CN1855623A - Absorber for radio-frequency identificating antenna and radio-frequency identificating antenna using the same - Google Patents
Absorber for radio-frequency identificating antenna and radio-frequency identificating antenna using the same Download PDFInfo
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- CN1855623A CN1855623A CNA200610075745XA CN200610075745A CN1855623A CN 1855623 A CN1855623 A CN 1855623A CN A200610075745X A CNA200610075745X A CN A200610075745XA CN 200610075745 A CN200610075745 A CN 200610075745A CN 1855623 A CN1855623 A CN 1855623A
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/04—Screened antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
- H04B5/26—Inductive coupling using coils
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Provided are a magnetic sheet for use in a radio frequency identification (RFID) antenna, an RFID antenna including the magnetic sheet, and a method of manufacturing the magnetic sheet, in which the magnetic sheet includes an amorphous alloy selected from the group consisting of Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B and Co-Fe-Si-B. The magnetic sheet is made by laminating amorphous alloy ribbons made of an amorphous alloy between magnetic sheet layers formed of alloy powder including at least one amorphous alloy and then compression-molding the amorphous alloy ribbons, to thereby control microcrack of the amorphous alloy ribbons and enhance characteristic of an end-product. The magnetic sheet is also thin, and has an excellent magnetic permeability, and a simple manufacturing process.
Description
Technical field
The present invention relates to magnetic sheet of using in radio-frequency (RF) identification (RFID) antenna and preparation method thereof and comprise the RFID antenna of this magnetic sheet.Especially, the present invention relates to magnetic sheet of using in the RFID antenna and preparation method thereof and comprise the RFID antenna of this magnetic sheet, wherein magnetic sheet contains the formed single layer structure of alloy powder of at least a amorphous alloy for use, or the amorphous alloy belt that passes through that magnetic sheet interlayer amorphous alloy is formed is folded or the sandwich construction of compression forming.
Background technology
Recently, the radio-frequency recognition system (to call rfid system in the following text) that comprises between the transceiver of integrated circuit (IC) chip and the read/write device or carry out data communication between transceiver and reader has obtained using widely.Because rfid system uses the antenna that lays respectively in transceiver and the read/write device to carry out data communication,, transceiver and read/write device can not carry out data communication so not needing to be in contact with one another.Therefore, although between transceiver and read/write device at a distance of several centimetres to tens centimetres, they still can mutual communication.Because rfid system is contaminated or the influence of static is smaller,, comprise the control of product, logistics circulation, stock's control and access and exit control etc. in the factory so be widely used in various fields.
For example, adopted rfid system in the mobile phone.Usually, mobile phone comprises main frame and two separate unit of battery unit.Adopt at mobile phone under the situation of rfid system, contain integrated circuit (IC) chip on the contact-making surface of main frame and battery unit, the label antenna and the main frame at the battery unit back side do not contact with each other, and battery and main frame are in contact with one another.
The label antenna and the battery that constitute battery unit can be integrated in the box of being made by plastic or other material.Here, the IC chip of main frame and the label antenna in the battery unit play the effect of transceiver in the rfid system, and the reader of itself and mobile phone outside carries out data communication.In more detail, mainly use 13.56MHz or 135KHz or during with lower frequency at the RFID mobile phone, special under inductive mode the antenna of reader mainly use the frequency of 13.56MHz to produce the sine wave of radio band.Therefore when energy was sent to label antenna, when promptly being sent to transceiver antennas by reader antenna, transceiver was activated, and reader receives the data that label antenna sends.
In above-mentioned frequency domain rfid system, communicate by letter mutually by the inductive electromagnetic coupling of transformer pattern.Label antenna can be made into the right-angle plane spiral inductor for this reason.In this case, finish communication by the LC resonance of antenna, wherein resonance frequency is by the electric capacity decision of the induction coefficient and the capacitor of inductance.Usually it is very important antiresonant circuit being set in transceiver, and wherein the impedance of transceiver reaches the maximum voltage that obtains maximum with the electric current by minimum on the LC resonance frequency.
Fig. 1 is the schematic diagram of rfid system, comprises reader 100 and transceiver 200, by inducing inductive mode realization data communication between the two.Reader 100 comprises and is used to produce 13.56MHz electromagnetic oscillator 1, electric capacity 2, resistance 3 and coil 8.In transceiver 200, the electromagnetic field 6 that the coil 8 of reader 100 generates arrives the RFID aerial coil 7 that links to each other with transceiver 200, thereby produces induced voltage on coil 7.Induced voltage provides direct current (DC) voltage by the electric capacity 2 in parallel with RFID aerial coil 7 with RFID aerial coil 7 diode in series 4 for RFID chip 5.
In case for RFID chip 5 provides dc voltage, transceiver 200 just is activated, by the id information of RFID aerial coil 7 in reader 100 transmission RFID chips 5.
In this case, the induced voltage in the label antenna is by Faraday's law and the decision of distracted law now.Therefore signal voltage is high more good more, because the high more magnetic flux that passes transceiver antenna coils of voltage is just big more.Because the soft magnetic material in the transceiver antenna coils is many, it is big that the permeability of material becomes, and then magnetic flux also becomes big.Especially, because rfid system carries out in essence is contactless data communication, be necessary to use absorbing sheet that high permeability magnetic material makes to focus on the radio frequency electromagnetic that produces in the antenna that reads of label antenna.
The induction coefficient of transceiver antenna coils commonly used is directly proportional with the permeability of employed magnetic material.In communication process, when the induction coefficient of transceiver antennas became big, also strain was big mutually for the induced voltage that is directly proportional with the transceiver antennas induction coefficient.Therefore if in label antenna, use the material of the magnetic material of high permeability, then not only can increase the distance of data communication, but also can reduce the error rate of data as absorbing sheet.
The magnetic material of mobile phone RFID antenna absorbing sheet is made sheet by the ferrite and the mixed with resin that comprise Mn-Zn family oxide or Ni-Zn family oxide usually in the prior art.The LC resonant circuit is very difficult tuning in the prior art, produces serious deviation because these ferrite variable thickness cause the induction coefficient that causes transceiver antennas.Further, the inconsistent meeting that exceeds error range in power brick when magnetic sheet is installed on the thickness causes the difficulty installed, and causes the formation of binary data in the data transmission procedure and transmission to produce mistake, thereby makes fraction defective very high.
Further, prior mobile phone all comprises high-end functions such as recreation, video communication, internet function and camera.Thereby power consumption also correspondingly improves.Thereby be necessary to make battery capacity big as much as possible.Further, equipment is just becoming more and more littler and more and more thinner.But at the RFID antenna absorbing sheet thickness that ferrite is made is 0.35mm or more hour, and the induction coefficient of transceiver antennas that is used for RFID communication is very low.In this case, communication distance greatly shortens, and the quality of communication function is reduced.Therefore, press for a kind of new material of exploitation.
On the other hand, the Monimax powder (MPP) that has the permalloy of good soft magnet performance or contain molybdenum (Mo) also can be used as the magnetic material of mobile phone RFID antenna absorbing sheet.Dilval or MPP compare its soft magnet performance with ferrite more outstanding, thereby can be used as the absorbing sheet that thickness is low to moderate the mobile phone RFID antenna of 0.2mm.Yet because spherical powder need be crushed to nanometer scale and pave, so the manufacturing process more complicated, material cost is higher.
As mentioned above, the dilval that uses ferrite in the prior art or contain molybdenum is as magnetic material, and then how process condition finally all forms spherulite.Therefore need carry out that fine grinding is tiled again and wait complicated technology, with from ferrite or contain Monimax generation 0.2mm or thinner absorbing sheet.In addition, because there is the problem that causes the net sectional area of the material that can't guarantee exhibit magnetic properties because of thinner thickness in current material, so improving existence limitation on the required induction coefficient of assurance RFID communication distance.And, because current material is in uneven thickness in process of production, also make the deviation of induction coefficient serious.
In addition, United States Patent (USP) 6,887,412 have disclosed a kind of composite magnetic sheet of suppressing electromagnetic interference and preparation method thereof that can be used for.The sheet soft magnetic powder of having eliminated stress deformation by annealing mixes with adhesive and solvent and prepares paste mixture, forms film shape then, removes solvent again, thereby forms magnetic sheet.
But the magnetic sheet that this soft powder is made does not have good feature as the absorber that is used for RFID, and the thickness of magnetic sheet is still too thick for the application of RFID antenna.
The inventor recognizes, be selected from Fe-Si-B in utilization, Fe-Si-B-Cu-Nb, under the situation of the amorphous alloy of any composition of Fe-Zr-B and Co-Fe-Si-B, this alloy band can manufacture thickness 0.03mm or thinner form of film usually, compare existing sheet metal, can low-cost and minimum step make thickness at 0.35mm or following magnetic sheet with uniform thickness.
