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A microwave absorber based on double-layer magnetic medium to realize widening of low-frequency bandwidth

A wave absorber and magnetic medium technology, applied in the field of metamaterial wave absorber design, can solve the problems of large thickness and unit size, difficulty in absorbing waves, etc., and achieve the effect of small unit size

Active Publication Date: 2020-07-31
SOUTHEAST UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] But at this stage, most of the absorbers work in the X-band, and there are few researches on the low-frequency absorbers in the L-band. Although the absorbers in the high-frequency band can be scaled to the low-frequency band by proportional scaling, the thickness and unit The size is very large
Under the premise that the L frequency band and the thickness of the absorbing plate do not exceed 2mm, it is difficult to achieve a wider frequency band absorbing

Method used

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  • A microwave absorber based on double-layer magnetic medium to realize widening of low-frequency bandwidth
  • A microwave absorber based on double-layer magnetic medium to realize widening of low-frequency bandwidth
  • A microwave absorber based on double-layer magnetic medium to realize widening of low-frequency bandwidth

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Embodiment 1

[0034] A absorber based on a double-layer magnetic medium to achieve bandwidth expansion in the low frequency band, such as figure 1 shown. The periodic metal structure on the upper surface of the two-layer dielectric substrate is as follows: Figure 6 As shown, the size of the absorber unit is 10mm*10mm, the thickness of the lower dielectric substrate is 0.6mm, the side length of the outer circle of the square ring on the surface of the lower dielectric substrate is 6.5mm, and the side length of the inner circle of the square ring is 0.6mm; the upper dielectric substrate The thickness of the square ring is 1.4mm, the side length of the outer circle of the square ring on the surface of the upper dielectric substrate is 7.6mm, and the side length of the inner circle of the square ring is 1.5mm.

[0035] In this example, the double-layer magnetic medium realizes the low-frequency bandwidth widening absorber, which is modeled and simulated in the electromagnetic simulation softw...

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Abstract

The invention provides a wave-absorbing device for realizing low frequency band bandwidth broadening based on double layers of magnetic mediums. The wave-absorbing device comprises a dielectric substrate (1), a metal plate (2) close to the lower surface of the dielectric substrate (1), a periodic surface metal pattern (3) on the upper surface of the dielectric substrate (1), a dielectric substrate (4) on the periodic surface metal pattern, and a periodic surface metal pattern (5) on the upper surface of the dielectric substrate (4). According to the wave-absorbing device, two different magnetic mediums with periodic metal patterns on the surfaces are employed, the two magnetic mediums are longitudinally stacked together, and a problem of a narrow L frequency band wave-absorbing bandwidth is solved.

Description

technical field [0001] The invention relates to a wave absorber with a double-layer magnetic medium to widen the bandwidth of a low-frequency band, and belongs to the technical field of metamaterial wave absorber design. Background technique [0002] Microwave absorber, as the name suggests, is a functional material that can effectively absorb electromagnetic waves. In 2008, Landy et al. prepared a microwave absorber with a microwave absorption performance close to 100% based on the electromagnetic resonance characteristics of metamaterials, but the frequency band is very narrow. After that, absorbers developed rapidly. With the deepening of research, various metamaterial absorbers with stable polarization, wide incident angle, broadband and multi-band have been proposed one after another, and have been applied in human body protection, information security, Target stealth and antenna radar cross section reduction design, etc. [0003] But at this stage, most of the absorbe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00
CPCH01Q17/008
Inventor 叶璐窦文斌
Owner SOUTHEAST UNIV
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