WO2006112468A1 - 電磁波対策部品とそれを用いた電子機器 - Google Patents
電磁波対策部品とそれを用いた電子機器 Download PDFInfo
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- WO2006112468A1 WO2006112468A1 PCT/JP2006/308183 JP2006308183W WO2006112468A1 WO 2006112468 A1 WO2006112468 A1 WO 2006112468A1 JP 2006308183 W JP2006308183 W JP 2006308183W WO 2006112468 A1 WO2006112468 A1 WO 2006112468A1
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- electromagnetic wave
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- magnetic film
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F10/00—Thin magnetic films, e.g. of one-domain structure
- H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
- H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
- H01F10/12—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being metals or alloys
- H01F10/13—Amorphous metallic alloys, e.g. glassy metals
- H01F10/131—Amorphous metallic alloys, e.g. glassy metals containing iron or nickel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F10/00—Thin magnetic films, e.g. of one-domain structure
- H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
- H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
- H01F10/12—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being metals or alloys
- H01F10/14—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being metals or alloys containing iron or nickel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F10/00—Thin magnetic films, e.g. of one-domain structure
- H01F10/26—Thin magnetic films, e.g. of one-domain structure characterised by the substrate or intermediate layers
- H01F10/265—Magnetic multilayers non exchange-coupled
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- 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
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F10/00—Thin magnetic films, e.g. of one-domain structure
- H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
- H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
- H01F10/12—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being metals or alloys
- H01F10/13—Amorphous metallic alloys, e.g. glassy metals
- H01F10/138—Amorphous metallic alloys, e.g. glassy metals containing nanocrystallites, e.g. obtained by annealing
Definitions
- Electromagnetic wave countermeasure parts and electronic devices using them are Electromagnetic wave countermeasure parts and electronic devices using them.
- the present invention relates to an electromagnetic wave countermeasure component and an electronic device such as a portable communication device using the component.
- radio wave local absorption guidelines SAR (Specific Absorption Rate) per unit weight
- a composite magnetic body including soft magnetic powder and an organic binder or an inorganic binder is disposed as an electromagnetic wave absorber on the antenna base of a mobile phone. It is known (see, for example, Patent Documents 1 and 2). here, Utilizing the fact that the imaginary component of the complex magnetic permeability of the composite magnetic material rises rapidly in the vicinity of the transmission frequency of the antenna, electromagnetic waves are consumed as heat loss.
- Patent Document 3 discloses a complex magnetic permeability in the GHz range; an imaginary component of z; an electromagnetic wave absorbing film with an increased z ", ferromagnetic fine particles, and metal oxides and metal nitrides arranged around them.
- a Dara-Yura magnetic film having a grain boundary material, such as the same component, is described in Patent Document 4.
- An electromagnetic wave absorber that satisfies the relationship of “to and ⁇ ′> ⁇ ” is described.
- the electromagnetic wave absorber described in Patent Document 4 has a function of absorbing and attenuating electromagnetic waves ⁇ ”that does not contribute to loss but is made smaller than ⁇ ′ related to the magnitude of the complex permeability ⁇ .
- the noise frequency is usually higher than the signal frequency, it is necessary to increase the resonance frequency sufficiently, and in the case of fine particles, the shape anisotropy is dispersed.
- Patent Document 1 JP 2002-158484 A
- Patent Document 2 JP 2002-158488 A Patent Document 3: Japanese Patent Laid-Open No. 2002-158486
- Patent Document 4 Japanese Unexamined Patent Application Publication No. 2004-128001
- An object of the present invention is to effectively reduce the intensity (electromagnetic field intensity) of an emitted electromagnetic wave in an unnecessary direction while suppressing a decrease in the intensity of a signal transmitted from an electronic device such as a portable communication device. It is to provide an electromagnetic wave countermeasure component and an electronic device using the same.
- An electromagnetic wave countermeasure component is an electromagnetic wave countermeasure component attached to an electronic device having an electromagnetic wave transmission function, wherein a real component of a complex permeability at a transmission band frequency of the electronic device is an imaginary number.
- a high-frequency, high-permeability magnetic film having a component of ⁇ 10, tan S ( ⁇ ′′ / ⁇ ′) of 0.1 or less, and a ferromagnetic resonance frequency of 1.5 times or more of the transmission band frequency It is characterized by comprising.
- An electronic device selectively reduces an electromagnetic field strength with respect to an unnecessary direction of an electromagnetic wave radiated from the electronic device main body having the electromagnetic wave transmission unit and the electromagnetic wave transmission unit.
- FIG. 1 is a front view showing a configuration of a mobile phone according to an embodiment of the present invention.
- FIG. 2 is a rear view of the mobile phone shown in FIG.
