Ultrathin triple-band polarization-insensitive wide-angle compact metamaterial absorber

Abstract

In this study, the design, realization, and characterization of an ultrathin triple-band polarization-insensitive wide-angle metamaterial absorber are reported. The metamaterial absorber comprises a periodic array of modified six-fold symmetric snowflake-shaped resonators with strip spiral line load, which is printed on a dielectric substrate backed by a metal ground plane. It is shown that the absorber exhibits three distinct near-unity absorption peaks, which are distributed across C, X, Ku bands, respectively. Owing to the six-fold symmetry, the absorber is insensitive to the polarization of the incident radiation. In addition, the absorber shows excellent absorption performance over wide oblique incident angles for both transverse electric and transverse magnetic polarizations. Simulated surface current and field distributions at the three absorption peaks are demonstrated to understand the absorption mechanism. Particularly, the absorption modes come from the fundamental and high-order dipole resonances. Furthermore, the experimental verification of the designed absorber is conducted, and the measured results are in reasonable agreement with the simulated ones. The proposed ultrathin (∼0.018λ0, λ0 corresponding to the lowest peak absorption frequency) compact (0.168λ0×0.168λ0 corresponding to the area of a unit cell) absorber enables potential applications such as stealth technology, electromagnetic interference and spectrum identification.

UHF Metamaterial Absorber with Small-Size Unit Cell by Combining Fractal and Coupling Lines

“…The use of an air layer greatly reduces the weight of the entire absorber. In the microwave anechoic chamber, a pair of double-ridge broadband horn antennas (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) connected to a vector network analyzer (PNA-XN5244A) is used to measure the reflectivity of the proposed absorber. To ensure the remote field conditions, the distance between the absorber International Journal of Antennas and Propagation and antennas is set as 2 meters.…”

“…The incident electromagnetic wave can be absorbed almost 100 percent by the rational design unit cell and dielectric materials. To date, much work has been made on absorbers to achieve multiband absorption and broadband absorption due to its important applications in microwave, terahertz, and optical frequency [6][7][8][9][10][11][12][13][14][15]. A dual-band polarization-independent metamaterial absorber has been designed using a fractal square loop.…”

Wideband Miniaturized Metamaterial Absorber Covering L-Frequency Range

“…In 2008, Landy proposed a perfect metamaterial absorber [1] based on the electromagnetic coupling characteristics of metamaterials. Then, many researchers have done a lot of research in designing MAs with good absorption properties, such as broadband absorption [2][3][4][5][6], multiband [7][8][9] and polarization insensitivity [10][11][12][13]. However, limited to large cell size and narrow bandwidth in the L-frequency range, the MAs will be difficult to be used in practical applications.…”

An Ultra-Thin Low-Frequency Tunable Metamaterial Absorber Based on Lumped Element

“…For instance, the absorption bandwidth can be broadened by constructing the metamaterial absorber array with periodic arrangement or superimposing the different resonance modes within a unit cell [8], [9]. Additionally, the fractal metal structures [10] and the multilayer [11][12][13] were realized to design wideband absorber. As a remarkable method, loading with lumped element was utilized to achieve broadband absorption [14][15][16].…”