CN110190407B - Broadband wave absorber based on resistive film and broadband wave absorber array - Google Patents
Broadband wave absorber based on resistive film and broadband wave absorber array Download PDFInfo
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- CN110190407B CN110190407B CN201910397521.8A CN201910397521A CN110190407B CN 110190407 B CN110190407 B CN 110190407B CN 201910397521 A CN201910397521 A CN 201910397521A CN 110190407 B CN110190407 B CN 110190407B
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 51
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 34
- 239000000758 substrate Substances 0.000 claims abstract description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 abstract description 9
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
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Abstract
The invention discloses a broadband wave absorber based on a resistive film and a broadband wave absorber array. The resistance film layer is composed of a hexagonal dielectric substrate and a hexagonal resistance film ring, and the resistance layer is composed of a hexagonal dielectric substrate and a hexagonal metal ring loaded with a resistor. The broadband wave absorber array adopts triangular periodic arrangement, and has better angle stability compared with common quadrilateral periodic arrangement. Compared with the common wave absorber loaded with lumped resistance, the wave absorber has wider wave absorbing bandwidth and wave absorbing rate, and has important application prospect in stealth technology, electromagnetic compatibility and radar wave absorbing technology.
Description
Technical Field
The invention relates to a broadband wave absorber based on a resistive film and a broadband wave absorber array, and belongs to the technical field of electromagnetic fields and microwaves.
Background
The electromagnetic wave absorbing structure is a material which can absorb most of the electromagnetic wave energy irradiated on the surface of the material and convert the electromagnetic wave energy into other forms of energy (mainly heat energy) without reflection. The study wave-absorbing structure starts with a Salisbury screen and a Jaumann absorber. By placing one or two resistive layers with appropriate resistance in front of a metal floor, a Salisbury screen or a Jaumann absorber can be formed. They are selective electromagnetic wave absorbers. Due to the unique frequency selection characteristic, the structural form and the characteristic designed aiming at specific frequency of the Salisbury screen, the Salisbury screen quickly gets attention, and meanwhile, a design thought is provided for the invention of the frequency selection surface. Due to the frequency selective characteristic of the FSS, the FSS can be used for pertinently absorbing radar waves or penetrating through the radar waves, the FSS belongs to a wave absorbing structure, and the FSS is a novel radome, so that the FSS shows great practical value and application prospect in the field of radar wave absorption.
The pursuit of the radar wave-absorbing structure for broadband and strong absorption is endless, and the research of the frequency selection surface wave-absorbing structure is a process of continuously pursuing wider and stronger absorption performance. When a wider and stronger wave-absorbing performance is pursued, the traditional wave-absorbing effect is achieved by utilizing the lumped element, the achieved bandwidth is very limited, and the wave-absorbing rate is not too high. The resistance film used in this case can solve these problems well. Therefore, a broadband wave absorber based on the resistive film is needed to be researched, important technical support is provided for the fields of electromagnetic stealth, electromagnetic compatibility and radar wave absorption, and important military and civil values are achieved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the broadband wave absorber based on the resistive film and the broadband wave absorber array effectively solve the problems that the bandwidth of the traditional loading lumped resistance is insufficient and the wave absorbing rate is not high, provide important technical support for the fields of electromagnetic stealth, electromagnetic compatibility and radar wave absorption, and have important military and civil values.
The invention adopts the following technical scheme for solving the technical problems:
a broadband wave absorber based on a resistive film comprises a resistive film layer positioned on the top layer, a resistive layer positioned on the middle layer and a metal back plate positioned on the bottom layer, wherein air layers are arranged between the resistive film layer and the resistive layer and between the resistive layer and the metal back plate; the resistance film layer comprises a regular hexagonal dielectric substrate and a regular hexagonal resistance film ring on the dielectric substrate, and the resistance film ring is superposed with the center of the dielectric substrate; the resistance layer comprises a regular hexagonal dielectric substrate and a regular hexagonal metal ring on the dielectric substrate, the metal ring is overlapped with the center of the dielectric substrate, a resistor is arranged in the middle of each edge of the metal ring, an area between every two adjacent resistors is made of copper, the area is a symmetrical hexagon, two edges of the symmetrical hexagon are overlapped with the outer edge of the metal ring, the other two edges of the symmetrical hexagon are overlapped with the inner edge of the metal ring, the last two edges are perpendicular to the outer edge and the inner edge, the length of two edges perpendicular to the outer edge and the inner edge is equal to half of the difference between the height of the regular hexagon formed by the length of the outer edge of the metal ring and the height of the regular hexagon formed by the length of the inner edge of the metal ring, and the two edges perpendicular to the outer edge and the inner edge are overlapped.
