CN104125762A - Z type longitudinal groove type mixed metal alloy electromagnetic shielding composite material and preparation method thereof - Google Patents
Z type longitudinal groove type mixed metal alloy electromagnetic shielding composite material and preparation method thereof Download PDFInfo
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- CN104125762A CN104125762A CN201410260934.9A CN201410260934A CN104125762A CN 104125762 A CN104125762 A CN 104125762A CN 201410260934 A CN201410260934 A CN 201410260934A CN 104125762 A CN104125762 A CN 104125762A
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Abstract
The invention relates to a Z type longitudinal groove type mixed metal alloy electromagnetic shielding composite material and a preparation method thereof and belongs to the technical field of electromagnetic shielding composite materials. The electromagnetic shielding composite material is formed by clamping a layer of graphite nickel plating conductive rubber (2) between two net structure metal film layers (1), one surface of the graphite nickel plating conductive rubber (2) is provided with a row of strip-shaped grooves (4) with the cross sections being parallelograms and the tops provided with openings, and each net structure metal film layer (1) forms a net structure formed by coating a base material of a polyurethane material with a mixed metal film of aluminum, copper and silver. According to the Z type longitudinal groove type mixed metal alloy electromagnetic shielding composite material, random incident electromagnetic waves are reflected to a framework of a Z type structure, energy of the electromagnetic waves is gradually absorbed and consumed, and the Z type longitudinal groove type mixed metal alloy electromagnetic shielding composite material has excellent electromagnetic shielding effect especially under the frequency band of 11.8-13 GHz and further has the advantages of ventilation, heat dissipation, high temperature resistance and corrosion resistance.
Description
Technical field
The invention belongs to the technical field of electromagnetic shielding composite material, particularly a kind of new electromagnetic wave absorbs composite material of shielding heat radiation and preparation method thereof.The mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type of the present invention is significantly improved in structural design and processing technology, meets the desired indices in electromagnetic compatibility technology field.
Background technology
In military field, because electromagnetic wave can penetrate military equipment and components and parts, to the interference of the mass destruction weapons such as radar, communication apparatus, various guided missile and cannon, make it out of controlly cause huge loss and threat.The appearance in electromagnetism battlefield, make military affairs above develop into informationization from mechanization, the land, sea, air army are on original three dimensions, there is new military combat mode---electronic warfare, electronic warfare is as the term suggests be exactly to pass through to use the electromagnetic wave of electromagnetic equipment or equipment generation as weapon, should intactly transmit and receive electromagnetic signal, disturb again, holding transmits and receives electromagnetic signal.Electromagnetic shielding composite material can be applied in electronic warfare, plays a protective role, and stops and disturbs, prevents military secrecy leakage.The electromagnetic transmission principle proposing according to Schelkunoff, the material that electromagnetic shielding composite material is greater than reflection and projection to electromagnetic absorption can serve as military stealth material.
On medical domain, the electromagnetic wave that some Medical Devices produce, is radiated for a long time people and knows from experience the various serious diseases such as cause cancer, cardiovascular and cerebrovascular.Reasonably arrange electromagnetic shielding composite material, can make the Medical Devices absorption that produces unwanted electromagnetic wave mask harmful electromagnetic wave, reduce Expectancy.
On sphere of life, once the automobile of high-end automation is subject to after electromagnetic interference, can cause automobile vitals malfunctioning, cause casualties or property loss.Electromagnetic shielding composite material is applied on the equipment of the interference source that generates electromagnetic waves, can not only prevents that external electromagnetic wave from disturbing it, can also absorb and mask the electromagnetic wave that source device oneself produces.
For eliminating or reducing electromagnetic interference and the harm in different industries field, the kind of electromagnetic shielding composite material is increasing.Basic electromagnetic shielding composite material has conductive rubber, electrically-conducting paint, conducting resinl conductive grease, adhesive sticker aluminium strip, conductive paper conductive fabric etc., though these electromagnetic shielding composite materials are easy to use, cost performance is good, but it is not its limitation is larger, high for the electromagnetic absorption of random frequency and shield effectiveness.
