CN101540207A - Slab wave-absorbing material - Google Patents

Abstract

Translated fromChinese

本发明属于电子信息技术领域，涉及电磁场与波，具体涉及平板式吸波材料。包括周期性排列的单元吸波结构，每个单元吸波结构包括介质基板、介质基板的正面金属结构和背面金属结构。正面金属结构由2～4条相互交叉的第一金属分支线构成，第一金属分支线两端具有与之垂直相连(或相切连接)的“直线(或圆弧)形”第二金属分支线。背面金属结构由2～4条相互交叉的第一金属分支线构成，第一金属分支线两端均与一“圆环形”第二金属分支线相切连接。相对于现有的平板式吸波材料，本发明可以吸收任意极化方向的电磁波；可以在更宽电磁场入射角度内进行更优吸收；且电磁谐振结构相互独立，可分别进行调节，具有调谐方便的特点。

The invention belongs to the technical field of electronic information, relates to electromagnetic fields and waves, and in particular to flat-plate wave-absorbing materials. It includes periodically arranged unit absorbing structures, and each unit absorbing structure includes a dielectric substrate, a front metal structure and a back metal structure of the dielectric substrate. The front metal structure is composed of 2 to 4 first metal branch lines intersecting each other, and the two ends of the first metal branch line have a "straight line (or arc) shape" second metal branch line vertically connected (or tangentially connected) to it. feeder. The metal structure on the back is composed of 2 to 4 first metal branch lines intersecting each other, and both ends of the first metal branch line are tangentially connected with a "ring-shaped" second metal branch line. Compared with the existing flat wave-absorbing materials, the present invention can absorb electromagnetic waves in any polarization direction; it can perform better absorption within a wider electromagnetic field incident angle; and the electromagnetic resonance structures are independent of each other and can be adjusted separately, which is convenient for tuning specialty.

Description

A kind of slab wave-absorbing material

Technical field

The invention belongs to electronic information technical field, relate to electromagnetic field and ripple, be specifically related to slab wave-absorbing material.

Background technology

Absorbing material commonly used at present has ferrite, barium titanate, metal fine powder, graphite, silit, conductive fiber etc.Ferrite wave-absorbing material is an absorbing material of studying more and comparative maturity, because higher magnetic permeability is arranged under high frequency, and also resistivity is also bigger, and electromagnetic wave is easy to enter and decay fast, is widely used in the radar absorbing field.Also there is certain defective in the absorbing material that with the ferrite is absorbing agent, poor as hot properties, surface density is bigger, various absorbing materials only can accomplish just under the situation of matching thickness that to matching frequency no reflection events absorbs, electromagnetic parameter coupling difficulty, absorbing property improves and absorption band is expanded problems such as limited.

Along with improving constantly of information system requirement, novel wave-absorbing material continues to bring out in recent years, mainly contains nano material, chiral material, conduction high polymer, reaches structural wave-absorbing material etc., and they all have the wave-absorbing mechanism that is different from traditional absorbing material.Novel flat absorbing material provided by the present invention utilizes the periodic structure simulation to realize having the artificial material of electromagnetic wave absorption function just, is convenient to realize the adjusting of material dielectric constant and magnetic permeability by this simulation, thereby realizes electromagnetic efficient absorption.

The conception of novel flat absorbing material stems from people such as professor Smith of in May, 2008 Duke University and Landy at PHYSICAL REVIEW LETTERS, the perfect absorbent structure of delivering on the PRL 100,207402 (2008).This structure is flat absorbent structure (as shown in Figure 1), its cellular construction front is two electric resonance structures that the split ring that links to each other dorsad constitutes, the back side is the rectangle sheet metal, carry out resonance and reach absorption function by making electromagnetic wave be trapped in inside configuration, experimental result shows that this absorbing material can reach 88% absorptivity on working frequency range, just because it requires the electric field polarization direction of incident electromagnetic wave must be parallel to the length direction of back metal sheet, thereby its application has been constituted very big restriction.

Summary of the invention

The invention provides a kind of slab wave-absorbing material, on the basis that guarantees the original structure absorbing property, have the arbitrary polarisation direction electromagnetic wave absorption function.

