WO2022210210A1 - 高周波拡散シート - Google Patents

高周波拡散シート Download PDF

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Publication number
WO2022210210A1
WO2022210210A1 PCT/JP2022/013710 JP2022013710W WO2022210210A1 WO 2022210210 A1 WO2022210210 A1 WO 2022210210A1 JP 2022013710 W JP2022013710 W JP 2022013710W WO 2022210210 A1 WO2022210210 A1 WO 2022210210A1
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WO
WIPO (PCT)
Prior art keywords
diffusion sheet
electromagnetic wave
frequency diffusion
wave shielding
shielding layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/013710
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English (en)
French (fr)
Japanese (ja)
Inventor
俊明 渡邊
猛 八月朔日
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Bakelite Co Ltd
Original Assignee
Sumitomo Bakelite Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Bakelite Co Ltd filed Critical Sumitomo Bakelite Co Ltd
Priority to EP22780424.2A priority Critical patent/EP4318809A4/en
Priority to US18/278,189 priority patent/US20240324159A1/en
Priority to JP2022536862A priority patent/JP7197061B1/ja
Publication of WO2022210210A1 publication Critical patent/WO2022210210A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/526—Electromagnetic shields
    • 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
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective

Definitions

  • the present invention relates to a high frequency diffusion sheet.
  • Electromagnetic waves in such a high frequency range have higher straightness (directivity) than those in the low frequency range. Therefore, when electromagnetic waves are received by a communication device inside a building, the electromagnetic waves that have passed through transmission areas such as windows that allow the transmission of electromagnetic waves are not diffused or diffracted. , there arises a problem that it becomes impossible to receive electromagnetic waves satisfactorily.
  • An object of the present invention is to provide a high-frequency diffusion sheet that enables communication devices to receive electromagnetic waves even if they are in the high-frequency range over a wide area in a building by diffusing the electromagnetic waves in the high-frequency range. It is in.
  • a high-frequency diffusion sheet that is used to diffuse electromagnetic waves in a high-frequency range and includes an electromagnetic wave shielding layer having electromagnetic wave shielding properties, A high-frequency diffusion sheet, wherein the electromagnetic wave shielding layer is patterned in plan view of the high frequency diffusion sheet, and has an opening penetrating through the electromagnetic wave shielding layer in a thickness direction.
  • the electromagnetic wave shielding layer is a metal thin film layer or a metal powder-containing adhesive layer composed of a metal powder and a binder resin.
  • the electromagnetic wave shielding layer includes a material exhibiting semi-transparency or opaqueness, and has a plurality of through-holes penetrating in the thickness direction of the electromagnetic wave shielding layer formed with a finer size than the openings.
  • the present invention when an electromagnetic wave in a high frequency region is transmitted through the high frequency diffusion sheet, it can be reliably diffused by diffracting the electromagnetic wave at the opening provided in the high frequency diffusion sheet. Therefore, by attaching a high-frequency diffusion sheet to a transmission region such as a window of a building (building) that allows transmission of electromagnetic waves, when the electromagnetic wave is transmitted through the transmission region to which the high-frequency diffusion sheet is attached, Even an electromagnetic wave in a high frequency range can be reliably diffused by the diffraction. Therefore, in a wide area inside the building, the communication device can receive the electromagnetic wave satisfactorily.
  • FIG. 1 is a plan view showing a first embodiment of the high frequency diffusion sheet of the present invention.
  • FIG. 2 is a cross-sectional view taken along line AA shown in FIG. 3 is a plan view showing another configuration of openings in the electromagnetic wave shielding layer provided in the high frequency diffusion sheet of FIG. 1.
  • FIG. 4 is a plan view showing a second embodiment of the high frequency diffusion sheet of the present invention.
  • 5A and 5B are diagrams showing a test specimen used for evaluation of diffraction of electromagnetic waves (FIG. 5A is a plan view and FIG. 5B is a cross-sectional view taken along the line BB of FIG. 5A).
  • FIG. 1 is a plan view showing a first embodiment of the high-frequency diffusion sheet of the present invention
  • FIG. 2 is a cross-sectional view taken along line AA shown in FIG.
  • the front side of the paper surface in FIG. 1 is called “upper”
  • the back side of the paper surface is called “lower”
  • the vertical direction in FIGS. 1 and 2 is called the Y direction
  • the horizontal direction is called the X direction.
  • the dimensions in the left-right direction and/or the thickness direction are exaggerated, and are greatly different from the actual dimensions.