In addition, when making magnetic sheet with above-mentioned amorphous alloy, its saturation flux density 0.57T-1.6T is also far above the 0.45T that has the ferrite manufactured goods now, even its permeability is also very high under the situation of very thin thickness.Therefore the magnetic flux of RFID communication modulation can more effectively concentrate on the transceiver antenna coils.0.9GHz communicate by letter irrelevantly with RFID with the electromagnetic wave of 1.8GHz frequency range, in addition, to compare with iron content hydrochlorate sheet, thousands of megahertzes (GHz) harmonic component of the standard traffic electromagnetic wave band when not having metal level in the mobile communication process can effectively be tackled.In this case can be by on the absorbing sheet of the RFID of mobile devices such as mobile phone antenna, using magnetic sheet to solve a question at the front.
Summary of the invention
Therefore, one of purpose of the present invention is for the RFID antenna provides a kind of magnetic sheet that comprises the amorphous alloy of mentioned component, and the RFID antenna that comprises this magnetic sheet.
For addressing the above problem the method that another object of the present invention provides the magnetic sheet that is used for the RFID antenna, the RFID antenna that comprises this magnetic sheet and makes this magnetic sheet.Wherein by stacked amorphous alloy band between the magnetic sheet layer of being made by the alloy powder that comprises at least a amorphous alloy, make magnetic sheet through compression forming again, to form the simply thin sandwich construction of manufacture craft, it has good permeability.
For realizing above-mentioned purpose of the present invention, the magnetic sheet of the RFID of being used for antenna of the present invention is characterised in that, comprises from Fe-Si-B Fe-Si-B-Cu-Nb, at least a amorphous alloy of selecting among Fe-Zr-B and the Co-Fe-Si-B.
In addition, according to a further aspect in the invention, by to containing Fe-Si-B, Fe-Si-B-Cu-Nb, at least a amorphous alloy heat treatment among Fe-Zr-B and the Co-Fe-Si-B obtains alloy, to be formed for the magnetic sheet of RFID antenna.
Magnetic sheet of the present invention can obtain by being folded by the above-mentioned amorphous alloy powder of forming, resin and the above-mentioned magnetic sheet layer of forming and the amorphous alloy belt of tearing.Also can in magnetic sheet, mix two kinds or the above alloy that comprises in the mentioned component.
According to another aspect of the invention, utilization comprises at least a amorphous alloy powder in the amorphous alloy of Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B and Co-Fe-Si-B and can be made into the magnetic sheet that is used for the RFID antenna as the resin of adhesive and the mixture of amorphous alloy powder, is beneficial to make sheet.
Amorphous alloy powder and adhesive resin mix with 5: 1 to 9: 1 weight ratio.
In accordance with a further aspect of the present invention, a kind of manufacture method of magnetic sheet of the RFID of being used for antenna is provided, comprises the steps: and to contain the amorphous alloy powder of at least a amorphous alloy of from Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B and Co-Fe-Si-B, selecting and as the mixed with resin of adhesive; Mixture is coated on the substrate of form of film and makes it dry, to obtain dry magnetic sheet.
According to a further aspect in the invention, provide a kind of magnetic sheet of the RFID of being used for antenna, it has sandwich construction.The magnetic sheet of this sandwich construction comprises: the first and second magnetic sheet layers of being made by at least a amorphous alloy powder in the amorphous alloy that contains Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B and Co-Fe-Si-B; And comprise at least a described amorphous alloy and be layered in the first amorphous alloy band between the first and second magnetic sheet layers.
Preferably, the magnetic sheet that is used for the RFID antenna further comprises: be layered in the first and second magnetic sheet layers any one the surface, by a kind of second amorphous alloy band of making of above-mentioned amorphous alloy; And the 3rd magnetic sheet layer that is layered in this second amorphous alloy belt surface, makes by at least a amorphous alloy powder that contains in the above-mentioned amorphous alloy.
In this case, because be layered in the generation that rolling or the pressure of amorphous alloy band by sheet between the mixing tab causes fine crack, thereby reduced loss, thereby the defective on the amorphous alloy band frequency characteristic improved, and utilizes existing amorphous alloy band to carry out the complicated processing of tearing.In this case, can make battery with the box of its same thickness in occupy bigger space or make the thickness of battery case thin especially because the induction coefficient that RFID signal post needs can reach effectively.
According to a further aspect in the invention, the manufacture method that is used for the magnetic sheet of RFID comprises the steps: with the amorphous alloy powder preparation first and second magnetic sheet layers that contain at least a amorphous alloy that is selected from Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B and Co-Fe-Si-B; With a kind of preparation first amorphous alloy band in the described amorphous alloy; And the first amorphous alloy belt is stacked between the first and second magnetic sheet layers, and stacked multilayer magnetic sheet layer is carried out compression forming handle, to increase its relative density, on the first amorphous alloy band, form microcrack simultaneously.
The manufacture method of the magnetic sheet of the above-mentioned RFID of being used for further comprises: prepare the second amorphous alloy band with a kind of amorphous alloy, make the 3rd magnetic sheet layer with the alloy powder that contains at least a above-mentioned amorphous alloy; And before stacked magnetic sheet layer is rolling, the second amorphous alloy belt is stacked in the first and second magnetic sheet layers on the surface of any one, simultaneously the 3rd magnetic sheet is stacked on the surface of the second amorphous alloy band layer by layer.
In addition, the step that stacked multilayer magnetic sheet layer is carried out compression forming can adopt that heat is rolled, hot pressing, cold breakdown and cold pressing in one.
Preferably, amorphous alloy carried out under 300 ℃ to 600 ℃ temperature ten hours or the heat treatment of shorter time, so that its particle size arrives nanometer (nm) magnitude.
The multilayer magnetic sheet can be made into 0.2mm or thinner thin slice.
Further, can make the magnetic sheet that is used for RFID, this magnetic sheet comprises: a plurality of magnetic sheet layers, make with the amorphous alloy powder that contains at least a amorphous alloy that is selected among Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B and the Co-Fe-Si-B; And a plurality ofly make and at the stacked amorphous alloy band of a plurality of magnetic sheet interlayers by at least a above-mentioned amorphous alloy.
Further, the present invention also comprises a kind of RFID antenna, comprise: the magnetic sheet of sandwich construction, comprise with containing a plurality of magnetic sheet layers that the amorphous alloy powder that is selected from least a amorphous alloy among Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B and the Co-Fe-Si-B is made, and a plurality of that make by at least a above-mentioned amorphous alloy and at the stacked amorphous alloy band of a plurality of magnetic sheet interlayers; The insulating barrier that on the magnetic sheet surface, forms; And use the pattern of the aerial coil that electric conducting material forms at the surface of insulating layer composition.
In addition, also provide the RFID equipment that contains RFID antenna of the present invention.
The magnetic sheet that the present invention is used for the RFID antenna can be made into uniform thin slice, and its thickness can be 0.35mm or littler.Therefore, the deviation of its induction coefficient is little.Simultaneously, even magnetic sheet is thinner, its permeability is also fine.Therefore, if this magnetic sheet that is used for the RFID antenna is used for the antenna absorbing sheet of RFID transceiver, under electromagnetic 13.56MHz that RFID signal post needs or 135KHz or lower frequency of operation, can show the performance of high induction coefficient.
Therefore, be installed on the equipment with radio frequency recognition function as if the magnetic sheet that the present invention is used for the RFID antenna, then the mistake in the formation of data and the transmission can be minimized.In addition, the equipment that comprises magnetic sheet of the present invention can be made thinlyyer, and weight is lighter.In addition, because being installed in magnetic sheet that the present invention on the equipment is used for the RFID antenna can absorb the electromagnetic wave of thousands of megahertzes (GHz) wave band that circuit produces and need not independent intercept layer, although therefore do not have independent conductive sheet on the magnetic sheet, it also can realize the effect of noise attentuation to a certain extent.The magnetic sheet that is used for the RFID antenna of the present invention is very useful, in the time of in mobile devices such as mobile phone.
Further, be sandwich construction though the present invention is used for the magnetic sheet of RFID antenna, by compression-molding method, but low-cost production and have uniform 0.2mm or thinner thickness, and have high rate of finished products.Further,, also have high induction coefficient, and the induction coefficient deviation is low and have a good permeability even the present invention is used for the magnetic sheet thinner thickness of RFID antenna.Therefore when the antenna magnetic sheet is used on the RFID transceiver antennas, under the electromagnetic 13.56MHz of RFID signal post need or 135KHz or lower frequency of operation, can show the performance of high induction coefficient.
