CN107936533A - There is composite material, the preparation method and the usage of certain dielectric constant under high frequency - Google Patents
There is composite material, the preparation method and the usage of certain dielectric constant under high frequency Download PDFInfo
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- CN107936533A CN107936533A CN201711278029.6A CN201711278029A CN107936533A CN 107936533 A CN107936533 A CN 107936533A CN 201711278029 A CN201711278029 A CN 201711278029A CN 107936533 A CN107936533 A CN 107936533A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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Abstract
The invention discloses composite material, the preparation method and the usage under a kind of high frequency with certain dielectric constant, this method includes：Step 1, dielectric constant blank test test is carried out to basis material；Step 2, the property-modifying additive of different amounts is added into basis material, prepares the first polymer composite；Step 3, dielectric constant detection is carried out, establishes the test curve of the first polymer composite dielectric constant and property-modifying additive additive amount；Step 4, required according to the dielectric constant of different high frequencies, the usage ratio of property-modifying additive is primarily determined that according to above-mentioned test curve, prepare the second polymer composite；Step 5, dielectric constant test is carried out, the dosage of property-modifying additive, the dielectric constant until reaching requirement are adjusted according to test result.The present invention can easily prepare the contracting with differing dielectric constant under high frequency and, than material, meet that test request is compared in the contracting of nonmetallic materials under different occasions by different material mixture ratios.
Description
Technical field
The present invention relates to technical field of composite preparation, and in particular to answering with certain dielectric constant under a kind of high frequency
Condensation material, preparation method and the usage.
Background technology
It is to carry out electromagnetism scaling measurement etc. to obtain the nonmetallic materials with certain dielectric constant under high-frequency test frequency
The important prerequisite of experiment.
Electromagnetism scaling measurement is one of large-scale and foreign military's electromagnetic characteristic of scattering main method of research.Contract according to electromagnetism
Compare principle, it is desirable to the geometry of measured target, physical characteristic and test the relevant parameter of system and meet corresponding scale-relation.Metal
The target of material has been widely used in metal material Electromagnetic Scattering of Target spy due to being easily met scale-relation, scaling measurement
Property research in, but for nonmetallic materials such as cement flooring, rubber, meet contracting than closing except physical dimension, operation wavelength is kept
System is outer, it is also necessary to is consistent the dielectric property of two kinds of materials, but the dielectric constant of nonmetallic materials is larger with frequency generation
Change, this just needs to utilize analog composite material substitution truly nonmetallic target, refers to bibliography《Cement flooring electromagnetism contracting ratio
Testing Technology Study》(guidance and fuse, the 2nd phase in 2009, P58).For example, the Jie of rubber, cement material under 2GHz frequencies
Electric constant is respectively 3.81 and 4.67, both materials can change with the change of frequency, dielectric constant.Contracted according to electromagnetism
Than measure theory, when carrying out scaling measurement at different frequencies, it is ensured that the dielectric property of material is constant, and therefore, it is necessary to seek
A kind of alternative materials are looked for, dielectric constant of this alternative materials under high frequency 10GHz, 35GHz will be with rubber, cement in low frequency
Dielectric constant during 2GHz is consistent.
Contracted according to electromagnetism than principle and according to Bruggemen theoretical models and Maxwell-Garnett theoretical models,
Ensure that nonmetallic contracting is more identical with the dielectric constant of leiomyoma cells under true frequency range than the dielectric constant for testing frequency range in contracting than material,
Suitable nonmetallic contracting can be carried out by the powder raw material of known dielectric constant with high molecular material resin to construct than material, construction
Micro-structure close relation of the nonmetallic contracting completed than the dielectric constant and each component in this material of material.By compound
Material constructs, composition reparation and etc., the polymer composite for meeting scale-relation dielectric constant requirement can be constructed.
Meet that the composite material of certain dielectric constant of the electromagnetism contracting than requiring must is fulfilled for following composite request：
(1) it is more identical with the dielectric constant of leiomyoma cells under true frequency range than the dielectric constant for testing frequency range in contracting；
(2) it is closer to leiomyoma cells in physical properties such as intensity, toughness, elasticity；
(3) basic material has excellent solubility property, it can be achieved that dusty material is dispersed in basis material, and
Powder is not easy to precipitate；
(4) curing performance is excellent, and operability is good.