In a preferred embodiment of the broadband wave absorber of the present invention, the thickness of the regular hexagonal dielectric substrate is 0.25mm, the thickness of the metal back plate is 0.5mm, and the thickness of the air layer is 4 mm.
As a preferable mode of the broadband wave absorber of the present invention, the side length of the regular hexagonal dielectric substrate is 5.5mm, the outer side length of the regular hexagonal resistive film ring and the outer side length of the regular hexagonal metal ring are both 5.25mm, the distance between the outer side length and the inner side length of the regular hexagonal resistive film ring is 2.3mm, and the distance between the outer side length and the inner side length of the regular hexagonal metal ring is 2.3 mm.
As a preferable scheme of the broadband wave absorber, the size of the resistor is 220 omega, and the length of the resistor is 1 mm.
The array comprises a plurality of broadband wave absorbers based on the resistive film, and for any two adjacent edges of a certain broadband wave absorber based on the resistive film, the central connecting lines of three width wave absorbers based on the resistive film sharing the two edges are in an equilateral triangle shape.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the broadband wave absorber adopts the resistance film layer and the resistance layer, and the wave absorber based on the resistance film has wider bandwidth and higher wave absorbing rate through the connection of the two air layers, thereby effectively solving the defects of the traditional wave absorber.
2. The broadband wave absorber array adopts triangular periodic arrangement, and compared with the common quadrilateral periodic arrangement, the wave absorbing structure has better angle stability.
Drawings
Fig. 1 is a side view of a cell structure of a wide band absorber based on a resistive film according to the present invention.
Fig. 2 is a schematic structural diagram of the top layer and the middle layer of the broadband wave absorber based on the resistive film of the present invention, wherein (a) is the resistive film layer, and (b) is the resistive layer.
Fig. 3 is a physical diagram of the top layer and the middle layer of the broadband wave absorber based on the resistive film, wherein (a) is the resistive film layer, and (b) is the resistive layer.
FIG. 4 is a simulation result diagram of wave absorption rate of the broadband wave absorber array based on the resistive film.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1 and fig. 2 (a), (b), the resistive film based broadband wave absorber unit structure of the embodiment of the invention includes a top resistive film layer, a middle resistive layer and a bottom metal back plate. The periodic structure unit of the resistance film layer comprises a hexagonal dielectric substrate and a hexagonal resistance film ring on the substrate; the metal periodic structure unit of the resistance layer comprises a hexagonal dielectric substrate and a hexagonal metal ring on the substrate, and each edge of the metal ring is provided with a resistor. The total thickness of the wave-absorbing structure is 9mm, wherein the top layer and the middle layer are both 0.25mm, and the air layer is both 4 mm. Wherein each parameter is p-5.5 mm, a-5.25 mm, w-2.3 mm, g-1 mm, t1＝4mm，t2＝0.25mm，R＝220Ω。
The broadband wave absorber array based on the resistive film is mainly in triangular periodic arrangement, and compared with common quadrilateral periodic arrangement, the wave absorbing structure has better angle stability.
The wave absorber based on the resistive film has wider bandwidth and higher wave absorbing rate by adopting the resistive film layer and the resistive layer and connecting the two air layers, thereby effectively solving the defects of the traditional wave absorber.
According to the working frequency band of the broadband wave absorber based on the resistive film, Rogers RT5880 and the like can be selected as the material of the dielectric substrate, metal with good conductivity and stable property can be selected as the metal structure material, such as copper, gold, aluminum and the like, and common resistance can be selected as the resistance.
Fig. 3 shows a physical model of a resistive film based broadband wave absorber. Wherein: (a) the broadband wave absorber object resistance layer structure based on the resistance film is shown in the schematic diagram, and the broadband wave absorber object resistance layer structure based on the resistance film is shown in the schematic diagram.
In this embodiment, the broadband wave absorber based on the resistive film operates in the microwave band, the dielectric substrate adopts a Rogers RT5880 high-frequency microwave board, the thickness is 0.25mm, a 24 × 26 metal periodic array is manufactured on the dielectric substrate by adopting a standard PCB processing technology, and the total size is 255 × 270mm2The thickness of the metal structure adopts 35 mu m copper, and the resistor adopts 0804 packaging. The wave-absorbing structure realizes the wave-absorbing bandwidth of 22.25GHz within 3.95-26.2GHz, and the wave-absorbing rate reaches 90%.