The prior art close with the present invention is that ZL200310115960.4 disclosed copper-nickel-copper electromagnetic wave shielding absorbs alloy disorder for shielding net, window.Taking spongy foam plastics as base material, by the method for magnetron sputtering, make sponge shape foamed plastics substrate metal.The preparation of common disordered structure hole electromagnetic shielding material so only need be carried out simple preliminary treatment on spongy foam sheet material, then utilizes magnetron sputtering technique method metal deposition can be obtained to foam-like hole alloy network to sponge surface.Fairly simple and the metallic copper of pore structure that this method forms is easily oxidized, and causes the conductive capability on wire netting surface significantly to decline, thereby has reduced electromagnet shield effect.
Summary of the invention
The technical problem to be solved in the present invention is, designing for electromagnetic shielding material by the longitudinal slot type structure of Z-type, shielding material internal networking structure can be limited in to accurate one-dimensional square inside, due to its special construction type skeleton, there is directed reflection-absorption effect for the electromagnetic wave that enters into the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type, therefore electromagnetic absorption and shield effectiveness are improved, can meet electromagnetic shielding is had relatively high expectations and the environment higher to the relative compact of shielding material and object.
The present invention is that two kinds of different electromagnetic shielding materials form by mixed pressure complex method.In design, for meeting the conditions such as heat dissipation ventilation, the hole of shielding material seam area requires to reach minimum as far as possible, and reduces the electromagnetic wave leakage that gap produces with the higher conductive gasket of shielding properties.The mode of general perforate mainly contains order and arranges and Heterogeneous Permutation, and the screening effectiveness of low-frequency range perforate order arrangement mode is apparently higher than the mode of Heterogeneous Permutation, because the hole of Heterogeneous Permutation seam can increase the electromagnetic length of magnetic path, affects the absorbent properties of shielding material.In order to increase performance of ventilation and heat dispersion, the thermal diffusivity of the Heterogeneous Permutation mode that area is identical can be greater than order arrangement mode.Consider the factor such as screening effectiveness and ventilation of shielding material, so select with the plastic elastic web skeleton structure type polyurethane material of randomness dislocation hole crack structure and design pore-forming and stitch the version that tactic graphite nickel plating conductive rubber is composited, to expand the usage range of shielding material.
The concrete technical scheme of electromagnetic shielding composite material of the present invention is as follows.
The mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of a kind of Z-type, is composited by graphite nickel plating conductive rubber 2 and cancellated metallic diaphragm 1; It is characterized in that, described 2, one surfaces of graphite nickel plating conductive rubber have platoon leader's bar groove 4, and rectangular groove 4 cross sections are parallelogram, open top; Described cancellated metallic diaphragm 1, is taking polyurethane material as base material, and on the slotted wall of base material hole, plating has the hybrid metal film of aluminium, copper and silver to form network structure; In the middle of two-layer cancellated metallic diaphragm 1, accompany one deck graphite nickel plating conductive rubber 2 sticky and integral.
Described metallic diaphragm, can be order to be Solder for Al-Cu Joint Welding-Yin or silver-copper-aluminium be plated on the hybrid metal film on the slotted wall of base material hole, can be also that aluminium, copper and silver do not have the sequential mixed and disorderly hybrid metal film on the slotted wall of base material hole that is plated on.
The present invention, for the parallelogram elongated slot size having on graphite nickel plating conductive rubber, affects screening effectiveness to some extent according to length, width, the degree of depth, the cavity thickness of rectangular opening seam.Therefore the present invention has designed the rhombus hole slot that the length of side is 3mm.That is, described rectangular groove 4, is that the length of side is the groove of the diamond-shaped cross-section of 3mm, and the drift angle of rhombus is 30 °～60 °.
The mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type of the present invention has quasi-one-dimensional architectural feature, because Z-type is tied in the time that Electromagnetic Wave Propagation is in its vertical direction, be subject to the restriction on space, and reflect in the mixed metal alloy electromagnetic shielding composite material of Z-type knot inside electromagnetic by force, by inner metal alloy by electromagnetic wave consumption absorption.Because electromagnetic wave is after being transferred in the mixed metal alloy electromagnetic shielding composite material of Z-type structure, most of electromagnetic wave can only reflect by horizontal direction, thus claim accurate one-dimensional square to.
The mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type of the present invention is at bandwidth of operation 2～15GHz, and screening effectiveness is at 70～120dB.Best bandwidth of operation is 11.8GHz～13GHz, and when this bandwidth of operation, screening effectiveness is at 110～120dB.Screening effectiveness relatively other shielding material wants high.
The present invention on the basis of existing electromagnetic shielding composite material graphite nickel plating conductive rubber, design improved its structure, on capability of electromagnetic shielding, optimize to some extent and meet the longitudinal slot type structure of Z-type of the present invention for electromagnetic shielding material designing requirement.The graphite nickel plating conductive rubber composite electromagnetic shielding material that the graphite packing after base material adds nickel plating is prepared into taking silicon rubber, also has the features such as conductivity is high, high temperature resistant.The mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type of the present invention can apply to various different field, can, to the electro-magnetic wave absorption with incident and in internal reflection loss, electromagnetic wave be reached to minimum to the interference of object.
In the preparation, the first electromagnetic shielding material of the present invention is taking plastic elastic web skeleton structure type polyurethane as base material, by the method for magnetron sputtering plating, to mix metal alloy and be plated on substrate surface formation hybrid metal film, base material hole slotted wall and inner skeleton structure are made up of hybrid metal copper, aluminium, silver that (speciality of polyurethane material itself is exactly randomness hole crack structure, when metal ion is coated on behind the surface of polyurethane material completely, form metallic framework, be skeleton structure).Because the network structure of polyurethane surface is randomness, therefore shape, the size of its hole seam net are all also random.The second electromagnetic shielding material of the present invention is with graphite nickel plating conductive rubber, graphite nickel plating conductive rubber is existing product, the mode of being passed through fluting, being made into a line n column pitch is the rectangular channel that 2mm is of a size of 3mm × 3mm, as new base material as shown in Figure 1.By by the first electromagnetic shielding material (plastic elastic web skeleton structure type polyurethane material) after mixed plating metal alloy directly with twin-screw extrusion and solution mixing method and the second electromagnetic shielding material (graphite nickel plating conductive rubber) mixed pressure, owing to having changed original shape and angle after mixed pressure, obtain the mixed metal alloy electromagnetic shielding material of Z-type structural type as shown in Figure 2.
The preparation method's of the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type of the present invention technical scheme is summarized as follows.
The preparation method of the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of a kind of Z-type, taking polyurethane as base material, by the process of magnetron sputtering plating, the surface with porose seam that aluminium, copper, silver is plated on to base material forms hybrid metal film, make cancellated metallic diaphragm 1, described magnetron sputtering plating, to make sputtering source with aluminium, copper, silver respectively, successively be plated on substrate surface by the order of Solder for Al-Cu Joint Welding-Yin or silver-copper-aluminium and form hybrid metal film, or make sputtering source with aluminium, copper, silver simultaneously, be plated on together substrate surface and form hybrid metal film; On a surface of graphite nickel plating conductive rubber 2, output the elongated slot 3 that a row cross section is rectangle, the height of elongated slot 3 is less than the thickness of graphite nickel plating conductive rubber 2; The graphite nickel plating conductive rubber 2 that has elongated slot 3 is placed in to the middle superimposed mixed pressure of two-layer cancellated metallic diaphragm 1, making cross section is that the elongated slot 3 of rectangle is pressed into the rectangular groove 4 that cross section is parallelogram, and two-layer cancellated metallic diaphragm 1 and middle graphite nickel plating conductive rubber 2 are bonded into one.
Described graphite nickel plating conductive rubber 2, thickness can be 4～5mm; Described outputs the elongated slot 3 that a row cross section is rectangle on a surface of graphite nickel plating conductive rubber 2, the elongated slot 3 of square sectional preferably, and the foursquare length of side is 3mm; After superimposed mixed pressure, the elongated slot 3 of square sectional becomes the rectangular groove 4 of diamond-shaped cross-section, and the drift angle that is depressed into rhombus is 30 °～60 °.