  • the high-frequency diffusion sheet 10 of the present invention is used for diffusing electromagnetic waves in a high-frequency region and includes an electromagnetic wave shielding layer 11 having electromagnetic wave shielding properties. It is patterned and has openings 15 penetrating through the electromagnetic wave shielding layer 11 in the thickness direction.
  • the high frequency diffusion sheet 10 By making the high-frequency diffusion sheet 10 have such a configuration, that is, by making the electromagnetic wave shielding layer 11 having electromagnetic wave shielding properties have openings 15 penetrating in the thickness direction, the high frequency diffusion sheet 10 can be When an electromagnetic wave in a high frequency region is transmitted, the electromagnetic wave can be reliably diffracted and diffused at the opening 15 . Therefore, by attaching the high-frequency diffusion sheet 10 to a transmission region such as a window provided in a building (building) where transmission of electromagnetic waves is allowed, the transmission of electromagnetic waves in the transmission region to which the high-frequency diffusion sheet 10 is attached can be prevented. Moreover, even if the electromagnetic wave is in a high frequency range, the electromagnetic wave can be reliably diffused by diffracting the electromagnetic wave at the opening 15 . Therefore, in a wide area inside the building, the communication device can receive the electromagnetic wave satisfactorily.
  • the high-frequency diffusion sheet 10 may be attached directly to the windows of the building (building), or may be attached to curtains, blinds, or the like arranged corresponding to the windows. Even by sticking, the high-frequency diffusion sheet 10 can diffuse electromagnetic waves when the electromagnetic waves pass through the window.
  • the high-frequency diffusion sheet 10 including the electromagnetic wave shielding layer 11 having the openings 15 will be described below.
  • the high-frequency diffusion sheet 10 has an electromagnetic shielding layer 11 having electromagnetic shielding properties and a resin film 12 supporting the electromagnetic shielding layer 11, as shown in FIGS.
  • the resin film 12 is attached to the electromagnetic wave shielding layer 11 to support the electromagnetic wave shielding layer 11 and to maintain the stability of the shape of the high frequency diffusion sheet 10. , and those having transparency are preferably used.
  • the resin film 12 examples include thermosetting resins such as polyimide resin, polyamide resin, and epoxy resin; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; olefin resins such as polypropylene and cycloolefin polymer; Examples include those composed mainly of acrylic resins such as methyl methacrylate, thermoplastic resins such as polycarbonate resins, and the like, and these are preferably used because they have transparency.
  • the average thickness of the resin film 12 is not particularly limited, it is preferably 0.01 mm or more and 0.40 mm or less, and more preferably 0.10 mm or more and 0.30 mm or less. By setting the average thickness of the resin film 12 within this range, the electromagnetic wave shielding layer 11 can be reliably supported by the resin film 12 .
  • the electromagnetic wave shielding layer 11 has openings 15 penetrating in its thickness direction, and is laminated on the resin film 12 in a layered overall shape. It has an electromagnetic wave shielding property of suppressing or shielding the transmission of the electromagnetic wave, and has a function of allowing the transmission of the electromagnetic wave in the region where the opening 15 is formed.
  • the electromagnetic shielding layer 11 is not particularly limited, and may shield electromagnetic waves in any form in a region where the openings 15 are not formed. a reflective layer that preferentially shields (blocks) the electromagnetic waves from the electromagnetic wave shielding layer 11; Among these, the electromagnetic wave shielding layer 11 is preferably a reflective layer. As a result, the electromagnetic waves incident on the electromagnetic wave shielding layer 11 can be effectively shielded by reflecting the electromagnetic waves.
  • the electromagnetic wave shielding layer 11 may shield electromagnetic waves by either reflecting or absorbing incident electromagnetic waves.
  • a layer that preferentially reflects and shields electromagnetic waves is called a reflective layer
  • a layer that preferentially absorbs and shields electromagnetic waves is called an absorption layer.
  • the reflective layer and the absorbing layer will be described below.
  • the reflective layer predominantly blocks the reflection of electromagnetic waves incident on the reflective layer.
  • the reflective layer examples include a metal powder-containing adhesive layer, a metal thin film layer, a metal mesh, and a surface treatment of a conductive material such as ITO. These may be used alone or in combination. Among these, it is preferable to use a metal powder-containing adhesive layer and a metal thin film layer.
  • the metal powder-containing adhesive layer and the metal thin film layer exhibit excellent electromagnetic wave shielding properties even when the film thickness (thickness) is set to be relatively thin, and thus are preferably used as the reflective layer.
