Ultra-Thin Multi-Band Polarization-Insensitive Microwave Metamaterial Absorber Based on Multiple-Order Responses Using a Single Resonator Structure

Abstract

We design an ultra-thin multi-band polarization-insensitive metamaterial absorber (MMA) using a single circular sector resonator (CSR) structure in the microwave region. Simulated results show that the proposed MMA has three distinctive absorption peaks at 3.35 GHz, 8.65 GHz, and 12.44 GHz, with absorbance of 98.8%, 99.7%, and 98.3%, respectively, which agree well with an experiment. Simulated surface current distributions of the unit-cell structure reveal that the triple-band absorption mainly originates from multiple-harmonic magnetic resonance. The proposed triple-band MMA can remain at a high absorption level for all polarization of both transverse-electric (TE) and transverse-magnetic (TM) modes under normal incidence. Moreover, by further optimizing the geometric parameters of the CSRs, four-band and five-band MMAs can also be obtained. Thus, our design will have potential application in detection, sensing, and stealth technology.

Study of Energy Scattering Relation and RCS Reduction Characteristic of Matrix-Type Coding Metasurface

“…At oblique incidence, an effective RCS reduction characteristic can also be achieved. Compared with previous works [21][22][23][24][33][34][35][36][37][38][39][40][41][42], our design of the matrix-type random coding MSs has better broadband RCS reduction and wide-angle incidence tolerance. The designed MS is expected to have potential applications in the field of stealth.…”

“…Then, six kinds of MSs based on split-ring resonator (SRR) structure were designed to explore the RCS reduction characteristic. Compared with previous works [21][22][23][24][33][34][35][36][37][38][39][40][41][42], our design has some advantages: Firstly, new random coding method with novel mechanism; Secondly, the structure of basic unit is simple, which can achieve the characteristics of 180 • cross-polarization phase differences by simply rotating the metal cut-wire structure; Thirdly, our design presents the RCS reduction at lower frequency with high relative bandwidth compared with the works published before. Such a simple and effective design may provide some potential applications in the field of stealth.…”

“…This kind of MS merely reflects the incident waves into the backward space rather than transforming EM energy into heat, which lowers the probability of MS being detected by infrared devices [29][30][31][32]. GMS can introduce the artificial wave vector at in-plane direction to control the propagation direction of transmitted and reflected wave beams [33][34][35][36]. The polarization conversion characteristic is used to achieve stable phase difference in a broadband frequency range, which can be applied in the design of GMS.…”

Polarization-insensitive wide-angle-reception metasurface with simplified structure for harvesting electromagnetic energy

“…4 A metasurface is an array of periodically arranged metamaterial unit cells with a thin depth. As another candidate for harvesting EM energy, the metasurface has attracted people's interest because it can not only capture EM waves like a perfect absorber, [5][6][7][8] but also recycle the energy.…”

Ultra-Thin Tunable Plasma-Metasurface Composites for Extremely Broadband Electromagnetic Shielding Applications

“…In recent years, they have been intensely investigated in terms of an abundance of functionalities covering multiple/broadband absorptions [3][4][5][6], spatial filtering [7], polarization control [8] antenna engineering [9], wave-manipulation [1][2][3][4][5][6][7][8][9][10][11][12][13][14], radar cross section reduction [15,16] and cloaking [17]. By setting the electromagnetic (EM) parameters of metasurfaces, one can engineer the amplitude and phase spectra of the reflected and transmitted waves.…”