Description of drawings
The above and other objects and advantages of the present invention will be carried out more detailed description by embodiment with reference to the accompanying drawings, wherein:
Fig. 1 is the circuit diagram of the rfid system of induction coupled mode;
Fig. 2 comprises the oblique view of being made the RFID antenna of the magnetic sheet that is used for the single layer structure absorbing sheet among the embodiment 1 by the amorphous alloy powder;
Fig. 2 B is the profile of A-A ' along the line among Fig. 2 A;
Fig. 3 A is the oblique view that comprises the RFID antenna of the magnetic sheet that embodiment 2 stacks formation by magnetic sheet layer that the amorphous alloy powder is made and longitudinal joint type amorphous alloy belt;
Fig. 3 B is the profile of A-A ' along the line among Fig. 3 A;
Fig. 3 C to Fig. 3 E is respectively the section of structure of RFID antenna that comprises the magnetic sheet of the improvement that embodiment 2 obtains by stacked amorphous alloy powder and longitudinal joint type amorphous alloy band;
Fig. 4 A and Fig. 4 B comprise the structure oblique view of radio frequency discrimination RFID antenna that embodiment 3 is used for the longitudinal joint type amorphous alloy band of absorbing sheet;
Fig. 5 A is the structure oblique view that comprises the RFID antenna of the magnetic sheet layer that magnetic sheet layer that embodiment 4 forms by stacked amorphous alloy powder and longitudinal joint type amorphous alloy band obtain;
Fig. 5 B is the profile that obtains along C-C ' line among Fig. 5 A;
Fig. 5 C is the section of structure of RFID antenna that comprises the magnetic sheet of the improvement that embodiment 4 obtains by stacked amorphous alloy powder and longitudinal joint type amorphous alloy band;
Fig. 6 is the generalized section of battery of mobile phone that comprises the RFID antenna of embodiment 1;
Fig. 7 is the flow chart of manufacture method that is used for the magnetic sheet of RFID antenna among the embodiment 5;
Fig. 8 is the schematic diagram of rolling process of the mixed layer of moulding among Fig. 7;
Fig. 9 is the generalized section of pressing mold process that is used for the magnetic sheet of RFID antenna among the embodiment 5;
Figure 10 is the profile of magnetic sheet that is used for the improvement of RFID antenna among the embodiment 6;
The RFID antenna that Figure 11 is to use the magnetic sheet that is used for the RFID antenna among the embodiment 5 to make is installed to the profile on the battery of mobile telephone box; And
Figure 12 A and 12B are respectively the profiles of the magnetic sheet of pressurized and casting mold and pressurized and casting mold not.
Embodiment
Below with reference to the accompanying drawings to the magnetic sheet that is used for the RFID antenna among the embodiment, its manufacture method, and the radio frequency discrimination RFID antenna that comprises this magnetic sheet is described in detail.
Known ferroalloy and amorphous alloy can be used as soft magnetic material.The magnetic sheet that is used for the absorbing sheet of RFID among the present invention can be made with a kind of formed amorphous alloy that is selected from ferroalloys such as Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B and Co-Fe-Si-B.Can solve the problems of the prior art thus.Below this is described in detail.
Under situation about having used, can produce 0.35mm or thinner uniform magnetic sheet by the amorphous alloy that is selected from a kind of component preparation among Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B and the Co-Fe-Si-B.Use ferrite or contain under the situation of permalloy as magnetic material in prior art, no matter how process conditions all can generate the spherulite structure.Therefore the complicated technology then paved as attritive powderization be need carry out and 0.35mm or thinner magnetic sheet made with the permalloy that uses ferrite or contain molybdenum.In addition, in the prior art,, be used to therefore to guarantee that the raising of induction coefficient of RFID communication distance is just very limited along with more and more thinner its of material can't guarantee the net sectional area of exhibit magnetic properties characteristic.In addition, existing material became uneven in preparation process also can make the induction coefficient deviation serious.
Yet alloy of the present invention is noncrystalline band shape, makes it be easy to make 0.35mm or thinner thin slice.Uniformity on the sheet thickness is also more easy to control in addition.Therefore the present invention uses the absorbing sheet of uniform thin magnetic plate as the RFID antenna, makes the induction coefficient minimum deviation, also helps the tuning of LC resonant circuit.Wrong phenomenon in the data interaction communication process in binary code generates and transmits also greatly reduces.The production process of magnetic sheet is also comparatively simple in addition, low production cost.
In addition, the magnetic sheet material must comprise independent metal level to tackle the outside irrelevant electromagnetic wave of communicating by letter with RFID that generates in the prior art, and the amorphous alloy among the present invention not only can make 13.56MHz or 135KHz or more low-frequency induced electricity magnetic wave concentrate on the tag antenna coil, also can tackle the electromagnetic wave of thousands of megahertzes (GHz) frequency range of communicating by letter irrelevant with RFID simultaneously.Therefore use amorphous alloy of the present invention to make when being used for the magnetic sheet of RFID antenna, need not to comprise the separators such as metal level that are used to tackle external electromagnetic waves.
The amorphous alloy that comprises the composition among the present invention can pass through to mix the material composition of alloy of the present invention again with 10
6The speed of K/s cooling is fast made.Yet can use the method for any making amorphous alloy and be not limited only to above-mentioned method.
Preferably, noncrystalline Fe-Si-B alloy is made by the Fe of 70-90% atomic ratio and the Si and the B of 10-30% atomic ratio.Along with the ratio of metals such as Fe uprises, also the phase strain is big for saturation flux density, but when the ratio of Fe is too high, is difficult to form alloy.Therefore the atomic ratio of preferred Fe is 70-90% among the present invention.In addition, the total atom of Si and B is best than the noncrystalline formation ability of alloy when the 10-30%.In order to prevent corrosion, can in the basis of alloy, add the corrosion-resistant material of several atomic percents, as Cr etc.
In addition, preferably, Fe-Si-B-Cu-Nb alloy of the present invention comprises the Fe of 73-80% atomic ratio, the Si of 1-5% atomic ratio and B.In this composition range, make banded amorphous alloy very easily forms nanometer scale by heat treatment described later particle.
Preferably, Fe-Zr-B alloy of the present invention comprises the Fe of 85-93% atomic ratio, the B of the Zr of 5-10% atomic ratio and 2-5% atomic ratio.In this composition range, Fe-Zr-B very easily separates out the particle of nanometer scale by heat treatment described later.
Preferably, Co-Fe-Si-B alloy of the present invention comprises the Co of 71-85% atomic ratio, the Si of 12-21% atomic ratio and B.If necessary, can in the Co-Fe-Si-B alloy, add materials such as Mo, the Cr of several atomic percents and Ni.Here the atomic ratio of preferred Cr and Ni is 2-7%.Peakflux density was also lower when Co content was low, but permeability is very high.Therefore, the content of Co is preferably low to realize high induction coefficient.Yet because the magnetic bias that DC (direct current) electric current causes can produce very big change down, so the Co composition still need be used about the Co composition.
For example, but the present invention is used for the magnetic sheet following steps for manufacturing of RFID antenna.Earlier Fe-B or Co-B are mixed to be selected from Fe-Si-B as being used to form, Fe-Si-B-Cu-Nb, the parent material of a kind of composition among Fe-Zr-B and the Co-Fe-Si-B.Here with said mixture optionally with Si, Cu, Nb, Zr, Mo, raw material such as Cr and Ni mix to cooperate mentioned component, use Efco-Northrup furnace that the mixture that obtains is made the high-temperature metal molten mass afterwards.Here the raw material of Tian Jiaing can be any in powder, particle and the bulk.
Pass through with 10 afterwards
6K/s or faster speed are cooled off the banded amorphous alloy that this molten-castings obtains the continuous film shape., utilize breaking method such as well known in the art ball milling amorphous alloy belt grinding become powder, to generate the amorphous alloy powder thereafter.The amorphous alloy powder is a film like, is plate shaped.Also can adopt circle, rectangle and aciculiform rather than plate shaped.The shape of alloy powder of the present invention is not subjected to any restriction.
Amorphous alloy powder with above-mentioned generation mixes with adhesive resin afterwards.If the needs of control viscosity are arranged here, can in the mixture of amorphous alloy powder and adhesive resin, add ethene alcohol, alcohol or other volatile solvent.Can use rubber among the present invention, polyimides, polyamide, polyurethane, silicon, phenol resin etc. are as adhesive resin.But the present invention is not limited to this.Preferably, the mixed proportion of amorphous alloy powder and resin is 5: 1 to 9: 1.If mixed proportion at 5: 1 or more hour, is difficult to reach the induction coefficient that RFID signal post needs.If mixed proportion was at 9: 1 or be difficult to make magnetic sheet when bigger.Mixed powder covers on the base material with the form of film with 0.35mm or littler thickness and is dry.Base material and divided thin film are to generate magnetic sheet afterwards.Magnetic sheet finally is cut into the required size of antenna to become the magnetic sheet of RFID antenna of the present invention.
