Ultrawideband electromagnetic metamaterial absorber utilizing coherent absorptions and surface plasmon polaritons based on double layer carbon metapatterns

Abstract

An ultrawideband electromagnetic metamaterial absorber is proposed that consists of double-layer metapatterns optimally designed by the genetic algorithm and printed using carbon paste. By setting the sheet resistance of the intermediate carbon metapattern to a half of that of the top one, it is possible to find an optimal intermediate metapattern that reflects and absorbs the EM wave simultaneously. By adding an absorption resonance via a constructive interference at the top metapattern induced by the reflection from the intermediate one, an ultrawideband absorption can be achieved without increasing the number of layers. Moreover, it is found that the metapatterns support the surface plasmon polaritons which can supply an additional absorption resonance as well as boost the absorption in a broad bandwidth. Based on the simulation, the $$90\%$$ 90 % absorption bandwidth is confirmed from 6.3 to 30.1 GHz of which the fractional bandwidth is 130.77$$\%$$ % for the normal incidence. The accuracy is verified via measurements well matched with the simulations. The proposed metamaterial absorber could not only break though the conventional concept that the number of layers should be increased to extend the bandwidth but also provide a powerful solution to realize a low-profile, lightweight, and low cost electromagnetic absorber.

Miniaturized square fractal ring patch unit cell for active reflective metasurface in C‐ and X‐bands

“…To determine the dimensions of the proposed square fractal ring, GA is adopted, which is a stochastic optimizer mimicking the meiosis of the chromosome. [18][19][20] To this end, random bit arrays composed of 29 bits, that is, zero or one, are generated. The number of random bit arrays is the same as that of the array's bits.…”

“…The condition may guarantee sufficient diversity of the generated random bit arrays. 19,20 The 29 bits are composed of three bytes, including 8 bits each and a byte containing 5 bits. The former three bytes are matched with the geometric parameters of the square fractal ring l, h, and g, and the last one is matched with w. The bytes can be decoded into decimal numbers.…”

“…Optimal dimensions of the square fractal ring are determined via the genetic algorithm (GA). [18][19][20] The proposed design provides ∘ 180 phase differences of the reflection coefficients between on and off states of the PIN diode at both C-and X-bands center frequencies. The accuracy of the proposed dualband reflective metasurface unit cell is verified by comparing simulations with measurements inside the C-and X-bands rectangular waveguides.…”

Manufacturing of a Magnetic Composite Flexible Filament and Optimization of a 3D Printed Wideband Electromagnetic Multilayer Absorber in X-Ku Frequency Bands

“…Another paper by Pan et al [12] also achieved a three-layer Jaumann microwave absorber by controlling the thickness of graphene oxide laminated on Kapton film, which is then placed on various dielectric substrates (foams, flexible materials), resulting in a reflection of −10 dB, covering L, S, and C bands. Finally, Kim et al [13] have proposed a double-layer carbon metapattern using surface plasmon polaritons and coherent absorptions to achieve 90% of the absorption, from 6.3 to 30.1 GHz, with a total thickness of 4 mm. Besides, 3D printing technologies have also been investigated to realize EM absorbers using different absorbing designs.…”

Broadband Sound Insulation and Dual Equivalent Negative Properties of Acoustic Metamaterial with Distributed Piezoelectric Resonators

“…However, the actual focus began in 2000, when Smith [ 5 ] demonstrated a composite medium that exhibits a frequency region in the microwave regime with simultaneously negative values of effective permeability and permittivity. Since then, artificially constructed metamaterials have achieved unprecedented development in the fields of electromagnetics [ 6 , 7 , 8 ], optics [ 9 , 10 , 11 ], mechanics [ 12 , 13 , 14 ], and acoustics [ 15 , 16 , 17 ].…”