WO2006070696A1 - 電磁波吸収板 - Google Patents
電磁波吸収板 Download PDFInfo
- Publication number
- WO2006070696A1 WO2006070696A1 PCT/JP2005/023644 JP2005023644W WO2006070696A1 WO 2006070696 A1 WO2006070696 A1 WO 2006070696A1 JP 2005023644 W JP2005023644 W JP 2005023644W WO 2006070696 A1 WO2006070696 A1 WO 2006070696A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electromagnetic wave
- dielectric
- plate
- thickness
- equation
- Prior art date
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
-
- 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
- H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
-
- 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
-
- 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
-
- 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
- H05K9/0001—Rooms or chambers
- H05K9/0005—Shielded windows
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B2001/925—Protection against harmful electro-magnetic or radio-active radiations, e.g. X-rays
Definitions
- the present invention relates to a transparent electromagnetic wave absorbing plate mainly used for an opening of an outer wall of a building or an indoor partition.
- Wireless communication methods include mobile phones, PDAs (Personal Digital Assistance) (information portable terminals), wireless LAN (Local Area Network), broadcast waves, automotive radar, ETC (Electronic Toll Collection System) Equipment, various electronic devices, etc.
- a wireless LAN in-house information communication network
- indoor LAN construction cord wiring work, etc.
- wireless LAN in the room, reduces the LAN speed due to the influence of reflectors (desks, lockers, chairs, etc.), wiretapping due to radio wave leakage to the outside, and radio interference between buildings
- a transparent electromagnetic wave absorbing plate is required at an indoor partition or an opening of a building or building.
- ETC lane at the toll collection point on the expressway in order to prevent malfunctions due to reflected waves from cars in general lanes, it is transparent as a partition for ETC lanes and general lanes, and for partitions between ETC lanes An electromagnetic wave absorbing plate is needed.
- an electromagnetic wave absorbing plate that absorbs electromagnetic waves
- an ITO (Indium-Tin Oxide) conductive film laminated on a transparent film is used for two layers, one is a radio wave absorber, and the other is a radio wave reflector.
- a transparent radio wave absorber that can be adjusted to a quarter of the wavelength of the electromagnetic wave to be absorbed is known (see Patent Document 1).
- a radio wave absorber that reduces the distance between the radio wave absorber and the radio wave reflector to a quarter of the absorption frequency will be 10 cm to lm or more when the radio wave to be absorbed is in the VHF band.
- an insulating substrate having a conductive film formed in a striped or lattice shape is disposed between the radio wave absorber and the radio wave reflector, so that the radio wave absorber and the radio wave reflector are separated from each other.
- a radio wave absorptive plate with a large effective dielectric between the two has been proposed (see Patent Document 2).
- Patent Document 3 JP 2001-44750 A
- Patent Document 2 JP-A-10-275998
- Patent Document 2 Japanese Patent Laid-Open No. 2003-8279
- the thickness of the radio wave absorber is 1 / wavelength.
- the size of 4 is required and the thickness is about 31mm.
- this electromagnetic wave absorber is too thick to be attached to a partition of a room or a passage, such as a window of a building.
- an insulating substrate in which a conductive coating is formed in a stripe shape or a lattice shape can be arranged between the radio wave absorber and the radio wave reflector, so that the thickness of the radio wave absorber can be reduced. Complex and difficult to mass produce.
- an impedance layer is provided only on one side, electromagnetic waves cannot be absorbed in both directions. Summary of the Invention
- the present invention has been made in view of such circumstances, and includes a mobile phone, a wireless
- the purpose is to provide a transparent electromagnetic wave absorber that can be sufficiently absorbed in both directions for electromagnetic waves in the frequency range of 1 to 10 GHz used in LAN or ETC.
- the electromagnetic wave absorbing plate according to the present invention is a transparent plate-like dielectric electromagnetic wave absorbing plate.
- the impedance on the incident side determined by the equation (1) Zxi Using this, the thickness of the dielectric is determined so that the electromagnetic wave absorption obtained by Equation (2) is at least 10 dB.
