CN104780747A - Electric wave absorption plate of plant product - Google Patents
Electric wave absorption plate of plant product Download PDFInfo
- Publication number
- CN104780747A CN104780747A CN201410016304.7A CN201410016304A CN104780747A CN 104780747 A CN104780747 A CN 104780747A CN 201410016304 A CN201410016304 A CN 201410016304A CN 104780747 A CN104780747 A CN 104780747A
- Authority
- CN
- China
- Prior art keywords
- wave absorption
- electric wave
- rubber
- paster
- plant product
- 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.)
- Pending
Links
Abstract
The invention discloses an electric wave absorption plate of a plant product. The plant product in a hollow structure is burnt, graded and then mixed to an adhesive; shaping is performed on the plate; and then an electric wave absorption paster is formed. The absorption paster can utilize high-dielectric loss of a carbon material burnt by the plant product, so that the absorption paster has high electric wave absorption property; and the absorption property of an oblique incident electric wave can be improved by utilizing the hollow structure. The plant product in the hollow structure can adopt materials such as a rice hull, soybean skin, a sugarcane millet hull, a soybean straw and a wheat straw; the adhesive adopts materials such as ethylene-propylene rubber, silica rubber, low-density polyethylene, isoprene, polyurethane rubber, glass wool, polyvinyl chloride resin, EVA (Ethylene Vinyl Acetate) rubber, NBR (Nitrile Butadiene Rubber), epoxy resin and ceramic resin; the electric wave absorption paster is a single-layer paster with thickness of 1-5mm, and has high electric wave absorption property and high oblique incident electric wave absorption property; and the absorbed electric wave can be changed by adjusting the thickness of the plate.
Description
Technical field
The present invention relates to a Plants product EM wave absorption board, what be specifically related to is by the plate that can absorb electric wave formed after shaping onboard in rubber or resin mixing after having hollow structure plant product to carry out burning till classification.
Background technology
In prior art, electric wave absorption is the technology of the anti-pseudogame as radar, ship mast or boats and ships etc. are formed by the use at the bridge angle of bridge, also have, in highway ETC charge station, because the reason generation banister of the metal structure reflection of electric wave in charge station is not opened or the case such as secondary charge, the metal structure being arranged on this reflection is formed.
Further, these electric wave fields utilizing GHz to be with are extensive use fields of 2.45GHz WLAN, the short-range communication of 18GHz, 24GHz approach radar, 38GHz telecommunication, 60GHz76GHz94GHz closely radar etc.When using these electric waves, produced by the radio wave attenuation of metal structure of marching into the arena too in these applications, the multiple line of the false proof and communication electric wave of radar etc. and the technology that occurs.
And, the electric wave that multiple line etc. that is false proof to these radars and communication electric wave produces, by using masking material to radio wave attenuation investigation, this electric wave masking material itself is also the situation of metal is common, causes the reason such as multiple line of the false proof and communication electric wave of radar again.Therefore, consider the method that do not use reflection wave, cover, use the countermeasure of the energy absorbing radio wave attenuation electric wave to prevent the method for the multiple line of the false proof and communication electric wave of these radars from replacing.
Patent No. CN98800357 describes a kind of radio wave absorption sheet material, comprises the first dielectric substrate that parallel placement is spaced apart at a predetermined distance from each other with the second dielectric substrate and be placed on middle insulating substrate in the middle of the first and second dielectric substrate and parallel with it.First and second dielectric substrate each on the whole surface of its side, be covered with continuous print conductive film.Multiple conductive film being arranged to band shape or array is covered with in middle insulating substrate side.
As the technology of these electric wave absorbing materials, be the electric wave absorbing materials adopting iron, mainly there is following problem:
1, use iron plate as electric wave absorbing materials, its weight is very heavy, uses limited.
2, the plate of individual layer absorbs and is slanted through electric wave poor performance.
3, ball kind is not had at the electric wave more than 30GHz milli ripple field.
Summary of the invention
In order to overcome above-mentioned three kinds of shortcomings of wave absorber using iron, one of the object of the invention is by after having hollow structure plant product to carry out burning till classification, and mixing formation after shaping onboard in rubber or resin absorbs electric wave plate.This baffle is by comparative material lightweight more than 50%.On the other hand, utilize hollow structure to improve and be slanted through the absorbent properties of electric wave, thus the plant product after burning till is become there is the material with carbon element that height lures electric loss, can absorb the electric wave of wavestrip scope in the least.
