Dual-Band Polarization-Insensitive Metamaterial Inspired Microwave Absorber for Lte-Band Applications

Abstract

Abstract-In this paper, the design, simulation and measurement of a dual-band polarizationinsensitive metamaterial inspired microwave absorber are presented. The unit cell is composed of two concentric closed ring resonator (CRR) structures forming octagonal rings which are carved on an FR-4 dielectric substrate to give maximum absorption at dual frequencies of 2.09 GHz and 2.54 GHz. At these frequencies, the minimum reflection coefficients of −29.15 dB and −18.76 dB are achieved with absorption rates of 99.88% and 98.67% and narrow 10 dB bandwidths of 2.62% and 2.76%, respectively. Microwave absorption property of the proposed absorber structure is simulated by setting the perfect electric boundary conditions in four planes whose surface normal vectors are directed perpendicular to the wave propagation direction. These numerical computation settings replicate the rectangular waveguide to be used in the experimental measurements for the comparison between the simulated and experimental results. It is experimentally verified by the waveguide measurement method that the absorption rates about 99% are achieved for dual bands with polarization insensitivity thereby meeting the absorption requirements of LTE-band frequencies for a real time microwave absorber based energy harvesting systems.

An Ultrathin Five-Band Polarization Insensitive Metamaterial Absorber Having Hexagonal Array of 2d-Bravais-Lattice

“…Lesser value of S 11 represents more desired absorption of MA. Most of the proposed metamaterial absorbers have a square array of 2D-bravais lattice with a square geometry of the unit cell [6][7][8][9][10][11][12][13][14][15][16][17][18]. Square geometry has lower degree of symmetry than that of hexagonal.…”

“…It has found many novel applications such as cloaking [2], filters [3], and antennas [4]. After the first proposed Metamaterial Absorber (MA) by Landy et al in 2008 [5], many such MAs which have single and multiband absorption properties have been proposed [6][7][8][9][10][11][12]. MAs have many advantages such as ultra-thin and lightweight compared to conventional absorbers which are bulky and fragile.…”

Design and analysis of a compact ultrathin polarization‐ and incident angle‐independent triple band metamaterial absorber

“…In addition to the single band, dualband and multiband absorbers are reported by researchers. In line of this, Jamilan et al and Kaur et al, presented a dual‐band metamaterial absorber but the size of unit cell is extremely large. Moreover, absorber reported in Reference , fulfills the demand of compact size, however equivalent circuit modeling of the absorber for better insight of the design is not illustrated.…”

“…Subsequently, equivalent circuit model of the proposed absorber is drawn with the help of surface current distributions and electric field distributions. The comparison between proposed absorber and other available designs in References are given in Table . From Table 1, it is confirmed that the proposed design in very prominent structure in terms of size, thickness, high peak absorption, and ease of fabrication.…”

“…6 Nowadays, microwave absorbers have been extensively investigated from few gigahertz to optical frequency ranges for various potential applications. In the past few years, significant research has been carried out in the design of single band, 7 dual band, [8][9][10] and multiband. [11][12][13][14][15][16] Author Dincer et al 7 analyzed the properties of single band absorber theoretically, numerically, and experimentally.…”