The shear strength of the graphite nickel plating conductive rubber that the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type of the present invention is selected is 50ppi, and hot strength is 150psi (1.02Mpa), and specific insulation is 3.17 × 10
-3Ω cm, the bulk density of the graphite powder of graphite nickel plating conductive rubber is 1.0～1.8g/cm
3, can pass through the accumulation graphite powder of galvanoplastic.
The polyurethane base material that the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type of the present invention is selected, in the situation that having ensured base material thickness, the hole density of substrate surface is larger, prepared shielding material screening effectiveness is higher, but due to base material cannot ensure in process of production its hole density evenly, therefore the present invention selected be that thickness is that 1.5～2mm, average hole density are 620～660g/m
2elastane.
After magnetron sputtering plating forms hybrid metal film, the plasticizing of also can annealing, annealing plasticizing is constant temperature 2.5 hours at 600～800 DEG C, and polyurethane plasticizing is out of shape.
Magnetron sputtering plating process conditions can be, operating voltage 350～384V, power 1.9～2KW, sputtering time 25～90 minutes.
The present invention, according in the existing manufacture craft of electromagnetic shielding composite material, has selected the preparation method of magnetron sputtering embrane method and mixed pressure mode.Magnetron sputtering embrane method is with magnetic-controlled sputtering coating equipment, and one or more metals are plated on to material surface in the mode of high-speed low temperature.This technological requirement completes under vacuum environment, by sputtering current, sputtering voltage or sputtering power are set, under certain sputtering pressure, weighs required coating film thickness with sputtering time.Magnetron sputtering membrane process is a process of forcing metal ion to be deposited on material surface, the material that adopts this technique to obtain, and the adhesive force of its metallic diaphragm and base material is far away higher than other coating process.Mixed pressure technique is that twin-screw extrusion equipment and solution batch mixing will be extruded after different materials moulding.This technique is turned round by the stable continuation of screw rod, and uniform plasticizing melting charge equipressure is extruded equally, has met the moulding of macromolecular material and the high request of hybrid technique.
Beneficial effect of the present invention is, the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type has special Z-type slot type structure, can be by the electromagnetic wave of random incident reflection-absorption therein, electromagnetic wave constantly reflects on the skeleton of Z-type structure, absorbs gradually and consumes electromagnetic energy.In thering is good effectiveness, also there is ventilation and heat and high temperature resistant, corrosion resistant feature.The design of this electromagnetic shielding composite material can be advantageously applied on military stealthy weaponry.
Brief description of the drawings
Fig. 1 is the assembling schematic diagram of preparing the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type.
Fig. 2 is the structural representation of the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type.
Fig. 3 is graphite nickel plating sheet rubber schematic diagram.
Fig. 4 is graphite nickel plating conductive rubber and cancellated metallic diaphragm assembling schematic diagram.
Fig. 5 is the structural representation of the mixed metal alloy electromagnetic shielding composite material of the Z-type longitudinal slot type of mixed pressure after compound.
Embodiment
Embodiment 1 illustrates that in conjunction with Fig. 2 the longitudinal slot type of Z-type mixes metal alloy electromagnetic shielding composite material structure.
As shown in Figure 2,1 is cancellated metallic diaphragm, and 2 is graphite nickel plating conductive rubber, and 4 is the groove of rectangular parallelogram section.Cancellated metallic diaphragm 1 is taking polyurethane material as base material, and on the base material hole slotted wall of plasticizing, plating has the hybrid metal film of aluminium, copper and silver to form network structure.There is rectangular parallelogram section groove 4 on one of them surface, the open top of rectangular parallelogram section groove 4.The groove 4 of parallelogram section is to be pushed and formed by the square-section groove 3 carving on a face of graphite nickel plating conductive rubber 2 in preparation.
The groove 4 of preferred rectangular parallelogram section be the groove of diamond-shaped cross-section, and the drift angle of rhombus is 30 °～60 ° scopes.
