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.
Highlights
Electromagnetic (EM) metamaterials (MMs), as artificial periodic sub-wavelength structured composite materials, have attracted great attention since they can achieve exotic EM or light properties unavailable in nature [1]
We firstly present a triple-band polarization-insensitive metamaterial absorber (MMA) formed by only a single circular sector resonant (CSR) structure and a ground-plane separated by a dielectric layer based on the multiple-order responses
The absorption properties of multi-band MMAs using a single circular sector resonator structure based on the combination of fundamental and higher-order magnetic resonance
Summary
Electromagnetic (EM) metamaterials (MMs), as artificial periodic sub-wavelength structured composite materials, have attracted great attention since they can achieve exotic EM or light properties unavailable in nature [1]. One of the important applications is to design perfect metamaterial absorbers (MMAs), which can achieve near unity absorption by adjusting the geometric parameters of the MM’s unit-cell structure [5,6]. Four-band and five-band MMAs are proposed and demonstrated numerically based on multiple-order responses, by selecting the appropriate geometric parameters of the unit-cell structure. In the design of a triple-band MMA, the FR-4(loss) with permittivity of εr = 4.3 × (1 + i0.025) and thickness of 0.8 mm was selected as the middle dielectric substrate, and the continuous copper film with frequency-independent conductivity of σ = 5.8 × 107 S/m and thickness of 35 μm were selected as metallic layers. The absorbance reference measurement eliminate near-fieldwavelength, effect, the distance between antennas and MMA sample was To far larger thanthe operational which was.
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