At present, existing certain research in terms of the investigation of materials required with specific dielectric properties.
Ceramic powders are added in metal matrix material, the composite material of very high-k can be obtained, such as patent CN
101550511 B《Ultra-high dielectric coefficient niobic acid receives potassium-silver particulate composite and preparation method》, describe one kind and received in niobic acid
Nitric acid aluminium powder is added in potassium nano-powder and is obtained dielectric constant and is reached 170000 composite material and preparation method thereof.But should
Composite property prepared by kind method differs greatly with nonmetallic materials, it is impossible to as nonmetallic materials of the contracting than test.
In recent years, the research on high dielectric constant polymer composite material is very much, and a kind of method of most common of which is
Prepare ceramic/polymer composite.Organic polymer based composites can be compound at a lower temperature, has elasticity, but
Be its own dielectric constant it is relatively low, so by using ceramics high dielectric property improve polymer matrix composite dielectric
Constant.Patent CN103382240B《Barium titanate/polymer composites of high-k and preparation method thereof》Describe one
Composite material of the kind with covalent bond connection structure between core-shell structure copolymer-shell, basis material is polymethyl methacrylate, adds material
Expect for barium titanate ceramics particle；Patent CN103547548A《Composite material with high dielectric constant and manufacture method》Kind is introduced in frequency
The preparation method of the composite material with high-k, composite material use ceramic particle under the frequency of 200MHz~4.5GHz
With polymer adhesive form, ceramic particle include barium titanate, barium strontium or its combination, polymer include silane, titanate esters,
Zirconate or its combination；Patent CN 102718981B《The preparation method and Meta Materials of a kind of composite material》One kind is described to exist
Dispersed nanometer scale ceramics particle adjusts the method for dielectric constant in organic high molecular layer preparation process.Organic polymer material
Expect that for poly- vitriol resin, Kynoar, cellulose acetate, polyimide resin or polyacrylonitrile, ceramic particle be nanoscale
Titanium dioxide granule, alumina particle, silica dioxide granule, silicon-carbide particle or silicon nitride particle；Patent CN10042412C
《A kind of manufacture method of high dielectric constant and low dielectric loss resin》Describe a kind of comprising nanometer core/shell structure composite particles
Insulating resin, is made of organic matter and nano particle, and wherein organic matter is nitrile rubber, neoprene or polyurethane rubber, is received
Rice grain is barium titanate, strontium titanates or aluminium titanates.However, this method is typically necessary larger ceramic filler amount, largely fill out
Filling ceramic body filler causes the modulus of elastomer to improve, and reduces the pliability and mechanical deformation ability of elastomer, composite material
Forming process is also more difficult；At the same time using ceramic powders as added material, it is difficult to obtain that there is superior dielectric under high frequency
The composite material of energy, therefore the composite material of above patent introduction is chiefly used in the occasion of below 10GHz.
To improve the problem of filling ceramic powders cause the processing of composite material and performance to reduce in polymer, can make
With one kind filling conductor either semiconductor fills, such as aluminium powder, silver powder, graphene, carbon nanotubes.Due to conductor/semiconductor
Filler solubility property is poor, easily forms the problems such as precipitating, have impact on the uniformity of composite material, it is necessary to which selection has excellent dissolving
The basis material of performance.Patent CN101293986A《High-dielectric composite material and its preparation side containing core@shell structure fillers
Method》Describe a kind of composite material containing aluminium powder and polystyrene, the content range of aluminium powder is 10~45wt%, polystyrene
Content range be 55~90wt%.Since polystyrene viscosity is big, bad dispersibility, uses and aluminium powder is passivated, with
The interfacial characteristics of composite material is lifted, the preparation process that this results in composite material is complex.