Embodiment 2 illustrates the preparation method of the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type in conjunction with Fig. 2
1) plastic elastane selection thickness is 2mm, and hole seam density is relatively large; Its surface aperture density is 660g/m
2be positioned over vacuum magnetron sputtering film plating machine, respectively to its plating aluminium, copper, three kinds of metals of silver (can be also the order of silver, copper, aluminium), make it there is mixed metal alloy film in order, and be cut to 30cm × 30cm, make cancellated metallic diaphragm 1.
Metal not of the same race is adopted to different sputtering times, make every layer of metallic diaphragm thickness in 300～500nm scope.For copper sputter 25～40 minutes, can obtain the thickness of 300～500nm, for aluminium, silver-colored sputter 55～90 minutes, can obtain the thickness of 300～500nm.
2) thickness of the sheet rubber of selecting is 5mm, by chemical plating and galvanoplastic, nickel powder and graphite powder is deposited on sheet rubber successively, forms graphite nickel plating conductive rubber 2, and is cut to 30cm × 30cm.
3), by graphite nickel plating sheet rubber cutting elongated groove 3 on a side surface, the distance between elongated slot 3 adjacent edges of 3, two square sectionals of elongated slot of the rectangular square sectional that the sectional dimension that forms a line n row is 3mm × 3mm is 2mm.
4) the graphite nickel plating conductive rubber 2 of the elongated slot 3 that has square sectional is assembled in the middle of two-layer cancellated metallic diaphragm 1, by the compound mode of mixed pressure, be together with twin-screw extrusion is compound to the preparation method of solution batch mixing, form the mixed metal alloy electromagnetic shielding composite material (as shown in Figure 2) of accurate one dimension.
5) longitudinal Z-type slot type is mixed to metal alloy electromagnetic shielding composite material under screening effectiveness test environment, in the time that bandwidth of operation is 2GHz～15GHz, its screening effectiveness is about 70～110dB, and maximum can reach 120dB, and radiating effect is good.
Embodiment 3 illustrates the preparation method of the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type in conjunction with Fig. 2
1) plastic elastane selection thickness is 2mm, and hole seam density is relatively large; Its surface aperture density is 630g/m
2, be positioned over vacuum magnetron sputtering film plating machine simultaneously to its plated copper, aluminium, three kinds of metals of silver, make it there is mixed metal alloy film, and be cut to 30cm × 30cm, make cancellated metallic diaphragm 1.
For aluminium, copper, silver together sputter 60～90 minutes, can obtain the thickness of 900～1400nm.
2) select commercial graphite nickel plating conductive rubber 2, its thickness is 4mm, and the bulk density of graphite powder is 1.0～1.8g/cm
3, shear strength is 50ppi, and hot strength is 150psi (1.02Mpa), and specific insulation is 3.17 × 10
-3Ω cm.Be cut to 30cm × 30cm.
Later technical process 3), 4) and process conditions with embodiment 2.
5) longitudinal Z-type slot type is mixed to metal alloy electromagnetic shielding composite material under screening effectiveness test environment, in the time that bandwidth of operation is 2GHz～15GHz, its screening effectiveness is minimum 95dB, maximum 120dB, and radiating effect is good.
The preparation method of the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type
Summary: the hole seam combination of electromagnetic shielding material has directly affected its screening effectiveness, has limited use field.To stitch tactic graphite nickel plating conductive rubber compound by having unordered dislocation hole seam polyurethane material that arrange, plastic elastic web skeleton structure type and hole for the present invention design, forms the longitudinal slot type of Z-type and mix metal alloy electromagnetic shielding composite material.At 40M～3GHz, (2～15GHz is by later experiments, and bandwidth of operation is defined as 2-15GHz, and this bandwidth of operation application scope is space flight and aviation, HF communication, industry etc.) under frequency range, electromagnet shield effect is 90～120dB, and heat dissipation ventilation is respond well.
Keyword: electromagnetic shielding material; Hole seam; Screening effectiveness; Mixed metal.
