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A Far Infrared Broadband Periodic Absorbing Structure

A wide-band, periodic technology, applied to antennas, electrical components, etc., can solve the problems of narrow absorption frequency band and single frequency band

Active Publication Date: 2019-05-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, since this absorption effect is based on the electromagnetic resonance characteristics of the periodic perfect absorbing structure, the narrow absorption frequency band and single frequency band are its inherent shortcomings.

Method used

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  • A Far Infrared Broadband Periodic Absorbing Structure
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  • A Far Infrared Broadband Periodic Absorbing Structure

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Embodiment Construction

[0021] In the present invention, the wave-absorbing structure is designed on a substrate supported by Si, the bottom continuous metal film and metal layer are both Al, and the dielectric layer is Al 2 o 3 , a=6um, the diameter of the absorbing unit d=3.2um, the thickness of the first dielectric layer is 0.25um, the thickness of the second dielectric layer is 0.3um, the thickness of the metal layer is 0.1um, and the thickness of the underlying metal film is 200nm .

[0022] The parameters of reflectance and transmittance were obtained through the commercial electromagnetic simulation software CST Microwave Studio, and the absorption rate curve was calculated.

[0023] Use the center point of the circular patch as a reference. For a circular patch, the present invention uses its center-to-center distance as a reference for the row pitch and column pitch of the array. figure 1 (a) shows the average value range of each absorbing unit and the occupied bottom metal film and the f...

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Abstract

The invention belongs to the technical field of functional materials and devices, and in particular relates to a far-infrared broadband periodic wave-absorbing structure. The wave-absorbing structure of the invention includes a bottom metal thin film and a wave-absorbing unit array. The wave-absorbing unit array is as follows from the bottom to the top: the first dielectric layer and the circular patch array. The circular patch array is arranged horizontally and vertically equidistantly on the continuous first medium layer. From the bottom to the top, the circular patches are: the first metal layer, the second dielectric layer and the second metal layer. The material of the underlying metal film and the metal layer is Al, and the dielectric layer is Al 2 o 3 . The present invention adopts two sets of metal-dielectric interlayer structures, has a large emissivity in the 8-11um band, and has broadband characteristics, and the emissivity in the 8.7-9.96um band is greater than 80%. It is applied in the aerospace thermal control system to solve the problem of Satellite cooling problem.

Description

technical field [0001] The invention belongs to the technical field of functional materials and devices, and specifically relates to a far-infrared broadband periodic absorbing structure, which is applied to far-infrared emissivity modulation, atmospheric window material radiation characteristic control, spacecraft thermal control systems and other fields. Background technique [0002] Periodic perfect absorber is a new type of electromagnetic structural device derived from electromagnetic metamaterial in recent years. This wave-absorbing structure utilizes the resonant properties of metamaterials: the metal array unit will generate electrical resonance with the incident electric field, and the parallel currents will be induced between the two layers of metal up and down, resulting in magnetic resonance with the incident magnetic field, so that electromagnetic waves are effectively localized in the structural unit. According to the equivalent medium theory, its electromagne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00
CPCH01Q17/00
Inventor 周佩珩谢健翁小龙谢建良邓龙江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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