In addition, two of the object of the invention is under the environment for use that waits without of this EM wave absorption board, uses the material such as halogen element, polyvinyl chloride, is formed to prevent immersion flaggy about 0.1mm thickness.
Above-mentioned purpose of the present invention is realized by following technological means.
One Plants product EM wave absorption board, this EM wave absorption board to have hollow structure plant product to burn till, and mixingly after classification after adhesive (bonding material) inner shaping, forms electric wave absorption paster.The height that material with carbon element after this absorption adhesive patch can utilize plant product to burn till has lures electric loss, while making it have the electric wave absorption performance of height, utilizes hollow structure, can improve the absorbent properties being slanted through electric wave.The plant product of above-mentioned hollow structure, can adopt the material hollow structure plants such as such as rice hulls, soybean epidermis, sugarcane broomcorn millet shell, soybean stalk, wheat straw, bamboo pole.Above-mentioned adhesive (bonding material) uses the materials such as ethene, propylene-diene rubbers, silicone rubber, low density polyethylene (LDPE), isoprene (asynthetic rubber), polyurethane rubber, mineral wool, Corvic, EVA rubber, NBR rubber, acrylated polyurethane resin, epoxy resin, ceramic resin.The individual layer paster of above-mentioned electric wave absorption paster to be thickness be 1 ~ 5mm, has high radio wave absorbent properties and height is slanted through electric wave absorption performance, can be changed the electric wave of absorption by the thickness adjusting plate.
Use above-mentioned material frequency at 2.45GHz, 5.8GHZ, 10ghz, 18GHZ, 24GHz, 38GHz, 60GHz, 76GHz, 94GHz, electric wave injects angle under the scope of 0 °, 15 °, 30 °, 45 °, 55 °, can make the EM wave absorption board of more than absorption-20dB (more than 99%).
Under the environment for use that above-mentioned EM wave absorption board waits without, use the material such as halogen element, polyvinyl chloride, be preferably formed as thickness and prevent immersion flaggy from being good at about 0.1mm.
Free-space Method: this mensuration irradiates electromagnetic wave according to transmitting antenna on measured material on probation, the reflected wave accepting antenna-reflected accordingly carries out level determination.
Reflection coefficient is that the level of the conductor plate reflected wave of the size identical with determined use material compares gained.But practical measurement is reflected wave as material on probation with accepting that electromagnetic wave that antenna accepts has more than, and also has from arranging the reflected wave of thing, ripple at random and the direct transmission wave of reception antenna around.Wherein unwanted reflected wave, ripple time domain method at random are controlled.The mensuration characteristic of frequency range is according to the netted analyzer of mensuration built-in time domain function change time domain, this due to around the reflected wave of thing, ripple at random are set and directly reception antenna transmission wave is different from the transmission path of material reflects ripple on probation, so the difference time of advent of acknowledge(ment) signal.Namely various ripple produces different time value in time domain.Therefore in its time domain by controlling to select material reflects ripple on probation, carry out Fourier transform remove around the reflected wave of thing is set, the impact of ripple at random obtains material reflects wave frequency characteristic on probation.Wherein: with the electric wave absorption performance that 2.45GHz, 5.8GHZ, 10ghz, 18GHZ, 24GHz, 38GHz, 60GHz, 76GHz, 94GHz make EM wave absorption board can prevent-20dB 99% radio wave attenuation.The radio wave attenuation decay in this data representation front.
embodiment
Embodiment: < filler > first, be described the summary of the EM wave absorption board about this example.In this example, the carbonization of plant product is burnt till, manufacture plant burned material.With paddy, soybean, sugarcane bar produce a large amount of husk after utilizing as food as raw material, soybean skin, sugarcane squeeze after stalk, become the discarded thing of burning outside normally utilizing as the feed of domestic animal and other objects.Research and development process of the present invention is these discarded materials of recycling, becomes the thing useful to wave absorber.
Plant burned material at temperature about 600 DEG C ~ 3000 DEG C, use the carbonizing plant of static stove, revolving burner etc., in the environment or vacuum of the non-activity gases such as nitrogen, arrive assigned temperature selectively after with 3 hours, carry out burning till obtaining.
Secondly, by the result of research experiment repeatedly, the hollow structure utilizing plant burned material, the absorbent properties being slanted through electric wave are improved.Thus understand that plant burned material is not pulverized and also can utilize well.
