Abstract
In this paper, a broadband metamaterial microwave absorber is designed, simulated and measured. Differently from the traditional method which is only based on unit cell boundary conditions, we carried out full-wave finite integration simulations using full-sized configurations. Starting from an elementary unit cell structure, four kinds of coding metamaterial blocks, 2 × 2, 3 × 3, 4 × 4 and 6 × 6 blocks were optimized and then used as building blocks (meta-block) for the construction of numerous 12 × 12 topologies with a realistic size scale. We found the broadband absorption response in the frequency range 16 GHz to 33 GHz, in good agreement with the equivalent medium theory prediction and experimental observation. Considering various applications of metamaterials or metamaterial absorbers in the electromagnetic wave processing, including the radars or satellite communications, requires the frequency in the range up to 40 GHz. Our study could be useful to guide experimental work. Furthermore, compared to the straightforward approach that represents the metamaterials configurations as 12 × 12 matrices of random binary bits (0 and 1), our new approach achieves significant gains in the broadband absorption. Our method also may be applied to the full-sized structures with arbitrary dimensions, and thus provide a useful tool in the design of metamaterials with specific desired frequency ranges.
Highlights
In this paper, a broadband metamaterial microwave absorber is designed, simulated and measured
The MB3 × 3-based full-sized structures show that there exists an optimal configuration with a superior result with the average absorptivity in the frequency range of [16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33] GHz is over 90% and the maximal absorption reaches 98%, this full-sized configuration is assigned as CFM3 × 3–1 and is illustrated in the inset of Fig. 4(b)
This report presents a new study on broadband metamaterial absorber based on defect optimization coding of the full-sized metamaterial structure
Summary
A broadband metamaterial microwave absorber is designed, simulated and measured. Almost four decades later, based on experimental evidence, the importance and applicability of metamaterial have been confirmed[3,4] This material has a variety of electromagnetic and optical properties different from ordinary materials, leading to many special applications such as super-lens, cloaking, wireless power transfer, high-performance antenna systems[1,4,5], and most recently the electromagnetic perfect absorber that the energy of the incident wave is mostly absorbed[2,6,7]. For the calculation of the absorption, 200 samples are used in each approach, we obtain the optimal configuration with a broadband up to 17 GHz, the results theoretically analyzed and experimentally confirmed This approach is expected opening up a new way to study and design broadband or multiband absorber metamaterial. This method promises to fit very well with studies of the actual size structure, which requiring pre-analysis of electromagnetic response via simulation
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