  • the metal powder-containing adhesive layer contains metal powder and a binder resin, and the metal powder includes, for example, gold, silver, copper, silver-coated copper, nickel, and the like. Among these, it is preferable to use silver because it is excellent in electromagnetic wave shielding properties.
  • the content ratio of the metal powder and the binder resin in the metal powder-containing adhesive layer is not particularly limited, but the weight ratio is preferably 40:60 to 95:5, more preferably 50:50 to 90:10. more preferred.
  • the metal powder-containing adhesive layer may further contain a flame retardant, a leveling agent, a viscosity modifier, etc. in addition to the metal powder and the binder resin.
  • Examples of the metal thin film layer include vapor-deposited films, metal foils, etc., which are mainly composed of the metals listed in the metal powder contained in the metal powder-containing adhesive layer.
  • the absorption layer absorbs the electromagnetic waves incident on the absorption layer and shields them from being converted into thermal energy.
  • the absorption layer examples include a conductive absorption layer mainly composed of a conductive absorption material such as metal powder and a conductive polymer material, and a dielectric absorption layer mainly composed of a dielectric absorption material such as a carbon-based material and a conductive polymer material.
  • a dielectric absorption layer composed of a dielectric absorption layer examples include a dielectric absorption layer composed of a dielectric absorption layer, a magnetic absorption layer composed mainly of a magnetic absorption material such as a soft magnetic metal, etc., and these may be used alone or in combination. Those constructed are preferably used.
  • the conductive absorption layer absorbs electromagnetic waves by converting electromagnetic energy into thermal energy due to the current that flows inside the material when an electric field is applied, and the dielectric absorption layer converts electromagnetic waves into thermal energy through dielectric loss.
  • the magnetic absorption layer absorbs the electromagnetic wave by converting the energy of the radio wave into heat and consuming it due to magnetic losses such as overcurrent loss, hysteresis loss, and magnetic resonance.
  • examples of the conductive absorption material include conductive polymers, metal oxides such as ATO, and conductive ceramics.
  • conductive polymers include, for example, polyacetylene, polypyrrole, PEDOT (poly-ethylenedioxythiophene), PEDOT/PSS, polythiophene, polyaniline, poly(p-phenylene), polyfluorene, polycarbazole, polysilane, derivatives thereof, and the like. One or more of these can be used in combination.
  • dielectric absorption materials include carbon-based materials, conductive polymers, and ceramic materials.
  • Carbon-based materials include, for example, carbon nanotubes such as single-walled carbon nanotubes and multi-walled carbon nanotubes, carbon nanofibers, CN nanotubes, CN nanofibers, BCN nanotubes, BCN nanofibers, graphene, carbon microcoils, carbon Carbon such as nanocoils, carbon nanohorns, and carbon nanowalls can be used, and one or more of these can be used in combination.
  • Ceramic materials include barium titanate, perovskite-type barium zirconate titanate calcium crystal particles, titania, alumina, zirconia, silicon carbide, and aluminum nitride. be able to.
  • magnetic absorbing materials include, for example, iron, silicon steel, magnetic stainless steel (Fe--Cr--Al--Si alloy), sendust (Fe--Si--Al alloy), permalloy (Fe--Ni alloy), silicon copper (Fe --Cu--Si alloys), Fe--Si alloys, Fe--Si--B (--Cu--Nb) alloys and other soft magnetic metals, and ferrites.
  • thermosetting resins such as thermosetting elastomers, olefin resins, polyamide resins, polyimide resins, acrylic resins, polyester resins, vinyl chloride resins, styrene resins, styrene-based thermoplastic elastomers, thermoplastics such as olefin-based thermoplastic elastomers
  • Thermoplastic resins such as elastomers may be used, and one or more of these may be used in combination.
  • the average thickness T of the reflective layer and the absorbing layer that is, the average thickness T of the electromagnetic wave shielding layer 11 is not particularly limited, but is preferably 0.01 ⁇ m or more and 70.0 ⁇ m or less, and preferably 1.0 ⁇ m or more and 70.0 ⁇ m. It is more preferably 10.0 ⁇ m or more and 40.0 ⁇ m or less.
  • the opening 15 is a through hole provided through the electromagnetic wave shielding layer 11 in the thickness direction.
  • an opening 15 for example, when an electromagnetic wave (plane wave WA) in a high frequency region (frequency: about 1 GHz to 80 GHz) is incident on the electromagnetic wave shielding layer 11, through this opening 15, When electromagnetic waves pass through the electromagnetic wave shielding layer 11 , the electromagnetic waves are diffracted and diffused at the openings 15 . Therefore, by attaching the high-frequency diffusion sheet 10 to a permeable area, such as a window of a building (building), through which electromagnetic waves are allowed to pass, electromagnetic waves in a high-frequency range can be effectively transmitted by a communication device over a wide area within the building. (See FIG. 2).