Polyurethane material is a kind of high molecular material with excellent mechanical performance and dielectric properties, its solubility property is good,
It can realize the dispersed of filler, and can be excellent with curing performance, operability is good, is a kind of excellent basis material,
But the more research for focusing on adjusting compound polyurethane material mechanical property, thermal property etc. of existing patent.Patent
CN201410763389《A kind of compound polyurethane material and preparation method thereof》One kind is described by oligomer polyol, isocyanic acid
Ester, the agent of small molecule diffusion chain, the molecular compound polyurethane material of sub-micrometer grain, its object is to lift the wear-resisting of composite material
Performance and mechanical property.Such as patent CN104212157A《A kind of high resilience polyurethane composite material and preparation method thereof》Disclose
A kind of high resilience polyurethane composite material, includes the light polylol in end, 50~70 parts of isocyanates, nano alumina powder part, ammonium
The components such as salt catalyst, its main purpose are to improve the elasticity and fatigue resistance of compound polyurethane material.Patent
CN105968290A《A kind of compound polyurethane material》One kind is described by ethyl acetate, isocyanates, nano magnesia, bamboo charcoal
The composite material that the compositions such as fiber, oxidant are formed, heat conductivility is improved by disperseing magnesium powder in polyurethane, additionally by
Bamboo charcoal fiber interacts with magnesium powder, improves the thermal conductivity factor of compound polyurethane material.
Patent CN105885005A《A kind of preparation method of polyurethane elastomer material》One kind is described to be total in acrylonitrile
Polyurethane elastomer material obtained from isocyanates is reacted is added in polymers.This method is carried by the way of chemical reaction
The dielectric constant and mechanical property of high polyurethane, but such method is little to the performance change of basis material, it is difficult to prepare
There is the composite material of high dielectric constant under high frequency band.
Also the research in terms of electromagnetism contracting is related in existing literature than material.Patent CN105224762A《One kind is based on electricity
The contracting of magnetic parameter optimization design is than composite material preparation method》Describe a kind of computational methods of the electromagnetism contracting than material, pass through by
The electromagnetic parameter testing of mixing material is combined with equivalent medium theory, and the electromagnetism contracting optimized, should than the preparation method of material
Patent mainly calculates angle from theoretical simulation and contracts electromagnetism than the mix proportion scheme of material, and carbonyl iron is adulterated using epoxy resin
Powder, since epoxy resin dissolubility is poor, property is crisp, the composite material of preparation is there are larger inhomogeneities, and easily cracking.Patent
CN106503311《Preparation method of the earth background electromagnetism contracting based on bio-based materials than material》Disclose a kind of based on biology
The earth background electromagnetism contracting of sill is mixed than the preparation method of material using bio-based magnetism radar absorbing particles and resin based binder
Close, by rolling mode can realize flat surface floor background contracting than material manufacture, biological based filler for cladding diatomite or
Spirulina particulate is coated, the materials such as carbonyl iron, NiFe, CoNiP, the biological based filler pair that this method uses are coated on filler surface
The adjustable range of dielectric constant is difficult to very big.
The content of the invention
Electromagnetism small scale test it is an object of the invention to solve nonmetallic materials target is difficult to obtain matched composite wood
Material, by adjusting the proportioning of filler, height can be prepared using polyurethane as basis material, conductor/semiconductor material as filler
Composite material is compared in the lower electromagnetism contracting with certain dielectric constant of frequency.
In order to achieve the above object, the present invention provides the preparation under a kind of high frequency with certain dielectric constant composite material
Method, it includes following steps：
Step 1, dielectric constant blank test test is carried out to the basis material for being not added with property-modifying additive；
Step 2, the property-modifying additive of some different amounts is added into the basis material for be not added with property-modifying additive, is mixed
Close, prepare some first polymer composites；
Step 3, dielectric constant detection is carried out to the first polymer composite of preparation, establishes the first macromolecule composite wood
Expect the test curve of dielectric constant and property-modifying additive additive amount；
Step 4, required according to the dielectric constant of different high frequency requirements, modified addition is primarily determined that according to above-mentioned test curve
The usage ratio of agent, is made the second polymer composite；
Step 5, dielectric constant test is carried out to the second polymer composite, and according to test fruit to property-modifying additive
Adding proportion is adjusted, and the dielectric constant until reaching requirement, using additive amount formula at this time, can obtain under high frequency
With certain dielectric constant composite material.