- FIG. 3 is a cross-sectional view showing the structure of a high-frequency and high-permeability magnetic film according to one embodiment of the present invention.
- FIG. 4 is a perspective view showing a structure of a high-frequency high-permeability magnetic film according to another embodiment of the present invention.
- FIG. 5 is a graph showing the frequency dependence of ⁇ ′ ⁇ ”of the high-frequency, high-permeability magnetic film according to Example 1 of the present invention.
- FIG. 6 is a diagram showing the frequency dependence of z ′ ′ of the high-frequency and high-permeability magnetic film according to Example 2 of the present invention.
- FIG. 7 is a diagram showing the frequency dependence of ⁇ ′ ⁇ ′′ of the high-frequency high-permeability magnetic film according to Example 3 of the present invention.
- FIG. 8 is a graph showing the frequency dependence of ⁇ ′ ⁇ ′′ of the high-frequency high-permeability magnetic film according to Example 6 of the present invention.
- FIG. 9 is a view showing the frequency dependence of ⁇ ′ ⁇ ′′ of the high-frequency high-permeability magnetic film according to Example 7 of the present invention.
- FIG. 10 is a diagram showing the frequency dependence of ⁇ ′′ of the high-frequency, high magnetic permeability magnetic film according to Example 8 of the present invention.
- FIG. 11 is a view showing the frequency dependence of the high-frequency high magnetic permeability magnetic film according to Example 10 of the present invention.
- FIG. 12 is a diagram showing the frequency dependence of the high-frequency, high magnetic permeability magnetic film according to Example 11 of the present invention.
- FIG. 13 is a diagram showing the frequency dependence of the high-frequency high magnetic permeability magnetic film according to Example 12 of the present invention.
- FIG. 14 is a graph showing the frequency dependence of ⁇ ′ ⁇ ′′ of the magnetic film according to Comparative Example 1.
- FIG. 15 is a diagram showing the frequency dependence of ⁇ ′′ of the magnetic film according to Comparative Example 2. Description of Symbols
- FIG. 1 is a front view showing a schematic configuration of a mobile phone according to an embodiment of the present invention
- FIG. 2 is a rear view thereof.
- the foldable mobile phone 10 shown in these figures has a lower housing 11 and an upper
- the housing 12 has a structure in which the housing 12 is rotatably connected via a hinge portion 13.
- the lower casing 11 houses a circuit board 14 on which a transmission circuit, a reception circuit, a switching circuit, a control circuit, and the like are mounted, and an input keypad 15 is disposed on the surface thereof. Further, the lower housing 11 includes an antenna 16 as an electromagnetic wave transmission unit, and wireless signals (electromagnetic waves) including various data such as voice data, character data, and image data are transmitted and received from the antenna 16. The antenna 16 is connected to the transmission circuit and the reception circuit via antenna wiring provided on the circuit board 14.
- the upper housing 12 has a display unit 17 such as a liquid crystal display device.
- an electromagnetic wave countermeasure component 18 having a high-frequency and high-permeability magnetic film is disposed.
- the electromagnetic wave countermeasure component 18 is arranged so as to selectively reduce the strength of the electromagnetic wave radiated from the antenna 16 and the circuit board 14 in the unnecessary direction, that is, the electromagnetic field strength in the direction of the human head.
- An electromagnetic wave countermeasure component 18 having a high-frequency high-permeability magnetic film is disposed between the antenna wiring by the antenna 16 and the circuit board 14 and the surface facing the human body side of the lower housing 11 (the surface having the keypad 15, a microphone, a speaker, etc. not shown).
- an electromagnetic wave countermeasure component 18 disposed in the lower casing 11 is interposed between the human head and the antenna 16 and the antenna wiring in the vicinity thereof.
- ⁇ is the complex permeability at the transmission band frequency of the mobile phone 10; the imaginary component of z.
- the complex permeability defined in the present invention is the complex relative permeability).
- the transmission frequency band of portable communication devices is diverse as shown in Table 1, the transmission frequency band that is particularly problematic in the electromagnetic wave intensity (SAR) absorbed by the human body is in the range of 824 MHz to 1980 MHz. .
- SAR electromagnetic wave intensity
- Conventional electromagnetic wave countermeasure components do not have sufficient power, and suddenly rise near the transmission frequency. Is consumed as.
- Conventional electromagnetic wave countermeasure components use a large component in the GHz range that is far from being a magnetic material. sand In other words, conventional electromagnetic wave countermeasure parts use a magnetic material as an electromagnetic wave absorber.
- the electromagnetic wave countermeasure component 18 of this embodiment increases the ferromagnetic resonance frequency fr by increasing the anisotropic magnetic field of the magnetic film, thereby reducing a large ⁇ 'in the low frequency region in the high frequency region. But it has been realized.