  • a permeable area such as a window of a building (building)
  • the width W of the opening 15 is set equal to or less than the wavelength of the electromagnetic wave transmitted through the opening 15 . That is, when the wavelength of the electromagnetic wave is ⁇ [mm], the width W of the opening 15 is preferably 1.0 or less, and more preferably 0.8 or less. As a result, when electromagnetic waves pass through the electromagnetic wave shielding layer 11 , the electromagnetic waves can be diffused by being diffracted more reliably by the openings 15 . W/ ⁇ is preferably 0.3 or more, more preferably 0.5 or more. As a result, when electromagnetic waves pass through the electromagnetic wave shielding layer 11 , the electromagnetic waves can be diffused by being diffracted more reliably by the openings 15 .
  • the number of openings 15 in the electromagnetic wave shielding layer 11 in this embodiment is not limited, but in this embodiment, the openings 15 are arranged in the X direction (lateral direction of the openings 15). 9 rows are arranged at equal intervals along the Y direction (the longitudinal direction of the opening 15), and 3 rows are arranged at equal intervals along the Y direction (longitudinal direction of the opening 15), forming a total of 27 (plural).
  • each opening 15 has a long shape, that is, a rectangular shape that extends linearly along the Y direction (longitudinal direction of the opening 15), has the same length, and has the same width. W are also the same as each other.
  • the distance L is preferably 0.2 or more and 1.3 or less, more preferably 0.4 or more and 1 or less.
  • the electromagnetic waves in the high-frequency region can be uniformly diffracted in the electromagnetic wave shielding layer 11 by the openings 15 .
  • the shape of the opening 15 is rectangular, ie, linear in plan view, but is not limited to this as long as the width W is set to be smaller than the wavelength of the electromagnetic wave.
  • Other shapes of 15 include, for example, a circular shape as shown in FIG. Shapes having corners such as a shape, an X shape, an L shape, an H shape, a T shape, a W shape, and a U shape can be mentioned.
  • the diameter D of the circle corresponds to the width W when the shape of the opening 15 is rectangular.
  • the shortest distance between adjacent circles is handled in the same manner as the separation distance L between the openings 15 adjacent in the X direction when the openings 15 are rectangular in shape.
  • the openings 15 having the same shape are formed in the electromagnetic wave shielding layer 11 at regular intervals.
  • the present invention is not limited to this. They may have shapes different from each other, or may be randomly arranged on the electromagnetic wave shielding layer 11 .
  • the opening 15 is not limited to the case where a plurality of electromagnetic wave shielding layers 11 are provided, and at least one electromagnetic wave shielding layer 11 may be provided.
  • the high-frequency diffusion sheet 10 may include an adhesive layer laminated on the surface of the resin film 12 opposite to the electromagnetic wave shielding layer 11 . This makes it possible to easily attach the high-frequency diffusion sheet 10 to a transmission region such as a window of a building (building) that permits the transmission of electromagnetic waves.
  • this adhesive layer is not particularly limited, for example, it is preferably mainly composed of an adhesive composed of at least one of an acrylic adhesive, a silicone adhesive, a rubber adhesive, and the like.
  • acrylic pressure-sensitive adhesives include resins composed of (meth)acrylic acid and their esters, (meth)acrylic acid and their esters, and unsaturated monomers copolymerizable therewith (for example, vinyl acetate , styrene, acrylonitrile, etc.). Moreover, what mixed two or more types of these resins is mentioned.
  • rubber adhesives include natural rubber, isoprene rubber, styrene-butadiene, recycled rubber, polyisobutylene, and rubbers such as styrene-isoprene-styrene and styrene-butadiene-styrene. Those mainly composed of a block copolymer containing
  • silicone-based adhesives include dimethylsiloxane-based and diphenylsiloxane-based adhesives.
  • additives such as plasticizers, tackifiers, thickeners, fillers, anti-aging agents, preservatives, anti-mold agents, dyes and pigments are added to the adhesive layer as necessary.
  • the high-frequency diffusion sheet 10 includes one resin film 12 on one side of the electromagnetic wave shielding layer 11.
  • the present invention is not limited to this. It may be provided on both one surface side and the other surface side of the layer 11, or the formation of the resin film 12 may be omitted.
