Triple-band polarization-insensitive wide-angle ultra-miniature metamaterial transmission line absorber

Abstract

We report on the design, fabrication, and measurement of a triple-band absorber enhanced from a planar two-dimensional artificial metamaterial transmission line (TL) concept. Unlike previous multiband absorbers, this implementation incorporates fractal geometry into the artificial TL framework. As a consequence of the formed large LC values, the utilized element is compact in size, which approaches λ 0 /15 at the lowest fundamental resonant frequency. For independent control and design, a theoretical characterization based on a circuit model analysis (TL theory) is performed and a set of design procedures is also derived. Both numerical and experimental results have validated three strong absorption peaks across the S, C, and X bands, respectively, which are attributable to a series of self-resonances induced in the specific localized area. The absorber features near-unity absorption for a wide range of incident angles and polarization states and a great degree of design flexibility by manipulating the LC values in a straightforward way.

A Novel Six-Band Polarization-Insensitive Metamaterial Absorber With Four Multiple-Mode Resonators

“…One horn antenna is used as the transmitter, and the other is used as the receiver. The sample is placed 1.0 m away from the horn antenna to satisfy the far-field measurement condition that the distance between the sample and the antenna must be greater than the threshold of D 2 /λ = 0.6 m mentioned in [31] and [32]. D = 0.1 m is the maximum dimension of the horn antenna, and λ = 1.7 cm is the shortest wavelength in the frequency range from 2 GHz to 17 GHz.…”

Dual-Band Circular Polarizer and Asymmetric Spectrum Filter Using Ultrathin Compact Chiral Metamaterial

“…A pronounced structural two dimensional (2D) chirality is unambiguously carried out through the near-field interaction between the EM radiation and the interlayer building blocks. Due to the strong space-filling property of the spiral structure, the inductive current path is significantly extended and thus the resulting equivalent inductance and capacitance will be prominently increased in a limited volume [34]. Therefore, lower resonance of the CMM can be envisioned which equals the miniaturization of the meta-atom.…”

“…In this paper, we provide an alternative and efficient strategy to reduce the size of meta-atoms of CMMs inspired from the recent work toward this goal by some of the authors [34][35][36] and investigate two fundamental aspects of the resulting chiral medium, advancing a step from the effective medium concept. The two-turn spiral structure is utilized and the concept can be extended to three turns or multiple turns for an ultra-compact package.…”

Low-frequency metamaterial absorber with small-size unit cell based on corrugated surface

“…6 Metamaterial absorber (MMA) has attracted considerable attention since Landy proposed an ultra-thin perfect absorber composed of artificial sub-wavelength composites. 7 To date, a large number of efforts [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] have been made on MMAs to achieve multi-band absorption, broadband absorption, polarization-insensitive absorption and wide incident angle absorption, due to the important applications in the field of solar cells, 24 thermal emitters 25 and sensors. 26 In general, the traditional MMAs are constructed of a delicate periodic patterned metal layer for minimizing reflection by impedance matching and a background metal layer for blocking transmission, separated by a flat dielectric substrate for dissipating energy.…”