- the electromagnetic wave radiated from the antenna 16 or antenna wiring toward the human head side is magnetized by the high frequency, high permeability magnetic film. It can be led up or down through the circuit. That is, it is possible to reduce the electromagnetic field strength in the space where the human head is arranged.
- the high-frequency high-permeability magnetic film is a complex magnetic permeability at a transmission band frequency.
- the real component of ' is assumed to be 10 or more. If the high-frequency, high-permeability magnetic film has a value of less than 10, the function as a magnetic circuit that guides electromagnetic waves upward and downward cannot be obtained sufficiently.
- the ⁇ 1 of the high-frequency, high-permeability magnetic film specified here is a force that is based on the transmission band frequency of the mobile phone 10.
- the real component u ′ of the complex permeability ⁇ at 2 GHz is 10 or more. It is preferable.
- the thickness of the high-frequency and high-permeability magnetic film is more preferably 15 or more, and further preferably 30 or more.
- the transmission band frequency of the cellular phone 10 for example, the region up to 2 GHz.
- the anti-electromagnetic wave component 18 having a high-frequency, high-permeability magnetic film exhibiting a small ⁇ ′ the intensity of unnecessary electromagnetic waves radiated toward the human head side can be reduced.
- ⁇ "force S is reduced, so that loss due to heat loss of electromagnetic waves can be reduced.
- the high-frequency, high-permeability magnetic film constituting the electromagnetic wave countermeasure component 18 has a ferromagnetic resonance frequency fr of 1.5 of the transmission band frequency in order to reduce the imaginary component "of the complex permeability at the transmission band frequency.
- Ferromagnetic resonance frequency fr of high-frequency, high-permeability magnetic film is practically preferably 1.5 times or more of 2 GHz as a reference.
- the ferromagnetic resonance frequency fr of the high-frequency, high-permeability magnetic film is at least twice the transmission band frequency.
- the complex permeability at the transmission band frequency of the mobile phone 10; the real component 'of z is 10 or more, tan S ( g Z') is 0.1 or less, and the ferromagnetic resonance frequency fr is
- the anti-electromagnetic wave component 18 having a high-frequency, high-permeability magnetic film 1.5 times the transmission band frequency it is possible to radiate in an unnecessary direction while suppressing a decrease in the signal intensity transmitted from the mobile phone 10. It is possible to effectively reduce the intensity of electromagnetic waves. Specifically, it is possible to effectively reduce the electromagnetic field strength in the space where the human head or the like is placed.
- an electromagnetic wave countermeasure component 18 it becomes possible to provide a portable communication device such as the cellular phone 10 that achieves both improved signal characteristics and SAR countermeasure.
- the high-frequency and high-permeability magnetic film constituting the electromagnetic wave countermeasure component 18 is not limited to the composition and film structure as long as the above-described characteristics are satisfied.
- the film structure of the magnetic film is not particularly limited, such as an amorphous film, a heteromorphic film, a crystal film, a single-layer film, a nanocrystal film, etc.
- Various magnetic films having such a magnetic structure and characteristics can be applied to the high permeability magnetic film.
- the ⁇ ′′ / ⁇ ′ ratio, fr, etc. of the high frequency high permeability magnetic film are the same as those of the magnetic film.
- the film composition, film structure, film thickness, film shape (slip shape, etc.), film formation conditions, heat treatment conditions after film formation, and the like can be adjusted.
- Examples of the high-frequency high-permeability magnetic film include
- T is at least one selected from Fe, Co and Ni
- A is at least one selected from B, C, Si, P, Ge and Zr
- D is from Si, Al, Zr and Hf
- X and y are 50 ⁇ x ⁇ 100 (atomic%), 0 ⁇ y ⁇ 50 (atomic%)
- the element T is an element responsible for magnetism, and the composition ratio is adjusted according to the required magnetic properties.
- Element A is an element added for controlling magnetic anisotropy, thermal stability, corrosion resistance, crystallization temperature, and the like.
- the content of element A is appropriately adjusted within a range of 50 atomic% or less with respect to the total amount of element T and element A. If the content of element A exceeds 50 atomic%, the content of element T will decrease relatively, and sufficient magnetic properties may not be obtained.
- the magnetic film may be composed only of the element T and the element A, but may contain a grain boundary material that is a compound D force in controlling magnetic anisotropy and the like.
- Compound D constituting the grain boundary material is an oxide of at least one element Ml selected from Si, Al, Zr and Hf, or a nitride of at least one element M2 selected from Si and A1. It is an insulator.