Fig. 4 is a graph showing simulation results of wave absorption rate of the broadband wave absorber based on the resistive film.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (5)
1. A broadband wave absorber based on a resistive film is characterized by comprising a resistive film layer positioned on the top layer, a resistive layer positioned on the middle layer and a metal back plate positioned on the bottom layer, wherein air layers are arranged between the resistive film layer and the resistive layer and between the resistive layer and the metal back plate; the resistance film layer comprises a regular hexagonal dielectric substrate and a regular hexagonal resistance film ring on the dielectric substrate, and the resistance film ring is superposed with the center of the dielectric substrate; the resistance layer comprises a regular hexagonal dielectric substrate and a regular hexagonal metal ring on the dielectric substrate, the metal ring is overlapped with the center of the dielectric substrate, a resistor is arranged in the middle of each edge of the metal ring, an area between every two adjacent resistors is made of copper, the area is a symmetrical hexagon, two edges of the symmetrical hexagon are overlapped with the outer edge of the metal ring, the other two edges of the symmetrical hexagon are overlapped with the inner edge of the metal ring, the last two edges are perpendicular to the outer edge and the inner edge, the length of two edges perpendicular to the outer edge and the inner edge is equal to half of the difference between the height of the regular hexagon formed by the length of the outer edge of the metal ring and the height of the regular hexagon formed by the length of the inner edge of the metal ring, and the two edges perpendicular to the outer edge and the inner edge are overlapped.
2. The resistive film-based broadband wave absorber of claim 1, wherein the thickness of the regular hexagonal dielectric substrate is 0.25mm, the thickness of the metal back plate is 0.5mm, and the thickness of the air layer is 4 mm.
3. The broadband wave absorber based on resistive film as claimed in claim 1, wherein the side length of the dielectric substrate of the regular hexagon is 5.5mm, the outer side length of the resistive film ring of the regular hexagon and the outer side length of the metal ring of the regular hexagon are both 5.25mm, the distance between the outer side length and the inner side length of the resistive film ring of the regular hexagon is 2.3mm, and the distance between the outer side length and the inner side length of the metal ring of the regular hexagon is 2.3 mm.
4. The resistive film based broadband wave absorber of claim 1, wherein the resistance is approximately 220 Ω and the length of the resistance is 1 mm.
5. A resistive film based broadband wave absorber array comprising a plurality of resistive film based broadband wave absorbers according to claim 1, wherein for a resistive film based broadband wave absorber, two adjacent edges of any one of the resistive film based broadband wave absorbers are connected by the centers of three resistive film based broadband wave absorbers sharing the two edges to form an equilateral triangle.
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| CN111146596B (en) * | 2019-12-30 | 2021-02-26 | 华中科技大学 | Wave absorbing/transmitting device of composite window absorber |
| CN111641046B (en) * | 2020-05-07 | 2021-07-06 | 宁波大学 | Microwave band broadband circular dichroism chirality wave absorber |
| CN114649689A (en) * | 2020-12-18 | 2022-06-21 | 菜鸟智能物流控股有限公司 | Wave absorber and preparation method thereof |
| CN113097733B (en) * | 2021-03-11 | 2022-11-01 | 中国科学院国家空间科学中心 | Hexagonal super-surface broadband high-gain antenna |
| CN113054443B (en) * | 2021-03-23 | 2024-02-06 | 广东顺德西安交通大学研究院 | Low-frequency wave absorber |
| CN113410655B (en) * | 2021-06-10 | 2022-06-03 | 北京理工大学 | Ultra-wideband wave absorber with symmetrical G-shaped bending structure |
| CN114142246B (en) * | 2021-11-24 | 2023-06-23 | 中国人民解放军空军工程大学 | Broadband wide-angle metamaterial wave absorber based on gradual change impedance and preparation method |
| CN114204279B (en) * | 2021-12-14 | 2022-08-26 | 中南大学 | Resistance loading quad ring ultra wide band absorbing structure |
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| KR20170098074A (en) * | 2016-02-19 | 2017-08-29 | 국방과학연구소 | A ultra-wideband metamaterial absorber |
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| CN109560374A (en) * | 2018-11-22 | 2019-04-02 | 西安电子科技大学 | A kind of Fabry-Perot antenna of the low radar cross section of high-gain |
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