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Design method of impedance matching type metamaterial

A technology of impedance matching and design method, applied in the direction of electrical components, antennas, etc., can solve the problems of insufficient flexibility and achieve the effect of improving design flexibility

Active Publication Date: 2020-08-25
NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the invention is to solve the technical problem of insufficient flexibility in the on-demand design of the current broadband absorbing metamaterial structure

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  • Design method of impedance matching type metamaterial
  • Design method of impedance matching type metamaterial
  • Design method of impedance matching type metamaterial

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Embodiment 1

[0084] Taking the design of an impedance-matched broadband absorbing metamaterial with an absorption frequency range of 8-18 GHz as an example, refer to figure 1 design process and figure 2 , image 3 design of metamaterial structures. The thickness of the bottom copper plate is 0.1mm, the initial dielectric constant of the intermediate dielectric layer material is 1.33, and the loss tangent is 0.01. According to the design steps of the present invention,

[0085] S1, according to the requirements of the metamaterial absorbing frequency band 8-18GHz and the dielectric constant ε of the initial dielectric layer material s , the center frequency is 13GHz, and the calculated thickness t is 5mm.

[0086] S2, judging that the thickness t of the dielectric layer material is within a reasonable range of 2.06<t<5.77.

[0087] S3, according to the impedance matching condition, calculate the equivalent lumped resistance (R) of the square ring periodic structure on the surface of th...

Embodiment 2

[0094] Taking the design of an impedance matching broadband absorbing metamaterial with an absorption frequency band of 4-12 GHz as an example, the structure of the metamaterial is as follows: figure 2 , image 3 As shown, including the bottom copper plate, the intermediate dielectric substrate and the surface layer with a periodic configuration of the variable square resistance film layer, the thickness of the bottom copper and the surface layer of the square ring are both 0.1mm. The initial dielectric constant of the intermediate dielectric layer material is 1.69, and the loss tangent is 0.001. According to the design steps of the present invention,

[0095] S1, according to the requirements of the metamaterial absorbing frequency band 4-12GHz and the dielectric constant ε of the initial dielectric layer material s , the center frequency is 8GHz, and the calculated thickness t is 7.2mm.

[0096] S2, judging that the thickness t of the dielectric layer material is within a...

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Abstract

The invention belongs to the technical field of electromagnetic functional materials. The invention provides a design method of an impedance matching type metamaterial. According to specific wave absorbing frequency band requirements, metamaterial structure parameters are designed based on the impedance matching principle. According to the method, a frequency symmetry design method is adopted; theresonant frequency of a dielectric layer material is used as the central frequency position of the metamaterial absorption frequency; the equivalent lumped resistance, the equivalent inductance and the equivalent capacitance of the metamaterial surface layer structure at the cut-off frequency are calculated; the surface impedance of the metamaterial and the electromagnetic absorptivity in the target frequency band are obtained, the efficient absorption in the target frequency band is achieved by changing the square resistance value of a square ring, and the period, the length and the line width of a square ring unit are calculated and determined according to the equivalent inductance and the equivalent capacitance value of the metamaterial. The design method disclosed by the invention hasthe characteristics of simplicity, good broadband absorption effect and high practical application feasibility, and has wide application in the fields of microwave broadband stealth skins, wave-absorbing devices and the like.

Description

technical field [0001] The invention relates to the technical field of electromagnetic functional materials, in particular to a design method of impedance matching metamaterials. Background technique [0002] The technology of absorbing materials has gradually become an important technical way to improve the radar stealth performance of contemporary weapons and equipment, and is the key to the survival and penetration of aircraft and other weapons. The prerequisite for absorbing materials to achieve high-efficiency electromagnetic wave sound absorption is that the surface impedance of the material must match the wave impedance of free space, so that electromagnetic waves enter the interior of the material as much as possible, and then use the loss properties of the material itself to convert electromagnetic waves into heat energy and other forms of consumption. scattered. For traditional radar wave absorbing materials, the main way to achieve broadband impedance matching an...

Claims

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Application Information

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IPC IPC(8): H01Q15/00H01Q17/00
CPCH01Q15/0086H01Q17/008
Inventor 沈同圣邹春荣郭少军周晓松黎松
Owner NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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