- the presence of such grain boundary substances in the magnetic film can increase the anisotropic magnetic field of the magnetic film. It is preferable to adjust the content of the grain boundary material so that the atomic ratio y of compound D is 50% or less. If the atomic ratio y of the compound D exceeds 50%, sufficient characteristics as a magnetic film may not be obtained.
- the high-frequency and high-permeability magnetic film is formed by applying, for example, sputtering or vapor deposition.
- a magnetic film having a grain boundary material that also has compound D force is an alloy target having a T A composition.
- the specific target composition is appropriately adjusted according to the required characteristics.
- the composition and structure can be adjusted by changing the input power to each target, and various magnetic properties can be controlled by these.
- a target made of Ml or M2 is used, and an oxygen atmosphere, a nitrogen atmosphere, a mixed atmosphere of oxygen and an inert gas such as Ar, or nitrogen and Ar.
- the film may be formed by reactive sputtering in a mixed atmosphere with an inert gas.
- both a single layer film and a multilayer film of a magnetic layer satisfying the composition of the formula (1) are applicable.
- a high-frequency, high-permeability magnetic film 20 shown in FIG. 3 includes a laminated film 24 in which a plurality of magnetic layers 23 are laminated on a nonmagnetic insulating base 21 via a nonmagnetic insulating layer 22.
- FIG. 3 shows a high-frequency, high-permeability magnetic film 20 in which laminated films 24 are formed on both main surfaces of the nonmagnetic insulating substrate 21.
- the laminated film 24 may be formed only on one main surface of the nonmagnetic insulating substrate 21.
- the high-frequency magnetic characteristics of the magnetic film are affected by the film thickness, and if the film thickness is too thick, the magnetic characteristics deteriorate due to the skin effect caused by eddy currents.
- the imaginary component ⁇ ′′ of the complex permeability in the high frequency range increases with the increase in the thickness of the magnetic film. Therefore, by laminating the magnetic layer 23 via the nonmagnetic insulating layer 22, each magnetic layer It is preferable to keep the film thickness of the layer 23 small.
- the film thickness of each magnetic layer 23 as a single layer is preferably: m or less, and more preferably 0.5 m or less.
- the thickness of the layer 22 can be adjusted as appropriate as long as the magnetic properties of the high-frequency and high-permeability magnetic film 20 are not impaired.
- the number of magnetic layers 23 is preferably set in consideration of the effect when the high-frequency and high-permeability magnetic film 20 is used as the electromagnetic wave countermeasure component 18. That is, the effect of reducing the electromagnetic field strength in the unnecessary direction by the electromagnetic wave countermeasure component 18 is affected by the total film thickness of the entire magnetic film. If the magnetic film thickness of the high-frequency and high-permeability magnetic film 20 is too thin, the function as a magnetic circuit for guiding electromagnetic waves in a desired direction is deteriorated.
- the high-frequency and high-permeability magnetic film includes a magnetic film that has an anisotropic magnetic field enhanced based on, for example, induced magnetic anisotropy or shape magnetic anisotropy, thereby imparting uniaxial magnetic anisotropy. Used.
- an anisotropic magnetic field mainly based on induced magnetic anisotropy to a high-frequency, high-permeability magnetic film, a dullar having a composition in which the value of y in the above formula (1) is in the range of 10 to 50 atomic% It is preferable to apply a magnetic film.
- Anisotropic magnetic field based on induced magnetic anisotropy can be enhanced with good reproducibility by forming such a magnetic film in a magnetic field or by performing a heat treatment in the magnetic field after the film formation.
- the composition of the magnetic film is not limited to the above composition as long as the induced magnetic anisotropy can be imparted by film formation in a magnetic field or heat treatment in a magnetic field.
- a high-frequency, high-permeability magnetic film 30 shown in FIG. 4 includes a magnetic film 32 formed on a nonmagnetic insulating substrate (supporting substrate) 31.
- the magnetic film 32 has a stripe shape.
- the stripe width W is in the range of 10 to 500 ⁇ m
- the stripe interval S is 5 to: the range of LOO ⁇ m
- the length L is 10 mm or more. Is preferred.
- the length L of the stripe-shaped magnetic film 32 should be in the range of 10 to 70 mm! /. If the length L is less than 10 mm, the effect of forming a stripe shape may not be sufficiently obtained. On the other hand, if the length L exceeds 70 mm, the high-frequency and high-permeability magnetic film will be increased in size, making it difficult to mount it on the mobile phone 10 or the like.
- the anisotropic magnetic field of the high-frequency, high-permeability magnetic film is not limited to either one of induced magnetic anisotropy or shape magnetic anisotropy, but also induced magnetic anisotropy and shape magnetic anisotropy. It goes without saying that both may be used.