- Equation (1) ⁇ is the complex dielectric constant of the transparent plate, ⁇ is the relative dielectric constant of the transparent plate, is the wavelength of the electromagnetic wave, and d is the thickness of the dielectric. (M: meter) and Zr is the input impedance on the dielectric side.
- Equation (2) ⁇ is the reflection coefficient of the electromagnetic wave on the surface of the dielectric obtained by (Zxi-l) / (Zxi + l).
- the electromagnetic wave absorbing plate according to the present invention has a simple configuration, 1 to: a transparent electromagnetic wave absorbing plate that functions effectively in a frequency range of 10 GHz, particularly, wireless LAN frequencies 2. 45 GHz and 5.2 GHz. It is possible to provide a transparent electromagnetic wave absorbing plate effective for 5.8 GHz and ETC.
- FIG. 1 is a cross-sectional view of an electromagnetic wave absorbing plate using a single glass plate according to the present invention.
- FIG. 3 is a conceptual diagram for calculating the arrival direction of electromagnetic waves absorbed by the electromagnetic wave absorbing plate according to the present invention and the electromagnetic wave absorption capacity.
- FIG. 4 is an equivalent circuit diagram for calculating the impedance of the dielectric.
- FIG. 5 A graph showing the relationship between the area resistance of a dielectric and the amount of electromagnetic waves absorbed at a frequency of 5.2 GHz when the thickness of the glass sheet is 11 mm.
- FIG. 6 A diagram showing that the absorption performance is exhibited by the cancellation effect (phase difference effect) of the incident wave and the reflected wave.
- FIG. 7 is a view showing a measuring device for electromagnetic wave absorption performance.
- the frequency at which the electromagnetic wave absorbing plate according to the present invention is effective is approximately 1 to 10 GHz, 800 MHz for mobile phones:! GHz, 1.5 GHz band, 1.9 GHz band for PHS (Personal Handyphone System) phones.
- the electromagnetic wave absorbing plate according to the present invention is formed of a transparent plate-like dielectric.
- a transparent plate-like dielectric is a transparent plate formed by laminating one or more transparent dielectrics 1 or two or more transparent dielectrics with an intermediate film as shown in FIG.
- FIG. 2 shows a transparent plate in which two dielectrics are laminated with an intermediate film, and FIG. 2 shows two dielectrics 1 and 1 ′ laminated with an intermediate film 2.
- various glass plates such as soda-lime glass, aluminosilicate glass, borosilicate glass, and various transparent plastic plates such as polycarbonate plate and acrylic plate can be used.
- Two or more dielectrics can be laminated using an intermediate film such as polyvinyl butyral or EVA (Ethylene-vinyl acetate copolymer), and the same kind of dielectric may be laminated.
- EVA Ethylene-vinyl acetate copolymer
- a plate glass and a plastic plate may be laminated.
- FIG. 3 is a diagram for explaining a method for obtaining the impedance of the electromagnetic wave absorbing plate.
- FIG. 3 the impedance of the transparent dielectric (area resistance: ⁇ / port) Zr is shown in FIG. C obtained from the following equation (3) from the circuit diagram
- D in the above equation (3) is the area resistance ( ⁇ / port) of the dielectric, and 377 is the characteristic impedance of air.
- Equation (1) ⁇ is the complex dielectric constant of the transparent plate, ⁇ is the relative dielectric constant of the transparent plate, is the wavelength of the electromagnetic wave, and d is the thickness of the dielectric (m: Zr is the input impedance on the dielectric side.
- U is the wavelength of the electromagnetic wave, and d is the thickness (m) of the transparent plate.
- the reflection coefficient ⁇ of the electromagnetic wave reflected from the surface of the transparent plate-like body is a value obtained by the following equation (4):
- the absorption amount Ai can be obtained by the following equation (2) c
- the electromagnetic wave absorption performance is at least lOdB (electromagnetic energy is attenuated to 1/10), it is sufficient for electromagnetic waves with weak output such as mobile phone, indoor LAN or ETC, and electromagnetic wave absorption. It can be used effectively as a board.
