CN108346860B - Light-permeable structural broadband wave-absorbing material with water as loss medium - Google Patents
Light-permeable structural broadband wave-absorbing material with water as loss medium Download PDFInfo
- Publication number
- CN108346860B CN108346860B CN201810169888.XA CN201810169888A CN108346860B CN 108346860 B CN108346860 B CN 108346860B CN 201810169888 A CN201810169888 A CN 201810169888A CN 108346860 B CN108346860 B CN 108346860B
- Authority
- CN
- China
- Prior art keywords
- loss medium
- wave
- absorbing material
- loading device
- loss
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
The invention discloses a light-permeable structural broadband wave-absorbing material taking water as a loss medium, which belongs to the technical field of wave-absorbing materials and comprises a loss medium loading device and a bottom backboard, wherein the loss medium loading device and the bottom backboard form a closed structure; the loss medium loading device is made of transparent materials, the loss medium is deionized water, the bottom layer back plate is an ITO conductive film back plate, and two through holes used for injecting and discharging the deionized water are further formed in the bottom of the loss medium loading device. The wave-absorbing material takes the deionized water as a loss medium, the wave-absorbing bandwidth is remarkably expanded without increasing the thickness, and the selected constituent material has high light transmittance in a visible light frequency band, so that the constituent wave-absorbing material has high light transmittance.
Description
Technical Field
The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a light-permeable structural broadband wave-absorbing material taking water as a loss medium.
Background
In the information war of the new century, the stealth technology has profound influence on the viability and the operational efficiency of weaponry. Aiming at the existing high-precision, multiband and multi-base radar detection system which is rapidly developed, the radar detection precision can be effectively reduced by adopting wave-absorbing materials on the weaponry, so that the survival capability and the defense-breaking capability of the weaponry are improved. Meanwhile, with the rapid development of modern electronic information technology, electromagnetic radiation accompanied therewith is almost ubiquitous, and electromagnetic "pollution" problems such as electromagnetic interference and electromagnetic compatibility have seriously affected human health. The shielding effect of the electromagnetic wave-absorbing material can effectively reduce the potential threat of electromagnetic pollution to human health, so that the exploration of the high-performance electromagnetic wave-absorbing material is always a hotspot of the research in the field of novel electronic functional materials and devices.
At present, electromagnetic wave-absorbing materials can be divided into two categories, namely coating type and structural type wave-absorbing materials according to the forming process and the bearing capacity of the electromagnetic wave-absorbing materials, wherein the coating type is generally formed by compounding an adhesive and an adsorbent, the wave-absorbing capacity is mainly related to the type of the absorbent, the coating type wave-absorbing materials are emphasized because the process is simple, the use is convenient, and the adjustment is easy, but the coating type wave-absorbing materials can only absorb electromagnetic waves of a certain specific frequency band.
The structural wave-absorbing material has the dual functions of bearing and reducing the reflection of electromagnetic waves, has the characteristics of wider working bandwidth, high-efficiency wave-absorbing efficiency, easiness in preparation and low cost, and is always widely concerned by researchers, for example, Salisbury wave-absorbing screens, Jaumann wave-absorbing screens and circuit simulation wave absorbers are widely applied to the design of stealth materials. The structural wave-absorbing material fully utilizes the resonance response generated between the medium layer with ohmic loss and the metal back plate, and can obtain more ideal broadband wave-absorbing performance. However, some practical requirements of weapon equipment stealth impose more urgent requirements on some novel wave-absorbing materials. For example, in some special parts of the weaponry, such as visible windows and signal lights, not only is there a need for radar stealth, but there is also a need to maintain good light transmission.
At present, the wave-absorbing material for realizing optical transparency is mainly realized by adopting a transparent conductive film (such as ITO, graphene and the like) with a periodic structure to replace a traditional metal material, and the prior art (Zhouyiji, and the like. the design and performance of the optical transparency and double-waveband wave-absorbing metamaterial [ J ]. Miao, 2016,32(3):46-50) discloses an optical transparency and double-waveband wave-absorbing metamaterial, wherein a wave-absorbing body basic unit consists of an ITO cross microstructure, a patch structure, glass and an ITO film, the ITO microstructure is arranged on the upper layer, the middle layer is the glass, the lower layer is the ITO film, and the reflectivity of the material is less than-10 db in the frequency ranges of 8.5-11GHz and 14.5-16.5 GHz. However, in practical application, the difficulty and cost of the process for preparing the transparent conductive film with the periodic structure in a large area are still high. Therefore, the invention adopts the transparent aqueous solution as a loss medium, the transparent conductive film is only used as a reflecting back plate, the electromagnetic wave-absorbing material with high light transmittance in the visible light frequency band and wide-bandwidth angle wave-absorbing performance in the microwave frequency band is provided, and the problem of shielding of the visible light by the wave-absorbing material in the stealth technology or other fields is solved.