- the anisotropic magnetic field can be further increased by patterning a magnetic film having a composition that easily induces induced magnetic anisotropy into a stripe shape.
- the high-frequency, high-permeability magnetic film preferably has a laminated magnetic film 20 as shown in FIG. The single layer thickness of each magnetic layer and the total thickness of the laminated film are as described above.
- the electromagnetic wave countermeasure component 18 is disposed so as to reduce the electromagnetic field strength of the space where the human head is disposed.
- the space for reducing the electromagnetic field strength is not limited to this. It is not limited.
- the electromagnetic wave countermeasure component 18 also functions effectively to reduce the electromagnetic field strength in a space where other electronic components and electronic devices (for example, camera components in the case of a mobile phone) that are vulnerable to noise are arranged.
- the electronic device of the present invention is not limited to this.
- the present invention is applicable to various types of electronic devices having an electromagnetic wave transmission function represented by portable communication devices.
- the amorphous magnetic particles had a structure dispersed in the matrix of SiO.
- the high-frequency and high-permeability magnetic film uses a 0.5 m thick FeCoBSiO film formed on both sides of a 100 ⁇ m thick polyimide substrate using the above-described composite target, and a SiO target.
- the film was formed by alternately stacking 0.05 m thick SiO films. Repeat
- This high-frequency, high-permeability magnetic film is provided with uniaxial magnetic anisotropy based on induced magnetic anisotropy.
- the film structure of the high-frequency, high-permeability magnetic film is [(FeCoBSiO film (0.5 ⁇ ⁇ ) / 8 ⁇
- Example 1 FeCoBSiO film
- Example 1 was subjected to heat treatment in a magnetic field by heating to 270 ° C. in a nitrogen atmosphere in a 400 kAZm DC magnetic field after film formation.
- a high-frequency high-permeability magnetic film having the same structure as in Example 1 was produced.
- Table 2 shows the film composition and film structure.
- the saturation magnetic field Ms was 1.4T
- the anisotropic magnetic field Hk was 4.0 ⁇ 10 4 AZm
- the ferromagnetic resonance frequency fr was 3700 MHz.
- the frequency dependence of 'and was measured for high-frequency and high-permeability magnetic films. The result is shown in Fig. 6.
- the high-frequency high permeability has a smaller value at 2 GHz.
- the / ⁇ 'ratio at 2 GHz is 0.04.
- Such a high-frequency high-permeability magnetic film was subjected to characteristic evaluation described later.
- a high-frequency and high-permeability magnetic film was produced in the same manner as in Example 1 except that the single-layer thickness of the magnetic film (FeCoBSiO film) in Example 1 was 0.3 m.
- the film structure of the high-frequency, high-permeability magnetic film is [(FeCoBSiO film (0.3 ⁇ ⁇ ) / 8 ⁇ film (0. 05 m)) ZZ polyimide substrate (100
- the film structure is as shown in Table 2.
- Sarakuko measured the magnetic properties of high-frequency, high-permeability magnetic films. The measurement results are shown in Table 3.
- the frequency dependence of ⁇ ′ and ⁇ ′′ of the high-frequency, high-permeability magnetic film is shown in FIG.
- a high-frequency and high-permeability magnetic film was produced in the same manner as in Example 1 except that the number of laminated layers per side of the magnetic film of Example 1 (FeCoBSiO film) was set to 3.
- the film structure of the high-frequency, high-permeability magnetic film is: ((FeCoBSiO film (0. 5 ⁇ ⁇ ) / 8 ⁇ film (0. 05 m))
- composition and film structure are shown in Table 2.
- magnetic properties of the high-frequency, high-permeability magnetic film were measured.
- the measurement results are shown in Table 3.
- Such a high-frequency, high-permeability magnetic film was subjected to the characteristic evaluation described later.
- a high-frequency and high-permeability magnetic film was produced in the same manner as in Example 1 except that the magnetic film (FeCoBSiO film) in Example 1 was a single layer film.
- the film structure of the high-frequency high-permeability magnetic film is [FeCoB SiO film (0.5 ⁇ ⁇ ) / 8 ⁇ film (0.05 111) 77 Polyimide substrate (100 111) 77310 film
- Table 2 shows the film composition and film structure. Furthermore, the magnetic properties of the high-frequency and high-permeability magnetic film were measured. The measurement results are shown in Table 3. Such a high-frequency high-permeability magnetic film is used for the characteristic evaluation described later. It was.
- the laminated film formed in the same manner as in Example 1 was subjected to ion milling and patterned in a stripe shape as shown in FIG.
- S X length L 75 m X 25 m X 40 mm.
- a magnetic film was formed by an RF magnetron sputtering apparatus using the placed target.