Manufacturing process at the magnetic sheet that is used for RFID antenna of the present invention, the amorphous alloy powder that amorphous alloy band of the present invention or amorphous alloy belt grinding obtain through Overheating Treatment to improve its magnetic, or grind to nano-scale its particle is little, be preferably 10nm, to obtain good magnetic properties.When utilizing the alloy of making by this way to make the magnetic sheet of RFID antenna of the present invention, the high frequency characteristics of magnetic sheet can be improved.Preferably, heat treatment of the present invention was carried out at most 10 hours in 300 ℃ to 600 ℃ temperature ranges.
Shown in Fig. 2 A to Fig. 5 C, RFID antenna 30 of the present invention comprises aerial coil 9 and is used for the magnetic sheet of radio-frequency (RF) identification (RFID) antenna.Here RFID antenna 30 of the present invention can be included in by plastics, and PBT (polybutene phthalic acid fat far away) is in PET (polyethylene phthalic acid fat far away) or the insulation booth that similarly other injection moulding materials are made.
Shown in Fig. 2 A, the aerial coil 9 of RFID antenna 30 of the present invention can be Scrawl on horizontal plane.The vortex of aerial coil 9 is a rectangle among Fig. 2 A.But the spiral of aerial coil 9 can be circular, rectangle and the circular shapes such as mixing shape that obtain of mixing.Can use the scale copper that is covered with resin on it to generate thin slice at the aerial coil that is used for transceiver.Preferably, insulating barrier 10 thickness of formation aerial coil 9 of the present invention are 0.15mm or thinner.
The magnetic sheet that is used for RFID antenna of the present invention can be formed by the magnetic sheet layer 12 of the single layer structure that is formed by amorphous alloy powder and mixed with resin according to embodiment 1, shown in Fig. 2 A and Fig. 2 B.
In the RFID of the embodiment of the invention 1 antenna 30, the aerial coil 9 that forms on insulating barrier 10 integrates by articulamentum 11 with the magnetic sheet layer 12 of single layer structure.
Available two-sided tape forms the articulamentum 11 that connects aerial coil 9 and be used as the magnetic sheet layer 12 of absorbing sheet among the present invention.Yet the present invention is not limited to this, can adopt the whole bag of tricks to connect aerial coil and magnetic sheet layer in the scope that does not influence the RFID antenna performance.
In addition, the flexible thin printed circuit board (PCB) that is covered with resin in use is when forming aerial coil 9, and the magnetic sheet that magnetic sheet, especially alloy band are made need not to add adhesive and can be bonded together with printed circuit board (PCB).The flexible thin printed circuit board (PCB) that is covered with resin refers to subsclerotic prepreg resin and covers on the two sides of insulating barrier, wherein insulating barrier preferably thickness be 0.15mm or littler, and make by phenol or polyimides.
In addition, the magnetic sheet in the RFID antenna of the present invention can be made by stacked magnetic sheet layer 12 and the longitudinal joint type amorphous alloy band of being made by amorphous alloy powder and mixed with resin 13,14 and 16, shown in the embodiment 4 of the embodiment 2 of Fig. 3 A to 3E and Fig. 5 A to 5C.Here, as shown in the figure, longitudinal joint type amorphous alloy band 13,14 and 16 can have multiple shape.
Fig. 3 A is the oblique view that the embodiment of the invention 2 comprises the RFID antenna of magnetic sheet layer that the amorphous alloy powder is made and the folded magnetic sheet that obtains of longitudinal joint type amorphous alloy belt.Fig. 3 B is along the profile of B-B ' line among Fig. 3 A.
In the RFID antenna 31 of the embodiment 2 shown in Fig. 3 A and Fig. 3 B, for assembling the radio frequency electromagnetic in the aerial coil 9 that reader antenna among the embodiment 1 is transmitted into antenna 30, can be outside the antenna 30 of the foregoing description 1, stacked a plurality of 0.3mm or thinner amorphous alloy band on the lower surface of the magnetic sheet layer 12 that the amorphous alloy powder is made.In amorphous alloy band 13, a plurality of width be 10mm or narrower band with longitudinal joint seam with preset space length 15 parallel longitudinals be arranged on the length direction of RFID antenna 31.
Form thereon and insert articulamentum 11 between the insulating barrier 10 of aerial coil 9 and the magnetic sheet layer 12.In addition, the lower surface of magnetic sheet layer 12 is fixed on the battery case, when being installed in the battery case at battery with another articulamentum 11 as shown in Figure 6.
Structure shown in Fig. 3 C is the improvement of embodiment 2 among Fig. 3 A and Fig. 3 B.The structural arrangements of Fig. 3 C is a plurality of longitudinal joint type alloy bands 14 are placed in articulamentum 11 side by side with the short direction of the length of RFID transceiver antennas 31 a lower area.Fig. 3 D is another improvement of embodiment 2, the lower area that is placed in articulamentum 11 that wherein a plurality of longitudinal joint type alloy bands 16 do not interspace.In the improvement example of Fig. 3 E, a plurality of longitudinal joint type alloy bands 13 and 14 are placed mutual vertically.
Simultaneously, among the embodiment 3 shown in Fig. 4 A and Fig. 4 B RFID antenna 32 for a plurality of longitudinal joint type alloy bands 17 by 19 structures of lower area that are placed on the insulating barrier 10 of aerial coil 9 lower surfaces at interval.
In addition among the embodiment 4 shown in Fig. 5 A to Fig. 5 C, in the lower area of the insulating barrier 10 that a plurality of longitudinal joint type alloy bands 17 are placed on aerial coil 9 lower surfaces with the length and the Width of antenna 33.Magnetic sheet layer 12 is by the lower area of articulamentum 11 attached to a plurality of longitudinal joint type alloy bands 17.
The induction coefficient of antenna 31 is identical in essence among antenna 33 among the embodiment 4 shown in Fig. 5 A and the embodiment 2 shown in Fig. 3 A.
In embodiment 3 and embodiment 4, after making the amorphous alloy band form longitudinal joint, it is placed on the flexible substrate that is covered with resin, to connect alloy band 17, afterwards its etching is formed pattern and can be used as alloy band 17 and 18 is connected to the method on the insulating barrier 10 of aerial coil 9 in the method in broadband that maybe connection is comprised insulating barrier 10 sizes of aerial coil 9 by hot pressing thereafter.The method of adhering to here with composition is not limited in this.
As mentioned above, because the antenna 30-33 that obtains by stacked magnetic sheet layer 12 and a plurality of different types of longitudinal joint type alloy band 13,14,16,17 and 18 can obtain the induction coefficient that RFID signal post needs effectively, be arranged in the space of the battery of the battery case of its same thickness and can be expanded, or battery case can be made into ultra-thin thickness.
Can obtain the method for the following raising performance relevant thus with battery case thickness factor.Comprise: be used for improving the dielectric constant of the material in the battery of given thickness battery case and the method for expanded capacitor amount; Reduce the thickness of articulamentum 11 such as bonding two-sided tape, to form 0.1mm, the method for the existing thin thickness of 0.03mm or 0.018mm geometric ratio; Reduce the thickness of magnetic sheet 12,, keep the method for performance under the existing thickness with when forming than the thinner thickness of existing 0.35-0.4mm; Reduce the thickness of insulating barrier 10 in the printed circuit board (PCB), to form the method for the insulating barrier thinner than existing 0.17-0.2mm; And the soldering paste of using silver higher than copper conductivity (Ag) or argentiferous handles the material of aerial coil 9 etc., reduces copper sheet thickness, to form the method for the thickness thinner than existing copper sheet.
Also can use the method for two or more combination in the said method.After using these methods, the battery case of comparable same thickness of operating period that comprises the battery case of the antenna that is used for the RFID transceiver prolongs 20-30%.
RFID antenna of the present invention can be installed in the equipment that uses radio-frequency (RF) identification (RFID) system.This RFID antenna can be used in read/write device and the transceiver, but is not limited in the equipment that uses radio-frequency (RF) identification (RFID) system.Especially, RFID antenna of the present invention comprises thin magnetic plate.Therefore, when the RFID antenna being installed in the mobile device with wireless identification function, RFID antenna of the present invention will be very useful.RFID antenna of the present invention can be installed in the battery case of mobile phone, as shown in Figure 6.
Fig. 6 is the generalized section of the battery of mobile phone of radio-frequency (RF) identification (RFID) antenna that comprises the embodiment of the invention 1.The battery of mobile phone 25 that the RFID antenna is housed comprises and battery 20 on battery case 21 and face that main body in 22 contacts.Magnetic sheet 12 and the insulating barrier 10 that has aerial coil 9 above it are layered in the top of battery 20 by insulating barrier 11.
As mentioned above, RFID antenna of the present invention can be by being applied in PDA (personal digital assistant) with the similar method of the battery of mobile phone, notebook computer, and transportation card is in the plurality of devices such as credit card and gate inhibition's card.
Fig. 7 is the schematic flow diagram of manufacture method that is used for the multilayer magnetic sheet of RFID antenna in the embodiment of the invention 5.