Claims (7)
1. the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type, is composited by graphite nickel plating conductive rubber (2) and cancellated metallic diaphragm (1); It is characterized in that, described graphite nickel plating conductive rubber (2), a surface has platoon leader's bar groove (4), and rectangular groove (4) cross section is parallelogram, open top; Described cancellated metallic diaphragm (1), is taking polyurethane material as base material, and on the slotted wall of base material hole, plating has the hybrid metal film of aluminium, copper and silver to form network structure; In the middle of two-layer cancellated metallic diaphragm (1), accompany one deck graphite nickel plating conductive rubber (2) sticky and integral.
2. the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type according to claim 1, it is characterized in that, described metallic diaphragm, be order to be Solder for Al-Cu Joint Welding-Yin or silver-copper-aluminium be plated on the hybrid metal film on the slotted wall of base material hole, or aluminium, copper and silver do not have the sequential mixed and disorderly hybrid metal film on the slotted wall of base material hole that is plated on.
3. the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type according to claim 1 and 2, is characterized in that, described rectangular groove (4), is that the length of side is the groove of the diamond-shaped cross-section of 3mm, and the drift angle of rhombus is 30 °～60 °.
4. the preparation method of the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of the Z-type of a claim 1, taking polyurethane as base material, by the process of magnetron sputtering plating, by aluminium, copper, the surface that silver is plated on the porose seam of base material band forms hybrid metal film, make cancellated metallic diaphragm (1), described magnetron sputtering plating, respectively with aluminium, copper, silver is made sputtering source, successively be plated on the slotted wall of base material hole and form hybrid metal film by the order of Solder for Al-Cu Joint Welding-Yin or silver-copper-aluminium, or simultaneously with aluminium, copper, silver is made sputtering source, be plated on together on the slotted wall of base material hole and form hybrid metal film, on a surface of graphite nickel plating conductive rubber (2), output the elongated slot (3) that a row cross section is rectangle, the height of elongated slot (3) is less than the thickness of graphite nickel plating conductive rubber, the graphite nickel plating conductive rubber that has elongated slot (3) is put to (2) superimposed mixed pressure in the middle of two-layer cancellated metallic diaphragm (1), making cross section is that the elongated slot (3) of rectangle is pressed into the rectangular groove (4) that cross section is parallelogram, and two-layer cancellated metallic diaphragm (1) and middle graphite nickel plating conductive rubber (2) are bonded into one.
5. the preparation method of the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type according to claim 4, is characterized in that, described graphite nickel plating conductive rubber (2), and thickness is 4～5mm; The elongated slot (3) of outputing on graphite nickel plating conductive rubber (2), is the elongated slot (3) of square sectional, and the foursquare length of side is 3mm.
6. the preparation method of the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type according to claim 4, is characterized in that, described graphite nickel plating conductive rubber (2), and the bulk density of graphite powder is 1.0～1.8g/cm
3.
7. according to the preparation method of the mixed metal alloy electromagnetic shielding composite material of the longitudinal slot type of Z-type described in claim 4,5 or 6, it is characterized in that described polyurethane base material is that thickness is that 1.5～2mm, average hole density are 620～660g/m
2elastane.
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| CN201410260934.9A CN104125762B (en) | 2014-06-12 | 2014-06-12 | Z type longitudinal groove type mixed metal alloy electromagnetic shielding composite material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112119680A (en) * | 2018-05-16 | 2020-12-22 | 3M创新有限公司 | Shielding band for electromagnetic wave |
| CN113555974A (en) * | 2021-07-29 | 2021-10-26 | 西南交通大学 | Hybrid shielding structure for inhibiting leakage magnetic field of wireless power supply system and optimization method thereof |
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| JPH07106785A (en) * | 1993-10-05 | 1995-04-21 | Fuji Elelctrochem Co Ltd | Wave absorber for ghz band |
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| CN112119680A (en) * | 2018-05-16 | 2020-12-22 | 3M创新有限公司 | Shielding band for electromagnetic wave |
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| CN113555974A (en) * | 2021-07-29 | 2021-10-26 | 西南交通大学 | Hybrid shielding structure for inhibiting leakage magnetic field of wireless power supply system and optimization method thereof |
| CN113555974B (en) * | 2021-07-29 | 2023-10-10 | 西南交通大学 | Mixed shielding structure for inhibiting leakage magnetic field of wireless power supply system and optimization method thereof |
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