- the input power was 3.3 WZcm 2
- the target-substrate distance was 75 mm
- the argon pressure was 3.2 Pa (500 SCCM).
- a magnetic field of 1.6 ⁇ 10 4 AZm was applied in the direction perpendicular to the substrate normal during film formation.
- the composition of the obtained magnetic film (FeCoZrSiO film) is (Fe Co Zr) (SiO 2) (atomic 0 /.), And the composition of Fe Co Zr with a diameter of about 200 nm
- the film was formed on both sides of a 100 ⁇ m-thick polyimide substrate, and the film was formed using the above-mentioned composite target and a 0.5-m thick FeCoZrSiO film, and a SiO target.
- a SiO film of 0.05 / z m was alternately formed.
- the number of repeated layers was 4 on both sides.
- composition of the layer film is: ((FeCoZrSiO film (0.5 ⁇ ⁇ ) / 8 ⁇ film (0. 05 m)))
- Such a laminated film was subjected to ion milling and patterned in a stripe shape as shown in FIG.
- the film composition and film structure are shown in Table 2.
- Sarakuko measured the magnetic properties of high-frequency, high-permeability magnetic films. The measurement results are shown in Table 3.
- the frequency dependence of ⁇ ′ and ⁇ ′′ of the high-frequency, high-permeability magnetic film is shown in FIG.
- Example 7 FeCoZrSiO film
- a high-frequency high-permeability magnetic film having the same structure as in Example 7 was produced.
- Table 2 shows the film composition and film structure.
- the magnetic properties of the high-frequency and high-permeability magnetic film were measured. The measurement results are shown in Table 3.
- Figure 10 shows the frequency dependence of / z 'and g of the high-frequency, high-permeability magnetic film. Such a high-frequency and high-permeability magnetic film was subjected to the characteristic evaluation described later.
- a high-frequency and high-permeability magnetic film was produced in the same manner as in Example 7 except that the number of layers per side of the magnetic film of Example 7 (FeCoZrSiO film) was set to two.
- the film structure of the high-frequency, high-permeability magnetic film is [(FeCoZrSiO film (0.5 ⁇ ⁇ ) / 8 ⁇ film (0. 05 m))
- composition and film structure are shown in Table 2.
- magnetic properties of the high-frequency, high-permeability magnetic film were measured.
- the measurement results are shown in Table 3.
- Such a high-frequency, high-permeability magnetic film was subjected to the characteristic evaluation described later.
- the film was formed by RF magnetron sputtering equipment. Deposition was performed on both sides of a polyimide substrate with a thickness of 100 / zm, with a Fe Co film with a thickness of 0.0 and a thickness of 0.05 m. The SiO films were alternately formed.
- the input power during magnetic film formation is 3.3 W / cm 2 ,
- the target-substrate distance was 75 mm, and the argon pressure was 1.6 Pa (500 SCCM). It should be noted that the magnetic field is not marked when the magnetic film is formed.
- the structure of the laminated film (sputtered film) is [(Fe Co film (0.5 m) ZSiO film (0.0
- the laminated film is ion milled and striking as shown in Fig. 4.
- Example 10 is the same as Example 10 except that the magnetic film (Fe Co film) of Example 10 has a single layer thickness of 1 m.
- the film structure of the high-frequency, high-permeability magnetic film is [(Fe Co)
- Table 2 shows. Sarakuko measured the magnetic properties of high-frequency, high-permeability magnetic films. The measurement results are shown in Table 3. In addition, the frequency dependence of / z 'and "of a high-frequency high-permeability magnetic film is shown in Fig. 12. Such a high-frequency high-permeability magnetic film was used for the characteristic evaluation described later.
- a magnetic film was prepared.
- the film composition and film structure are as shown in Table 2.
- Sarakuko measured the magnetic properties of high-frequency, high-permeability magnetic films. The measurement results are shown in Table 3.
- Figure 13 shows the frequency dependence of 'and for a high-frequency, high-permeability magnetic film. Such a high-frequency and high-permeability magnetic film was subjected to characteristic evaluation described later.
- a film was formed by an RF magnetron sputtering apparatus.
- the input power was 3.3 WZcm 2
- the target-substrate distance was 75 mm
- the argon pressure was 3.2 Pa (500 SCCM).
- a magnetic field of 1.6 ⁇ 10 4 AZm was applied in the direction perpendicular to the substrate normal during film formation.
- the composition of the obtained magnetic film (CoFeBSiO film) is (Co Fe B
- the film was formed on both sides of a polyimide substrate having a thickness of 100 ⁇ m, and was formed using a CoFeBSiO film having a thickness of 0.5 m formed using the above-described composite target and a SiO target.