The multilayer magnetic sheet that is used for the RFID antenna in the embodiment of the invention 5 is made by the following method.Fe-B or Co-B are mixed as original material, to obtain Fe-Si-B, Fe-Si-B-Cu-Nb, a kind of composition among Fe-Zr-B and the Co-Fe-Si-B.Here can be with Si, Cu, Nb, Zr, Mo, raw material such as Cr and Ni optionally mix according to a certain ratio with Fe-B or Co-B, utilize Efco-Northrup furnace that the mixture that obtains is made the high-temperature metal molten mass afterwards.Here the raw material of Tian Jiaing can be powder, particle or bulk.Afterwards by extruding and with 10
6K/s or faster speed are cooled off this molten mass fast and are obtained banded alloy, i.e. amorphous alloy band (S1).Here the Dai Zhuan meaning is a continuous films.
Thereafter, banded alloy is pulverized by the methods of grinding such as ball milling that those skilled in the art know, to obtain alloy powder (S2).This alloy powder is a film morphology.It also can be plate shaped, circular, rectangle or aciculiform.Alloy powder of the present invention is not limited to above-mentioned shape.
Can heat-treat the powder that inserts above-mentioned gained or the amorphous alloy band between the sheet, the stress when grinding amorphous alloy to eliminate is to obtain good magnetic characteristic.Particularly in the amorphous alloy that Fe-Si-B-Cu-Nb makes, grind to nano-scale particle is little, be preferably 10nm.When making the magnetic sheet of RFID antenna of the present invention in this way, its high frequency characteristics is improved.Heat treatment of the present invention is no more than 10 hours in 300 ℃ to 600 ℃ temperature ranges.
Afterwards, with above-mentioned alloyed powder that makes and mixed with resin.Control viscosity if desired, ethene alcohol, volatile solvents such as alcohol and toluene can be added into the mixed alloy powder of adhesive resin in, and mix (S3) with it.Rubber, polyimides, polyamide, polyurethane, phenolic resins and acrylic acid etc. all can be used as the resin among the present invention.But the present invention is not limited to this.Preferably, the mixed proportion of alloy powder and resin is between 5: 1 to 9: 1.This mixture can be coated with into 0.5mm or thinner film and drying.
Fig. 8 is the schematic diagram of the rolling process of mixing tab among Fig. 7.The mixing tab 44 of dried amorphous alloy powder 44a and resin 44b (is called " mixing tab " again, the compression molding rod 43 that forms by a pair of top roll 41 and lower roll 42 continuously down together), formation is through the magnetic sheet layer 45 after once rolling, thereby improve the density of amorphous alloy powder, (S4) as shown in Figure 5.
The method of rolling mixing tab can adopt that heat is rolled, hot pressing, cold breakdown or cold pressing in any.Heat is rolled and can be carried out at 70 ℃.
Fig. 9 is the generalized section of pressing mold process that is used for the magnetic sheet of radio-frequency (RF) identification (RFID) antenna among the embodiment 5.At first, amorphous alloy band 46 by roll extrusion or laminating method be laminated to a pair of after once rolling magnetic sheet layer 45a and 45b between (S6).
Thereafter, stacked multilayer tablet 47 carries out the reroll forming process under the identical cold or heat condition with the first compression molding process, to obtain comprising the magnetic sheet 50 (S7) of sandwich construction.
The magnetic sheet 50 of the foregoing description 1 for comprise a pair of after once rolling magnetic sheet layer 45a and the three-decker of 45b and amorphous alloy band 46.Magnetic sheet 50 can be 0.2mm or thinner.
Behind the roll forming of finishing multilayer magnetic sheet 50, rare with interior third at the surface coverage 2 μ m of multilayer magnetic sheet, polyimides, resin material such as phenol be in case oxidation, and it is carried out performance test (S8 and S9).
Figure 10 is the profile of magnetic sheet that is used for the improvement of radio-frequency (RF) identification (RFID) antenna among the embodiment 6.
As shown in figure 10, the magnetic sheet 50a that is used for embodiment 6 radio-frequency (RF) identification (RFID) antenna is for to insert three layers of initial mold pressing magnetic sheet layer 45a respectively with two-layer amorphous alloy band 46a and 46b, between 45b and the 45c and carry out the five-layer structure that obtains after stacked.Along with the increase of stacked amorphous alloy band 46a and 46b number in the foregoing description 6, the thickness of magnetic sheet has increase slightly.Therefore, the induction coefficient of magnetic sheet further increases, thereby makes its permeability higher.Among the present invention,, also can make 3mm or thinner magnetic sheet by the mode that increases roll forming pressure even what make is the magnetic sheet of multilayer.
As mentioned above in the multilayer magnetic sheet among the embodiment of the invention 5 and the embodiment 6 because by the above-mentioned mode of rolling or pressing with amorphous alloy band 46,46a and 46b are layered in magnetic sheet layer 45a, can produce fine crackle between 45b and the 45c, so can reduce the wastage.Therefore, the present invention can improve in the common amorphous alloy band not enough frequency characteristic, has simplified simultaneously to using existing amorphous alloy band to crack and the complicated technology of bonding amorphous alloy band, thereby can realize automation.
Because can effectively obtain the induction coefficient that RFID signal post needs, with the battery case of its same thickness in the space of battery increased, or the thickness of battery case can attenuation.
RFID magnetic sheet of the present invention can be installed in the RFID equipment that uses radio-frequency (RF) identification (RFID) system, and it can be used for read/write device and transceiver.Yet it is not limited in the said equipment.Especially, because RFID antenna of the present invention comprises the thin absorbing sheet that magnetic sheet is made, it is specially adapted to be installed on the mobile device with radio frequency recognition function.
For example, RFID magnetic sheet of the present invention can be used for being installed in the RFID device on the battery of mobile telephone box, as shown in figure 11.
Radio-frequency (RF) identification (RFID) antenna that Figure 11 is to use the magnetic sheet that is used for radio-frequency (RF) identification (RFID) antenna among the embodiment 5 to make is installed to the profile on the battery of mobile telephone box.
Among Figure 11, the aerial coil that on behalf of electric conducting material, Reference numeral 9 make, 10 represent insulating barrier, and 11a-11c represents adhesive layer, and 20 represent battery, and 21 and 22 represent battery case.Among Figure 11, the multilayer magnetic sheet 50 of the present invention that comprises the three-decker that is formed by magnetic sheet layer 45a and 45b and amorphous alloy band 46 is inserted between the insulating barrier 10 and battery 20 that forms aerial coil 9 on it by adhesive layer 11b and 11c respectively.
As mentioned above, RFID magnetic sheet of the present invention can be made into film like, and can be applied to various devices such as PDA, notebook computer, transportation card, credit card and gate inhibition's card in the mode that is similar to mobile phone.
Below will describe the present invention by various embodiment.But the present invention is not limited in the following examples.
＜embodiment 〉
Embodiment 1 and embodiment 2
In order to obtain the structure identical, by the copper aerial coil being corroded, on the thick polyimide insulative layer of 0.20mm, form the copper aerial coil to 10z specification (being that coil thickness is 0.04mm) with embodiment 1 among Fig. 2 A.
On the other hand, make amorphous alloy Fe-Si-B to form magnetic sheet as absorbing sheet.Original material Fe-B can be used as foundry alloy.Electrolytic iron Fe and Si are mixed to be adjusted to proportion by subtraction with original material Fe-B, afterwards at melt in furnace together, thereby make Fe
79(Si, B)
21Ingot iron.After in Efco-Northrup furnace, making ingot iron, with the Efco-Northrup furnace energized on ingot iron, applying high-frequency energy, thereby ingot iron is thoroughly melted.Afterwards, the fusing under the high temperature metal be sprayed on by nozzle on the chill roll of high speed rotating, making average thickness thus is the amorphous alloy band of 0.02mm.The amorphous alloy band that makes becomes powder in grinding in ball grinder.The powder that makes carries out 7 hours heat treatment under 320 ℃.
As mentioned above, the alloyed powder that makes mixes with polyurethane rubber with 7: 1 ratio.The mixture of alloyed powder and polyurethane is covered to substrate and carries out drying afterwards.Then, substrate is peeled off from it, thereby forms the magnetic sheet of 0.18mm thick (embodiment 1) or 0.25mm thick (embodiment 2).
Magnetic sheet is attached on the another side opposite of insulating barrier by the thick two-sided tape of 0.025mm (9461P, Minnesota Mining and Manufacturing Company) with aerial coil with aerial coil place face.Can make the RFID antenna of structure shown in Fig. 2 B thus.