In addition, the particle of these plant burned materials is uneven, would not obtain the electric wave absorption performance of expectation.Therefore, get median asking of 10-500um, be added on the particle concentrated in intermediate range and carry out classification operation.
In this example of < adhesive >, the ethene, propylene-diene rubbers, silicone rubber, low density polyethylene (LDPE), isoprene (asynthetic rubber), polyurethane rubber, mineral wool, Corvic, EVA rubber, NBR rubber, acrylated polyurethane resin, epoxy resin, ceramic resin etc. that this plant burned material are carried out bonding carry out mixing mediation.Adhesive will have good thermal endurance, formability.
Moreover, be not particularly limited below, be the mother metal of soybean skin as burned material as filler, adhesive is described with the example of ethene, propylene-diene rubbers.
Soybean skin burned material is got median by the compounding procedure > of < filler and adhesive between 10-500um, add after ethene, propylene-diene rubbers coordinate according to the carrying out of about 50-80wt%, this rubber is added sulphur and shaping, final electric wave absorption patch products can be obtained.
Soybean skin burned material and ethene, propylene-diene rubbers are added various naphthalene Series Oils, fragrant Series Oil, aromatic series Series Oil, paraffin series wet goods additive, together with mixing roll, carry out mixing process.
The mixing roll of this example is the kneader (DS20-40) of the compression type using Sen Shan Co., Ltd. to produce. temperature about less than 110 DEG C, the processing time of mixing is about 20 points.Here condition of heating, processing time only illustrate, be not limit, condition of heating 90 DEG C ~ 120 DEG C, the processing time scope of 5 points ~ about 25 points is more suitable.
Next mixing thing is carried out calendering process by the shaping > of < paster after cooling fully.Calender be Liu Lai make single roller (15 inches wide).Calendering process is carried out at normal temperatures.These rolling conditions just citing do not limit.Can process in 10 inches of wide ~ 20 inch wide scope, also can process under the environment of how much to heat etc.
After carrying out desired sulfur adding treatment after implementing > outside < room, the manufacture of electromagnetic wave absorption board completes.This electromagnetic wave absorption board without etc. environment for use time, use the material such as halogen element, polyvinyl chloride, formed and prevent immersion flaggy about 0.1mm thickness.
| Frequency number (GHz) | 2.45 | 5.8 | 10 | 18 | 24 | 38 | 60 | 76 | 94 |
| Adhesive (wt%) | 60 | 60 | 60 | 60 | 60 | 60 | 55 | 55 | 55 |
| Plant burned material (wt%) | 35 | 35 | 35 | 35 | 35 | 35 | 40 | 40 | 40 |
| Paraffin (wt%) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Thickness (mm) | 5 | 2.5 | 1.8 | 1.6 | 1.5 | 1.3 | 2.2 | 2.1 | 1.8 |
Claims (5)
1. a Plants product EM wave absorption board, is characterized in that this EM wave absorption board to have hollow structure plant product to burn till, and mixingly after classification after adhesive (bonding material) inner shaping, forms electric wave absorption paster.
2. EM wave absorption board according to claim 1, is characterized in that the plant product of making of said hollow structure adopts rice hulls, soybean epidermis, sugarcane broomcorn millet shell material.
3. EM wave absorption board according to claim 1, is characterized in that said adhesive (bonding material) uses ethene, propylene-diene rubbers, silicone rubber, low density polyethylene (LDPE), isoprene (asynthetic rubber), polyurethane rubber, mineral wool, Corvic, EVA rubber, NBR rubber, acrylated polyurethane resin, epoxy resin, ceramic resin material.
4. EM wave absorption board according to claim 1, is characterized in that said electric wave absorption paster to be thickness is the individual layer paster of 1 ~ 5mm.