- the electromagnetic wave absorption performance for the frequency range of 1 to 10 GHz is as shown in Tables 1 to 4, and the thickness of the plate glass is required to obtain an electromagnetic wave absorption performance of 10 dB or more. It is desirable that the thickness is 9 mm or more, and for practical use in openings such as windows, the thickness is preferably 25 mm or less.
- the amount of electromagnetic wave absorbed was calculated with the area resistance of the glass being 10 14 ⁇ / port.
- Table 1 shows the thickness of the glass plate at which the absorption performance is 10 dB or more with respect to the wireless LAN frequency of 2.45 GHz.
- the thickness of the glass plate is 2:! ⁇ 25
- a range of 5 mm is preferable.
- the thickness of the glass plate is 22.3 to 24. Omm because an absorption performance of 20 dB or more can be obtained.
- Table 2 shows the thickness of the glass plate at which the absorption performance is 10 dB or more with respect to the wireless LAN frequency of 5.2 GHz.
- the thickness of the glass plate be in the range of 10 to 12 mm for the 5.2 GHz frequency of the wireless LAN.
- the thickness of the glass plate it is preferable to set the thickness of the glass plate to 10. 6-11.3 mm, since an absorption performance of 20 dB or more can be obtained. Even when the above glass plate was turned upside down, the performance values were the same as in Table 2. In other words, it was confirmed that there is electromagnetic wave absorption performance in both directions.
- FIG. 5 shows the electromagnetic wave absorption performance obtained by the equation (3) for an electromagnetic wave having a frequency of 5.2 GHz when the sheet resistance of the dielectric surface having a thickness of 11 mm is changed.
- Fig. 5 shows that the electromagnetic wave absorption does not change while maintaining the maximum value when the area resistance of the dielectric is 10 5 ⁇ / ⁇ (100 ⁇ ⁇ / port) or more. Therefore, when the dielectric thickness is 11 mm, the dielectric sheet resistance is desirably 10 5 ⁇ / mouth or more.
- Figure 6 shows that, based on the results of Figure 5 and the calculation result of (2), a glass thickness of 11 mm at 5.2 GHz.
- Table 3 shows the thickness of the glass plate at which the absorption performance is 10 dB or more with respect to the ETC frequency of 5.8 GHz.
- the thickness of the glass plate may be in the range of 9 to: 1 lmm and 18.5 to 20.6 mm.
- Table 4 shows the thickness of the glass plate with the absorption positive of 10 dB or more in the simultaneous absorption type of 2.45 GHz and 5.2 GHz in the wireless LAN band.
- the thickness of the glass plate is preferably in the range of 21.0-23. Omm for the simultaneous absorption type frequencies of 2.45 GHz and 5.2 GHz in the wireless LAN band.
- Electromagnetic wave absorbing plates having different configurations and having different dielectric thicknesses were produced.
- the network analyzer 10 is used to transmit electromagnetic waves from the transmitting antenna 12 installed in the arched frame 13, and the reflection amount of the electromagnetic waves reflected by the electromagnetic wave absorbing plate 16 or a metal plate (not shown) is measured. Measure with a network analyzer using the receiving antenna 12 '. A horn antenna was used for both the transmitting and receiving antennas.
- the amount of reflection on the glass surface is measured, the amount of reflection on the metal plate made of aluminum is measured, and then the amount of reflection on the electromagnetic wave absorbing plate is measured.
- the difference from the reflection amount of the shielding plate was calculated as the electromagnetic wave absorption amount of the electromagnetic shielding plate.
- the amount of reflection of the electromagnetic shielding plate is measured by measuring the amount of reflection from the glass surface and reducing the influence of reflection from the floor and other surfaces.
- a sample table 15 made of foamed polyurethane was placed, and an electromagnetic wave absorbing plate for measurement was placed on the sample table 15. Further, the measurement was performed by surrounding the periphery with the existing electromagnetic wave absorber 14.