Disclosure of Invention
Against the background, the present invention aims to provide an electromagnetic wave absorbing material having high light transmittance in the visible light frequency band and broad bandwidth angle wave absorption performance in the microwave frequency band, so as to solve the problems in the prior art.
In order to achieve the purpose, the invention provides a light-permeable structural broadband wave-absorbing material taking water as a loss medium, which comprises a loss medium loading device and a bottom backboard, wherein the loss medium loading device and the bottom backboard form a closed structure, and the closed structure is filled with the loss medium; the loss medium loading device is made of transparent materials, the loss medium is deionized water, the bottom layer back plate is an ITO conductive film back plate, and two through holes used for injecting and discharging the deionized water are further formed in the bottom of the loss medium loading device.
Preferably, the lower surface of the loss medium loading device is provided with an inner recess, the top of the inner recess is provided with a plurality of cylindrical grooves upwards, the cylindrical grooves are distributed in a periodic array mode, deionized water is filled in the inner recess to form a complete water solution layer, the cylindrical grooves are filled with the deionized water to form a cylindrical periodic array structure layer, the upper water solution layer and the lower water solution layer are communicated, and the wave absorbing material core structure is formed jointly.
More preferably, the depth value h of the fovea10.5-2mm, unit period P of the cylindrical groove is 3-10mm, and depth h of the cylindrical groove2The diameter r of the cylindrical groove is 0-2mm, the ratio of the unit period P to the diameter r of the cylindrical groove is 0.1-0.9, the length and the width of the concave part are respectively MxP and NxP, M and N are integers which respectively represent the number of periods contained in the length direction and the width direction, and the distance h from the top end of the cylindrical groove to the upper surface of the loss medium loading device3Is 0.9-2.5 mm.
Preferably, the transparent material used to make the lossy dielectric carrying device has a dielectric constant of 2-5 and a dielectric loss angle of 0-0.05.
More preferably, the transparent material is selected from one of common glass, quartz glass, PMMA, PDMS.
Preferably, the square resistance value of the ITO conductive film is 1-20 omega/sq.
Preferably, the lossy medium carrying device and the bottom layer back plate are bonded by an adhesive along the peripheral edges, and two through holes for injecting and discharging deionized water are arranged along the opposite corners of the lossy medium carrying device, so that liquid can be injected and discharged at the later stage conveniently.
Compared with the prior art, the invention has the following advantages: 1. the invention takes deionized water as a loss medium, the deionized water has frequency dispersion and high loss characteristics in the relative dielectric constant of a microwave frequency band, and an electromagnetic resonance structure is formed by the deionized water and the ITO conductive film back plate at the bottom layer, so that the broadband electromagnetic wave absorption performance can be realized in the microwave frequency band, and the wave absorption bandwidth can be remarkably expanded without increasing the thickness; 2. the wave-absorbing material is characterized in that deionized water is used as a loss medium, a transparent material is used as a loss medium bearing device, and an ITO conductive film is used as a bottom layer back plate; 3. the broadband wave absorbing material has stable broadband wave absorbing performance on TE waves and TM waves of electromagnetic waves with oblique incidence within the range of 0-60 degrees; 4. the materials of deionized water, transparent material and ITO conductive film required by the invention are easy to obtain, the preparation cost is low, the preparation process is simple and mature, and the operability is strong; 5. by utilizing the circulating cooling effect of the aqueous solution, the wave-absorbing material also has the capacity of reducing infrared radiation.
