Graphene ultra-broadband absorber based on local aperiodic structure
A technology of graphene and wave absorbers, which is applied in the field of ultra-broadband wave absorbers with local non-periodic structures, can solve the problems of narrow absorption bandwidth and sensitivity, and achieve strong practical effects
Active Publication Date: 2018-07-17
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER +1
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[0008] In the design of graphene absorbers, the multi-layer absorbing structure can expand the absorbing bandwidth, for example, in 2013 Muhammad Amin [Muhammad Amin; Mohamed Farhat; Hakan An ultra-broadband multilayered graphene absorber [J]. Optics Express, 2013, No.24] proposed the design of applying graphene to a multilayer absorber, and designed a absorber structure at low THz broadband, but The asymmetric structure of the surface absorbing layer makes it sensitive to the polarization incident angle in a wide frequency band, and the relative absorbing bandwidth of the absorption rate above 90% is also narrow. Only 41.8%, 73.4%, 85% respectively
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[0040] Single-layer graphene absorbers based on locally aperiodic structures such as figure 1 , the side length of the graphene sheet 5 in the top graphene layer is greater than 1% to 7% of the half-wavelength of the center frequency of the absorption bandwidth. In the design of the absorber, the thickness of 10 and 11 is usually within 10um, accounting for about 1% to 2% of the overall structure thickness. The thickness of the dielectric layer 12 is a quarter wavelength of the central frequency of the absorption bandwidth. The bottom plate 13 is an ideal metal plate, and its thickness takes any value other than zero in the design of the wave absorber. According to basic knowledge 2, the absorption rate is determined by the reflection coefficient of the overall structure of the absorber. Specific examples are as follows:
[0041] The side length d of the graphene layer 5 on the top of the single-layer absorber is 1.5mm, the distance between the graphene sheets is g=0.6mm, a...
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Abstract
A graphene ultra-broadband wave absorber based on a local non-periodic structure, including a metal plate layer, at least one wave absorbing layer is arranged on the metal plate layer, and the wave absorbing layer is sequentially provided with a dielectric layer, a silicon layer, The insulating dielectric layer and the graphene layer, the silicon layer, the insulating dielectric layer and the graphene layer constitute the bias layer, wherein the graphene layer and the silicon layer are respectively connected to the positive and negative electrodes of the external bias voltage, and the graphene layer is composed of several graphene basic The units are arranged in two dimensions. The invention has strong practicability and is widely used in microwave bands and low THz bands. Because of its simple structure, it is easy to realize in the processing technology. By adjusting the impedance value of the graphene layer and the application of non-periodic structures, the absorber can obtain ultra-broadband absorbing and show characteristics of insensitivity to polarization. Introducing a multi-layer non-periodic graphene structure, and then loading an appropriate bias voltage on each layer, so that the absorber can obtain a wider absorbing bandwidth than that based on a single-layer, periodic structure.
Description
technical field [0001] The invention relates to the field of electromagnetic wave absorbers, in particular to a graphene-based ultra-broadband wave absorber with a local aperiodic structure. The absorber can realize ultra-bandwidth absorbing, and shows the characteristics of insensitivity to polarization, which can be used for stealth of aircraft and other targets, near-field testing of electromagnetic characteristics, etc. Background technique [0002] With the development and progress of electronic science and technology, especially the development of military technology, radar has all-weather, anti-interference and long-range detection capabilities, which poses a serious challenge to the survivability and penetration capabilities of aircraft. Therefore, improving the stealth performance of the aircraft has important practical significance for improving the comprehensive combat effectiveness of the aircraft. [0003] At present, the methods of radar stealth technology can...
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IPC IPC(8): H01Q17/00
CPCH01Q17/00
Inventor朱四新姜彦南高超宁王娇
OwnerNORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER