WO2024135216A1 - Panneau de réflexion, dispositif de réflexion d'ondes électromagnétiques et barrière de réflexion d'ondes électromagnétiques - Google Patents

Panneau de réflexion, dispositif de réflexion d'ondes électromagnétiques et barrière de réflexion d'ondes électromagnétiques Download PDF

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Publication number
WO2024135216A1
WO2024135216A1 PCT/JP2023/042015 JP2023042015W WO2024135216A1 WO 2024135216 A1 WO2024135216 A1 WO 2024135216A1 JP 2023042015 W JP2023042015 W JP 2023042015W WO 2024135216 A1 WO2024135216 A1 WO 2024135216A1
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conductive pattern
layer
thickness
reflective
reflective panel
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PCT/JP2023/042015
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English (en)
Japanese (ja)
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真治 植木
久美子 神原
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Ａｇｃ株式会社
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Publication of WO2024135216A1 publication Critical patent/WO2024135216A1/fr

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  • the present invention relates to a reflective panel, an electromagnetic wave reflective device, and an electromagnetic wave reflective fence.
  • 5G fifth generation mobile communication system
  • IoT Internet of Things
  • 5G radio waves tend to travel in a very straight line, it is necessary to devise a propagation method by installing reflectors such as reflective panels in order to deliver the radio waves to the required areas.
  • Metasurfaces are formed with periodic structures or patterns that are finer than the wavelength, and are designed to reflect electromagnetic waves at a reflection angle different from the angle of incidence (see, for example, Non-Patent Document 1). Metasurfaces can reflect incident electromagnetic waves in a designed direction while maintaining a planar arrangement, so they function effectively as reflectors even in environments where there is not enough space to install a large number of mirror-reflecting reflective panels.
  • Metasurfaces are designed to reflect electromagnetic waves in a specific direction, and it is difficult to reflect incident electromagnetic waves in multiple directions with a certain degree of reflection intensity. Depending on the environment in which the reflective panel is installed, reflection in multiple directions may be required.
  • the present invention aims to provide a reflective panel that reflects incident electromagnetic waves in multiple directions with a certain degree of reflection intensity, and an electromagnetic wave reflection device using the same.
  • a reflective panel that reflects radio waves in a predetermined band selected from a frequency band of 1 GHz or more and 300 GHz or less, A dielectric layer; a periodic conductive pattern provided on one surface of the dielectric layer; a ground layer provided on the other surface of the dielectric layer; an adhesive layer that bonds the conductive pattern to the one surface;
  • the adhesive layer that adheres the conductive pattern is provided with the same area occupancy as the conductive pattern, and the conductive pattern has a thickness greater than 0.1 ⁇ m and less than 10.0 ⁇ m.
  • a reflective panel that reflects radio waves in a predetermined band selected from a frequency band of 1 GHz or more and 300 GHz or less,
  • a dielectric layer a periodic conductive pattern provided on one surface of the dielectric layer; a ground layer provided on the other surface of the dielectric layer; an adhesive layer that bonds the conductive pattern to the one surface of the dielectric layer;
  • the adhesive layer for adhering the conductive pattern is provided with the same area occupancy as the conductive pattern, and the thickness of the adhesive layer is greater than 50 ⁇ m and less than 1500 ⁇ m.
  • a reflective panel that reflects incident electromagnetic waves in multiple directions with a certain degree of reflection strength and an electromagnetic wave reflection device using this have been realized.
  • FIG. 1 is a schematic diagram of an electromagnetic wave reflection device using a reflection panel of an embodiment.
  • 5A to 5C are schematic diagrams illustrating a state of reflection on a reflective panel according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing a first example of a layer structure of a reflective panel.
  • FIG. 13 is a diagram showing a second example of a layer structure of a reflective panel.
  • FIG. 13 is a diagram showing a model of a conductive pattern used for evaluating reflection characteristics.
  • FIG. 6 is a schematic diagram showing the configuration of a unit cell of the model in FIG. 5 .
  • a reflective panel is used to improve the radio wave environment by reflecting incident electromagnetic waves in two or more directions with a certain degree of reflection intensity. More specifically, a reflective panel is provided that simultaneously reflects regular reflection, i.e., in a first direction for specular reflection and in a second direction for non-specular reflection. Non-specular reflection refers to reflection at an angle different from the angle of incidence, and includes reflection by a metasurface whose reflection characteristics are artificially controlled.
  • the thickness of the conductive pattern of the conductive layer constituting the reflective surface and the thickness of the adhesive layer supporting the conductive pattern are controlled. Specifically, in a configuration in which the conductive pattern is adhered to the dielectric layer with an adhesive layer arranged with a shape or in-plane occupancy rate similar to that of the conductive pattern, the thickness of the adhesive layer is set to be thicker than 50 ⁇ m and less than 1500 ⁇ m. Alternatively, the thickness of the conductive pattern is set to be thicker than 0.1 ⁇ m and less than 10.0 ⁇ m.
  • the shape or in-plane occupancy rate of the adhesive layer and the conductive pattern being "same” does not mean that they match in strict detail, but rather that the shape or in-plane occupancy rate of the adhesive layer and the conductive pattern match within a range of ⁇ 5%, including allowable errors, process variations, etc.
  • ⁇ Configuration of the reflection panel and electromagnetic wave reflection device> 1 is a schematic diagram of an electromagnetic wave reflecting device 60 using a reflecting panel 10.
  • the electromagnetic wave reflecting device 60 includes the reflecting panel 10 and a frame 50 that holds the reflecting panel.
  • the width or horizontal direction of the reflecting panel 10 is the X direction
  • the height or vertical direction is the Y direction
  • the thickness direction is the Z direction.
  • the electromagnetic wave reflecting device 60 may be provided with legs 56 to make the electromagnetic wave reflecting device 60 self-supporting.
  • the electromagnetic wave reflecting device 60 may have a top frame 57 that holds the upper end of the reflecting panel 10 in the height (Y) direction, and a bottom frame 58 that holds the lower end.
  • the reflective panel 10 is a single panel that reflects electromagnetic waves in a predetermined frequency band selected from frequencies between 1 GHz and 300 GHz, for example, between 1 GHz and 170 GHz, in the direction of specular reflection and the direction of non-specular reflection with a certain degree of reflection intensity.
  • a predetermined conductive pattern is supported on a dielectric layer by an adhesive layer, and a reflective surface is formed by the conductive pattern.
  • the conductive pattern is formed of a transparent conductive material or a metal material with good conductivity, into a periodic pattern, mesh pattern, geometric pattern, or the like.
  • the thickness of the conductive pattern is thicker than 0.1 ⁇ m and less than 10.0 ⁇ m.
  • the frame 50 holds both ends of the reflective panel in the width (X) direction.
  • the frame 50 may be called a side frame due to the positional relationship between the top frame 57 and the bottom frame 58.
  • the frame 50 not only stably holds the reflective panel 10 when the electromagnetic wave reflection device 60 is assembled, but also contributes to the safety of the transportation of the reflective panel 10 and reinforcement of its mechanical strength.
  • the frame 50 has the function and configuration of making the reflective potential between adjacent reflective panels 10 continuous.
  • Figure 2 shows a schematic diagram of the reflection mode of the reflective panel 10.
  • electromagnetic waves EMi are incident on the reflective surface 105 of the reflective panel 10 from a direction perpendicular to the reflective surface 105.
  • the angle of incidence of perpendicular incidence is 0 degrees.
  • the reflective panel 10 generates at least one of a non-specular reflection component Rnsp that is reflected to the +X side at a reflection angle different from 0°, and a non-specular reflection component -Rnsp that is reflected to the -X side.
  • the specular reflection component Rsp and the non-specular reflection component Rnsp or -Rnsp both have a reflection gain higher than -10 dB, and the difference in gain is within 8 dB, preferably within 5 dB.
  • the thickness of the conductive pattern that forms the reflective surface 105 and the adhesive layer that the conductive pattern supports are controlled.
  • ⁇ Layer structure of reflective panel> 3 shows the layer structure of the reflective panel 10A.
  • This layer structure is the layer structure in the thickness (Z) direction of the reflective panel 10A.
  • the reflective panel 10A has a dielectric layer 14, a conductive pattern 151 provided on one surface 141 of the dielectric layer 14, a ground layer 13 provided on the other surface 142 of the dielectric layer 14, and an adhesive layer 153 that bonds the conductive pattern 151 to the dielectric layer 14.
  • the adhesive layer 153 is provided on the surface 141 of the dielectric layer 14 with the same area occupancy as the conductive pattern 151.
  • the dielectric layer 14 is an insulating polymer film such as polycarbonate, cycloolefin polymer (COP), polyethylene terephthalate (PET), or fluororesin, and has a thickness of about 0.3 mm to 1.0 mm.
  • the thickness, dielectric constant, and dielectric dissipation factor of the dielectric layer 14 greatly affect the reflective characteristics of the reflective panel 10.
  • the thickness of the adhesive layer 153 and the conductive pattern 151 are controlled to achieve reflection in multiple directions, so the dielectric layer 14 may be made of a material that has a dielectric constant and dielectric dissipation factor that do not inhibit the expression of the target reflective characteristics.
  • an insulating polymer film with a dielectric constant of 3.0 or less and a dielectric dissipation factor of 0.1 or less is used.
  • the conductive pattern 151 is a periodic pattern formed of a good conductor such as Cu, Ni, or Ag, and has a thickness greater than 0.1 ⁇ m and less than 10.0 ⁇ m.
  • the conductive pattern 151 forms the reflective surface 105 (see FIG. 2) of the reflective panel 10.
  • the ground layer 13 may be formed of the same material as the conductive patterns 151, or may be formed of a different conductive material. A capacitance is formed between the ground layer 13 and each conductive pattern 151, and the magnitude of the phase delay is controlled for each conductive pattern 151.
  • the adhesive layer 153 bonds the conductive pattern 151 to the dielectric layer 14 and is formed to a thickness that allows the reflective characteristics of the reflective panel 10 to be controlled. Specifically, the thickness of the adhesive layer 153 is greater than 50 ⁇ m and less than 1500 ⁇ m.
  • the adhesive layer 153 may be made of a resin such as vinyl acetate resin, acrylic resin, cellulose resin, aniline resin, ethylene resin, silicone resin, or other resin.
  • FIG. 4 shows the layer structure of the reflective panel 10B.
  • the reflective panel 10B has an intermediate layer 16 that covers the conductive pattern 151 and the adhesive layer 153, and a dielectric substrate 17 that is joined to the conductive pattern 151 side by the intermediate layer 16.
  • the reflective panel 10B may further have an intermediate layer 12 that covers the ground layer 13, and a dielectric substrate 11 that is joined to the ground layer 13 side by the intermediate layer 12.
  • the intermediate layer 16 protects the surface of the conductive pattern 151 and adheres and holds the dielectric substrate 17. It is desirable for the intermediate layer 16 to be durable and moisture resistant, and for example, ethylene-vinyl acetate (EVA) copolymer or cycloolefin polymer (COP) can be used.
  • EVA ethylene-vinyl acetate
  • COP cycloolefin polymer
  • the thickness of the intermediate layer 16 is 10 ⁇ m to 400 ⁇ m.
  • the dielectric substrate 17 is preferably formed as the outermost layer of the reflective panel 10B from a material with excellent impact resistance, durability, and transparency.
  • a dielectric sheet that is provided as the outermost layer of the reflective panel 10B for protection and durability and has a thickness equal to or greater than that of the dielectric layer 14 is called a "dielectric substrate" to distinguish it from the dielectric layer 14 that carries the conductive pattern 151.
  • Polycarbonate, acrylic resin, PET, etc. can be used as the dielectric substrate 17.
  • the thickness of the dielectric substrate 17 is, for example, 1.0 mm or more and 10.0 mm or less.
  • the intermediate layer 12 protects the surface of the ground layer 13 and adheres and holds the dielectric substrate 11. It is desirable for the intermediate layer 12 to be durable and moisture resistant, and for example, ethylene-vinyl acetate (EVA) copolymer or cycloolefin polymer (COP) can be used.
  • EVA ethylene-vinyl acetate
  • COP cycloolefin polymer
  • the thickness of the intermediate layer 12 is 10 ⁇ m to 400 ⁇ m.
  • the dielectric substrate 11 is preferably formed as the outermost layer of the reflective panel 10B from a material that is excellent in impact resistance, durability, and transparency. Polycarbonate, acrylic resin, PET, etc. can be used as the dielectric substrate 11.
  • the thickness of the dielectric substrate 11 is, for example, 1.0 mm or more and 10.0 mm or less.
  • the conductive pattern 151 By covering the conductive pattern 151 with the intermediate layer 16 and bonding the dielectric substrate 17, the intrusion of moisture and air into the surface of the conductive pattern 151 is suppressed, and deterioration of the reflective surface is suppressed.
  • the ground layer 13 By covering the ground layer 13 with the intermediate layer 12 and bonding the dielectric substrate 11, the intrusion of moisture and air into the surface of the ground layer 13 is suppressed, and surface deterioration of the ground layer 13 is suppressed. This maintains the capacitance between the ground layer 13 and the conductive pattern 151 at a constant value, and the designed magnitude of phase delay can be maintained.
  • the thickness of the conductive pattern 151 or the thickness of the adhesive layer 153 supporting the conductive pattern 151 is designed to be within an appropriate range.
  • the model 21 for evaluation includes a periodic arrangement of unit cells (also called "supercells") 210.
  • the unit cells 210 are arranged in six rows in the X direction and 36 rows in the Y direction.
  • FIG. 6 is a schematic diagram showing the configuration of the unit cell 210 of the model 21.
  • the unit cell 210 is formed of six metal patches 211, 212, 213, 214, 215, and 216.
  • the width (W) direction and length (L) of the metal patches 211-216 correspond to the width (X) direction and height (Y) direction of the reflective panel 10 in FIG. 1, respectively.
  • the metal patches 211-216 have the same width W and different lengths L, but the central axes of the lengths are aligned (the Y coordinate position of the central axis is constant).
  • the pitch in the X direction is constant.
  • the shape and size of the metal patches 211-216 control the phase of reflection, and a reflected beam is formed in the desired direction by superimposing the reflected waves.
  • the unit cell 210 is designed to reflect electromagnetic waves that are perpendicularly incident (incident angle 0°) in a direction 50° from the normal.
  • Metal patches 211, 212, 213, 214, 215, and 216 that form unit cell 210 correspond to conductive pattern 151 in Figures 3 and 4, and are each supported by adhesive layer 153.
  • the thickness of adhesive layer 153 or the thickness of conductive pattern 151 is changed to evaluate the reflection characteristics.
  • the conductive pattern 151 of model 21 in Figure 5 is used, and a plane wave of 28.0 GHz is incident at an incident angle of 0° using general-purpose three-dimensional electromagnetic field simulation software, and the scattering cross section of the reflected wave is analyzed.
  • the scattering cross section, or radar cross section (RCS) is used as an index of the ability to reflect incident electromagnetic waves.
  • Figure 7 shows the analysis space 101 for the electromagnetic field simulation.
  • the thickness direction of the layer structure of the reflective panel 10 is the Z direction
  • the width direction of the metal patch of the model 21 in Figure 5 is the X direction
  • the length direction is the Y direction
  • the analysis space is expressed as (size in the X direction) x (size in the Y direction) x (size in the Z direction).
  • the size of the analysis space 101 when the frequency of the incident electromagnetic wave is 28.0 GHz is 83.9 mm x 192.6 mm x 3.7 mm.
  • the boundary condition is a design in which electromagnetic wave absorbers 102 are placed around the periphery of the analysis space 101.
  • the layer structure in Figure 4 is used as the layer structure for evaluation.
  • Example 1 Focus on the thickness of the adhesive layer.
  • a polycarbonate film with a thickness of 0.7 mm is used as the dielectric layer 14.
  • a ground layer 13 is set on one side of the polycarbonate film with a thickness of 0.36 mm using an Ag-based multilayer film.
  • a conductive pattern 151 formed of copper foil with a thickness of 0.03 mm is placed on the other side of the polycarbonate film.
  • the conductive pattern 151 is supported by an adhesive layer 153 with a thickness of 550 ⁇ m and the same area occupancy rate as the conductive pattern 151.
  • the adhesive layer 153 is a commercially available general adhesive with a relative dielectric constant of 2.4 and a dielectric loss tangent of 0.05.
  • Each of the ground layer 13 and the conductive pattern 151 is covered with a layer of ethylene vinyl acetate with a thickness of 400 ⁇ m and sandwiched between two polycarbonate sheets with a thickness of 2.0 mm.
  • the polycarbonate sheets are used as the outermost dielectric substrates 11 and 17.
  • the RCS plot of a 28.0 GHz plane wave incident at an angle of incidence of 0° has a gain of -5.0616 dB at 0°, a gain of -2.9028 dB at +50°, and a gain of -14.6348 dB at -50°.
  • a gain higher than -6 dB is obtained in the 0° direction of specular reflection and the designed +50° direction, and the difference in gain in these two directions is within 3 dB.
  • Example 2 is Example 2. The conditions are the same as those of Example 1, except for the thickness of the adhesive layer.
  • a conductive pattern 151 formed of a copper foil with a thickness of 0.03 mm is supported by an adhesive layer 153 with a thickness of 750 ⁇ m and the same area occupancy as the conductive pattern 151.
  • the RCS plot of a 28.0 GHz plane wave incident at an incident angle of 0° has a gain of ⁇ 1.6845 dB at 0°, a gain of ⁇ 5.5111 dB at +50°, and a gain of ⁇ 12.9738 dB at ⁇ 50°.
  • a gain higher than -6 dB is obtained in the 0° direction of specular reflection and the designed +50° direction, and the difference in gain between these two directions is within 4 dB.
  • Example 3 is Example 3. The conditions are the same as those of Example 1, except for the thickness of the adhesive layer.
  • a conductive pattern 151 formed of a copper foil with a thickness of 0.03 mm is supported by an adhesive layer 153 with a thickness of 1000 ⁇ m and the same area occupancy as the conductive pattern 151.
  • the RCS plot of a 28.0 GHz plane wave incident at an incident angle of 0° has a gain of ⁇ 0.1677 dB at 0°, a gain of ⁇ 8.1477 dB at +50°, and a gain of ⁇ 14.1064 dB at ⁇ 50°.
  • a gain higher than -10 dB is obtained in the 0° direction of specular reflection and the designed +50° direction, and the difference in gain between these two directions is within 8 dB.
  • the thickness of the adhesive layer 153 carrying the conductive pattern 151 is 1000 ⁇ m, electromagnetic waves can be reflected in two directions: the direction of specular reflection and the designed direction.
  • Example 4 is Example 4. The conditions are the same as those of Example 1, except for the thickness of the adhesive layer.
  • a conductive pattern 151 formed of a copper foil with a thickness of 0.03 mm is supported by an adhesive layer 153 with a thickness of 250 ⁇ m and the same area occupancy as the conductive pattern 151.
  • the RCS plot of a 28.0 GHz plane wave incident at an incident angle of 0° has a gain of ⁇ 6.6782 dB at 0°, a gain of ⁇ 1.6853 dB at +50°, and a gain of ⁇ 16.9408 dB at ⁇ 50°.
  • a gain higher than -10 dB is obtained in the 0° direction of specular reflection and the designed +50° direction, and the difference in gain between these two directions is within 8 dB.
  • the thickness of the adhesive layer 153 carrying the conductive pattern 151 is 250 ⁇ m, electromagnetic waves can be reflected in two directions: the direction of specular reflection and the designed direction.
  • Example 5 is a fifth embodiment. Focus on the thickness of the conductive pattern 151.
  • a polycarbonate film with a thickness of 0.7 mm is used as the dielectric layer 14.
  • a ground layer 13 is set on one side of the polycarbonate film with a thickness of 0.36 mm using an Ag-based multilayer film.
  • a conductive pattern 151 formed of a copper foil with a thickness of 0.001 mm (1.0 ⁇ m) is placed on the other side of the polycarbonate film.
  • the conductive pattern 151 is supported by an adhesive layer 153 with a thickness of 1000 ⁇ m and the same area occupancy rate as the conductive pattern 151.
  • Each of the ground layer 13 and the conductive pattern 151 is covered with a layer of ethylene vinyl acetate with a thickness of 400 ⁇ m and sandwiched between two polycarbonate sheets with a thickness of 2.0 mm.
  • the RCS plot of a 28.0 GHz plane wave incident at an angle of incidence of 0° has a gain of ⁇ 9.0667 dB at 0°, a gain of ⁇ 0.9954 dB at +50°, and a gain of ⁇ 17.8861 dB at ⁇ 50°.
  • a gain higher than -10 dB is obtained in the 0° direction of specular reflection and the designed +50° direction, and the difference in gain between these two directions is approximately 8 dB.
  • the thickness of the conductive pattern 151 is 0.001 mm (1.0 ⁇ m)
  • electromagnetic waves can be reflected in two directions: the direction of specular reflection and the designed direction.
  • Example 6 is Example 6. The conditions are the same as those of Example 5, except for the thickness of the conductive pattern 151.
  • a ground layer 13 is set on one side of a 0.7 mm thick polycarbonate film as the dielectric layer 14, using an Ag-based multilayer film having a thickness of 0.36 mm.
  • a conductive pattern 151 made of copper foil having a thickness of 0.005 mm (5.0 ⁇ m) is disposed on the other side of the polycarbonate film.
  • the RCS plot of a 28.0 GHz plane wave incident at an incident angle of 0° has a gain of ⁇ 2.8762 dB at 0°, a gain of ⁇ 3.2452 dB at +50°, and a gain of ⁇ 16.7852 dB at ⁇ 50°.
  • a gain higher than -10 dB is obtained in the 0° direction of specular reflection and the designed +50° direction, and the difference in gain between these two directions is small at approximately 0.37 dB, so that the light is reflected in two directions with approximately the same strength.
  • the thickness of the conductive pattern 151 is 0.005 mm (5.0 ⁇ m)
  • electromagnetic waves can be effectively reflected in two directions, the direction of specular reflection and the designed direction.
  • Example 7 is Comparative Example 1.
  • the thickness of the adhesive layer 153 carrying the conductive pattern 151 having a thickness of 0.03 mm is set to 50 ⁇ m.
  • the other configurations are the same as those of Example 1.
  • the gain at 0° is ⁇ 16.3973 dB
  • the gain at +50° is ⁇ 1.5362 dB
  • the gain at ⁇ 50° is ⁇ 17.5759 dB.
  • the thickness of the adhesive layer 153 carrying the conductive pattern 151 is reduced to 50 ⁇ m, the perpendicularly incident electromagnetic wave will be reflected only in the designed 50° direction, and no gain exceeding -10 dB will be obtained in the 0° direction of specular reflection. It is desirable to make the adhesive layer 153 thicker than 50 ⁇ m.
  • Example 8 is Comparative Example 2.
  • the thickness of adhesive layer 153 carrying conductive pattern 151 with a thickness of 0.03 mm is set to 1500 ⁇ m.
  • the other configurations are the same as those of Example 1.
  • the gain at 0° is ⁇ 0.9954 dB
  • the gain at +50° is ⁇ 14.0880 dB
  • the gain at ⁇ 50° is ⁇ 17.8861 dB.
  • the thickness of the adhesive layer 153 supporting the conductive pattern 151 is increased to 1500 ⁇ m, the perpendicularly incident electromagnetic waves will be reflected only in the 0° direction, which is the direction of specular reflection, and no gain exceeding -10 dB will be obtained in the designed direction. It is desirable to keep the thickness of the adhesive layer 153 less than 1500 ⁇ m.