It is preferred that the basis material is elastic polyurethane.
It is preferred that the elastic polyurethane is mixed by the raw material of tri- kinds of components of A, B, C, the weight ratio of three kinds of components
For 50：50：0.75.
It is preferred that the property-modifying additive includes aluminium powder or graphite powder.
It is preferred that in step 2, the composite material need to cure 5h in 50 DEG C of ± 5 DEG C of baking ovens.
Present invention also offers have certain dielectric constant composite material under a kind of high frequency prepared according to above-mentioned method.
It is preferred that composite material dielectric constant under 10GHz is 3~5, the property-modifying additive is graphite powder, is added
It is 1%~20% to add mass fraction.
It is preferred that the particle diameter of graphite powder is not more than 400 mesh.
It is preferred that composite material dielectric constant under 10GHz is 5~30, the powder added material is aluminium powder, is added
It is 0.5%~20% to add mass fraction.
It is preferred that the particle diameter of aluminium powder is not more than 400 mesh.
The present invention by with high intensity, high resiliency, the basis material (polyurethane) of highly dissoluble and surface modification treatment (such as
Grinding, to increase surface area) the mixing of nanoscale high-k (be more than 10) powder added material, pass through and adjust modified addition
Adding proportion of the agent in basis material, can construct the polymer composite for possessing differing dielectric constant under high frequency.
The present invention has the following advantages compared with prior art：
1) polyurethane material has excellent solubility property, can ensure filler powder (modified addition as basis material
Agent, such as aluminium powder or graphite powder) it is dispersed, and be not easy to precipitate；
2) composite material prepared using the present invention, can not only accomplish there is specific dielectric constant in high frequency, and
And it is good with excellent strength and toughness, ageing resistance, contract as electromagnetism than material, the physical characteristic with prototype nonmetallic materials
Closely；
3) the dielectric constant adjustable range of composite material is big；
4) technique is simple, and it is convenient to prepare, and technological parameter is easy to control.
Brief description of the drawings
Fig. 1 is the preparation process flow for having under a kind of high frequency of the present invention certain dielectric constant composite material.
Fig. 2 is the test curve of composite material dielectric constant of the present invention and graphite powder additive amount.
Fig. 3 is the test curve of composite material dielectric constant of the present invention and aluminium powder additive amount.
Embodiment
Below in conjunction with attached drawing, by describing a preferable specific embodiment in detail, the present invention is further elaborated.
Under a kind of high frequency provided by the invention have certain dielectric constant composite material, by with high intensity, high resiliency,
The basis material of highly dissoluble and the nanoscale high-k powder added material mixed preparing of surface modification treatment, pass through tune
Adding proportion of the powder in basis material is saved, the polymer composite for possessing differing dielectric constant under high frequency can be constructed,
Basis material is elastic polyurethane, is mixed by tri- kinds of raw materials of A, B, C, and the weight ratio of three kinds of components is 50：50：0.75, powder
Last added material is aluminium powder or graphite powder, and particle diameter is not more than 400 mesh.
Known two kinds of nonmetallic rubber, dielectric constant of the cement under 2GHz frequencies are respectively 3.81 and 4.67.According to electricity
, it is necessary to find a kind of alternative materials when magnetic scaling measurement theory carries out scaling measurement at different frequencies, high frequency 10GHz,
Dielectric constant under 35GHz will be with rubber, cement in low frequency 2GHz dielectric constant it is consistent, alternative materials can be according to Fig. 1
Shown step is determined：
S1, weigh in the balance and take urethane raw component A (diisocyanate) 50g, B component (hydroxyl telechelic polyester) 50g, C group
The 0.75g point (improve the catalyst of reactivity), is uniformly mixed with glass bar, be cast into a mold 10mm × 100mm ×
The blank of 100mm, cures 5h in 50 DEG C of ± 5 DEG C of baking ovens, is configured to polyurethane material.