- a 0.05 m SiO film was alternately formed.
- the number of repeated layers was 4 on both sides.
- composition of the film is: ((CoFeBSiO film (0. 5 ⁇ ⁇ ) / 8 ⁇ film (0. 05 / zm))
- the saturation magnetic field Ms was 1.5 T
- the anisotropic magnetic field Hk was 2.0X10 4 AZm
- the ferromagnetic resonance frequency fr was 2200 MHz.
- the frequency dependence of the magnetic film was measured. The result is shown in FIG. As is clear from FIG. 14, the z of the magnetic film rose from a relatively low frequency region, and the ratio at 2 GHz was 0.17.
- Example 10 except that the single layer thickness of the magnetic film (Fe Co film) of Example 10 is 1.5 m.
- a laminated magnetic film was produced in the same manner as described above.
- the film structure of the laminated magnetic film is [(F e Co film (1.5 (1.
- the saturation magnetic field Ms was 1.7 T
- the anisotropic magnetic field Hk was 6.9 ⁇ 10 4 AZm
- the ferromagnetic resonance frequency fr was 5400 MHz.
- the frequency dependence of and of the magnetic film was measured. The results are shown in Fig. 15. As is clear from Fig. 15, the magnetic film has a relatively low frequency domain force, and I n 'it at 0.2 GHz is 0.22.
- the film composition and film structure are as shown in Table 2.
- the saturation magnetic field Ms was 1.1 T
- the anisotropic magnetic field Hk was 10.
- OX 10 4 AZm the ferromagnetic resonance frequency fr was 6600 MHz.
- the value of the magnetic film at 2 GHz was as low as 9.2.
- Example 1 Fe50C ° 35 B 15 20 (solid film) 0.5 2 None Difficult example 2 Fe 50 Co 35 B 15 20 (solid film) 0.5 2 Yes Difficult example 3 Fe 50 Co 35 B 15 20 (solid film) 0.3 2 None Difficult 4 4 4 £
- Fe5oCo35 B 15 20 (Peta film) 0.5 3
- Example 5 Fe 50 Co 35 B 15 20 (Solid film) 0.5 1 None
- Example 6 Fe 50 Co 35 B 15 20 75 25 40 0.5 2 None
- Example 7 Fe 68 Co 17 Zr 15 20 15 5 40 0.5 4 No
- Example 8 Fe 68 Co 17 Zr 15 20 15 5 40 0.5 4 Yes
- Example 9 Fe 68 Co 17 Zr 15 20 15 5 40 0.5 2 No
- the anti-electromagnetic wave component 18 provided with each of the high-frequency and high-permeability magnetic films according to Examples 1 to 15 described above was cut into a shape of 20 mm x 5 mm and a shape of 40 mm x 5 mm. As shown in FIGS. 1 and 2, on the antenna wiring in the vicinity of the antenna 16 of the mobile phone 10, the easy axis direction of the high frequency high permeability magnetic film is parallel to the substrate wiring pattern. I pasted it. Using such a mobile phone, we measured the effect of reducing the SAR intensity and improving the antenna efficiency. The same measurement was performed for each laminated magnetic film according to Comparative Example 13 as well.
- the electric field intensity distribution excited inside the uniform simulated tissue model using the SAM phantom was measured using an electric field probe.
- the antenna efficiency improvement effect electromagnettic strength improvement effect
- the electric field strength in the space other than the SAM phantom was measured using an electric field probe.
- the transmission frequency is! /
- the deviation is 2GHz. Table 3 shows the measurement results.
- ⁇ ′ at the transmission band frequency of the high-frequency high-permeability magnetic film is preferably 15 or more, more preferably 30 or more, and the ferromagnetic resonance frequency fr is preferably at least twice the transmission band frequency. It turns out that it is more preferable.
- Example 1 the electric field strength inside the SAM phantom is reduced by 3.2 dB, and the antenna efficiency in the space other than the SAM phantom is improved by 2.2 dB.
- Example 5 in which the total film thickness of the magnetic film is made thinner is slightly inferior to Example 1 in reducing the SAR intensity and improving the antenna efficiency. Therefore, it is preferable to increase the total film thickness of the magnetic film based on the number of laminated magnetic layers.
- Example 10 and Example 11 and Comparative Example 2 As is clear from the above, the thickness of the single layer of the magnetic layer is preferably 1 ⁇ m or less because the thickness increases when the single layer of the magnetic layer is too thick. Further, from the comparison between Example 10, Example 12 and Comparative Example 3, it can be seen that it is preferable to appropriately adjust the stripe width W and the stripe interval S in the stripe shape.
- the present invention is not limited to the above-described embodiment.
- the example in which the electronic device of the present invention is applied to a mobile phone has been described.
