Flexible terahertz wave absorber
A technology of terahertz and wave absorber, applied in the field of terahertz, can solve the problems of thick thickness of laminated terahertz wave absorber, difficult processing of laminated structure, low practical application value, etc. Low, wide range of effects
Pending Publication Date: 2022-03-11
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology
The design of broadband terahertz absorbers generally adopts the structure of multi-layer metal and dielectric stacked alternately, which reduces the Q value in the vertical direction and introduces multi-resonance absorbing units at the same time, so that the effective absorbing bandwidth exceeds 100%. There are great processing difficulties in the Hertz frequency band, and there is a lack of suitable technology at this stage, so it is difficult to be practically applied
On the other hand, compared with single-layer terahertz absorbers, laminated terahertz absorbers are thicker, which is not conducive to conformality, and their practical application value is relatively low
Method used
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[0026] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0027] The present invention proposes a broadband terahertz absorbing structure based on a four-unit subarray, including a four-unit subarray structure, such as Image 6 As shown; the four-unit sub-array structure includes four dual-frequency absorbing units with different scale factors, that is, four dual-frequency absorbing units with different scale factors form a sub-array of the four-unit sub-array structure.
[0028] The structure of the dual-frequency absorbing unit is as follows: Figure 4 As shown, the dual-frequency absorbing unit adopts a three-layer structure, the top layer is a metal pattern, and the material is 200nm gold or low-loss metal. It consists of an I-shaped resonant unit 1 and an open square ring resonant unit 2. The I-shaped resonant unit 1 is located at Open square ring resonant unit 2 inside. The middle layer is a fl...
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The invention discloses a flexible terahertz wave absorber, and belongs to the technical field of terahertz. According to the invention, the slotted square ring is combined with the I-shaped wave-absorbing unit structure, so that two wave-absorbing frequency bands which can be tuned independently are generated; a four-unit subarray structure based on combination of slotted square rings and I-shaped wave-absorbing units is provided, four wave-absorbing units with different scale factors form a subarray, and a periodic structure based on the subarray has a broadband wave-absorbing characteristic; the broadband terahertz wave-absorbing structure provided by the invention adopts the single-layer dielectric film, and the metal pattern is etched on the single side of the film, so that the broadband terahertz wave-absorbing structure has the advantages of wide wave-absorbing bandwidth, high wave-absorbing rate and thin wave-absorbing body thickness; compared with an existing single-layer dielectric substrate wave-absorbing structure, the wave-absorbing bandwidth is greatly expanded, and the application range is wider; compared with a broadband wave absorber based on a multi-layer medium, the broadband wave absorber has the advantages that the processing difficulty is greatly reduced, the broadband wave absorber can be processed by adopting a conventional process, the cost is low, the thickness is small, and conformal use with a terahertz device is easy.
Description
technical field [0001] The invention belongs to the technical field of terahertz, and in particular relates to a flexible terahertz absorber. Background technique [0002] Terahertz absorbing materials are widely used in terahertz radar, terahertz imaging, and high-sensitivity terahertz detectors. Absorbing materials are mainly divided into four types: split-tip foam absorbing materials, solid hard plastic absorbing materials, magnetic planar absorbing materials, and supersurface absorbing materials. The terahertz absorbing materials available in the market generally use metal oxides, polyurethane foams, carbon fibers, etc., and use the absorbing properties of the materials themselves and the wedge structure to achieve high absorption of electromagnetic waves. However, there are difficulties in preparation in the terahertz frequency band. Problems with large volume are difficult to apply widely. The new wave-absorbing material based on artificial electromagnetic metasurfac...
Claims
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Login to View More IPC IPC(8): H01Q17/00
CPCH01Q17/00
Inventor杨耀辉杨锦鹏张亭朱军锋
OwnerTHE 41ST INST OF CHINA ELECTRONICS TECH GRP