Drawings
FIG. 1 is a schematic cross-sectional view of a light-permeable structural broadband wave-absorbing material using water as a loss medium in example 1 of the present invention;
fig. 2 is a schematic three-dimensional structure diagram of a light-permeable structural broadband wave-absorbing material using water as a loss medium in example 1 of the present invention;
FIG. 3 is a schematic view of a layered structure of a unit of a light-permeable structural broadband wave-absorbing material using water as a loss medium in example 1 of the present invention;
FIG. 4 is a wave-absorbing curve of the light-permeable structural broadband wave-absorbing material using water as a loss medium in example 1 of the present invention at room temperature;
fig. 5 is a wave-absorbing curve of the light-permeable structural broadband wave-absorbing material using water as a loss medium in example 4 of the present invention at room temperature.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The utility model provides an use water as light-permeable structure type broadband absorbing material of loss medium, structure type absorbing material includes loss medium loading attachment 2 and bottom backplate 3, loss medium loading attachment 2 forms the enclosed construction with the bonding agent bonding along all edges with bottom backplate 3, the enclosed construction intussuseption is filled with deionized water, the bottom of loss medium loading attachment 2 is equipped with two through-holes 4 that are used for pouring into and discharge deionized water, two through-hole 4 is followed loss medium loading attachment 2's diagonal setting is convenient for later stage injection and discharge liquid.
The surface of the loss medium loading device 2 close to the bottom layer back plate 3 is provided with an indent, the indent is filled with deionized water, and the used deionized water works at room temperature (25 ℃) and one standard atmospheric pressure.
Depth value h of the indent1Is 1mm, the distance from the concave top to the upper surface of the loss medium bearing device 2 is 2.5mm, the loss medium loading device 2 is made of quartz glass, the bottom layer back plate 3 is an ITO conductive thin film back plate, and ITO is conductiveThe sheet resistance of the film was 6. omega./sq.
The preparation method of the structural broadband wave-absorbing material comprises the following steps:
s1, manufacturing the lossy loading device 2 by using PMMA materials according to the pre-designed size;
s2, adhering and fixing the periphery of the lossy conducting loading device 2 manufactured in the step S1 on the ITO conductive film back plate 3 by using an adhesive;
and S3, opening through holes 4 at two ends of the bottom of the lossy medium loading device 2, connecting guide pipes, and taking the through holes as liquid inlet and outlet ports.
For the electromagnetic wave (TE wave or TM wave) with vertical incidence, the wave absorbing material of embodiment 1 has the wave absorbing performance shown in fig. 4, and it can be seen that, when the wave absorbing material has no columnar periodic array structure layer and only the water solution layer at the concave part forms the wave absorbing medium, the reflectivity of the wave absorbing material in the frequency band of 8.1 to 17GHz is lower than-10 dB, and the wave absorbing material has broadband wave absorbing performance.
Example 2
As shown in fig. 1 to 3, a light-permeable structural broadband wave-absorbing material using water as a loss medium includes a loss medium loading device 2 and a bottom layer back plate 3, the loss medium loading device 2 and the bottom layer back plate 3 are bonded together along the peripheral edges with an adhesive to form a closed structure, the closed structure is filled with deionized water, two through holes 4 for injecting and discharging deionized water are arranged at the bottom of the loss medium loading device 2, and the two through holes 4 are arranged along the opposite corners of the loss medium loading device 2, so as to facilitate the injection and discharge of liquid at the later stage.
The lower surface of the loss medium loading device 2 is provided with an inner recess, the top of the inner recess is upwards provided with a plurality of cylindrical grooves 1, the cylindrical grooves 1 are periodically distributed in an array mode, deionized water is filled in the inner recess and the cylindrical grooves 1, and the depth value h of the inner recess11mm, a unit period P of the cylindrical groove 1 of 5mm, and a depth h of the cylindrical groove 12Is 1mm, the diameter r of the cylindrical groove 1 is 2.5mm, and the distance h between the cylindrical groove 1 and the upper surface of the loss medium loading device 23Is 1.8 mm.
The lossy medium loading device 2 is made of common glass, the bottom layer back plate 3 is an ITO conductive film back plate, and the square resistance value of the ITO conductive film is 10.0 omega/sq.
The method for preparing the structural broadband wave-absorbing material in the embodiment 2 is the same as that in the embodiment 1.
Example 3
The difference between the wave-absorbing material in the embodiment 3 and the wave-absorbing material in the embodiment 2 is that the structural parameters are as follows: p10 mm, r 9mm, h1＝2mm，h2＝2mm，h3＝2.5mm。
The lossy medium loading device 2 is made of quartz glass, and the square resistance value of the ITO conductive film of the bottom layer back plate 3 is 20.0 omega/sq.
The method for preparing the light-permeable structural broadband wave-absorbing material with water as a loss medium in the embodiment 3 is the same as that in the embodiment 1.
Example 4
The difference between the wave-absorbing material in the embodiment 4 and the wave-absorbing material in the embodiment 2 is that the structural parameters are as follows: p5.2 mm, r 2.9mm, h1＝0.9mm，h2＝1.5mm，h3＝0.9mm。
The lossy medium loading device 2 is made of PMMA, and the square resistance value of the ITO conductive thin film of the bottom layer back plate 3 is 10.0 omega/sq.