- the present invention is not limited to this and can be applied to various portable communication devices.
- the present invention is applicable to various electronic devices having an electromagnetic wave transmission function.
- the embodiments of the present invention can be expanded or modified within the scope of the technical idea of the present invention, and the expanded and modified embodiments are also included in the technical scope of the present invention.
- the electromagnetic wave countermeasure component according to an aspect of the present invention is effectively used for electromagnetic wave countermeasures in various electronic devices having an electromagnetic wave transmission function. According to the electromagnetic wave countermeasure component according to the aspect of the present invention, it is possible to reduce the electromagnetic field strength with respect to the unnecessary direction of the radiated electromagnetic wave while suppressing a decrease in the transmitted signal strength. Therefore, according to an electronic device using such an electromagnetic wave countermeasure component, it is possible to reduce the influence of the electromagnetic wave on, for example, the human body, other electronic components, and the electronic device while maintaining good communication characteristics due to the electromagnetic wave. It becomes.
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- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Thin Magnetic Films (AREA)
- Hard Magnetic Materials (AREA)
- Soft Magnetic Materials (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
Claims
Priority Applications (4)
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KR1020077026826A KR100955992B1 (ko) | 2005-04-20 | 2006-04-19 | 전자파 대책 부품과 그것을 이용한 전자 기기 |
CN200680013440A CN100594766C (zh) | 2005-04-20 | 2006-04-19 | 防止电磁波零部件及使用防止电磁波零部件的电子设备 |
US11/911,764 US7667655B2 (en) | 2005-04-20 | 2006-04-19 | Electromagnetic interference preventing component and electronic device using the same |
JP2007528162A JP4691103B2 (ja) | 2005-04-20 | 2006-04-19 | 電磁波対策部品とそれを用いた電子機器 |
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JP (1) | JP4691103B2 (ja) |
KR (1) | KR100955992B1 (ja) |
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WO (1) | WO2006112468A1 (ja) |
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JP2009059932A (ja) * | 2007-08-31 | 2009-03-19 | Toshiba Corp | 高周波用磁性材料およびこれを用いたアンテナ装置 |
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JPWO2008120756A1 (ja) * | 2007-03-29 | 2010-07-15 | 京セラ株式会社 | 携帯無線機 |
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WO2010137605A1 (ja) * | 2009-05-26 | 2010-12-02 | アルプス電気株式会社 | 通信装置 |
US8665160B2 (en) * | 2011-01-31 | 2014-03-04 | Apple Inc. | Antenna, shielding and grounding |
US8587939B2 (en) | 2011-01-31 | 2013-11-19 | Apple Inc. | Handheld portable device |
CN102882003A (zh) * | 2011-07-11 | 2013-01-16 | 智易科技股份有限公司 | 具有电波干扰遮蔽盖的天线 |
US9444194B2 (en) * | 2012-03-30 | 2016-09-13 | Molex, Llc | Connector with sheet |
FR3007214B1 (fr) * | 2013-06-14 | 2015-07-17 | Commissariat Energie Atomique | Blindage magnetique d'antenne utilisant un composite a base de couches minces magnetiques et antenne comprenant un tel blindage |
EP3387701A4 (en) | 2015-12-08 | 2019-06-19 | 3M Innovative Properties Company | MAGNETIC INSULATION, MANUFACTURING METHOD THEREOF AND DEVICE CONTAINING SAME |
WO2017100029A1 (en) | 2015-12-08 | 2017-06-15 | 3M Innovative Properties Company | Magnetic isolator, method of making the same, and device containing the same |
US10658096B2 (en) | 2016-03-04 | 2020-05-19 | 3M Innovative Properties Company | Magnetic multilayer sheet |
TWI720482B (zh) * | 2019-05-15 | 2021-03-01 | 貿聯國際股份有限公司 | 高速線端連接器製造方法 |
US11710707B2 (en) * | 2020-03-26 | 2023-07-25 | Shibaura Mechatronics Corporation | Electromagnetic wave attenuator, electronic device, film formation apparatus, and film formation method |
US20220165466A1 (en) * | 2020-11-21 | 2022-05-26 | Winchester Technologies, LLC | Millimeter thick magnetic pcb with high relative permeability and devices thereof |
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CN100594766C (zh) | 2010-03-17 |
CN101164395A (zh) | 2008-04-16 |
JP4691103B2 (ja) | 2011-06-01 |
US20090040126A1 (en) | 2009-02-12 |
US7667655B2 (en) | 2010-02-23 |
KR100955992B1 (ko) | 2010-05-04 |
JPWO2006112468A1 (ja) | 2008-12-11 |
KR20080004610A (ko) | 2008-01-09 |
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