  • the high-frequency diffusion sheet 10 may further include an intermediate layer or the like between at least one of the electromagnetic wave shielding layer 11 and the resin film 12 and between the resin film 12 and the adhesive layer.
  • FIG. 4 is a plan view showing a second embodiment of the high frequency diffusion sheet of the present invention.
  • 4(a) is an overall view of the high-frequency diffusion sheet of the second embodiment
  • FIG. 4(b) is a high-frequency diffusion sheet located in the area [B] enclosed by the dotted line in FIG. 4(a).
  • 2 is a partially enlarged plan view in which the .
  • the high-frequency diffusion sheet 10 of the second embodiment will be described with a focus on the differences from the high-frequency diffusion sheet 10 of the first embodiment, and the description of the same items will be omitted.
  • the high frequency diffusion sheet 10 shown in FIG. 4 is the same as the high frequency diffusion sheet 10 of the first embodiment shown in FIG.
  • the electromagnetic wave shielding layer 11 has a finer size than the openings 15 in the regions where the openings 15 are not formed, that is, the regions that suppress or block the transmission of electromagnetic waves. It has a plurality of through-holes 16 that penetrate in the thickness direction of the electromagnetic wave shielding layer 11 .
  • the high-frequency diffusion sheet 10 of the present invention is used by being attached to a transmission region, such as a window of a building (building), through which electromagnetic waves are allowed to pass. Transparency may be required for such transmissive regions.
  • the electromagnetic wave shielding layer 11 contains, as a main material, a material exhibiting electromagnetic wave shielding properties in order to suppress or shield transmission of electromagnetic waves in regions where the openings 15 are not formed.
  • a material exhibiting this electromagnetic shielding property may exhibit translucence or opacity.
  • the electromagnetic wave shielding layer 11 includes: In a region where the opening 15 is not formed, a plurality of through-holes 16 are formed to have a finer size than the opening 15 and penetrate in the thickness direction. As a result, even when the electromagnetic wave shielding layer 11 contains a material exhibiting translucency or opaqueness, visible light is allowed to pass through the through-holes 16. Therefore, the electromagnetic wave shielding layer 11, i. Transparency can be reliably imparted to the sheet 10. - ⁇
  • the through hole 16 may have any shape and size as long as it is formed with a finer size than the opening 15 so as to allow the transmission of visible light while suppressing the transmission of electromagnetic waves.
  • the width Wh of the through-hole 16 is specifically preferably about 50 ⁇ m or more and less than 1000 ⁇ m, and is about 100 ⁇ m or more and 250 ⁇ m or less. is more preferable.
  • the distance Lh between the through-holes 16 is, for example, preferably about 10 ⁇ m or more and 150 ⁇ m or less, and more preferably about 30 ⁇ m or more and 75 ⁇ m or less.
  • the through holes 16 each have a square shape in a plan view, but the through holes 16 are not limited to this shape.
  • shape for example, S-shape, U-shape, circular shape, semi-circular shape, shape having a curved part such as wavy shape, linear shape, V-shape, X-shape, L-shape, H-shape , T-shape, W-shape, and U-shape.
  • the through holes 16 having the same shape are formed in the electromagnetic wave shielding layer 11 at regular intervals, but the present invention is not limited to this. They may have shapes different from each other, or may be randomly arranged on the electromagnetic wave shielding layer 11 .
  • the high-frequency diffusion sheet 10 of the second embodiment can also provide the same effects as those of the first embodiment.
  • the dimensions of each part are the same as those of the high-frequency diffusion sheet 10 of the first embodiment.
  • the light transmittance of visible light at a wavelength of 300 nm or more and 800 nm or less is 70% or more and 100% or less. , and more preferably 90% or more and 100% or less.
  • the high-frequency diffusion sheet 10 can be said to have excellent translucency, and when the high-frequency diffusion sheet 10 is attached to the window, light from the window into the interior of the building (building) can be seen. It is possible to appropriately suppress or prevent a decrease in light intake efficiency.
  • the light transmittance can be measured by, for example, an ultraviolet-visible spectrophotometer.
  • the present invention is not limited to this.
  • each configuration can be replaced with an arbitrary one that can exhibit the same function, or an arbitrary configuration can be added.
  • ⁇ frame body> As the frame body 100 that does not allow the transmission of electromagnetic waves, an aluminum plate having a square outer shape and an opening (outer shape: 200 mm ⁇ 200 mm, opening: 100 mm ⁇ 100 mm) was prepared.