5. EM wave absorption board according to claim 1, it is characterized in that said EM wave absorption board use halogen element, polyvinyl chloride, formed thickness about 0.1mm prevent soak flaggy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410016304.7A CN104780747A (en) | 2014-01-13 | 2014-01-13 | Electric wave absorption plate of plant product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410016304.7A CN104780747A (en) | 2014-01-13 | 2014-01-13 | Electric wave absorption plate of plant product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104780747A true CN104780747A (en) | 2015-07-15 |
Family
ID=53621881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410016304.7A Pending CN104780747A (en) | 2014-01-13 | 2014-01-13 | Electric wave absorption plate of plant product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104780747A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112469259A (en) * | 2020-11-20 | 2021-03-09 | 东北大学 | Heterogeneous atom doped woody plant based electromagnetic wave absorbing material and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101507381A (en) * | 2006-08-23 | 2009-08-12 | 三菱电线工业株式会社 | Radio wave absorber and method for producing the same |
| CN102164851A (en) * | 2008-09-29 | 2011-08-24 | 日清奥利友集团株式会社 | Burned plant material and electromagnetic shielding member |
| CN102532978A (en) * | 2012-02-05 | 2012-07-04 | 贵州华尚高新技术有限公司 | Electromagnetic wave absorbing and guiding material and wave absorbing paint |
| CN102821880A (en) * | 2010-03-26 | 2012-12-12 | 日清奥利友集团株式会社 | Product obtained by baking cacao bean husk |
-
2014
- 2014-01-13 CN CN201410016304.7A patent/CN104780747A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101507381A (en) * | 2006-08-23 | 2009-08-12 | 三菱电线工业株式会社 | Radio wave absorber and method for producing the same |
| CN102164851A (en) * | 2008-09-29 | 2011-08-24 | 日清奥利友集团株式会社 | Burned plant material and electromagnetic shielding member |
| CN102821880A (en) * | 2010-03-26 | 2012-12-12 | 日清奥利友集团株式会社 | Product obtained by baking cacao bean husk |
| CN102532978A (en) * | 2012-02-05 | 2012-07-04 | 贵州华尚高新技术有限公司 | Electromagnetic wave absorbing and guiding material and wave absorbing paint |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112469259A (en) * | 2020-11-20 | 2021-03-09 | 东北大学 | Heterogeneous atom doped woody plant based electromagnetic wave absorbing material and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Dadgarpour et al. | Mutual coupling reduction in dielectric resonator antennas using metasurface shield for 60-GHz MIMO systems | |
| Volakis et al. | Antenna engineering handbook | |
| Liu et al. | A compact ultrawideband MIMO antenna using QSCA for high isolation | |
| He et al. | Spatiotemporal characterization of self-interference channels for 60-GHz full-duplex communication | |
| Ali et al. | Design and fabrication of rectangular ring monopole array with parasitic elements for UWB applications | |
| CN104780747A (en) | Electric wave absorption plate of plant product | |
| CN204180467U (en) | Plant product EM wave absorption board | |
| CN102427160A (en) | Conformal antenna used for cylindrical carrier and application method thereof | |
| Smythe et al. | Organic-based microwave frequency absorbers using corn stover | |
| RU127255U1 (en) | ELECTROMAGNETIC WAVE ABSORBER | |
| Liu et al. | A wideband tri-polarized antenna at 2.4 GHz for array application | |
| Zain et al. | 2.4 GHz patch antenna on bio-composite substrate using quarter wave transmission line | |
| Dwivedi et al. | UWB-MIMO DGS loaded patch antenna with low profile for millimeter-wave applications | |
| CN207353448U (en) | Antenna | |
| Naktong et al. | Cantenna Adjustment with 1× 6 Woodpile Shaped EBG for Application in Goat Manure Moisture Content and Bulk Density Monitoring. | |
| Ekolle et al. | A Reliable Antenna Array for the 28GHz mmWave Band in a 5G Massive MIMO Communication | |
| Naser et al. | Analysis and design of MIMO antenna for UWB applications based on the super-formula | |
| Javanbakht et al. | Compact frequency selective surface antenna for grain moisture content monitoring | |
| Hu et al. | A new miniaturized absorber frequency selective surface for low frequency wave transmission and high frequency absorption | |
| Pítra et al. | Wideband feeders for millimeter-wave horn antennas | |
| CN112924938B (en) | 12 Send out 16 millimeter wave 4D formation of image radar microstrip antenna array that receive | |
| Eshaghi et al. | Wideband end-fire phased array for WiGig applications | |
| Wu | Low cost bowtie apertures for 18–40 ghz spectrum sensing and monitoring | |
| Xia et al. | Design of Radome Based on Multi-layer Structure with Wide Transmission Band | |
| Kalteh et al. | Directional UWB Microstrip Antenna for Radar Applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150715 |
|
| WD01 | Invention patent application deemed withdrawn after publication |