The perfect absorbent structure that the present invention is directed to people's propositions such as professor Smith and Landy only has this deficiency of single polarised direction, on the basis that guarantees the original structure absorbing property, focuses on and expands its polarised direction.Specifically, be criss-cross construction, or increase to 3 and branch to the hexagonal decussate texture, by that analogy as 2 branches by the original structure unit is increased to the multiple-limb decussate texture.Along with the increase of branch, institute absorbent electric field polarization angle also increases thereupon, also is that structure is inhaled the reduction of wave polarization susceptibility until reaching the requirement of any polarization suction ripple.Consider that branch's increase can make the detail length of branches end shorten, the suction wave frequency raises, so select Finite Branching number (as 2～4 branches), and the terminal detail become arc strip by rectangular, and then realize that Finite Branching counts polarized electromagnetic wave absorption arbitrarily in the plane under the situation.

Detailed technology scheme of the present invention is:

A kind of slab wave-absorbing material as shown in Figure 2, comprises the unit absorbent structure of periodic arrangement, and described unit absorbent structure comprises the front metallic structure A of medium substrate C, medium substrate C and the back metal structure B of medium substrate C.The front metallic structure A of medium substrate C is made of 2～4 centers cross one another " linear ", the first metal branch line; The two ends of described every first metal branch line all have and vertical " linear " that the links to each other second metal branch line of this first metal branch line.The back metal structure B of medium substrate C is made of 2～4 centers cross one another " linear ", the first metal branch line; All the metal branch line is tangent is connected with " annular " second at the two ends of described every first metal branch line.

A kind of slab wave-absorbing material as shown in Figure 2, comprises the unit absorbent structure of periodic arrangement, and described unit absorbent structure comprises the front metallic structure A of medium substrate C, medium substrate C and the back metal structure B of medium substrate C.The front metallic structure A of medium substrate C is made of 2～4 centers cross one another " linear ", the first metal branch line; The two ends of described every first metal branch line all have and tangent " camber line shape " the second metal branch line that is connected of this first metal branch line.The back metal structure B of medium substrate C is made of 2～4 centers cross one another " linear ", the first metal branch line; All the metal branch line is tangent is connected with " annular " second at the two ends of described every first metal branch line.

In the technique scheme, the angle between the first metal branch line of the front metallic structure A of described medium substrate C or back metal structure B equates.

In the such scheme, described medium substrate C is organic high molecular polymer substrate or inorganic ceramic substrate.

Compared with prior art, the present invention has following characteristics:

1, with respect to existing slab wave-absorbing material, the present invention has the polarization characteristic of any direction, promptly can absorb the electromagnetic wave of arbitrary polarisation direction.

2, with respect to existing slab wave-absorbing material, the present invention can carry out more excellent absorption in wideer electromagnetic field incident angle.

3, electromagnetic resonance structure of the present invention is separate, can regulate respectively, and the length width that changes the first or second metal branch line all can change effective dielectric constant and magnetic permeability, thereby has tuning characteristics easily.

Description of drawings

Fig. 1 is the perfect absorbent structure synoptic diagram that people such as Pendry proposes.

Fig. 2 is the structural upright synoptic diagram of the slab wave-absorbing material that proposes of the present invention.Wherein, A is the front metallic structure of medium substrate C, and B is the back metal structure of medium substrate C, and C is a medium substrate.

Fig. 3 is the S parameters simulation result of the specific embodiment of the present invention.

Fig. 4 is the S11 parameter measured result of the specific embodiment of the present invention.

Fig. 5 is that the specific embodiment of the present invention is at the asynchronous S parameter of incident electromagnetic wave polarization angle range value simulation result.

The S parameter range value simulation result that Fig. 6 is the specific embodiment of the present invention when incident electromagnetic wave is different incidence angles and spends.

Embodiment

Fig. 2 is a specific embodiment of the present invention, and this slab wave-absorbing material comprises the unit absorbent structure of periodic arrangement.Each cellular construction comprises back metal structure B and the medium substrate C of front metallic structure A, the medium substrate C of medium substrate C.Wherein, the identical and center is cross one another " linear " the first metal branch line constitutes the front metallic structure A of medium substrate C by 2, and the angle between described 2 the first metal branch lines is 90 degree; The two ends of described every first metal branch line all have and tangent " camber line shape " the second metal branch line that is connected of this first metal branch line; Form a annulus between the described second metal branch line with 4 identical breach.