  • Example No. 1A After cutting the prepared metal foil laminated resin film (aluminum foil-PET base laminate) into a size of 100 mm ⁇ 100 mm, the aluminum foil included in this metal foil laminated resin film was irradiated with a laser to obtain a long length. A total of 10 openings 15 (slits) with a height of 90 mm and a width of 5 mm are provided in the aluminum foil so that the separation distance L (interval) is 5 mm, and the electromagnetic wave shielding layer 11 is formed on the resin film 12 to form the sample. No. A high frequency diffusion sheet 10 of 1A was produced.
  • Sample No. 2A to 10A At least one of the length and width W of the openings 15 formed in the aluminum foil, the distance L between the openings 15, and the number of openings 15 was changed as shown in Table 1.
  • Sample no. Sample no. A high frequency diffusion sheet 10 of 2A to 10A was produced.
  • Sample No. 1 was obtained by omitting the formation of openings 15 in the aluminum foil.
  • a high-frequency diffusion sheet 10 of 11A was prepared.
  • each sample No. The high-frequency diffusion sheet 10 was attached to the frame 100 so as to correspond to the opening provided in the frame 100, thereby obtaining an inspection object 150 for checking the diffraction of electromagnetic waves (see FIG. 5). ).
  • the receiver 20 was arranged so that the distance from the end of the frame 100 in the plane direction was 10 mm and the distance from the frame 100 in the thickness direction was 10 mm. .
  • each sample No. An electromagnetic wave (plane wave) with a frequency of 28 GHz was made incident on the high-frequency diffusion sheet 10, and then the electromagnetic wave transmitted through the high-frequency diffusion sheet 10 was received using the receiver 20. Then, the presence or absence of diffraction (diffusion) of electromagnetic waves by the high-frequency diffusion sheet 10 was evaluated based on the following evaluation criteria.
  • the electromagnetic wave shielding layer 11 included in the high frequency diffusion sheet 10 is provided with openings 15 penetrating in the thickness direction.
  • the results show that electromagnetic waves are diffracted and diffused by the openings 15 of the layer 11 .
  • the width W of the openings 15 to be smaller than the wavelength of the electromagnetic wave and appropriately setting the distance L between the openings 15, the electromagnetic waves can be diffused with better diffusibility. became clear.
  • ⁇ frame body> As the frame body 100 that does not allow the transmission of electromagnetic waves, an aluminum plate having a square outer shape and an opening (outer shape: 200 mm ⁇ 200 mm, opening: 100 mm ⁇ 100 mm) was prepared.
  • Example No. 1B Production of high frequency diffusion sheet (Sample No. 1B) After cutting the prepared metal foil laminated resin film (aluminum foil-PET base laminate) into a size of 100 mm ⁇ 100 mm, the aluminum foil included in this metal foil laminated resin film was irradiated with a laser to obtain a long length. A total of 10 openings 15 (slits) having a height of 90 mm and a width of 5 mm were provided in the aluminum foil so that the separation distance L (interval) was 5 mm. After that, square through-holes 16 with a width of Wh of 250 ⁇ m are formed in a grid pattern with a distance of Lh of 50 ⁇ m in a region of the aluminum foil in which the openings 15 are not formed. Sample No. on which the electromagnetic wave shielding layer 11 was provided. A high frequency diffusion sheet 10 of 1B was produced.
  • Sample Nos. 2B to 9B Except that at least one of the width W of the openings 15 formed in the aluminum foil and the distance L between the openings 15 was changed as shown in Table 2, Sample No. Sample No. 1B was prepared in the same manner as in 1B. High-frequency diffusion sheets 10 of 2B to 9B were produced.
  • the receiver 20 was arranged so that the distance from the end of the frame 100 in the plane direction was 10 mm and the distance from the frame 100 in the thickness direction was 10 mm. .
  • each sample No. An electromagnetic wave (plane wave) with a frequency of 28 GHz was made incident on the high-frequency diffusion sheet 10, and then the electromagnetic wave transmitted through the high-frequency diffusion sheet 10 was received using the receiver 20. Then, the presence or absence of diffraction (diffusion) of electromagnetic waves by the high-frequency diffusion sheet 10 was evaluated based on the following evaluation criteria.
  • the electromagnetic wave shielding layer 11 included in the high frequency diffusion sheet 10 is provided with openings 15 penetrating in the thickness direction.
  • the results show that electromagnetic waves are diffracted and diffused by the openings 15 of the layer 11 .
