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Method for realizing high-efficiency electromagnetic absorption by using transmitted wave/evanescent wave conversion mechanism

A technology for transmitting waves and mechanisms, applied in electrical components, magnetic field/electric field shielding, etc., it can solve the problems that the relationship between parameters and structures cannot be given, the equivalent medium theory is not completely practical, and the numerical simulation optimization is limited, so as to save design. Cost, wide application spectrum, time saving effect

Active Publication Date: 2011-08-10
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the design of high-efficiency electromagnetic absorption, it is still limited to numerical simulation optimization
In terms of theory, although the mechanism of absorption can be explained to a certain extent by using the equivalent medium theory, the theory cannot guide the design
First of all, the equivalent medium theory is not completely practical in this case, because the subwavelength artificial structure is not periodic in the direction of electromagnetic wave propagation, and the homogeneous medium approximation cannot be used at this time
Secondly, the traditional equivalent medium theory cannot give the relationship between parameters and structure

Method used

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  • Method for realizing high-efficiency electromagnetic absorption by using transmitted wave/evanescent wave conversion mechanism
  • Method for realizing high-efficiency electromagnetic absorption by using transmitted wave/evanescent wave conversion mechanism
  • Method for realizing high-efficiency electromagnetic absorption by using transmitted wave/evanescent wave conversion mechanism

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Embodiment 1

[0034] Such as figure 1 As shown, the specific steps of Embodiment 1 of the present invention are as follows:

[0035] (1) Determine the absorption frequency as 100THz;

[0036] (2) Choose copper as figure 2 The material of the metal reflective surface indicated by the number 3 in the above figure (side view), the thickness t of copper is much greater than the penetration depth, and t is selected as 100nm.

[0037] (3) Select Al 2 o 3 as figure 2 The material of the medium indicated by the number 2 in the above figure (side view), Al 2 o 3 The dielectric constant is 2.92, and the initial value of thickness d is 60nm, which is much smaller than the wavelength.

[0038] (4) Select the square copper patch as figure 2 The metal structure indicated by the number 1 in the above picture (side view) is made of metallic copper; figure 2 The figure below shows a top view of the structure, in figure 2 In the figure below, the period P is 800nm, the side length L of the cop...

Embodiment 2

[0044] The concrete steps of embodiment 2 of the present invention are as follows:

[0045] (1) Determine the absorption frequency to be 9.5GHz;

[0046] (2) Choose copper as figure 2 The material of the metal indicated by the number 3 in the above picture (side view), the thickness of metal copper is 0.017mm;

[0047] (3) Select FR-4 medium board as figure 2 The material of the medium indicated by the number 2 in the above figure (side view), the dielectric constant of the FR-4 dielectric plate in this frequency band is 4+0.1i, and the initial value of the thickness d is 0.5mm;

[0048] (4) Select the square copper patch as figure 2 The metal structure indicated by the number 1 in the above picture (side view) is made of metallic copper; figure 2The figure below shows a top view of the structure, in figure 2 In the figure below, the period P is 10mm; the side length L of the copper patch is 7mm, and the thickness t is 0.017mm.

[0049] (5) adopt the same steps as i...

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Abstract

The invention discloses a method for realizing high-efficiency electromagnetic absorption by using a transmitted wave / evanescent wave conversion mechanism. The method comprises the following steps of: selecting a frequency f0; selecting a metal structure; selecting size parameters of the metal structure; selecting a medium layer and the thickness d thereof; selecting the thickness of a metal substrate; after the parameters are determined, performing electromagnetic simulation on the structure, simulating a reflectivity S11, putting forward an equivalent impedance obtained by formula inversion, comparing the equivalent impedance with an ideal absorption impedance, and further changing the parameters to realize high-efficiency electromagnetic absorption at the frequency point f0. The invention provides a rapid and accurate method for designing a high-efficiency electromagnetic absorption material; and the method has wide application prospect in the fields of solar energy, biosensing, radiation detection and the like.

Description

technical field [0001] The invention belongs to the field of artificial electromagnetic materials, and relates to a method for realizing high-efficiency electromagnetic absorption by using a transmission wave and evanescent wave conversion mechanism. technical background [0002] Artificial electromagnetic materials have artificially adjustable electromagnetic properties and can realize many exotic electromagnetic devices. Through the conversion of transmitted waves to evanescent waves, the material can be used to achieve high-efficiency electromagnetic absorption (absorption rate greater than 90%), which is of great value in the fields of solar cells, biosensing, and radiation detection. However, for the design of high-efficiency electromagnetic absorption, it is still limited to numerical simulation optimization. In terms of theory, although the mechanism of absorption can be explained to a certain extent by using the equivalent medium theory, the theory cannot guide the ...

Claims

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Application Information

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IPC IPC(8): H05K9/00
Inventor 蒲明博罗先刚胡承刚王民
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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