WO2022030395A1 - Frequency selection surface loading member and window member for vehicle - Google Patents

Abstract

The present embodiment relates to a frequency selection surface loading member which has a laminated member including a total of n dielectric layers laminated in order from a first layer to an nth layer (n is an integer of 3 or more) and in which a frequency selection surface through which a radio wave having a predetermined frequency F passes is provided on at least one among the main surfaces of the dielectric layers constituting the laminated member, the frequency selection surface has a conductive portion and a non-conductive portion, and the solar transmittance specified in ISO9050:2003 is 54% or less.

Description

Frequency selection surface loading member and vehicle window member

The present invention relates to a frequency selective surface loading member and a vehicle window member.

In recent years, the frequency band of radio waves used for communication has expanded to a high frequency band with the increase in communication speed and communication capacity. For example, in recent 4th generation mobile communication systems (hereinafter referred to as "4G") and 5th generation mobile communication systems (hereinafter referred to as "5G"), radio waves in a frequency band of several hundred MHz to several tens of GHz are used. There is.

In order to perform communication in such a high frequency band, for example, in a vehicle, it has been proposed to mount a radar device in an emblem outside the vehicle or in the front grill. Further, in recent years, by mounting the radar device inside the vehicle, particularly inside the windshield, it becomes possible to efficiently communicate from a position relatively higher than the ground in the vehicle rather than inside the emblem or the front grill.

However, the laminated glass used for the windshield has a problem that the radio wave transmittance decreases due to reflection and absorption when radio waves pass through. In addition, the radio wave transmittance changes depending on the angle of the windshield and the thickness of the glass. Further, a heat ray reflecting film for the purpose of reducing the cooling load is used for the windshield, but in this case, there is a problem that radio waves are shielded by the conductive film contained in the heat ray reflecting film.

The above problem can occur not only in laminated glass of vehicles but also in Low-E double glazing used for window glass of buildings and the like, and the thermal performance is improved with the use of the high frequency band of communication. It is required to improve radio wave transmission while maintaining it.

To solve the above problem, for example, Patent Document 1 proposes a communication window having an enhanced frequency selectivity surface provided with an arc-shaped break line, and the communication window passes through the selected radio frequency without attenuating it. Designed to let you.

Further, Patent Document 2 proposes a dielectric substrate in which a plurality of convex-shaped dielectric portions are periodically arranged on one surface, and improves the transmission characteristics of radar waves incident on the dielectric surface. ing.

International Publication No. 2004/093497 International Publication No. 2019/180926

In the communication window described in Patent Document 1, the radio wave permeability when the radio wave is obliquely incident is not sufficient and there is room for improvement. Further, the dielectric substrate described in Patent Document 2 has a problem that the aesthetic appearance and visibility are poor because a plurality of convex-shaped dielectric portions are arranged.

The present invention provides a frequency selective surface loading member and a vehicle window member capable of improving radio wave transmission without impairing thermal performance and workability.

The frequency selective surface loading member according to the present invention has a laminated member including a total of n dielectric layers laminated in order from the first layer to the nth layer (where n is an integer of 3 or more). At least one of the main surfaces of the dielectric layer constituting the laminated member is provided with a frequency selection surface that transmits radio waves of a predetermined frequency F, and the frequency selection surface has a conductive portion and a non-conductive portion. The solar transmittance specified in ISO 9050: 2003 is 54% or less.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the laminated member has two continuous intermediates as the dielectric layer other than the dielectric layer of the outermost layer of the laminated member, and is continuous. The frequency selection surface may be provided between the two intermediates.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the two continuous intermediates may be made of the same resin material.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the resin material may be PVB or EVA.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the first layer and the nth layer may be glass substrates.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the first layer or the nth layer is a shielding layer that shields visible light, and in a plan view of the laminated member, the frequency selective surface is At least a part thereof may overlap with the shielding layer.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the dielectric layer adjacent to the shielding layer may be a glass substrate.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the distance from the frequency selective surface to the surface of the first layer opposite to the second layer and the nth layer from the frequency selective surface. Of these, the distance to the surface opposite to the n-1th layer may be substantially the same.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the laminated member is composed of four dielectric layers, and the first glass substrate, the first resin layer, and the second resin are in order from the first layer. The layer and the second glass substrate may be laminated.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the laminated member is composed of five dielectric layers, and the first glass substrate, the first resin layer, and the third resin are in order from the first layer. The layer, the second resin layer, and the second glass substrate may be laminated.

Further, in the frequency selection surface loading member according to one aspect of the present invention, the frequency selection surface may be provided on at least one of the two outermost surfaces of the laminated member.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the visible light transmittance specified in ISO 9050: 2003 may be 60% or more.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the solar reflectance specified in ISO 9050: 2003 may be 8% or more.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the visible light reflectance specified in ISO 9050: 2003 may be 15% or less.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the visible light reflection color tone Rva ^* specified in ISO 9050: 2003 may be −10 to 5 and Rvb ^* may be −10 to 10. ..

Further, in the frequency selective surface loading member according to one aspect of the present invention, Ta ^* of the visible light transmission color tone defined in ISO 9050: 2003 may be −8 to 5 and Tb ^* may be −8 to 6. ..

Further, in the frequency selective surface loading member according to one aspect of the present invention, the width G of the non-conductive portion of the frequency selective surface may be 0.01 mm to 0.5 mm.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the sheet resistance of the conductive portion of the frequency selective surface may be 50 Ω / □ or less.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the conductive portion of the frequency selective surface is selected from the group consisting of tin oxide doped with at least one of Ag, ITO, fluorine and antimony, and Cu. At least one may be contained.

Further, in the frequency selective surface loading member according to one aspect of the present invention, when the frequency selective surface loading member is used as a window member, the non-conductive portion of the frequency selective surface is at least horizontal and perpendicular to the ground. It may have one component.

Further, the frequency selection surface loading member according to one aspect of the present invention may have a first region having the frequency selection surface and a second region not having the frequency selection surface in a plan view.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the outer edge of the first region may be inside the outer edge of the second region in a plan view.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the frequency F may be included in the range of 1 GHz to 100 GHz.

The vehicle window member according to the present invention includes the above frequency selection surface loading member.

The vehicle window member according to one aspect of the present invention may be a windshield for a vehicle.

According to the frequency selection surface loading member according to the present invention, radio wave transmission can be improved without impairing thermal performance and workability.

FIG. 1 is a cross-sectional view showing an outline of the structure of the FSS loading member according to the present embodiment. FIG. 2 is an example of an FSS loading member according to the present embodiment in a plan view, and is a diagram showing a first region A having an FSS and a second region B not having an FSS. 3 (A) and 3 (B) are views showing an example of the shape (plan view) of the FSS in the present embodiment. FIG. 3A shows a shape in which the non-conductive portion is formed in a double lattice stripe shape in a plan view. FIG. 3B shows a circular loop slot type in which a plurality of ring-shaped non-conductive portions are formed in a plan view. FIG. 4 is a cross-sectional view of an FSS loaded member according to an embodiment of the present invention. FIG. 5 is a cross-sectional view of an FSS loaded member according to another embodiment of the present invention. FIG. 6 is a cross-sectional view of the FSS loading member of Example 1. FIG. 7 is a cross-sectional view of the FSS loading member of Example 2.

Hereinafter, embodiments of the present invention will be described in detail. Further, in the following drawings, members / parts having the same function may be described with the same reference numerals, and duplicate description may be omitted or simplified. In addition, the embodiments described in the drawings are schematically for the purpose of clearly explaining the present invention, and do not necessarily accurately represent the size or scale of an actual product.

In the present embodiment, the "laminated member" means a laminated body in which a plurality of dielectric layers are laminated, and is configured not to include a frequency selection surface. On the other hand, the "frequency selective surface loading member" is a configuration in which the frequency selective surface is loaded on at least one of the main surfaces of the plurality of dielectric layers constituting the laminated member. As described above, in the present specification, the "laminated member" and the "frequency-selective surface-loaded member" are distinguished by a configuration including a frequency-selective surface and a configuration not including the frequency-selective surface.

The frequency selection surface loading member (hereinafter, also referred to as FSS loading member) according to the present embodiment has a laminated member including a total of n dielectric layers laminated in order from the first layer to the nth layer (however, n). Is an integer greater than or equal to 3). Further, a frequency selection surface (Frequency Selective Surface; hereinafter also referred to as FSS) that transmits radio waves of a predetermined frequency F is provided on at least one of the main surfaces of the plurality of dielectric layers constituting the laminated member. The FSS has a conductive portion and a non-conductive portion, and is characterized in that the solar transmittance specified in ISO 9050: 2003 is 54% or less.

As described above, in the FSS loading member according to the present embodiment, the laminated member provided with a plurality of dielectric layers is loaded with FSS that transmits radio waves of a predetermined frequency F, and the solar transmittance is suppressed to a low level, thereby causing heat. Radio wave transmission can be improved without impairing the performance.

FIG. 1 is a cross-sectional view showing the structure of the FSS loading member according to the present embodiment. As shown in FIG. 1, the FSS loading member 10 has a laminated member including a total of n dielectric layers laminated in order from the first layer to the nth layer. In other words, the laminated member has a dielectric layer located on the outermost surface side of the first layer as the first layer, and of the two main surfaces of the first layer, the main surface opposite to the outermost surface of the laminated member. The second layer to the nth layer are laminated in order on the side. Further, the laminated member in the FSS loading member 10 is composed of three or more dielectric layers. That is, n is an integer of 3 or more.

In the FSS loading member according to the present embodiment, at least one of the main surfaces of the plurality of dielectric layers constituting the laminated member is provided with an FSS that transmits radio waves of a predetermined frequency F. Such an FSS has a function of selectively transmitting a radio wave having a preset frequency F and suppressing radio wave transmission of a frequency other than the frequency band. The FSS loading member according to the present embodiment can improve the radio wave transmission by providing the FSS that transmits the radio wave of the predetermined frequency F at the predetermined position.

Here, "in the FSS loading member according to the present embodiment, the FSS is provided on at least one of the main surfaces of the plurality of dielectric layers constituting the laminated member" means that all the dielectrics constituting the laminated member are provided. It means that the FSS is provided on at least one main surface of the main surface of the layer.

For example, when the laminated member includes a total of three dielectric layers (n = 3), the main surface of the laminated member is between the outermost surface on the first layer side and between the first layer and the second layer. There are a total of four main surfaces, the main surface between the second layer and the third layer, and the outermost surface on the third layer side. When the main surfaces overlap each other, the number of main surfaces is counted as one. Therefore, in this case, the FSS loading member is provided with the FSS on at least one of these four main surfaces included in the laminated member.

The FSS loading member according to this embodiment has a solar transmittance of 54% or less specified in ISO 9050: 2003. As a result, a good heat shielding effect is obtained and the thermal characteristics are excellent. The solar transmittance of the FSS loaded member according to the present embodiment is preferably 54% or less, more preferably 50% or less, further preferably 45% or less, particularly preferably 41% or less, and most preferably 38% or less.

The reason why the solar transmittance of the FSS loading member according to the present embodiment is suppressed to a low level as described above is that the conductive portion forming the FSS has a solar radiation reflection function. The solar reflection function is proportional to the area of the conductive portion. If the FSS is not properly designed, a wide part of the conductive portion must be removed as a radio wave transmitting member, and it is not possible to achieve both solar reflectivity and radio wave transmission. However, by appropriately designing the FSS, it is possible to improve the radio wave transmission while maintaining a high residual ratio of the conductive portion, and it is possible to achieve both solar reflectivity and radio wave transmission.

Further, the FSS loading member according to the present embodiment preferably has a visible light transmittance of 60% or more specified in ISO 9050: 2003. As a result, the visibility of the FSS loading member is excellent. Further, the visible light transmittance of the FSS loaded member according to the present embodiment is preferably 65% or more, more preferably 70% or more.

The visible light transmittance of the FSS loading member according to the present embodiment can be increased as described above because a transparent conductive film such as Ag or ITO is used for the conductive portion constituting the FSS.

Further, the solar reflectance specified in ISO 9050: 2003 of the FSS loading member according to the present embodiment is preferably 8% or more, more preferably 12% or more. When the solar reflectance is in the above range, a good heat shielding effect can be obtained and the thermal characteristics are excellent.

Further, the visible light reflectance specified in ISO 9050: 2003 of the FSS loading member according to the present embodiment is preferably 15% or less, more preferably 10% or less. When the visible light reflectance is within the above range, the visibility of the FSS loaded member is excellent.

The visible light reflection color tone Rva ^* specified in ISO 9050: 2003 of the FSS loading member according to the present embodiment is preferably -10 to 5, and Rvb ^* is preferably -10 to 10. When Rva ^* and Rvb ^* are in the above range, the color difference from the non-conductive portion becomes small and the FSS pattern becomes difficult to see, so that the aesthetic appearance of the FSS loading member is excellent.

Further, the Ta ^* of the visible light transmission color tone specified in ISO 9050: 2003 of the FSS loading member according to the present embodiment is preferably −8 to 5, and the Tb ^* is preferably −8 to 6. When Ta ^* and Tb ^* are in the above range, the color difference from the non-conductive portion becomes small and the FSS pattern is difficult to see, so that the aesthetic appearance of the FSS loading member is excellent.

The FSS loading member 10 in the present embodiment may be provided so that the outer edge of the FSS is located inside the outer edge of the FSS loading member 10 in a plan view. That is, the FSS loading member 10 may be provided with a specific region for improving the transparency of radio waves having a frequency F.

Note that the plan view corresponds to the case where the FSS loading member 10 is viewed from the normal direction of the main surface. For example, FIG. 2 illustrates a case where the FSS loading member 10 is a window member for a vehicle, but the FSS loading member 10 according to the present embodiment does not include a first region A having an FSS and an FSS in a plan view. It may have a second region B.

The FSS loading member 10 shown in FIG. 2 shows a case where the outer edge of the first region A is inside the outer edge of the second region B. However, in the plan view of the FSS loading member 10, the outer edge of the first region A is shown. A part of the second region B may share or overlap a part of the outer edge of the second region B.

Alternatively, the FSS loading member according to the present embodiment may be provided so that the outer edge of the FSS substantially coincides with the outer edge of the laminated member in a plan view. That is, in the FSS loading member according to the present embodiment, the size of the FSS and the other dielectric layer may be substantially the same.

Further, when the FSS loading member 10 according to the present embodiment is a windshield of the vehicle, the first region A is the driver's view in a plan view, for example, near the upper center (FIG. 2) or the lower part of the FSS loading member. May be provided at a position that does not block.

Here, when the vertical length of the windshield of the vehicle is "D", for example, the "upper part" can exemplify a region from the upper side of the windshield to a distance of 0.3 × D or less from the upper side to the lower side. The “lower part” can be exemplified as an area from the lower side of the windshield to an upper side up to a distance of 0.3 × D or less.

Further, the "upper part" may be an area up to a distance of 0.2 × D or less from the upper side of the windshield, and the “lower part” may be an area up to a distance of 0.2 × D or less from the lower side of the windshield.

Further, when the FSS loading member 10 according to the present embodiment is a windshield for a vehicle, the FSS loading member 10 is provided not only in a part of the windshield but also on the entire surface as long as the driver's field of vision can be sufficiently maintained. May be good. At least, the FSS loading member may be provided in a region where radio waves of a predetermined frequency F can be transmitted and received.

When the FSS loading member 10 according to the present embodiment is used as a vehicle window member, it is not limited to the windshield, but is not limited to the windshield, but is made of resin such as rear glass, side glass, rear quarter glass, roof glass, resin door, resin roof, and rear spoiler. It may be used for parts.

Hereinafter, each member of the FSS loading member according to the present embodiment will be described in more detail.

<Dielectric layer>
The dielectric layer is a substance in which dielectric property is superior to conductivity, and the dielectric layer has a property of being electrically polarized when an external electric field is applied. The type of the dielectric layer included in the FSS loading member is not particularly limited, and for example, a dielectric substrate such as a glass substrate and a resin substrate, an intermediate provided between the dielectric substrates, a coating layer, and a dielectric substrate surface (FSS loading). Examples include a coating layer provided on the outermost surface side of the member), air, and the like. When the dielectric layer is air, the air is limited to any of the second layer to the n-1 layer, and can be used as a dielectric layer between dielectric substrates, particularly a dielectric layer between glass substrates.

As the glass substrate, for example, soda lime glass, non-alkali glass, borosilicate glass, quartz glass and the like can be used. A tempered glass substrate that has been physically or chemically strengthened may be used as the glass substrate. The glass substrate is preferably float glass produced by the float method. The glass substrate may be glass manufactured by the fusion method.

Examples of the resin substrate include an acrylic resin such as polymethylmethacrylate, an aromatic polycarbonate resin such as polyphenylene carbonate, and an aromatic polyester resin such as polyethylene terephthalate (PET).

As an intermediate provided between the dielectric substrates, for example, between the glass substrates, a resin layer containing a resin material such as polyvinyl butyral (PVB), ethylene vinyl acetal (EVA), and polyethylene terephthalate (PET) can be used.

Further, as the intermediate, a thermosetting resin which is liquid before heating may be used. That is, the intermediate may be layered when it is made into a laminated member, and the intermediate may be liquid as long as it is in a state before joining such as a dielectric substrate.

Further, the intermediate may be air (vacuum) as exemplified above, or may contain at least one selected from PVB, EVA or air. Then, the non-conductive portion of the FSS may contain at least one selected from PVB, EVA or air.

In the FSS loading member according to the present embodiment, the intermediate may have a plurality of layers. In the present specification, when there are intermediates having a total of m layers, they are referred to as first intermediates, second intermediates, ..., Mth intermediates. However, m is an integer of 1 or more and n-2 or less.

Examples of the coating layer include functional coating layers having various functions, such as a light shielding layer such as a black ceramic layer, a coating layer imparting a water repellent function, a hydrophilic function, an antifog function, and the like, and a heat ray reflecting layer. Can be mentioned. Examples of these coating layers include a layer having a thickness thinner than that of a dielectric substrate and a layer made of a material having a lower rigidity than that of a dielectric substrate. The coating layer is often arranged, for example, to coat the main surface of a dielectric substrate made of a glass substrate having a predetermined thickness and high rigidity.

The coating layer can be formed by using a physical vapor deposition method such as a sputtering method, a vacuum vapor deposition method, or an ion plating method. Further, the coating layer may be formed by using a chemical vapor deposition method or a wet coating method.

In the FSS loading member according to the present embodiment, a dielectric substrate is usually used for the dielectric layer (at least one of the first layer and the nth layer) on the outermost layer side. In particular, when the FSS loading member according to the present embodiment is used as a laminated glass for a vehicle, it is preferable to use a glass substrate for the first layer and the nth layer.

However, when the FSS loading member according to the present embodiment is provided with a coating layer such as a black ceramic layer as the first layer or the nth layer on the second layer or the n-1 layer, it becomes a coating layer. There is. The coating layer such as the black ceramic layer is a layer that shields visible light and is also called a shielding layer.

When the shielding layer is used as the outermost layer of the dielectric layer of the FSS loading member in this way, the design can be improved especially when it is used as a laminated glass for vehicles. Further, it is preferable that the FSS loading member is a laminated glass for a vehicle and the FSS overlaps with at least a part of the shielding layer in a plan view, so that the FSS is less likely to be visually recognized, and it is more preferable that the FSS overlaps with the entire shielding layer. ..

When the outermost layer (first layer or nth layer) of the dielectric layer is a shielding layer, the dielectric layer (second layer or n-1 layer) adjacent to the shielding layer is preferably a glass substrate. Further, the intermediate is used for any of layers other than the dielectric layer on the outermost layer side (other than the first layer and the nth layer), that is, the second layer to the n-1th layer.

The shape of the dielectric layer is not particularly limited, and may be a planar shape or a curved surface whose main surface has a finite radius of curvature and is curved.

The relative permittivity of the dielectric layer is preferably 1 or more, more preferably 2.3 or more. The relative permittivity of the dielectric layer is preferably 7.2 or less, more preferably 7.0 or less, and even more preferably 6.8 or less. The relative permittivity of the dielectric layer is in a test environment where the temperature is kept within the range of 23 ° C ± 2 ° C and the relative humidity is kept within the range of 50% ± 5% RH according to the transformer bridge method based on ASTM D150. , It is a value obtained at 1 MHz using a dielectric breakdown test device.

The relative permittivity of the first layer and the nth layer of the dielectric layer is preferably 2.3 or more. The relative permittivity of the first layer and the nth layer of the dielectric layer is preferably 7.2 or less, more preferably 7.0 or less, and even more preferably 6.8 or less.

In particular, at least one of the dielectric layers of the first layer to the nth layer of the FSS loading member according to the present embodiment preferably has a relative permittivity close to the relative permittivity of the adjacent dielectric layer. As a result, reflection at the interface between the dielectric layer and the dielectric layer can be reduced, so that radio wave transmission is improved.

As the dielectric layer in the FSS loading member, a glass substrate may be used for at least one layer. The composition of the glass substrate is not particularly limited, but for example, when soda lime glass is used as the glass substrate, the molar percentage of each component is displayed based on the oxide.
50% ≤ SiO ₂ ≤ 80%
0.1% ≤ Al ₂ O ₃ ≤ 25%
3% ≤ R ₂ O ≤ 30% (R ₂ O represents the total amount of Li ₂ O, Na ₂ O, K ₂ O)
0% ≤ B ₂ O ₃ ≤ 10%
0% ≤ MgO ≤ 25%
0% ≤ CaO ≤ 25%
0% ≤ SrO ≤ 5%
0% ≤ BaO ≤ 5%
0% ≤ ZrO ₂ ≤ 5%
0% ≤ SnO ₂ ≤ 5%
There are things that satisfy.

Further, when non-alkali glass is used as the glass substrate used for the FSS loading member, the content of each component in terms of molar percentage display based on the oxide is determined.
50% ≤ SiO ₂ ≤ 80%
0% ≤ Al ₂ O ₃ ≤ 30%
0% ≤ B ₂ O ₃ ≤ 25%
0% ≤ MgO ≤ 25%
0% ≤ CaO ≤ 25%
0% ≤ SrO ≤ 25%
0% ≤ BaO ≤ 25%
0% ≤ ZrO ₂ ≤ 5%
5% ≤ RO ≤ 40% (RO represents the total amount of MgO, CaO, SrO, BaO)
There are things that satisfy.

Further, as the glass substrate, borosilicate glass, which is an oxide-based glass containing silicon dioxide as a main component and a boron component as a main component, may be used. The boron component in the borosilicate glass is boron oxide (a general term for boron oxides such as diboron trioxide (B ₂ O ₃ )), and the ratio of boron oxide in the glass is expressed in terms of B ₂ O ₃ . Similarly, the main components in the glass are represented by oxides such as SiO ₂ , Al ₂ O ₃ , B ₂ O ₃ , MgO, CaO, SrO, BaO, LiO ₂ , Na ₂ O, K ₂ O, and the like. The ratio is expressed on an oxide basis.

In the present embodiment, the borosilicate glass refers to an oxide-based glass containing silicon dioxide as a main component _, which contains 1.0% or _more of B2O3 in terms of molar percentage display based on oxides.

The specific gravity of the glass substrate is preferably 2.4 or more and 3.0 or less. The Young's modulus of the glass substrate is preferably 60 GPa or more and 100 GPa or less.

The average coefficient of thermal expansion of the glass substrate from 50 ° C to 350 ° C is preferably 50 × 10 ^-7 / ° C or higher. The average coefficient of thermal expansion of the glass substrate from 50 ° C. to 350 ° C. is preferably 120 × 10 ^-7 / ° C. or less. If the glass substrate satisfies these physical characteristics requirements, it can be sufficiently suitably used as, for example, a window material.

<Frequency selection surface>
The frequency selection surface (FSS) has a conductive portion and a non-conductive portion in a plan view, transmits radio waves of a predetermined frequency F, and suppresses transmission of radio waves of frequencies other than the frequency band.

Here, the conductive portion in the FSS means a portion of the FSS having a sheet resistance of 50 Ω / □ or less at 20 ° C. The non-conductive portion in FSS means a portion where the sheet resistance at 20 ° C. exceeds 50 Ω / □.

Further, in FSS, the difference in sheet resistance between the conductive portion and the non-conductive portion at 20 ° C. may be 50 Ω / □ or more, preferably 100 Ω / □ or more, and more preferably 1000 Ω / □ or more.

The material constituting the conductive portion of FSS is not particularly limited, and for example, tin oxide (SnO ₂ : F, Sb) doped with at least one of Ag, indium tin oxide (ITO), Cu, Al, fluorine and antimony is used. , Titanium nitride, niobide, chromium nitride, zirconium nitride and hafnium nitride and other metals.

Among them, it is preferable to contain at least one selected from the group consisting of tin oxide (SnO ₂ : F, Sb) doped with at least one of Ag, ITO, fluorine and antimony, and Cu. The non-conductive portion may be, for example, a dielectric material constituting the dielectric layer or air.

The sheet resistance of the conductive portion of the FSS in this embodiment is preferably 50 Ω / □ or less, more preferably 30 Ω / □ or less, and even more preferably 10 Ω / □ or less. When the sheet resistance of the conductive portion is within the above range, the conductive portion and the non-conductive portion of the FSS effectively function as an inductor or a capacitor, so that the radio wave transmission property is improved.

The sheet resistance of the conductive part of the FSS can be measured by using, for example, a non-contact eddy current method manufactured by DELCOM, a resistance value measuring device 717, a conductance monitor.

When the FSS loading member according to the present embodiment is used as a window member, it is preferable that the non-conductive portion of the FSS has at least one component of a component in the horizontal direction and a component in the direction perpendicular to the ground. This is because when used as a window member such as a window member for a vehicle, a part of the non-conductive portion is horizontal to the ground, so that the radio wave transmission of vertically polarized waves becomes good. Further, since a part of the non-conductive portion is perpendicular to the ground, the radio wave transmission of horizontally polarized waves is improved.

Further, the shape of the FSS in a plan view is not particularly limited. As a specific example, the shape of the FSS in the present embodiment in a plan view (XY plane) will be described below in FIGS. 3A and 3B, but the shape of the FSS is not limited thereto.

First, the FSS 30a shown in FIG. 3A has a conductive portion 31a and a non-conductive portion 32a, and the non-conductive portion 32a is formed in a double lattice stripe shape in a plan view.

Here, the double plaid is a plaid in which a plurality of double vertical lines and a plurality of double horizontal lines are formed orthogonally to each other. In other words, the double plaid is a double plaid consisting of a conductive portion 31a and a non-conductive portion 32a along the X-axis direction and the Y-axis direction perpendicular to the X axis. It refers to the formed shape.

With such a shape, there is an advantage that the degree of freedom in design is high because one unit A of repetition is composed of a plurality of dimensional parameters. In the FSS 30a shown in FIG. 3A, one unit A (basic pattern) of a quadrangle composed of a conductive portion 31a and a non-conductive portion 32a is regularly arranged two-dimensionally in the X-axis direction and the Y-axis direction without gaps. Consists of patterns that are

In the FSS 30a shown in FIG. 3A, one unit A of a quadrangle may be a square having the same length on each side or a rectangle having different lengths on two sides. Further, the length of one side in the Y-axis direction of the rectangular conductive portion 31a formed by being sandwiched between the adjacent double lattices (the shortest distance between the adjacent double lattices in the Y-axis direction) L1, in the double lattice. The length L2 of the conductive portion 31a formed in the above and the width G of the non-conductive portion 32a forming the double lattice fringes can be appropriately set.

L1 and L2 are preferably 0.05 mm to 5 mm, and the width G is preferably 0.01 mm to 0.5 mm. In FIG. 3A, the length L1, the length L2, and the width G of the FSS are all shown as the length or the width in the Y-axis direction, but each of the above in the X-axis direction. The dimensions may be within the above preferable numerical range.

Further, the loading area of the FSS 30a in the FSS loading member can be appropriately set, but when the wavelength in the air corresponding to the frequency F of the transmitted radio wave is λ (mm), λ ² mm ² or more is preferable, and 2λ ² M2 or more is more preferable, and 3λ ² mm ² or ^more is further preferable.

Further, the width G of the non-conductive portion 32a is more preferably 250 μm or less, further preferably 200 μm or less. The width G of the non-conductive portion 32a is preferably 10 μm to 250 μm, more preferably 10 μm to 200 μm. When the width G of the non-conductive portion 32a is within the above range, the electric field is concentrated on the non-conductive portion 32a and effectively acts as a capacitance, so that the radio wave transmission property is improved.

Further, when the FSS loading member according to the present embodiment is used as a window member, it is preferable that the non-conductive portion of the FSS has at least one component in the horizontal direction and the vertical direction with respect to the ground. Here, the components in the horizontal direction with respect to the ground are a plurality of double components in the FSS shown in FIG. 3 (A) when installed in the windshield for a vehicle in the direction shown in FIG. 3 (A). The horizontal line corresponds. Further, the components in the direction perpendicular to the ground are a plurality of double vertical components in the FSS shown in FIG. 3 (A) when installed on the windshield for the vehicle in the direction shown in FIG. 3 (A). The line is applicable.

As another shape of the FSS, the FSS 30b shown in FIG. 3B has a conductive portion 31b and a non-conductive portion 32b, and a circular loop in which a plurality of ring-shaped non-conductive portions 32b are formed in a plan view. It has a slot shape. The FSS 30b having such a shape includes a circular loop slot in which the hexagons constituting the portion A are regularly arranged in a triangular array (along the XY plane) so as to share each side of the hexagon. Can be filled efficiently. The FSS30b shown in FIG. 3B has an advantage that the degree of freedom in design can be increased because the distance between slots can be made smaller than that of the square arrangement like the FSS30a shown in FIG. 3A.

Of the above portion A in the FSS 30b of FIG. 3B, the length p from each apex of the hexagon to the center (center of gravity), the radius of the virtual circle c passing through the center of the width W of the ring-shaped non-conductive portion 32b. t, The length of the width W of the ring-shaped non-conductive portion 32b can be appropriately set. The radius t is shorter than the length p, and the width W is shorter than the length p.

The length p is preferably 0.25 mm to 3 mm, t is preferably 0.3 mm to 1.5 mm, and the width W is preferably 0.03 mm to 1 mm. Further, the loading area of the FSS 30b in the FSS loading member can be appropriately set, but when the wavelength in the air corresponding to the frequency F of the transmitted radio wave is λ (mm), λ ² mm ² or more is preferable, and 2λ ² M2 or more is more preferable, and 3λ ² mm ² or ^more is further preferable.

Further, the width W of the non-conductive portion is more preferably 250 μm or less, further preferably 200 μm or less. That is, the width W is more preferably 30 μm to 250 μm, and even more preferably 30 μm to 200 μm. When the width W of the non-conductive portion is within the above range, the electric field is concentrated on the non-conductive portion and works effectively as a capacitance, so that the radio wave transmission property is improved.

In the FSS 30b shown in FIG. 3B, the ring-shaped non-conductive portion 32b can appropriately design the length p, radius t, and width W in each portion A within the above numerical ranges. Further, the non-conductive portions 32c may be designed so that the distances between the centers of the adjacent ring-shaped non-conductive portions are all equal. In other words, in a plan view, a regular hexagonal portion A composed of a conductive portion 31c and a non-conductive portion 32c is regarded as one unit, and the regular hexagonal portion A has the same center as the center of the regular hexagon. Further, it may have a circular loop slot shape including a ring-shaped non-conductive portion 32b formed inside a regular hexagon and other conductive portions 31b.

Further, when the FSS loading member according to the present embodiment is used as a window member, it is preferable that the non-conductive portion of the FSS has at least one component in the horizontal direction and the vertical direction with respect to the ground. Here, the components in the horizontal direction with respect to the ground are the upper part and the lower part of the circle in the FSS shown in FIG. 3B when the windshield is installed in the windshield for the vehicle in the direction shown in FIG. Part of is applicable. Further, the components in the direction perpendicular to the ground are the left and right parts of the circle in the FSS shown in FIG. 3 (B) when installed on the windshield for the vehicle in the direction shown in FIG. 3 (B). Part of the department is applicable.

When the FSS loading member according to the present embodiment has a plurality of FSSs, the FSS loading member can be designed by arbitrarily combining the above-mentioned FSS shape patterns in the plan view for each FSS.

The thickness of the FSS is not particularly limited, but is preferably 0.1 mm or less, more preferably 0.05 mm or less, still more preferably 0.02 mm or less, from the viewpoint of improving radio wave transmission. The thickness of the FSS may be 0.003 μm or more, preferably 0.005 μm or more, and more preferably 0.010 μm or more, from the viewpoint of stability of the conductive portion as a film.