S2, to being not added with the polyurethane material (blank polyurethane material) of powder in S1 by using short circuited waveguide method to poly- ammonia
Ester material carries out dielectric constant detection, and the results are shown in Table 1.
1 blank polyurethane material dielectric constant of table is tested
| Frequency | 10GHz | 16GHz | 35GHz |
| Dielectric constant | 3.14 | 2.88 | 2.55 |
S3, weigh urethane raw component A 50g, B component 50g, component C 0.75g, and add different proportion graphite powder or
Aluminium powder is mixed, and is configured to different dielectric constant polymer composites.
S4, by using short circuited waveguide method carry out dielectric constant detection to the polyurethane material of preparation, and draws composite material
The test curve of dielectric constant and powder additive amount, Fig. 2 are the test curve of composite material dielectric constant and graphite powder additive amount,
Fig. 3 is the test curve of composite material dielectric constant and aluminium powder additive amount.
S5, require according to the dielectric constant of setting, according to the test curve of composite material dielectric constant and powder additive amount,
Primarily determine that graphite powder or aluminium powder ratio, be configured to new polymer composite, specific formula is：
1. it is formulated 1：It is 3.81 to reach composite material dielectric constant under 10GHz, takes polyurethane material component A 50g, poly- ammonia
Ester material B component 50g, polyurethane material C components 0.75g, graphite powder D components 5.1g；
2. it is formulated 2：It is 3.81 to reach composite material dielectric constant under 35GHz, takes polyurethane material component A 50g, poly- ammonia
Ester material B component 50g, polyurethane material C components 0.75g, graphite powder D components 10.3g；
3. it is formulated 3：It is 4.67 to reach composite material dielectric constant under 10GHz, takes polyurethane material component A 50g, poly- ammonia
Ester material B component 50g, polyurethane material C components 0.75g, graphite powder D components 13.2g；
4. it is formulated 4：It is 4.67 to reach composite material dielectric constant under 10GHz, takes polyurethane material component A 50g, poly- ammonia
Ester material B component 50g, polyurethane material C components 0.75g, aluminium powder D components 0.85g.
Weighed in the balance by above-mentioned formula and take raw material, be uniformly mixed with glass bar, be cast into 10mm × 100mm in a mold
The blank of × 100mm, cures 5h in 50 DEG C of ± 5 DEG C of baking ovens.
S6, by using short circuited waveguide method to polyurethane material carry out dielectric constant detection, the results are shown in Table 2.
Dielectric constant is tested after table 2 adds graphite powder and aluminium powder
| Test parameter | Powder additive amount | 10GHz | 16GHz | 35GHz |
| It is formulated 1 dielectric constant | Graphite powder 5.1g | 3.81 | 3.31 | 3.20 |
| It is formulated 2 dielectric constants | Graphite powder 10.3g | 4.24 | 3.98 | 3.81 |
| It is formulated 3 dielectric constants | Graphite powder 13.2g | 4.67 | 4.37 | 4.11 |
| It is formulated 4 dielectric constants | Aluminium powder 0.85g | 6.25 | 5.02 | 4.67 |
According to above test result, formula 1 and formula 2 can be surveyed respectively as rubber in 10GHz and 35GHz contracting ratios
Substitute during examination, is formulated 3 and is formulated 4 substitutes that can be respectively as cement when 10GHz and 35GHz contractings are than test.
Similarly, according to needs of the contracting than test object material, the contractings of various differing dielectric constants can be configured to than material,
Nonmetallic contracting is formed to carry out contracting than material depot, replacement real goal and compare testing research.
The present invention is by the way that being modified with high intensity, high resiliency, the basis material of highly dissoluble and different proportion is added
Agent mixes, mould compacting polymer composite, obtains the dielectric constant and the property-modifying additive of the polymer composite
Relation curve between additive amount, so as to tentatively obtain the composite material of the certain dielectric constant close under high frequency, it is true to test its
Dielectric constant, additive amount is adjusted further according to relation curve, until obtaining the height consistent with certain dielectric constant under high frequency
Molecular composite material.