Embodiment 3 and embodiment 4
The Fe of the Vitroperm (registered trade mark) of FINEMET of HIT (registered trade mark) or German Vacuumschmelze company
73.5Cu
1Nb
3Si
13.5B
9Composition can be used as the alloy of the magnetic sheet of embodiment 3 and embodiment 4.Except that magnetic sheet is made into 0.20mm thick (embodiment 3) or 0.25mm thick (embodiment 4), identical among the manufacture method of RFID and the embodiment 1.
Fe-B can be used as the original material that forms the alloy that magnetic sheet uses.For being adjusted to proportion by subtraction, adding electrolytic iron (Fe) and Zr and have Fe with preparation
90Zr
7B
3The amorphous alloy of forming.Except that magnetic sheet be made into 0.25mm thick, identical among the manufacture method of RFID antenna and the embodiment 1.
Embodiment 6
Co-B is used as the original material that generates the alloy that magnetic sheet uses.For being adjusted to proportion by subtraction, add Co, Si, Fe, Ni and Cr contain Co with making
76(Si, B)
15Fe
4(Cr, Ni)
5The amorphous alloy of composition.Except that magnetic sheet be made into 0.40mm thick, identical among the manufacture method of RFID antenna and the embodiment 1.
Comparative example 1
Except make the thick magnetic sheet of 0.40mm (wherein ferrite comprise Mn and Zn ratio be 2: 1 Mn-Zn family ferrite) with the fine ferrite powder of diameter 5 μ m, be attached with identical among manufacture method and the embodiment 1 of RFID antenna of magnetic sheet.
Comparative example 2
Grind the Fe that this mixture is made in the high-temperature vacuum heat-treatment furnace except mixing at 3: 1 to be incorporated in Fe and Si atomic ratio
75Si
25Powder forms outside the thick magnetic sheet of 0.25mm, the manufacture method of RFID antenna with
Identical among the embodiment 1.
[experimental result]
Induction coefficient is measured
Measure the induction coefficient of RFID antenna under the frequency of 13.56MHz zone that embodiment 1 to embodiment 4 makes, measurement result is as shown in table 1.
Table 1
| The magnetic sheet composition | Magnetic sheet thickness (mm) | Induction coefficient (μ H) | |
| Embodiment 1 | Fe 79(Si，B) 21 | 0.18 | 6.84 |
| | Fe 79(Si，B) 21 | 0.25 | 7.45 |
| Embodiment 3 | Fe 73.5Cu 1Nb 3Si 13.5B 9 | 0.20 | 6.92 |
| | Fe 73.5Cu 1Nb 3Si 13.5B 9 | 0.25 | 7.11 |
| | Fe 90Zr 7B 3 | 0.25 | 7.45 |
| Embodiment 6 | Co 76(Si，B) 15Fe 4(Cr，Ni) 5 | 0.40 | 8.71 |
| Comparative example 1 | Mn-Zn family ferrite | 0.40 | 6.35 |
| Comparative example 2 | Fe 75Si 25 | 0.25 | 6.96 |
When the result to comparative example 1 and embodiment 6 compares, can find that embodiment 6 its induction coefficient under the identical situation of thickness has improved 37%.In embodiment 3, compare with comparative example 1, although its thickness reduces to half, its induction coefficient has improved about 8%.In addition, with the experimental result of comparative example 2 respectively with embodiment 2, the result of embodiment 4 and embodiment 5 compares, and can find that the induction coefficient that these embodiment and comparative example 2 are compared its antenna has improved 2-7%.
[experiment of RFID operating distance]
To comparative example 1 and 2 and embodiment 3 carried out RFID operating distance experiment with measuring.As the method for measuring, the Moneta that uses Korea S SK TELECOM company is as reader, and reader bit is put among Fig. 1 the RFID reader.Comparative example 1 and 2 and the antenna of embodiment 3 be installed in the battery case shown in Figure 6, then use respectively to comprise the mobile phone of RFID chip with the measuring operation distance.Measurement result is shown in following table 2.
Table 2
| Magnetic sheet thickness (mm) | Induction coefficient (μ H) | RFID operating distance (mm) | |
| | 0.25 | 7.45 | 35 |
| Comparative example 1 | 0.40 | 6.35 | 24 |
| Comparative example 2 | 0.25 | 6.96 | 27 |
As shown in table 2, compare comparative example 1 and 2 as can be seen, the operating distance of RFID has improved 30-45% among the embodiment 2.In the time of in the RFID communication that the present invention is applied to mobile phone, mean to solve to a certain extent because of the too short problem that brings inconvenience to the user of existing communication distance.
Except magnetic sheet be made into 0.23mm thick, identical among the manufacture method of RFID antenna and the embodiment 1.The induction coefficient of antenna is measured on the frequency in 13.56MHz zone, and measurement result is as shown in table 3.
In embodiment 8 to embodiment 10, used the amorphous alloy among the embodiment 1.Except alloy band such as Fig. 3 B that magnetic sheet and alloyed powder are made, outside 3C and 3E are stacked together like that, identical among the embodiment 8 (Fig. 3 B), the manufacturing process of embodiment 9 (Fig. 3 C) and the RFID antenna of embodiment 10 (Fig. 3 E) and embodiment 1.The induction coefficient of these antenna is measured on the frequency in 13.56MHz zone, and measurement result is as shown in table 3.
Table 3
| The magnetic sheet composition | The alloy band is laid direction | Alloy bandwidth (mm) | Alloy tape thickness (mm) | Powder belt thickness (mm) | Induction coefficient (μ H) | |
| Comparative example 1 | Mn-Zn family ferrite | - | - | - | 0.40 | 6.35 |
| Comparative example 2 | Fe 75Si 25 | - | - | - | 0.25 | 6.96 |
| | Fe 79(Si，B) 21 | - | - | - | 0.23 | 7.18 |
| | Fe 79(Si，B) 21 | The antenna length direction | 1.5 | 0.02 | 0.23 | 8.03 |
| | Fe 79(Si，B) 21 | The antenna Width | 1.5 | 0.02 | 0.23 | 8.47 |
| | Fe 79(Si，B) 21 | Alternately place | 1.5 | 0.04 | 0.23 | 7.67 |
Referring to table 3, when 0.02mm or the thick alloy band of 0.04mm are connected on the thick alloy powder magnetic sheet of 0.23mm (embodiment 8 to embodiment 10), the induction coefficient of comparing as can be seen when only using the alloy powder magnetic sheet (embodiment 7) has improved 7-18%.Thick with having used 0.4mm as can be seen Mn-Zn ferrite is compared induction coefficient and has been improved 21-33%.The thick Fe with having used 0.25mm as can be seen
75Si
25Magnetic sheet is compared induction coefficient and has also been improved 10-22%.
In embodiment 11 to embodiment 14, the conduct of having used phenol/polyimides to make forms the substrate that is covered with the partially hardened prepreg resin of the insulating barrier of aerial coil.Except the thickness of insulating barrier is respectively 0.080mm (embodiment 11), 0.050mm (embodiment 12) is outside 0.025mm (embodiment 13) and the 0.013mm (embodiment 14), identical among the manufacture method of RFID antenna and the embodiment 1.For the antenna of embodiment 11 to embodiment 14, on the frequency of 13.56MHz zone, its airborne induction coefficient and direct current (DC) resistance to be measured, measurement result is as shown in table 4.
Comparative example 3 and 4
Except the thickness of the insulating barrier that forms aerial coil is respectively 0.17mm and the 0.20mm, identical among the manufacture method of RFID antenna and the embodiment 1.For the antenna of comparative example 3 and 4, frequency is measured its hollow induction coefficient and direct current (DC) resistance in the 13.56MHz zone, and measurement result is as shown in table 4.
Table 4
| The thickness of coil and insulating barrier (mm) | Thickness of insulating layer (mm) | Form the copper sheet thickness (mm) of coil | DC resistance (Ω) | Hollow induction coefficient (μ H) | |
| Comparative example 3 | 0.210 | 0.170 | 0.04 | 0.728 | 4.93 |
| Comparative example 4 | 0.240 | 0.200 | 0.04 | 0.732 | 4.92 |
| | 0.120 | 0.080 | 0.04 | 0.731 | 4.94 |
| | 0.090 | 0.050 | 0.04 | 0.730 | 4.93 |
| | 0.065 | 0.025 | 0.04 | 0.727 | 4.91 |
| | 0.053 | 0.013 | 0.04 | 0.732 | 4.92 |
Above-mentioned comparative example and embodiment can improve 20% or more with the performance of battery under its battery case and the identical or thinner situation of existing battery case thickness.If it is constant to keep the airborne induction coefficient that is used for RFID, then compare the thin 22-57% of variable thickness of its RFID antenna with existing antenna.Antenna better effects if among the antenna ratio embodiment 1 to embodiment 10 among the embodiment 11 to embodiment 14.