- Samples 1 to 4 shown in Table 5 are electromagnetic wave absorbing plates prepared for use in the 2.45 GHz frequency band of wireless LAN. As shown in Table 1, the dielectric thickness is selected from 21. Omm, 22.5 mm and 25.5 mm from Table 1. 2. Further, the dielectric with the maximum absorption in the 45 GHz frequency band. An electromagnetic wave absorbing plate having a thickness of 23.5 mm was prepared.
- Each electromagnetic wave absorbing plate of Samples 1 to 4 was measured for the amount of electromagnetic wave absorbed with respect to an electromagnetic wave of 2.45 GHz using the measuring apparatus shown in FIG.
- a box using the electromagnetic shielding plates of Samples 1 to 4 was prepared.
- a laptop was placed in the box. It is confirmed that a wireless LAN connection was attempted from a laptop computer installed in the box to a server outside the box in a frequency band of 2.45 GHz, and electromagnetic waves from the server were not transmitted through the box. Therefore, it was confirmed that the electromagnetic wave absorbing plates of Samples 1 to 4 had a practical level of electromagnetic wave absorbing performance.
- Samples 5 to 7 shown in Table 6 are electromagnetic wave absorbing plates manufactured for use in the 5.2 GHz frequency band of wireless LAN. Dielectric thickness 10. Omm and 12. Omm were selected from Table 2. In addition, an electromagnetic wave absorbing plate with the maximum absorption in the 5.2 GHz frequency band was fabricated. For Samples 5 to 7, as shown in Table 6, the amount of electromagnetic wave absorption obtained by calculation and the amount of electromagnetic wave absorption measured for 5.2 GHz electromagnetic wave agreed well. In addition, the above Even when the glass plate was turned upside down, the performance values were the same as in Table 6. In other words, it was confirmed that there was electromagnetic wave absorption performance in both directions.
- Samples 8 to 11 shown in Table 7 are electromagnetic wave absorbing plates prepared for use in the 5.8 GHz frequency band of ETC, and have dielectric thicknesses of 9. Omm, 9.5 mm, 11. Omm and 20 5mm was chosen from Table 3. Samples 8 to 11: Even though 5.8, the electromagnetic wave absorption amount at 8 GHz was in good agreement with the measured value as shown in Table 7. Furthermore, even when the above glass plate was turned upside down, the performance values were the same as in Table 7. In other words, it was confirmed that there was electromagnetic wave absorption performance in both directions.
- Sample 12 shown in Table 8 is a glass plate having an absorption performance power of 3 ⁇ 40 dB or more shown in Table 3 for an ETC frequency of 5.8 GHz.
- Sample 13 has an absorption of 20 dB.
- An electromagnetic wave absorbing plate having a thickness of 0.063 mm thinner than Sample 12 and having a thickness of 9.63 mm was prepared.
- 4mm plate glass and 5mm plate glass were combined with PVB (Polyvinyl Butyral) film to adjust the plate thickness to 9.70 mm.
