Single and multi-band microwave absorbers

An absorber and multi-band technology, which is applied in the direction of electrical components, magnetic field/electric field shielding, etc., can solve the problems of thick electromagnetic absorbing material, unsatisfactory absorption effect, and uncompact structure, and achieve perfect absorption effect and good absorption effect , the effect of compact structure

Active Publication Date: 2011-12-21
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional electromagnetic absorbing materials are thick and bulky, and are only suitable for a certain polarization of electromagnetic waves. The absorption effect is not ideal in the case of large-angle incidence, and they are subject to many constraints in practical applications; The layout is vertical or horizontal, and the structure is not compact

Method used

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  • Single and multi-band microwave absorbers
  • Single and multi-band microwave absorbers
  • Single and multi-band microwave absorbers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] see figure 1 , the single-band microwave absorber of the present invention includes a ring-shaped artificial electromagnetic material 1, a metal back plate 3 and a dielectric substrate 2 with adjustable thickness installed between the artificial electromagnetic material 1 and the metal back plate 3. Changing the perimeter of the artificial electromagnetic material 1 and the thickness of the dielectric substrate 2 can adjust the microwave absorption rate and absorption frequency band.

[0028] The shape of the artificial electromagnetic material 1 is a polygon or a circle that is symmetrical along the horizontal direction and the vertical direction, and is suitable for different polarizations.

[0029] see figure 2 , in this embodiment, the shape of the artificial electromagnetic material 1 is square.

[0030] When the electric field along figure 2 When excited in the direction shown, the electric field component in the incident electric field excites the dipole ele...

Embodiment 2

[0033] The multi-band microwave absorber of the present invention includes a plurality of ring-shaped artificial electromagnetic materials 1, a metal back plate 3 and a dielectric substrate 2 installed between the artificial electromagnetic material 1 and the metal back plate 3, and the plurality of artificial electromagnetic materials 1 are mutually Nested and concentrically installed, it has the advantages of compact structure and so on. By changing the number of artificial electromagnetic materials 1 and by adjusting the ratio of the inner and outer circumferences of the artificial electromagnetic materials 1, perfect absorption of multiple frequency bands within the designed frequency band can be realized.

[0034] The shape of the artificial electromagnetic material 1 is a polygon or a circle that is symmetrical along the horizontal direction and the vertical direction, and is suitable for large incident angles and different polarizations.

[0035] The multi-band microwav...

Embodiment 3

[0041] see figure 1 with Figure 4 , In Embodiment 2, the number of artificial electromagnetic materials 1 is three, the shape is square, and other contents are the same as in Embodiment 2.

[0042] see Figure 7 , due to the rotational symmetry of the square artificial electromagnetic material 1, there are similar theoretical and experimental results for the two polarized microwaves.

[0043] see Figure 9 with Figure 11 , the experimental results show that the absorption rate is 99.1%, 93% and 95% at 4.06GHz, 6.73GHz and 9.22GHz; the absorption rate is still above 90% when the incident angle reaches 50 degrees.

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Abstract

The invention discloses a single frequency band microwave absorber and a multiple frequency band microwave absorber, wherein the multiple frequency band microwave absorber comprises a plurality of annular artificial electromagnetic materials (1), a metallic back board (3) and a medium substrate (2) arranged between the metallic back board (3) and the annular artificial electromagnetic materials (1); the annular artificial electromagnetic materials (1) are mutually embedded and sleeved and are concentrically arranged; and the single frequency band microwave absorber comprises an annular artificial electromagnetic material (1), a metallic back board (3) and a thickness-adjustable medium substrate (2) arranged between the metallic back board (3) and the annular artificial electromagnetic material (1). The multiple frequency band microwave absorber disclosed by the invention has a perfect absorbing effect for large-angle oblique-incidence microwaves. In practical application, the electromagnetic environment is complicated and oblique-incidence waves are commoner than normal-incidence waves, thus the single frequency band microwave absorber and the multiple frequency band microwave absorber can excellently suit the complicated electromagnetic environment. The annular artificial electromagnetic materials (1) adopted by the single frequency band microwave absorber and the multiple frequency band microwave absorber are single-layer, so that the single frequency band microwave absorber and the multiple frequency band microwave absorber have thin thickness and light weight and are easy to conform.

Description

technical field [0001] The invention relates to a microwave absorber, in particular to a single- and multi-band microwave absorber, which can be used in the fields of radar stealth, radar imaging, radiometer and the like. Background technique [0002] Traditional electromagnetic absorbing materials are thick and bulky, and are only suitable for a certain polarization of electromagnetic waves. The absorption effect is not ideal in the case of large-angle incidence, and they are subject to many constraints in practical applications; The arrangement is vertical or horizontal, and the structure is not compact. [0003] Artificial electromagnetic materials (Metamaterials) are electromagnetic materials that can be artificially designed to meet specific requirements for equivalent permittivity and permeability. The artificial electromagnetic material is based on the equivalent medium theory, that is, the equivalent permittivity and permeability can be changed by changing the perim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
Inventor 崔铁军沈晓鹏
Owner SOUTHEAST UNIV
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