The FSS selectively transmits radio waves of a predetermined frequency F, but the predetermined frequency F transmitted through the FSS loading member is preferably included in the range of 1 GHz to 100 GHz.

Further, the radio wave having a frequency F is more preferably 10 GHz or more, and further preferably 20 GHz or more, from the viewpoint that the radio wave transmission of the FSS loading member by FSS is easily improved.

Further, the upper limit of the frequency F is not particularly limited, but may be, for example, 90 GHz or less, or 80 GHz or less. For example, in the case of laminated glass for vehicles, the attenuation for radio waves having a frequency F of 10 GHz or higher tends to be large, and by loading the FSS for radio waves having a frequency F of 10 GHz or higher, the radio wave transparency is improved. It is effective.

Further, the total thickness of the FSS loading member according to the present embodiment is preferably 1.5 mm or more, preferably 2.0 mm or more, preferably 4.0 mm or more, for the reason that it is easy to handle and maintain a predetermined strength. More preferred. Here, the total thickness of the FSS-loaded member means the thickness of the FSS-loaded member in the area where the FSS is loaded in a plan view. The total thickness of the FSS loading member according to the present embodiment is not particularly limited, but is preferably 40 mm or less, more preferably 30 mm or less because the weight of the FSS loading member becomes large.

Hereinafter, a preferable loading mode of FSS in the FSS loading member according to the present embodiment will be described. When the FSS loading member according to the present embodiment has a plurality of FSSs, the FSS loading member can be designed by arbitrarily combining the loading patterns described later for each FSS.

It is preferable that the laminated member of the FSS loading member according to the present embodiment has two continuous intermediates as a dielectric layer, and the FSS is provided between the two continuous intermediates. That is, among the dielectric layers constituting the laminated member in the FSS loaded member 20 shown in FIG. 4, a part of two continuous dielectric layers are intermediates, and the first intermediate 21 and the second intermediate are intermediates. An FSS is provided between the body 22 and a. In this case, n is an integer of 4 or more.

Further, as the two continuous intermediates (dielectric layers), a resin material is preferable, and the same resin material is more preferable. For example, PVB may be used for both the first intermediate 21 and the second intermediate 22, or EVA may be used for both. It is preferable that the first intermediate 21 and the second intermediate 22 are made of the same material because the adhesion is improved and changes in physical properties such as changes in optical characteristics at these interfaces and changes in thermal expansion due to temperature changes are reduced.

By providing the FSS between the intermediates in this way, the surface of the FSS loading member outside the vehicle with respect to the radio wave transmission direction (the surface of the nth layer opposite to the n-1th layer). ) And the distance (d2) to the inner surface of the vehicle (the surface of the first layer opposite to the second layer side) are substantially the same and have a substantially symmetrical configuration. That is, the FSS is provided at a position where the distances (d1 and d2) from the two outermost surfaces of the FSS loading member are substantially the same. As a result, the reflection of the entire FSS loading member can be effectively reduced, so that the radio wave transmission is improved.

Here, the distance (d1) from the FSS to the outer surface of the vehicle and the distance (d2) to the inner surface of the vehicle are substantially the same in the range of 90% to 110% for d1 / d2 or d2 / d1. Say that. For d1 / d2 or d2 / d1, the range of 95% to 105% is preferable, the range of 97% to 103% is more preferable, and the range of 98% to 102% is further preferable.

In particular, when the FSS loading member is used as a window glass for a vehicle, the number of layers n of the dielectric layer is set to n = 4, and the first glass substrate, the first resin layer, and the second resin layer are in order from the first layer. , A configuration in which the second glass substrate is used can be mentioned. In this case, it is preferable that the thickness of the first glass substrate and the thickness of the second glass substrate are substantially the same, and the thickness of the first resin layer and the thickness of the second resin layer are substantially the same. It is advisable to provide an FSS between the two intermediates (first resin layer and second resin layer). It is more preferable that the materials of the first glass substrate and the second glass substrate are the same, and the materials of the first resin layer and the second resin layer are the same.

When the FSS loading member is used as a window glass for a vehicle, the number of layers n of the dielectric layer is set to n = 5, and the first glass substrate, the first resin layer, and the third resin layer are ordered from the first layer. , A second resin layer and a second glass substrate. In this case, it is preferable that the thickness of the first glass substrate and the thickness of the second glass substrate are substantially the same, and the thickness of the first resin layer and the thickness of the second resin layer are substantially the same. Further, by providing the FSS on the third resin layer, it is preferable to provide the FSS between two continuous intermediates (the first resin layer and the third resin layer, or the second resin layer and the third resin layer).

Here, as the third resin layer, a resin layer that is very thin with respect to the total thickness of the FSS loaded member can be used, such as PET, and in this case, the thickness of the third resin layer in the FSS loaded member can be ignored. Therefore, the distance of the FSS loading member from the FSS to the surface on the outside of the vehicle (the surface of the nth layer opposite to the n-1 layer) and the surface on the inside of the vehicle (of the first layer) with respect to the radio wave transmission direction. The distance to the surface on the side opposite to the second layer side) is substantially the same.
Further, it is more preferable that the materials of the first glass substrate and the second glass substrate are the same, and the materials of the first resin layer and the second resin layer are the same.

Further, in the FSS loading member according to the present embodiment, the FSS may be provided on at least one of the two outermost surfaces of the laminated member. That is, FSS may be provided on at least one of the outermost surface a on the first layer side and the outermost surface b on the nth layer side of the FSS loading member 30 shown in FIG. As described above, in the FSS loading member according to the present embodiment, the reflection on the outermost surface can be efficiently reduced by providing the FSS on at least one of the two outermost surfaces of the laminated member, so that the radio wave transmission is transmitted. Is improved. Further, in the FSS loading member according to the present embodiment, FSS may be provided on both of the two outermost surfaces of the laminated member.

