Triple-band polarization-insensitive wide-angle ultra-thin planar spiral metamaterial absorber

Abstract

The design, fabrication, and measurement of a triple-band metamaterial absorber are presented. The proposed absorber consists of a metallic planar spiral layer and a metallic ground plane separated by a dielectric layer. Experimental results show that the proposed absorber can perform absorption peaks at three resonant frequencies 9.86 GHz, 12.24 GHz, and 15.34 GHz with the absorption of 99.4%, 96.7%, and 99.1%, respectively. In addition, the absorber with the thickness of λ/35 at the lowest fundamental resonant frequency can operate at a wide range of incident angles under both transverse electric and transverse magnetic polarizations.

Analysis of metamaterial absorber in normal and oblique incidence by using interference theory

“…One is the conventional metamaterial absorber called coupled-model, 16 which can directly obtain the absorptivity from simulations or measurements using conventional method. [4][5][6][7][8][9][10][11] Another one is only the metamaterial resonator (the ground plane is removed) called decoupled-model, 16 which need the above equations for getting the absorptivity via the simulated scattering parameters (S-parameters). Such two models are shown in Figs.…”

“…2,3 Most recent works have focused on the realizations of MMA operated at virous frequency spectra ranged from acoustics through microwave and terahertz to optical bands, by using different metamaterial resonators. [4][5][6][7][8][9][10][11] Little attention, 12-16, 21, 22 however, has paid on the discussions of the theories or mechanisms of absorption, which is very important for potential research of MMA. Among these theoretical studies, impedance matching theory presented by Tao et al 12 is a widely acceptable theory for the MMA analysis.…”

Wide-Angle Polarization Independent Triple Band Absorber Based on Metamaterial Structure for Microwave Frequency Applications

“…In order to restrict the transmission of electromagnetic waves, the complete copper backing has been done with the bottom metallic layer. Many MTM absorber structures have been reported for single-band [12,13], dual-band [14], broadband [15] and triple-band [16,17] applications. Article [18] studies a single-band ultra-compact MTM absorber, which consists of a three-dimensional square frame designed on the top of a metal backed FR4 substrate.…”

“…In Article [16], a novel triple-band polarization insensitive metamaterial absorber constructed with a periodic array of a new resonant structure is explained. A metallic planar spiral structure based triple band absorber is presented in [17].…”

A New Compact Octagonal Shape Perfect Metamaterial Absorber for Microwave Applications

“…Due to the unconventional electromagnetic properties of numerous metamaterials, namely the (-) ve permittivity, (-) ve permeability, (-) ve refractive index, and invisibility, the design and application of MMs has gained the priority of vigorous research [1,2]. Nevertheless, MMs are also being extensively studied for different applications, for instance, perfect absorbers through the wide electromagnetic spectrum from millimetre to nanometre wavelengths [3,4], multiband absorber [5], polarization insensitive absorber [6], imagers and detectors [7,8], and broad band absorber [9], smart antenna, and beam shaping devices [10,11]. A 24 × 24 mm 2 Jerusalem cross with meandered load absorber depicts absorptions of more than 95% at 14.75 GHz and 16.1 GHz [12].…”