Except the thickness of magnetic sheet is made into the 0.35mm, identical in the manufacture method of ferrite sheet (comparative example 5) and magnetic sheet and the comparative example 1.Except ferrite sheet (comparative example 5) and magnetic sheet be made into 0.35mm thick, identical among the manufacture method of amorphous alloy sheets of powder (embodiment 15) and the embodiment 1.Afterwards, the high frequency absorption rate of amorphous alloy powder sheet is measured.Be to measure the high frequency absorption rate, provide the electromagnetic wave of corresponding frequencies, and electromagnetic energy that is transferred to the magnetic sheet reverse side and the electromagnetic energy that is transferred to magnetic sheet are compared magnetic sheet.Measurement result is as shown in table 5.
Table 5
| High frequency (GHz) | |||||
| 2 | 3 | 5 | 6 | ||
| High frequency absorption rate (dB) | Embodiment 15 | -0.9484 | -1.2445 | -1.6892 | -1.9617 |
| Comparative example 5 | -0.7756 | -0.9045 | -1.0008 | -1.1084 | |
| | 22.2 | 37.5 | 68.7 | 76.9 | |
As shown in table 5, as can be seen the magnetic sheet among the embodiment 15 relatively example 5 on thousands of megahertzes (GHz) electromagnetic wave bands, interception result is preferably arranged.
Embodiment 16 and embodiment 17
Fe
79(Si, B)
21It is thick that the amorphous alloy band of composition is made 0.02mm with the method identical with embodiment 1, and make powder by hammering.The powder of making carries out 7 hours heat treatment under 320 ℃.As mentioned above, alloy powder that makes and polyurethane were with 7: 1 mixed.Afterwards, the mixture of alloy powder and polyurethane resin covers on the substrate and carries out drying.Afterwards, substrate is peeled off from it to obtain mixing tab.At last, mixing tab being carried out hot rolling at 70 ℃ handles to make the roll forming magnetic sheet of 0.2mm thick (embodiment 16) or 0.1mm thick (embodiment 17).
As the alloy of the magnetic sheet of embodiment 18 and embodiment 19, with the Fe that has of the Vitroperm (registered trade mark) of embodiment 3 the same FINEMET that use HIT (registered trade mark) or German Vacuumschmelze company
73.5Cu
1Nb
3Si
13.5B
9The amorphous alloy of forming.Identical among the manufacture method of mixed-powder and the embodiment 16, the powder that makes carries out three hours heat treatment under 540 ℃.Identical in the manufacture method of the magnetic sheet of a roll forming and embodiment 16, make the magnetic sheet of 0.2mm thick (embodiment 18) or 0.1mm thick (embodiment 19) at last.
After making the magnetic sheet of a roll forming, has Fe with the method identical with embodiment 16
73.5Cu
1Nb
3Si
13.5B
9The amorphous alloy band of composition is cut into the size identical with mixing tab, and by identical adhesive resin or need not between magnetic sheet that any adhesive is combined in two roll formings, as shown in Figure 9.The multilayer tablet that the magnetic sheet of a roll forming and amorphous alloy band are formed by connecting carries out the monomer magnetic sheet (embodiment 20) of hot rolling to make the thick reroll moulding of 0.2mm at 70 ℃.
When making was inserted into an amorphous alloy band between the roll forming magnetic sheet, Co-B can be used as original material, with identical among the embodiment 6.Except being harmonic component than adding Co, Si, Fe, Ni and Cr are to make Co
76(Si, B)
15Fe
4(Ni, Cr)
5Outside the amorphous alloy of composition, identical method and structure is made magnetic sheet among the employing embodiment 20, and thickness is 0.2mm.
Identical among the production method of a roll forming magnetic sheet and the embodiment 17, it is thick that reroll moulding multilayer magnetic sheet is made into 0.2mm, identical with method and structure among the embodiment 21.
Embodiment 23
Fe
90Zr
7B
3Identical among the manufacture method of the amorphous alloy of composition and the embodiment 15.Identical among the manufacture method of a roll forming magnetic sheet and the embodiment 16, identical among the manufacture method that is inserted into the amorphous alloy band between multilayer tablet and structure and the embodiment 21.Like this, to be made into 0.2mm thick for reroll moulding magnetic sheet.
Embodiment 24
Identical among the manufacture method of a roll forming magnetic sheet and the embodiment 16, identical among the manufacture method that is inserted into the amorphous alloy band between multilayer tablet and the embodiment 18.Two kinds of amorphous alloy bands that make are inserted between the magnetic sheet so that there is the amorphous alloy band between magnetic sheet.Identical among the manufacture method of multiple stratification and the embodiment 20, it is thick that the multilayer magnetic sheet is made into 0.3mm, as shown in figure 10.
Comparative example 6
The MPP powder is used as the raw material of magnetic sheet, wherein the MPP powder by with Ni
81Fe
17Mo
2Mix also fusing, again the product of atomizing fusing and making.Spherical MPP powder is paved by ball mill, thereby obtains diameter 5 μ m or littler powder.The magnetic sheet that makes is that 0.4mm is thick.
[induction coefficient experiments of measuring]
The magnetic sheet that the method for utilization and embodiment 16 to embodiment 24, embodiment 3 and comparative example 6 makes is made the RFID antenna of structure shown in Figure 11.On the frequency of 13.56MHz zone its induction coefficient is measured, measurement result is as shown in table 6.
Table 6
| The composition of multilayer tablet | Magnetic sheet thickness (mm) | Induction coefficient (μ H) | ||
| Magnetic sheet | The amorphous alloy band | |||
| Embodiment 16 | Fe 79(Si，B) 21 | Do not have | 0.2 | 7.93 |
| Embodiment 17 | Fe 79(Si，B) 21 | Do not have | 0.1 | 7.22 |
| | Fe 73.5Si 13.5B 9Cu 1Nb 3 | Do not have | 0.2 | 8.16 |
| | Fe 73.5Si 13.5B 9Cu 1Nb 3 | Do not have | 0.1 | 7.92 |
| | Fe 79(Si，B) 21 | Fe 73.5Si 13.5B 9Cu 1Nb 3 | 0.2 | 15.16 |
| | Fe 79(Si，B) 21 | Co 76(Si，B) 15Fe 4(Ni，Cr) 5 | 0.2 | 15.24 |
| | Fe 73.5Si 13.5B 9Cu 1Nb 3 | Co 76(Si，B) 15Fe 4(Ni，Cr) 5 | 0.2 | 17.32 |
| Embodiment 23 | Fe 90Zr 7B 3 | Co 76(Si，B) 15Fe 4(Ni，Cr) 5 | 0.2 | 16.11 |
| Embodiment 24 | Fe 79(Si，B) 21 | Fe 73.5Si 13.5B 9Cu 1Nb 3 | 0.3 | 21.33 |
| Comparative example 6 | The MPP powder | Do not have | 0.4 | 13.62 |
| Embodiment 3 | Fe 73.5Si 13.5B 9Cu 1Nb 3 | Do not have | 0.2 | 6.92 |
| | Fe 79(Si，B) 21 | Fe 73.5Si 13.5B 9Cu 1Nb 3 | 0.23 | 8.47 |
When the result to embodiment 3 and embodiment 18 compared, the induction coefficient of the compression forming magnetic sheet of embodiment 18 had improved 18% than embodiment 3 as can be seen, although it has adopted the amorphous alloy powder of identical component and made identical thickness with embodiment 3.Compare embodiment 3, the induction coefficient of embodiment 19 has improved 14%, although the thickness of its magnetic sheet only is among the embodiment 3 half.Not being both of induction coefficient because density is different among embodiment 3 and the embodiment 16 to embodiment 19.
Figure 12 A is embodiment 3, is the profile of the magnetic sheet before the roll forming that Figure 12 B is embodiment 16, is the profile of the magnetic sheet behind the roll forming.The relative density of magnetic sheet and amorphous alloy powder is 52%T.D. (solid density) among the embodiment 3, and the relative density among the embodiment 17 is 68%T.D. or bigger.
Adding between magnetic sheet has among the embodiment 20 to embodiment 23 of amorphous alloy band, compares with embodiment 19, and its induction coefficient has improved 79%-100%.This is that the eddy current loss at amorphous alloy band place is less because embodiment 20 to embodiment 23 compares with embodiment 19, thereby even its soft magnetic characteristic does not incur loss yet under the frequency of 13.56MHz zone.
The induction coefficient that has used the embodiment 24 of double-deck amorphous alloy band (0.3mm is thick) is 21.33 μ H.Although compare with embodiment 16 (0.4mm is thick), its thickness has reduced 33%, and its induction coefficient has improved 145% than the 8.71 μ H of embodiment 16.
As mentioned above, invention has been described by specific embodiment.Yet the present invention is not limited in the foregoing description, and under the situation that does not break away from spirit of the present invention, those of ordinary skills can carry out various changes and modifications.
