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Non-reciprocal wave-absorbing material and manufacturing method thereof

A wave absorbing material, a non-reciprocal technology, applied in the field of wave absorbing materials, can solve the problems affecting the stealth performance of the wave absorbing material, generate reflected waves, etc., and achieve the effect of efficient wave absorption and suppression of reflected wave transmission

Inactive Publication Date: 2020-07-31
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on the problems existing in the prior art, the purpose of the present invention is to provide a non-reciprocal wave-absorbing material and its manufacturing method, which can solve the problem of reflected waves generated by the bidirectional transmission of electromagnetic wave energy inside the existing reciprocal wave-absorbing material, which affects the absorption. The problem of stealth performance of wave materials

Method used

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  • Non-reciprocal wave-absorbing material and manufacturing method thereof
  • Non-reciprocal wave-absorbing material and manufacturing method thereof
  • Non-reciprocal wave-absorbing material and manufacturing method thereof

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Embodiment 1

[0058] In this embodiment, the wave-absorbing material based on the principle of time-reversal symmetry breaking is a periodic structure, continuous along the electric field direction of the incident electromagnetic wave, and periodically distributed along the magnetic field direction of the incident electromagnetic wave, see figure 2 , the absorbing material is a plate-shaped structure, which is composed of a filled dielectric plate 1, a metal back plate 2 and multiple groups of absorbing units; the bottom surface of the filled dielectric plate 1 is attached with a metal back plate 2, and the metal back plate 2 will fill The bottom surface is completely covered; multiple groups of wave-absorbing units are embedded and fixed in the filled medium plate at intervals in parallel, and each group of wave-absorbing units includes a long strip-shaped gyromagnetic ferrite column 3, and the long strip-shaped gyromagnetic ferrite column 3 A metal strip 4 is closely attached to the surfa...

Embodiment 2

[0090] Since the unidirectional transmission working frequency band on the surface of the gyromagnetic ferrite is determined by the magnitude of the external bias magnetic field and the saturation magnetization of the gyromagnetic ferrite itself, the absorption characteristics of the absorbing material based on the principle of time-reversal symmetry breaking come from the structure Therefore, by choosing these two parameters reasonably, the designed absorbing material can work in the target frequency band.

[0091] The non-reciprocal absorbing material based on the principle of time-reversal symmetry breaking in this embodiment is realized by properly adjusting the structure and changing the parameters of the corresponding material on the basis of the structure of the absorbing material in Example 1. The working frequency band is P band. Such as Figure 10 The basic structure and Figure 11 As shown in the side view of the wave-absorbing material, the basic structure and co...

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Abstract

The invention discloses a non-reciprocal wave-absorbing material and a manufacturing method thereof. The wave-absorbing material is a plate-shaped structure body, and the method comprises the steps that a metal back plate is pasted on the bottom surface of a filling dielectric plate; each group of wave absorbing units are embedded into the filling dielectric plate in parallel at intervals; and each wave absorbing unit comprises a long-strip-shaped gyromagnetic ferrite column, a metal strip is attached to the surface of one side of each long-strip-shaped gyromagnetic ferrite column, the lengthof each metal strip is equal to that of the corresponding long-strip-shaped gyromagnetic ferrite column, and the width of each metal strip is smaller than the height of the side surface of the corresponding long-strip-shaped gyromagnetic ferrite column. A bias magnetic field applying assembly is embedded outside the wave absorbing units in the filling dielectric plate and can apply a bias magneticfield to the wave absorbing units, wherein the direction of the bias magnetic field is parallel to the electric field direction of incident waves. According to the wave-absorbing material with the structure, the time reversal symmetry of each strip-shaped gyromagnetic ferrite column can be broken by utilizing an external bias magnetic field, so that the non-reciprocal electromagnetic property isgenerated, and the transmission of reflected waves in the material can be effectively inhibited.

Description

technical field [0001] The invention relates to the field of wave-absorbing materials, in particular to a non-reciprocal wave-absorbing material and a manufacturing method thereof. Background technique [0002] Absorbing materials refer to electromagnetic materials or electromagnetic structures that can absorb, lose, and attenuate electromagnetic waves in the microwave frequency band. Absorbing materials have very important applications in stealth, anti-electromagnetic interference and electromagnetic shielding. [0003] The absorbing material converts the energy of the electromagnetic wave into heat energy loss by interacting with the electromagnetic wave. The absorption performance of the absorbing material for electromagnetic waves depends not only on whether the material itself has a suitable electromagnetic loss, but also on whether the electromagnetic wave can smoothly enter the absorbing material from the free space. Therefore, a good absorbing material must meet th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00H05K9/00
CPCH01Q17/007H05K9/0081
Inventor 朱旗
Owner UNIV OF SCI & TECH OF CHINA