  • sample No. In 1B to 9B the electromagnetic wave diffraction properties of the openings 15 were evaluated for sample Nos. 1 and 2 in Table 1, in which the formation of the through holes 16 in the regions of the electromagnetic wave shielding layer 11 where the openings 15 were not formed was omitted. A trend similar to that of 1A to 10A was shown. Therefore, it was found that electromagnetic waves can be diffracted (diffused) at the openings 15 even if the through-holes 16 are formed in the regions of the electromagnetic wave shielding layer 11 where the openings 15 are not formed.
  • the high-frequency diffusion sheet 10 can be made transparent to visible light by forming the through-holes 16 in the regions of the electromagnetic wave shielding layer 11 where the openings 15 are not formed.
  • Frame preparation As the frame 100 that does not allow transmission of electromagnetic waves, a frame made of an aluminum plate having a square outer shape and a square opening (outer shape: 600 mm ⁇ 600 mm, opening: 300 mm ⁇ 300 mm) was prepared.
  • Example No. 1C Preparation of high frequency diffusion sheet (Sample No. 1C) A PET substrate (resin film 12) melted by heating was laminated on a copper foil having an average thickness of 12 ⁇ m to prepare a copper foil-PET substrate laminate as a metal foil laminated resin film. After cutting the prepared metal foil laminated resin film into a size of 600 mm ⁇ 600 mm, a photosensitive film mask is attached to the copper foil surface of the metal foil laminated resin film, and exposure patterning and development are performed. After development, the copper foil is patterned with a metal etchant.
  • a total of 23 openings 15 (slits) with a length of 300 mm and a width of W7 mm are provided in the copper foil so that the separation distance L (interval) is 6 mm, and the electromagnetic wave shielding layer 11 is formed on the resin film 12.
  • Sample no. A 1C high-frequency diffusion sheet 10 was produced.
  • a copper foil with an average thickness of 12 ⁇ m is bonded onto a PET substrate (resin film 12) with an average thickness of 0.1 mm via an acrylic adhesive, thereby turning the copper foil-PET substrate laminate into a metal foil. It was prepared as a laminated resin film. After cutting the prepared metal foil laminated resin film into a size of 600 mm ⁇ 600 mm, a photosensitive film mask is attached to the copper foil surface of the metal foil laminated resin film, and exposure patterning and development are performed. After development, the copper foil is patterned with a metal etchant.
  • a total of 23 openings 15 (slits) with a length of 300 mm and a width of W7 mm are provided in the copper foil so that the separation distance L (interval) is 6 mm, and the electromagnetic wave shielding layer 11 is formed on the resin film 12.
  • Sample no. A high frequency diffusion sheet 10 of 2C was produced.
  • Example No. 3C After cutting a PET substrate (resin film 12) having an average thickness of 0.1 mm into a size of 600 mm ⁇ 600 mm, copper vapor deposition is performed on the entire surface of the PET substrate to a thickness of 50 nm. After that, a photosensitive film mask is attached to the copper deposition surface, and exposure patterning and development processing are performed. After development, a metal etching process is performed to remove the copper in the openings to provide copper patterning. The photosensitive foam is then removed.
  • the electromagnetic wave shielding layer 11 was formed on the resin film 12 by providing a total of 23 openings 15 (slits) each having a length of 300 mm and a width of 7 mm so that the separation distance L (interval) was 6 mm. A 3C high-frequency diffusion sheet 10 was produced.
  • Example No. 4C After cutting a PET base material (resin film 12) having an average thickness of 0.1 mm into a size of 600 mm ⁇ 600 mm, a photosensitive film mask is attached to the PET base material, followed by exposure patterning and development processing. After development, a vapor deposition layer having a thickness of 50 nm is provided in the opening by a copper vapor deposition treatment. The photosensitive foam is removed after vapor deposition.
  • the electromagnetic wave shielding layer 11 was formed on the resin film 12 by providing a total of 23 openings 15 (slits) each having a length of 300 mm and a width of 7 mm so that the separation distance L (interval) was 6 mm.
  • a 4C high-frequency diffusion sheet 10 was produced.
  • a PET substrate (resin film 12) having an average thickness of 0.1 mm is cut into a size of 600 mm ⁇ 600 mm, and aluminum vapor deposition is performed on the entire PET substrate to a thickness of 50 nm.
  • a photosensitive film mask is attached to the aluminum deposition surface, and exposure patterning and development processing are performed.
  • aluminum is removed from the openings by metal etching to provide aluminum patterning.
  • the photosensitive foam is then removed.
  • the electromagnetic wave shielding layer 11 was formed on the resin film 12 by providing a total of 23 openings 15 (slits) each having a length of 300 mm and a width of 7 mm so that the separation distance L (interval) was 6 mm.