The method for preparing the structural broadband wave-absorbing material of the embodiment 4 is the same as the preparation method of the embodiment 1.
The wave-absorbing material has a centrosymmetric periodic unit structure, so the wave-absorbing structure has the wave-absorbing characteristic of polarization independence. For the electromagnetic wave (TE wave or TM wave) with vertical incidence, the wave absorbing material has the wave absorbing performance shown in fig. 5. As can be seen, the reflectivity is lower than-10 dB in the frequency band of 6.7-19.8 GHz, and the broadband wave-absorbing material has broadband wave-absorbing performance.
Comparing fig. 4 and fig. 5, it can be seen that when the wave-absorbing material of the present invention is composed of the columnar periodic array structure layer and the concave aqueous solution layer (example 4), the wave-absorbing frequency band thereof is wider than the wave-absorbing frequency band of the wave-absorbing material composed of only the concave aqueous solution layer (example 1), and the wave-absorbing peak value of the wave-absorbing material in example 4 can reach-24 dB, while the wave-absorbing peak value of the wave-absorbing material in example 1 is-13 dB, and the wave-absorbing performance of the wave-absorbing material in example 4 is significantly better than that of the wave-absorbing material in example 1, so that it can be seen that the columnar periodic array structure layer of the present invention can significantly improve the wave.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention (e.g., cylindrical array to square column, cross, etc.) provided they come within the scope of the appended claims and their equivalents.
Claims (5)
1. The light-permeable structural broadband wave-absorbing material with water as a loss medium is characterized by comprising a loss medium loading device (2) and a bottom layer back plate (3), wherein the loss medium loading device (2) and the bottom layer back plate (3) form a closed structure, and the closed structure is filled with the loss medium;
the loss medium loading device (2) is made of transparent materials, the loss medium is deionized water, and the bottom layer back plate (3) is an ITO conductive thin film back plate;
the bottom of the loss medium loading device (2) is also provided with two through holes (4) for injecting and discharging deionized water;
the lower surface of the loss medium loading device (2) is provided with an inner recess, deionized water is filled in the inner recess to form a complete water solution layer, the top of the inner recess is upwards provided with a plurality of cylindrical grooves (1), the cylindrical grooves (1) are distributed in a periodic array mode, and the cylindrical grooves (1) are filled with the deionized water to form a columnar periodic array structure layer;
depth value h of the indent10.5-2mm, a unit period P of the cylindrical groove (1) of 3-10mm, and a depth h of the cylindrical groove (1)2Is 0-2mm, the ratio of the diameter r of the cylindrical groove (1) to the unit period P is 0.1-0.9, the length and the width of the concave part are respectively MxP and NxP, M and N are integers respectively representing the number of periods contained in the length and width directions, and the distance h from the top end of the cylindrical groove (1) to the upper surface of the loss medium loading device (2)3Is 0.9-2.5 mm.
2. The light-permeable structural broadband wave-absorbing material taking water as a loss medium according to claim 1, wherein the transparent material used for manufacturing the loss medium loading device (2) has a dielectric constant of 2-5 and a dielectric loss angle of 0-0.05.
3. The light-permeable structural broadband wave-absorbing material taking water as a loss medium according to claim 2, wherein the transparent material is selected from one of common glass, quartz glass, PMMA and PDMS.
4. The light-permeable structural broadband wave-absorbing material taking water as a loss medium according to claim 1, wherein the square resistance value of the ITO conductive film back plate is 1-20 Ω/sq.