Fig. 3 and Fig. 4 have provided the s parameters simulation and the measured result of the embodiment of the invention, as can be seen from the figure, and near 11.2GHz, | S11| has obvious absorption peaks, | S21| can both be less than-18dB in the very big scope of relative bandwidth, i.e. reflection and transmission is all very little, has realized good electro-magnetic wave absorption.Fig. 5 has provided the simulation result that the invention process is listed in the absorptive character under the different polarization of the incident wave angles, and the present invention has assimilation effect preferably to any polarized electromagnetic wave as can be seen.Fig. 6 has provided the simulation result of the present invention when the different electromagnetic field incident angle.In 0-45 degree scope, the variation of incident angle is little to the influence of structure wave-absorbing effect as can be seen.

Claims (4)

Translated fromChinese

1、一种平板式吸波材料，包括周期性排列的单元吸波结构，所述单元吸波结构包括介质基板(C)、介质基板(C)的正面金属结构(A)和介质基板(C)的背面金属结构(B)；其特征在于：1. A flat plate absorbing material, comprising periodically arranged unit absorbing structures, the unit absorbing structures comprising a dielectric substrate (C), a front metal structure (A) of the dielectric substrate (C) and a dielectric substrate (C ) back metal structure (B); it is characterized in that:所述介质基板(C)的正面金属结构(A)由2～4条中心相互交叉的“直线形”第一金属分支线构成；所述每条第一金属分支线的两端均具有与该条第一金属分支线垂直相连的“直线形”第二金属分支线；The front metal structure (A) of the dielectric substrate (C) is composed of 2 to 4 "straight" first metal branch lines whose centers intersect with each other; both ends of each first metal branch line have A "straight-line" second metal branch line vertically connected to the first metal branch line;所述介质基板(C)的背面金属结构(B)由2～4条中心相互交叉的“直线形”第一金属分支线构成；所述每条第一金属分支线的两端均与一“圆环形”第二金属分支线相切连接。The back metal structure (B) of the dielectric substrate (C) is composed of 2 to 4 "straight" first metal branch lines whose centers intersect with each other; both ends of each first metal branch line are connected to a " Ring" second metal branch lines are connected tangentially.2、一种平板式吸波材料，包括周期性排列的单元吸波结构，所述单元吸波结构包括介质基板(C)、介质基板(C)的正面金属结构(A)和介质基板(C)的背面金属结构(B)；其特征在于：2. A flat plate absorbing material, comprising periodically arranged unit absorbing structures, the unit absorbing structures comprising a dielectric substrate (C), a front metal structure (A) of the dielectric substrate (C) and a dielectric substrate (C ) back metal structure (B); it is characterized in that:所述介质基板(C)的正面金属结构(A)由2～4条中心相互交叉的“直线形”第一金属分支线构成；所述每条第一金属分支线的两端均具有与该条第一金属分支线相切连接的“弧线形”第二金属分支线；The front metal structure (A) of the dielectric substrate (C) is composed of 2 to 4 "straight" first metal branch lines whose centers intersect with each other; both ends of each first metal branch line have An "arc-shaped" second metal branch line connected tangentially to the first metal branch line;所述介质基板(C)的背面金属结构(B)由2～4条中心相互交叉的“直线形”第一金属分支线构成；所述每条第一金属分支线的两端均与一“圆环形”第二金属分支线相切连接。The back metal structure (B) of the dielectric substrate (C) is composed of 2 to 4 "straight" first metal branch lines whose centers intersect with each other; both ends of each first metal branch line are connected with a " Ring" second metal branch lines are connected tangentially.3、根据权利要求1或2所述的平板式吸波材料，其特征在于，所述介质基板(C)的正面金属结构(A)的第一金属分支线之间的夹角相等；所述介质基板(C)的背面金属结构(B)的第一金属分支线之间的夹角相等。3. The planar wave-absorbing material according to claim 1 or 2, characterized in that the included angles between the first metal branch lines of the front metal structure (A) of the dielectric substrate (C) are equal; The included angles between the first metal branch lines of the back metal structure (B) of the dielectric substrate (C) are equal.4、根据权利要求1或2所述的平板式吸波材料，其特征在于，所述介质基板(C)为有机高分子聚合物基板或无机陶瓷基板。4. The planar wave-absorbing material according to claim 1 or 2, characterized in that the dielectric substrate (C) is an organic polymer substrate or an inorganic ceramic substrate.

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