  • a 5C high-frequency diffusion sheet 10 was produced.
  • a PET substrate (resin film 12) having an average thickness of 0.1 mm is cut into a size of 600 mm ⁇ 600 mm, and aluminum vapor deposition is performed on the entire PET substrate to a thickness of 50 nm. After that, a photosensitive film mask is attached to the aluminum deposition surface, and exposure patterning and development processing are performed. After development, aluminum is removed from the openings by metal etching to provide aluminum patterning. The photosensitive foam is then removed. A total of 23 openings 15 (slits) each having a length of 300 mm and a width of 7 mm were provided so that the separation distance L (interval) was 6 mm.
  • the electromagnetic wave shielding layer 11 is formed on the resin film 12 by forming square-shaped through holes 16 having a width of Wh of 250 ⁇ m at intervals of Lh of 50 ⁇ m in a region where the openings 15 of the electromagnetic wave shielding layer 11 are not formed. and sample no. A 6C high-frequency diffusion sheet 10 was produced.
  • Example No. 7C to 11C Except that at least one of the width W of the openings 15, the distance L between the openings 15, and the number of the openings 15 was changed as shown in Table 3, the sample No. Sample no. A high frequency diffusion sheet 10 of 7C to 11C was produced.
  • sample No. 12C Except for changing the width W of the openings 15, the separation distance L, and the number of openings 15 as shown in Table 3, the sample No. Sample no. A high frequency diffusion sheet 10 of 12C was produced.
  • the receiver 20 was arranged so that the distance from the end of the frame 100 in the plane direction was 10 mm and the distance from the frame 100 in the thickness direction was 10 mm. .
  • Electromagnetic waves (plane waves) of frequencies shown in Table 3 were made incident on the high frequency diffusion sheet 10 of No. 2, and then the electromagnetic waves transmitted through the high frequency diffusion sheet 10 were received using the receiver 20 . Then, the presence or absence of diffraction (diffusion) of electromagnetic waves by the high-frequency diffusion sheet 10 was evaluated based on the following evaluation criteria.
  • the light transmittance of visible light at a wavelength of 300 nm or more and 800 nm or less is A: 70% or more.
  • C Less than 50%.
  • the electromagnetic wave shielding layer 11 included in the high frequency diffusion sheet 10 is provided with openings 15 penetrating in the thickness direction.
  • the results show that electromagnetic waves are diffracted and diffused by the openings 15 of the layer 11 .
  • the width W of the openings 15 to be smaller than the wavelength of the electromagnetic wave and appropriately setting the distance L between the openings 15, the electromagnetic waves can be diffused with better diffusibility. became clear.
  • the high-frequency diffusion sheet 10 can be made transparent to visible light when the through-holes 16 are formed in the regions of the electromagnetic wave shielding layer 11 where the openings 15 are not formed.
  • the present invention when an electromagnetic wave in a high frequency region is transmitted through the high frequency diffusion sheet, it can be reliably diffused by diffracting the electromagnetic wave at the opening provided in the high frequency diffusion sheet. Therefore, by attaching a high-frequency diffusion sheet to a transmission region such as a window of a building (building) that allows transmission of electromagnetic waves, when the electromagnetic wave is transmitted through the transmission region to which the high-frequency diffusion sheet is attached, Even an electromagnetic wave in a high frequency range can be reliably diffused by the diffraction. Therefore, in a wide area inside the building, the communication device can receive the electromagnetic wave satisfactorily. Therefore, the present invention has industrial applicability.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Laminated Bodies (AREA)
  • Aerials With Secondary Devices (AREA)
PCT/JP2022/013710 2021-03-29 2022-03-23 高周波拡散シート Ceased WO2022210210A1 (ja)

Priority Applications (3)

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EP22780424.2A EP4318809A4 (en) 2021-03-29 2022-03-23 High frequency diffusion sheet
US18/278,189 US20240324159A1 (en) 2021-03-29 2022-03-23 High frequency diffusion sheet
JP2022536862A JP7197061B1 (ja) 2021-03-29 2022-03-23 高周波拡散シート

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JP2021056247 2021-03-29
JP2021-056247 2021-03-29

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JP2003258543A (ja) * 2002-03-04 2003-09-12 Shimizu Corp 電磁シールドフイルム
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JPWO2022210210A1 (https=) 2022-10-06
EP4318809A1 (en) 2024-02-07
EP4318809A4 (en) 2024-09-25
US20240324159A1 (en) 2024-09-26

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