Claims (29)
1. a magnetic sheet that is used for the RFID antenna is characterized in that comprising being selected from Fe-Si-B, Fe-Si-B-Cu-Nb, at least a amorphous alloy among Fe-Zr-B and the Co-Fe-Si-B.
2. the described magnetic sheet that is used for the RFID antenna of claim 1, wherein said amorphous alloy was 300 ℃ to 600 ℃ heat-treated ten hours or be less than ten hours time.
3. the described magnetic sheet that is used for the RFID antenna of claim 1, wherein the magnetic sheet layer comprises:
The magnetic sheet layer that forms by the mixture of amorphous alloy powder and resin; And
Be layered in the amorphous alloy band that comprises at least a described amorphous alloy on the described magnetic sheet layer.
4. the described magnetic sheet that is used for the RFID antenna of claim 3, wherein said amorphous alloy band comprises a plurality of longitudinal joint type alloy bands.
5. the described magnetic sheet that is used for the RFID antenna of claim 1, wherein said magnetic sheet thickness is below the 0.35mm.
6. magnetic sheet that is used for the RFID antenna comprises:
The amorphous alloy powder comprises and is selected from Fe-Si-B, Fe-Si-B-Cu-Nb, at least a amorphous alloy among Fe-Zr-B and the Co-Fe-Si-B; With
Adhesive resin, with described amorphous alloy powder to form sheet.
The described magnetic sheet that is used for the RFID antenna of 7 claims 6, wherein said amorphous alloy powder and adhesive resin mix with 5: 1 to 9: 1 weight ratio.
8. the described magnetic sheet that is used for the RFID antenna of claim 7, the wherein said adhesive resin that is used for is a rubber, polyimides, polyamide, polyurethane, a kind of in silicon and the phenolic resins.
9. RFID antenna is characterized in that comprising:
Magnetic sheet comprises and is selected from Fe-Si-B, Fe-Si-B-Cu-Nb, at least a amorphous alloy among Fe-Zr-B and the Co-Fe-Si-B;
The aerial coil that on insulating barrier, uses the conductive metal material composition and form; And
Be used to connect the articulamentum of described magnetic sheet and described insulating barrier.
10. the described RFID antenna of claim 9, wherein subsclerotic prepreg resin overlay on the one side at least of described insulating barrier.
11. the described RFID antenna of claim 10 further comprises the amorphous alloy belt of being made by at least a described amorphous alloy, it is layered on the surface that is covered with described subsclerotic prepreg resin of described insulating barrier.
12. the described RFID antenna of claim 9 further comprises lower surface that is layered in described magnetic sheet and the amorphous alloy belt of being made by at least a described amorphous alloy.
13. the described RFID antenna of claim 12, wherein said amorphous alloy band comprise a plurality of longitudinal joint type alloy bands.
14. the described RFID antenna of claim 10, wherein said antenna is installed in the battery of mobile telephone.
15. a magnetic sheet that is used for the RFID antenna is characterized in that described magnetic sheet is a sandwich construction, comprising:
The first and second magnetic sheet layers are made by alloy powder, and described alloy powder contains and is selected from Fe-Si-B, Fe-Si-B-Cu-Nb, at least a amorphous alloy among Fe-Zr-B and the Co-Fe-Si-B; And
The first amorphous alloy band comprises at least a described amorphous alloy, and is layered between the described first and second magnetic sheet layers.
16. the described magnetic sheet that is used for the RFID antenna of claim 15 further comprises:
The stacked second amorphous alloy band of making by at least a described amorphous alloy on any one surface of the described first and second magnetic sheet layers; And
Comprise the 3rd magnetic sheet layer that the alloy powder of at least a described amorphous alloy is made in the stacked usefulness of the described second amorphous alloy belt surface.
17. claim 15 or the 16 described magnetic sheets that are used for the RFID antenna, the thickness of the magnetic sheet of wherein said sandwich construction is equal to or less than 0.2mm.
18. the described magnetic sheet that is used for the RFID antenna of claim 15, wherein said amorphous alloy obtains the particle size of nanometer scale by heat treatment.
19. the described magnetic sheet that is used for the RFID antenna of claim 15 wherein has micro-crack at the first stacked amorphous alloy band of the described first and second magnetic sheet interlayers by compressing and forming process.
20. a magnetic sheet that is used for RFID comprises:
A plurality of magnetic sheet layers are selected from Fe-Si-B by containing, Fe-Si-B-Cu-Nb, and the alloy powder of at least a amorphous alloy among Fe-Zr-B and the Co-Fe-Si-B is made; And
A plurality of amorphous alloy bands are made by at least a described amorphous alloy, are layered between described a plurality of magnetic sheet layer.
21. a RFID antenna comprises:
The magnetic sheet of sandwich construction, comprise by containing and be selected from Fe-Si-B, Fe-Si-B-Cu-Nb, a plurality of magnetic sheet layers that the alloy powder of at least a amorphous alloy among Fe-Zr-B and the Co-Fe-Si-B is made, and be layered in a plurality of amorphous alloy bands between described a plurality of magnetic sheet layer by what at least a described amorphous alloy was made;
The insulating barrier that forms on described magnetic sheet surface; And
The aerial coil pattern that forms at this surface of insulating layer composition by electric conducting material.
22. the described RFID antenna of claim 21, wherein said antenna is installed in the battery of mobile phone.
23. be used for the manufacture method of the magnetic sheet of RFID antenna, comprise the steps:
Utilization contained be selected from Fe-Si-B, a plurality of magnetic sheet layers that Fe-Si-B-Cu-Nb, the amorphous alloy powder of at least a amorphous alloy among Fe-Zr-B and the Co-Fe-Si-B make mix with adhesive resin, obtain mixture; And
Be coated in substrate on the form of film described mixture and make its drying, obtain magnetic sheet.
24. the described manufacture method that is used for the magnetic sheet of RFID antenna of claim 23 further comprises the step with described magnetic sheet compression forming.
25. a manufacture method that is used for the magnetic sheet of RFID comprises the steps:
With containing from Fe-Si-B, Fe-Si-B-Cu-Nb, the alloy powder of at least a amorphous alloy of selecting among Fe-Zr-B and the Co-Fe-Si-B prepare the first and second magnetic sheet layers;
With a kind of formation first amorphous alloy band in the described amorphous alloy; With
The first amorphous alloy belt is stacked between the described first and second magnetic sheet layers, then stacked multilayer magnetic sheet layer is carried out compression forming, increasing the relative density of described stacked magnetic sheet layer, and on the described first amorphous alloy band, form microcrack.
26. the described manufacture method that is used for the magnetic sheet of RFID of claim 25 further comprises the steps:
With a kind of preparation second amorphous alloy band in the described amorphous alloy, prepare the 3rd magnetic sheet layer with the alloy powder that contains at least a described amorphous alloy; And
Before the described magnetic sheet layer after stacked was carried out compression forming, the stacked described second amorphous alloy band on the surface of any one in the described first and second magnetic sheet layers was at stacked described the 3rd magnetic sheet layer of the described second amorphous alloy belt surface.
27. the described manufacture method that is used for the magnetic sheet of RFID of claim 25 wherein adopts heat to roll to the step that stacked magnetic sheet carries out compression forming, hot pressing, cold breakdown and cold pressing in any carry out.
28. the described manufacture method that is used for the magnetic sheet of RFID of claim 25, the thickness of the multilayer magnetic sheet after the wherein said compression forming is 0.2mm or littler.
29. the described manufacture method that is used for the magnetic sheet of RFID of claim 25, wherein said amorphous alloy were carried out ten hours in 300 ℃ to 600 ℃ temperature ranges or are less than ten hours heat treatment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020050034460 | 2005-04-26 | ||
| KR1020050034460A KR100523313B1 (en) | 2005-04-26 | 2005-04-26 | Absorber for radio-frequency identificating antenna and radio-frequency identificating antenna using the same |
| KR10-2005-0034460 | 2005-04-26 | ||
| KR10-2006-0024493 | 2006-03-16 | ||
| KR1020060024493 | 2006-03-16 | ||
| KR1020060024493A KR100623518B1 (en) | 2006-03-16 | 2006-03-16 | Magnetic sheet for rf identification antenna, method for producing the same and rf identification antenna using the same |
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| Publication Number | Publication Date |
|---|---|
| CN1855623A true CN1855623A (en) | 2006-11-01 |
| CN1855623B CN1855623B (en) | 2011-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200610075745XA Active CN1855623B (en) | 2005-04-26 | 2006-04-26 | Absorber for radio-frequency identificating antenna, preparation method thereof and radio-frequency identificating antenna using the same |
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| CN (1) | CN1855623B (en) |
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| CN108573808A (en) * | 2017-03-07 | 2018-09-25 | 三星电机株式会社 | The method for manufacturing the method for magnetisable material and manufacturing radio antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100523313B1 (en) | 2005-10-24 |
| CN1855623B (en) | 2011-10-05 |
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