5. The light-permeable structural broadband wave-absorbing material taking water as a loss medium according to claim 1, wherein the loss medium bearing device (2) and the bottom layer back plate (3) are bonded by an adhesive along the peripheral edges, and two through holes (4) for injecting and discharging deionized water are arranged along the loss medium bearing device (2) diagonally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810169888.XA CN108346860B (en) | 2018-03-01 | 2018-03-01 | Light-permeable structural broadband wave-absorbing material with water as loss medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810169888.XA CN108346860B (en) | 2018-03-01 | 2018-03-01 | Light-permeable structural broadband wave-absorbing material with water as loss medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108346860A CN108346860A (en) | 2018-07-31 |
| CN108346860B true CN108346860B (en) | 2020-11-13 |
Family
ID=62959554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810169888.XA Expired - Fee Related CN108346860B (en) | 2018-03-01 | 2018-03-01 | Light-permeable structural broadband wave-absorbing material with water as loss medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108346860B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109411897B (en) * | 2018-09-29 | 2020-12-01 | 南京邮电大学 | Broadband wave absorber based on gravity field regulation and control |
| CN110380226A (en) * | 2019-06-06 | 2019-10-25 | 南京大学 | A kind of mechanical adjustable electromagnetic wave absorption Meta Materials for filling water |
| CN113224543B (en) * | 2021-04-25 | 2022-08-02 | 中国人民解放军空军工程大学 | Visible light-infrared-microwave three-frequency-band compatible super surface |
| CN116940093B (en) * | 2023-05-23 | 2024-08-30 | 安徽大学 | Broadband microwave absorber |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106811175A (en) * | 2017-01-11 | 2017-06-09 | 中国人民解放军空军工程大学 | A kind of aqueous solution sound stage width band absorbing meta-material and preparation method thereof |
| CN107093804A (en) * | 2017-04-27 | 2017-08-25 | 南京大学 | A kind of adjustable artificial electromagnetic absorbing meta-material of Wideband for loading water droplet |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101684268B1 (en) * | 2015-04-15 | 2016-12-12 | 한국원자력연구원 | Biodegradable control of bacterial cellulose by radiation technology and absorbable peridental tissue regeneration material using the same |
-
2018
- 2018-03-01 CN CN201810169888.XA patent/CN108346860B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106811175A (en) * | 2017-01-11 | 2017-06-09 | 中国人民解放军空军工程大学 | A kind of aqueous solution sound stage width band absorbing meta-material and preparation method thereof |
| CN107093804A (en) * | 2017-04-27 | 2017-08-25 | 南京大学 | A kind of adjustable artificial electromagnetic absorbing meta-material of Wideband for loading water droplet |
Non-Patent Citations (1)
| Title |
|---|
| Metamaterial Absorber for Electromagnetic Waves in Periodic Water Droplets;Young Joon Yoo等;《Scientific Reports》;20150910;摘要，正文第2-8页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108346860A (en) | 2018-07-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108346860B (en) | Light-permeable structural broadband wave-absorbing material with water as loss medium | |
| CN108336504B (en) | Infrared-transmitted microwave broadband metamaterial wave absorber | |
| CN112928492B (en) | Tunable optical transparent broadband metamaterial wave absorber based on water layer | |
| CN111430926B (en) | Polarization insensitive low RCS ultra-wideband metamaterial wave absorber with visible light transmission | |
| CN113328261B (en) | Double-resonance broadband transparent metamaterial wave absorber based on toothed bending ring and square ring | |
| CN109921192A (en) | A kind of low frequency wave transparent high-frequency wideband inhales the frequency screening device of wave | |
| CN107689488B (en) | Frequency selection surface structure applied to ultra-wideband antenna | |
| CN103647152B (en) | Broadband polarization insensitive meta-material wave absorber | |
| CN103490171A (en) | Composite wave-absorbing material with wide frequency bands | |
| CN105552566A (en) | Vertical transparent metamaterial absorber | |
| CN117559141B (en) | Transparent broadband metamaterial wave absorber based on topological optimization and preparation method thereof | |
| CN105206904A (en) | Double-passband frequency selective surface based on high-dielectric low-loss all-dielectric metamaterial | |
| CN111430933B (en) | Spiral range upon range of ripples ware of ultra wide band | |
| CN206962022U (en) | Ka, W-waveband double frequency dual-linear polarization frequency-selective surfaces | |
| CN215255793U (en) | Liquid reconfigurable radar stealth window | |
| CN203013937U (en) | K-band plane paster lens antenna | |
| CN209448026U (en) | Temperature control frequency based on water selects wave-absorber | |
| CN103094713A (en) | K band plane patch lens antenna | |
| CN110505798A (en) | A kind of honeycomb Meta Materials transparent microwave absorber | |
| CN216389735U (en) | Frequency selection structure of three-dimensional high-frequency wave-transmitting low-frequency wave-absorbing | |
| CN114447622A (en) | Design of broadband ultrathin transparent wave absorber | |
| CN202217792U (en) | Microwave antenna | |
| CN114122738A (en) | Transparent broadband electromagnetic wave absorber based on ITO resistive film | |
| CN212209738U (en) | Millimeter wave radar | |
| CN113394570A (en) | Low-profile low-incidence-angle-sensitivity wave-absorbing surface and manufacturing process thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201113 |