  • Example 9 is Comparative Example 3.
  • the conductive pattern 151 formed of a copper foil having a thickness of 0.01 mm (10.0 ⁇ m) is supported by an adhesive layer 153 having a thickness of 1000 ⁇ m and the same area occupancy as the conductive pattern 151.
  • the other conditions are the same as those of Example 1.
  • the gain at 0° is ⁇ 0.8865 dB
  • the gain at +50° is ⁇ 15.1212 dB
  • the gain at ⁇ 50° is ⁇ 14.134 dB.
  • the thickness of the conductive pattern 151 is 0.01 mm, electromagnetic waves that are perpendicularly incident will be reflected only in the direction of 0°, which is the direction of specular reflection, and no gain exceeding -10 dB will be obtained in the designed direction. It is desirable for the thickness of the conductive pattern 151 to be less than 0.01 mm (10.0 ⁇ m).
  • Example 10 is Comparative Example 4.
  • the thickness of the conductive pattern 151 is reduced.
  • the conductive pattern 151 formed of a copper foil having a thickness of 0.0001 mm (0.1 ⁇ m) is supported by an adhesive layer 153 having a thickness of 1000 ⁇ m and the same area occupancy as the conductive pattern 151.
  • the other conditions are the same as those of Example 1.
  • the gain at 0° is ⁇ 0.8865 dB
  • the gain at +50° is ⁇ 15.1212 dB
  • the gain at ⁇ 50° is ⁇ 14.134 dB.
  • the thickness of the conductive pattern 151 is reduced to 0.0001 mm, the perpendicularly incident electromagnetic wave will be reflected only in the 0° direction, which is the direction of specular reflection, and no gain exceeding -10 dB will be obtained in the designed direction. It is desirable for the thickness of the conductive pattern 151 to be thicker than 0.0001 mm (0.1 ⁇ m).
  • the thickness of the adhesive layer 153 that supports the conductive pattern 151 at the same occupancy rate as the conductive pattern 151 is preferably thicker than 50 ⁇ m and less than 1500 ⁇ m, more preferably 250 ⁇ m to 1000 ⁇ m, and even more preferably 250 ⁇ m to 750 ⁇ m.
  • the thickness of the adhesive layer 153 is preferably thicker than 0.1 ⁇ m and less than 10.0 ⁇ m. By setting the thickness of the conductive pattern 151 within this range, the incident electromagnetic wave can be reflected in two directions, the direction of specular reflection and the designed direction, while maintaining a certain degree of reflection intensity.
  • the reflection panel and the electromagnetic wave reflection device of the embodiment are not limited to the above-mentioned configuration examples.
  • the results of Examples 1 to 9 are applicable to electromagnetic waves of 28 GHz ⁇ 5 GHz.
  • the in-plane size of the reflection panel 10 can be appropriately selected within a range of 10.0 cm x 10.0 cm to 3.0 m x 3.0 m. It has been confirmed by calculation that the results close to those of Examples 1 to 6 can be obtained if the adhesive layer 153 that adheres the conductive pattern 151 to the dielectric layer 14 is at least partially separated or removed without covering the entire surface of the dielectric layer 14.
  • the reflection panel 10 reflects the incident electromagnetic wave in the direction of specular reflection and the designed direction while maintaining a certain degree of reflection intensity, so that even a small reflection panel can effectively improve the radio wave environment. As shown in FIG. 8, multiple reflection panels 10 may be connected and used.
  • ⁇ Electromagnetic wave reflective fence> 8 is a schematic diagram of an electromagnetic wave reflecting fence 100 in which a plurality of reflecting panels 10-1, 10-2, and 10-3 are connected by a frame 50.
  • the reflecting panels 10-1, 10-2, and 10-3 and the frame 50 that holds the side edges of these reflecting panels form electromagnetic wave reflecting devices 60-1, 60-2, and 60-3, respectively.
  • Each of the reflecting panels 10-1, 10-2, and 10-3 reflects an incident electromagnetic wave in a specular reflection direction and at least one non-specular reflection direction while maintaining a certain degree of reflection intensity.