In conclusion the present invention by different material mixture ratios, easily preparing has different dielectric under high frequency
The contracting of constant can not only accomplish there is specific dielectric constant in high frequency than material, and with excellent intensity with it is tough
Property, ageing resistance it is good, it is very close with the physical characteristic of prototype nonmetallic materials as electromagnetism contracting than material, can meet difference
Test request is compared in the contracting of nonmetallic materials under occasion.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. there is the preparation method of certain dielectric constant composite material under a kind of high frequency, it is characterised in that comprise the steps of：
Step 1, dielectric constant blank test test is carried out to basis material；
Step 2, the property-modifying additive of some different amounts is added into basis material, is mixed, mould suppresses some first high scores
Sub- composite material；
Step 3, dielectric constant detection is carried out to the first polymer composite, establishes the first polymer composite dielectric constant
With the test curve of property-modifying additive additive amount；
Step 4, required according to the dielectric constant of different high frequency requirements, property-modifying additive is primarily determined that according to above-mentioned test curve
Usage ratio, is made the second polymer composite；
Step 5, dielectric constant test is carried out to the second polymer composite, and according to addition of the test fruit to property-modifying additive
Ratio is adjusted, the dielectric constant until reaching different high frequency requirements, obtains the adding proportion of the property-modifying additive of needs, from
And being made under high frequency has certain dielectric constant composite material.
2. there is the preparation method of certain dielectric constant composite material under high frequency as claimed in claim 1, it is characterised in that institute
The basis material stated is elastic polyurethane.
3. there is the preparation method of certain dielectric constant composite material under high frequency as claimed in claim 1, it is characterised in that institute
The property-modifying additive stated includes aluminium powder or graphite powder.
4. there is the preparation method of certain dielectric constant composite material under high frequency as claimed in claim 1, it is characterised in that step
In rapid 2, the composite material need to cure 5h in 50 DEG C of ± 5 DEG C of baking ovens.
It is 5. compound with certain dielectric constant under high frequency prepared by a kind of method in 1-4 according to claim described in any one
Material.
6. there is certain dielectric constant composite material under high frequency as claimed in claim 5, it is characterised in that the composite material exists
Dielectric constant is 3~5 under 10GHz, and the property-modifying additive is graphite powder, and addition mass fraction is 1%~20%.
7. there is certain dielectric constant composite material under high frequency as claimed in claim 6, it is characterised in that the particle diameter of graphite powder
No more than 400 mesh.
8. there is certain dielectric constant composite material under high frequency as claimed in claim 5, it is characterised in that the composite material exists
Dielectric constant is 5~30 under 10GHz, and the powder added material is aluminium powder, and addition mass fraction is 0.5%~20%.
9. there is certain dielectric constant composite material under high frequency as claimed in claim 8, it is characterised in that the particle diameter of aluminium powder is not
More than 400 mesh.
10. having the purposes of certain dielectric constant composite material under a kind of high frequency according to claim 5, its feature exists
In the composite material can be used for the electromagnetism contracting of nonmetallic materials target than test.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105304248A (en) * | 2015-11-23 | 2016-02-03 | 上海无线电设备研究所 | Preparation method of magnetic wave absorption patch shrinkage simulation composite material |
| CN106158198A (en) * | 2015-11-25 | 2016-11-23 | 上海无线电设备研究所 | A kind of wideband contracts than analog composite material compound method |
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2017
- 2017-12-06 CN CN201711278029.6A patent/CN107936533A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105304248A (en) * | 2015-11-23 | 2016-02-03 | 上海无线电设备研究所 | Preparation method of magnetic wave absorption patch shrinkage simulation composite material |
| CN106158198A (en) * | 2015-11-25 | 2016-11-23 | 上海无线电设备研究所 | A kind of wideband contracts than analog composite material compound method |
Non-Patent Citations (2)
| Title |
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| A.J.GATESMAN, ETC.: "Physical scale modeling the millimeter-wave backscattering behavior of ground clutter", 《PROC.SPIE 4370, TARGETS AND BACKGROUNDS VⅡ: CHARACTERIZATION AND REPRESENTATION》 * |
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