the miniaturization and ultrathin nature of the microwave absorbers exhibiting multiple bands.…”

“…Wide band absorbers fnd their applications in stealth technology and anechoic chambers, while multiband absorbers are preferred in applications such as radar cross section reduction, radio frequency identifcation, sensing, imaging, and various other communication systems. Sometimes, the composite structure of the multiband absorbers provides polarization sensitive absorption attributes [16,17]. It means their absorption characteristics may get changed due to change in the orientation of the absorber.…”

“…Moreover, a low-profle (0.024 λ 0 ) penta-band trigeminalshaped MTM absorber is proposed and investigated in [16], which shows polarization insensitivity at lower frequency and polarization sensitivity at higher frequency in microwave range. Recently, Lakshmi et al reported a conformal triple band microwave metamaterial absorber, but the rate of absorption is very low at second band [17]. Also, absorption performance is degrading in relation to polarization and incident angle variation due to its complex design.…”

Dumbbell shaped structure loaded modified circular ring resonator based perfect metamaterial absorber for S, X and Ku band microwave sensing applications

“…A unit cell with a high EMR value increases homogeneity and electrical capacity without limitations on fabrication. The dimension of the unit cells of [50][51][52] is smaller compared to our proposed model, whereas 38,53 used larger dimensions for their designed absorbers. The low-cost FR4 material is used as the substrate in all the models presented in the references of [30][31][32][33][34] , including our proposed model.…”