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Negative magnetoconductivity material with suitable thickness ring structure

A negative magnetic permeability material and appropriate technology can be used in waveguide-type devices, optics, instruments, etc., and can solve the problems of not being able to generate magnetic resonance and not considering the effect of ring thickness resonance.

Inactive Publication Date: 2009-09-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The initial research on materials with negative magnetic permeability includes transmission, reflection and other properties, which require that the wave vector direction of the electromagnetic wave is parallel to the plane where the resonant ring is located, and the magnetic field is perpendicular to the ring surface to achieve magnetic resonance with negative magnetic permeability; and it is considered that when The wave vector of the electromagnetic wave is perpendicular to the torus, that is, when the magnetic field has no component perpendicular to the torus, it cannot generate magnetic resonance to achieve negative magnetic permeability
[0004] However, the establishment of the above theoretical model does not consider the effect of the ring thickness on the resonance

Method used

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  • Negative magnetoconductivity material with suitable thickness ring structure
  • Negative magnetoconductivity material with suitable thickness ring structure
  • Negative magnetoconductivity material with suitable thickness ring structure

Examples

Experimental program
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Effect test

Embodiment 1

[0014] A metal copper closed ring with appropriate thickness is prepared by mechanical finishing method, and its structural parameters are: inner diameter D 1 8.0mm~32.0mm, outer diameter D 2 It is 10.0mm~35.0mm, and the thickness d is 1.0mm. It is fixed on the epoxy phenolic glass fiber medium substrate. The copper rings with the same geometric parameters are arranged in a layered structure according to a certain lattice periodic structure. The plane where the rings are located is parallel to The direction of the magnetic field is perpendicular to the direction of the wave vector, that is, a negative magnetic permeability material with an appropriate thickness ring structure is produced, and its resonance frequency is 900MHz-12000MHz.

Embodiment 2

[0016] A metal copper closed ring with appropriate thickness is prepared by mechanical finishing method, and its structural parameters are: inner and outer diameter D 1 / D 2 (unit: mm) take the values ​​of 6 / 8, 4 / 6, 3.5 / 5, 2.5 / 4, 1.5 / 3, and the thickness d is 1.0mm, and fix it on the epoxy phenolic glass fiber medium substrate. The same geometric parameters The copper rings are arranged into a layered structure according to a certain lattice periodic structure. The plane of the rings is parallel to the direction of the magnetic field and perpendicular to the direction of the wave vector, that is, a negative magnetic permeability material with a ring structure of appropriate thickness (as shown in the attached figure 2 shown). The measured resonant frequencies are 14.5GHz, 15.2GHz, 16.7GHz, and 17.5GHz, respectively.

Embodiment 3

[0018] A metal copper split ring with appropriate thickness is prepared by mechanical finishing method, and its structural parameters are: inner diameter D 1 =2.5mm, outer diameter D 2 = 4.0mm, opening g = 0.1mm ~ 1.0mm, fix it on the epoxy phenolic glass fiber medium substrate, and arrange the copper rings with the same thickness d into a layered structure according to the interval of 5mm, that is, the ring structure with a certain thickness is obtained materials with negative magnetic permeability. Place it in the waveguide so that the plane of the ring is parallel to the direction of the magnetic field, that is, perpendicular to the direction of the wave vector, and measure the electromagnetic response behavior of the material. The results show that opening the ring can increase the resonant frequency of the material, and the adjustment range is 200MHz.

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Abstract

The invention relates to a negative magnetic permeability material, in particular to a negative magnetic permeability material with an appropriate thickness ring structure. Compared with previous materials, the metal ring in the negative magnetic permeability material of the present invention has an appropriate thickness, and its plane is parallel to the direction of the magnetic field, that is, perpendicular to the wave vector direction. The material can generate magnetic resonance to realize negative magnetic permeability. By adjusting the inner and outer diameters, thicknesses and openings of the unit rings, a negative magnetic permeability material in the microwave segment with adjustable strength in the range of -23.33dB to -4.19dB within the resonant frequency of 900MHz to 17500MHz can be prepared.

Description

technical field [0001] The invention relates to a negative magnetic permeability material, in particular to a negative magnetic permeability material with a suitable thickness ring structure along the wave vector direction. Background technique [0002] Negative magnetic permeability material is an artificial composite structure material that does not exist in nature. By adjusting the geometric shape and spatial pattern distribution in its resonant unit, a material with a magnetic permeability less than zero can be obtained. A novel material—left-handed material—can be produced by compounding the negative magnetic permeability material and the negative dielectric constant material. In this material, the phase velocity and group velocity of electromagnetic waves are in opposite directions, thus presenting many peculiar optical properties, such as anomalous Doppler effect, anomalous Cherenkov effect, perfect lens effect, negative refraction effect, etc. Therefore, it has impo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/00H01P7/00G02F1/355
Inventor 赵晓鹏宋娟刘亚红
Owner NORTHWESTERN POLYTECHNICAL UNIV
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