- the thickness of the 10 mm plate glass was adjusted by touch polish polishing to 9.63 mm.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Building Environments (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/792,813 US7623058B2 (en) | 2004-12-28 | 2005-12-22 | Electromagnetic wave absorbing plate |
EP05819696A EP1852940A4 (en) | 2004-12-28 | 2005-12-22 | ELECTROMAGNETIC WAVES ABSORBING PLATE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-378869 | 2004-12-28 | ||
JP2004378869A JP2006186725A (ja) | 2004-12-28 | 2004-12-28 | 電磁波吸収板 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006070696A1 true WO2006070696A1 (ja) | 2006-07-06 |
Family
ID=36614813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/023644 WO2006070696A1 (ja) | 2004-12-28 | 2005-12-22 | 電磁波吸収板 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7623058B2 (ja) |
EP (1) | EP1852940A4 (ja) |
JP (1) | JP2006186725A (ja) |
KR (1) | KR100886064B1 (ja) |
WO (1) | WO2006070696A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8462039B2 (en) * | 2009-12-09 | 2013-06-11 | Electronics And Telecommunications Research Institute | Indoor electromagnetic environment implementing structure and a constructing method thereof |
JP6184579B2 (ja) * | 2015-12-14 | 2017-08-23 | 日東電工株式会社 | 電磁波吸収体およびそれを備えた電磁波吸収体付成形体 |
US10267904B2 (en) * | 2017-08-08 | 2019-04-23 | The United States of America, as Represented by the Secretary of Homeland Security | Artificial skin and human phantom for use in active millimeter wave imaging systems |
US10254170B2 (en) * | 2017-08-08 | 2019-04-09 | The United States of America, as Represented by the Secretary of Homeland Security | Contrast phantoms and uses thereof for active millimeter wave imaging systems |
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JP2002121842A (ja) | 2000-10-13 | 2002-04-26 | Takenaka Komuten Co Ltd | 電波吸収材の補強構造 |
JP2002185180A (ja) * | 2000-12-18 | 2002-06-28 | Daido Steel Co Ltd | 斜め入射に備えた電磁波吸収体 |
JP2002314285A (ja) * | 2001-04-18 | 2002-10-25 | Fujita Corp | 電磁波吸収体 |
JP2003008279A (ja) | 2001-06-27 | 2003-01-10 | C Tekku:Kk | 透過型電波吸収装置 |
JP2003060383A (ja) | 2001-08-16 | 2003-02-28 | Daido Steel Co Ltd | 電磁波吸収シート |
JP2003133784A (ja) | 2001-10-26 | 2003-05-09 | Nitto Denko Corp | 電磁波吸収材料及び電磁波吸収体 |
JP2003289220A (ja) | 2001-11-27 | 2003-10-10 | Tdk Corp | 透光性電波吸収仕切壁 |
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JPH1013083A (ja) * | 1996-06-27 | 1998-01-16 | Tosoh Corp | 電磁波吸収体 |
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JPH10275998A (ja) | 1997-03-31 | 1998-10-13 | Sanyo Electric Co Ltd | 電子部品収納トレイの固定用パレット |
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- 2004-12-28 JP JP2004378869A patent/JP2006186725A/ja active Pending
-
2005
- 2005-12-22 WO PCT/JP2005/023644 patent/WO2006070696A1/ja active Application Filing
- 2005-12-22 EP EP05819696A patent/EP1852940A4/en not_active Withdrawn
- 2005-12-22 US US11/792,813 patent/US7623058B2/en not_active Expired - Fee Related
- 2005-12-22 KR KR1020077017176A patent/KR100886064B1/ko not_active IP Right Cessation
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JP2002121842A (ja) | 2000-10-13 | 2002-04-26 | Takenaka Komuten Co Ltd | 電波吸収材の補強構造 |
JP2002185180A (ja) * | 2000-12-18 | 2002-06-28 | Daido Steel Co Ltd | 斜め入射に備えた電磁波吸収体 |
JP2002314285A (ja) * | 2001-04-18 | 2002-10-25 | Fujita Corp | 電磁波吸収体 |
JP2003008279A (ja) | 2001-06-27 | 2003-01-10 | C Tekku:Kk | 透過型電波吸収装置 |
JP2003060383A (ja) | 2001-08-16 | 2003-02-28 | Daido Steel Co Ltd | 電磁波吸収シート |
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Title |
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See also references of EP1852940A4 |
Also Published As
Publication number | Publication date |
---|---|
JP2006186725A (ja) | 2006-07-13 |
EP1852940A4 (en) | 2011-03-23 |
KR100886064B1 (ko) | 2009-02-26 |
EP1852940A1 (en) | 2007-11-07 |
US20070296624A1 (en) | 2007-12-27 |
US7623058B2 (en) | 2009-11-24 |
KR20070089251A (ko) | 2007-08-30 |
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