  • the reflective panels 10-1, 10-2, and 10-3 may be electrically connected to each other by a frame 50 in order to maintain the continuity of the reflected potential.
  • the adjacent reflective panels 10 can be mechanically and electrically connected.
  • the electromagnetic wave reflective fence 100 may be made to stand on its own using legs 56, or may be installed on a wall or ceiling without legs 56. In this case, incident electromagnetic waves can be reflected in two or more directions while maintaining a certain level of reflection strength.
  • a reflective panel that reflects radio waves in a predetermined band selected from a frequency band of 1 GHz or more and 300 GHz or less, A dielectric layer; a periodic conductive pattern provided on one surface of the dielectric layer; a ground layer provided on the other surface of the dielectric layer; an adhesive layer that bonds the conductive pattern to the one surface; The adhesive layer that adheres the conductive pattern is provided with the same area occupancy as the conductive pattern, and the thickness of the conductive pattern is greater than 0.1 ⁇ m and less than 10.0 ⁇ m.
  • Reflective panel (Item 2) an intermediate layer covering the adhesive layer and the conductive pattern; Item 2.
  • the reflective panel according to item 1 further comprising: (Item 3) a dielectric substrate bonded onto the conductive pattern by the intermediate layer; 3.
  • a reflective panel that reflects radio waves in a predetermined band selected from a frequency band of 1 GHz or more and 300 GHz or less, A dielectric layer; a periodic conductive pattern provided on one surface of the dielectric layer; a ground layer provided on the other surface of the dielectric layer; an adhesive layer that bonds the conductive pattern to the one surface of the dielectric layer; The adhesive layer that adheres the conductive pattern is provided with the same area occupancy as the conductive pattern, and the thickness of the adhesive layer is greater than 50 ⁇ m and less than 1500 ⁇ m.
  • Reflective panel (Item 6) an intermediate layer covering the adhesive layer and the conductive pattern; Item 6.
  • the reflective panel according to item 5 further comprising: (Item 7) a dielectric substrate bonded onto the conductive pattern by the intermediate layer; Item 7.
  • the conductive pattern forms a reflective surface of the reflective panel, and reflects incident electromagnetic waves in a first direction of specular reflection and in a second direction of non-specular reflection, and the difference between the reflection intensity in the first direction and the reflection intensity in the second direction is within 8 dB.
  • Item 8 The reflective panel according to any one of items 5 to 7.
  • Item 9 Item 9.
  • An electromagnetic wave reflecting device having the same. Item 10.
  • An electromagnetic wave reflective fence comprising a plurality of reflective panels connected together according to item 9.
  • Electromagnetic wave reflecting device 100 Electromagnetic wave reflecting fence 210 Unit cell

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Abstract

L'invention concerne un panneau de réflexion qui réfléchit les ondes électromagnétiques incidentes dans de multiples directions avec un certain degré d'intensité de réflexion, et un dispositif de réflexion d'ondes électromagnétiques l'utilisant. Un panneau de réflexion permettant de réfléchir des ondes radio d'une bande prédéterminée sélectionnée à partir d'une bande de fréquences de 1 à 300 GHz inclus comprend : une couche diélectrique ; un motif conducteur périodique qui est disposé sur une surface de la couche diélectrique ; une couche de masse qui est disposée sur l'autre surface de la couche diélectrique ; et une couche d'adhérence qui relie le motif conducteur à ladite surface. L'épaisseur du motif conducteur est de 0,1 à 10,0 µm exclus. En variante, l'épaisseur de la couche d'adhérence est de 50 à 1500 µm exclus.
PCT/JP2023/042015 2022-12-23 2023-11-22 Panneau de réflexion, dispositif de réflexion d'ondes électromagnétiques et barrière de réflexion d'ondes électromagnétiques WO2024135216A1 (fr)

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JP2022-206475 2022-12-23
JP2022206475 2022-12-23

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WO2024135216A1 true WO2024135216A1 (fr) 2024-06-27

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