A Metamaterial Based Microwave Absorber Composed of Coplanar Electric-Field-Coupled Resonator and Wire Array

Abstract

Abstract-In this paper, we present a new type of a double-negative metamaterial absorber (MMA) with a periodic array composed of in-plane an electric-field-coupled-LC (ELC) resonator and a wire. In contrast to common MMA configurations, a metallic pattern layer of the proposed absorber is placed parallel to the incident wave propagation direction. An appropriately designed combination structure is etched on one side of an FR-4 substrate. Here, we fabricated a prototype absorber with a planar array of 66 × 30 unit cells. Our experiments showed that the proposed absorber exhibited a peak absorption rate greater than 86% at 10.1 GHz irrespective of the incident angles up to 60 • .

A Family of Ultra-Thin, Polarization-Insensitive, Multi-Band, Highly Absorbing Metamaterial Structures

“…However, their performance has often been angle-and polarizationdependent, with a relatively narrow absorption bandwidth, due to the resonant behavior of metamaterial elements. Since modern practical applications require more sophisticated characteristics, such as larger bandwidths or multiple bands of operation as well as wide-angle and polarization-independent responses, a significant research has been triggered -and yet to be expected -for the improvement of these absorbers' overall behavior [10][11][12][13][14][15][16][17][18][19]. Apparently, this is a critical issue for various electromagnetic interference/electromagnetic compatibility (EMI/EMC) problems, like radar-cross section minimization from airplanes, steamboats and other vehicles, EMI protection owing to mobile phones and local area networks, light-trapping structures for photovoltaic systems or terahertz imaging devices [20][21][22][23][24][25].…”

Dual-band polarization angle independent 90° polarization rotator using chiral metamaterial

“…Therefore, many significant studies have focused on the design of chiral metamaterials with strong chirality, including rotating resonator, twisted cross conjugated gammadion, and double four-U structure. The experimentally observed strong chirality is theoretically supported by the model of coupling between bilayer structures [9,13]. However, large ellipticity at resonant frequency remains an obstacle for application in polarization rotators, which calculate the difference between two polarized waves [7,12,13,14,15].…”

“…The experimentally observed strong chirality is theoretically supported by the model of coupling between bilayer structures [9,13]. However, large ellipticity at resonant frequency remains an obstacle for application in polarization rotators, which calculate the difference between two polarized waves [7,12,13,14,15]. Strong inter-cell coupling is proposed to enhance optical activity, providing a small gap [8].…”

“…Because the present resonator possesses rotational C4 symmetry [12,13,14,15,16], the incident wave polarization is insensitive.…”

Four-Band Polarization-Insensitive Metamaterial Absorber Based on Flower-Shaped Structures

“…The absorption of MAs can be defined as A(ω) = 1 − R(ω) − T (ω), where A(ω), R(ω), and T (ω) are the absorption, reflection, and transmission as functions of frequency ω respectively. From microwave to optical frequency, lots of MAs were proposed and investigated widely [10][11][12][13][14][15][16][17]. However, most of the MAs work only for one particular polarization or narrow-band.…”