The method for manufacturing the FSS loading member according to the present embodiment is not particularly limited. As a method of loading the FSS on the main surface of the dielectric layer, it may be formed directly on the main surface of the dielectric layer or indirectly. For example, a conductor layer on a film such as a resin may be patterned in advance to form an FSS, and the FSS together with the resin may be attached to the main surface of the dielectric layer. Alternatively, the FSS may be directly loaded on the main surface of the dielectric layer by plating a desired metal or the like on the main surface of the dielectric layer or using a sputtering method. After that, an FSS loaded member may be obtained by laminating a dielectric layer such as a dielectric substrate or an intermediate, and performing a step of heating and pressurizing.

Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.

[Measurement of sheet resistance of FSS conductive part]
The sheet resistance of the conductive portion of the FSS in Examples and Comparative Examples was measured using a non-contact eddy current method manufactured by DELCOM and a resistance value measuring device 717 conductance monitor.

[FSS dimension measurement]
Various dimensions of FSS in Examples and Comparative Examples were measured using an Olympus optical microscope DSX-500.

[Evaluation of optical characteristics]
Transmittance / reflection spectra from 250 nm to 2500 nm are measured using a Hitachi spectrophotometer U-4100, and based on ISO9050: 2003, solar reflectance Re, solar transmittance Te, visible light reflectance Rv, and visible light reflectance color tone. (Rva ^* , Rvb ^* ), visible light transmittance Tv, and visible light transmittance (Ta ^* , Tb ^* ) were calculated.

[Radio transmission evaluation]
Reflection characteristics (S11) when a vertically polarized wave (TM wave) or a horizontally polarized wave (TE wave) of 28 GHz or 78 GHz is incident on an FSS loaded member or a laminated member in Examples and Comparative Examples at a predetermined incident angle. And the transmission characteristic (S21) was calculated. For these, the values at 28 GHz and 78 GHz were calculated based on the values of the relative permittivity ε _r and the dielectric loss tangent tan δ (δ is the loss angle) of each material used at 1 GHz. Here, the incident angle means the angle in the incident direction of the radio wave of frequency F from the normal of the main surface of the FSS loading member.

Specifically, the antennas were opposed to each other, and each of the obtained FSS loading members or laminated members was installed between them so that the incident angle was a predetermined angle. Then, for vertically polarized waves (TM waves) or horizontally polarized waves (TE waves) having a frequency of 28 GHz or 78 GHz, the reflection characteristics (S11) are set to 0 [dB] when there is no radio wave transmitting substrate at the opening of 100 mmΦ. ) And the transmission characteristics (S21) were measured.

[Manufacturing of FSS loading members]
The FSS loading member was manufactured by the following procedure. In addition, Example 1, Example 3, Example 4 corresponds to Example, and Example 2 corresponds to a comparative example.

<Example 1>
First, a multilayer film containing Ag and zinc oxide was formed on a PET film having a thickness of 0.1 mm by a sputtering method so that the sheet resistance became 2 Ω / □, and then a laser having a wavelength of 532 nm was used. The double lattice-striped first frequency selection surface F11 shown in FIG. 3A was formed. The dimensions of each part of the frequency selection surface F11 shown in FIG. 3A are width G: 0.03 mm, L1: 0.2 mm, and L2: 0.24 mm.

Subsequently, as shown in FIG. 6, a first dielectric substrate 111 made of soda lime glass having a thickness of 1.98 mm, a first intermediate 112 made of a PVB film having a thickness of 0.38 mm, and a first frequency selection surface F11. A third intermediate 113 made of PET film having a thickness of 0.1 mm, a second intermediate 114 made of PVB film having a thickness of 0.38 mm, and a second dielectric substrate 115 made of soda lime glass having a thickness of 1.98 mm. The frequency-selective surface-loaded member 110 of Example 1 was produced by laminating the members in the order of 1 and heating them at 130 ° C. for 90 minutes under a pressure of 1 MPa and slowly cooling them. The first dielectric substrate 111, the first intermediate 112, the third intermediate 113, the second intermediate 114, and the second dielectric substrate 115 are all squares having a main surface of 300 mm × 300 mm. Table 1 shows the relative permittivity, dielectric loss tangent, thickness, various dimensions and transmission phase of FSS, and total thickness of the dielectric substrate and intermediate.

<Example 2>
The thickness is 0. Between the first dielectric substrate 211 made of soda lime glass having a main surface of 300 mm × 300 mm and a thickness of 1.98 mm and the second dielectric substrate 213 made of soda lime glass having a thickness of 1.98 mm. A first intermediate 212 made of a 76 mm PVB film was inserted, heated at 130 ° C. for 90 minutes under a pressure of 1 MPa and slowly cooled to prepare the laminated member 210 of Example 2 shown in FIG. 7. The first dielectric substrate 211, the first intermediate 212, and the second dielectric substrate 213 are all squares having a main surface of 300 mm × 300 mm. Table 1 shows the relative permittivity, dielectric loss tangent, thickness, and total thickness of the dielectric substrate and the intermediate.

<Example 3>
A 10 μm-thick Cu film is formed on a 0.38 mm-thick PVB film by plating, and then etched to select the first frequency of the double lattice stripes shown in FIG. 3 (A) on the PVB film. The surface F11 is formed. The dimensions of each part of the first frequency selection surface F11 shown in FIG. 3A are width G: 0.03 mm, L1: 0.16 mm, L2: 0.26 mm.
Subsequently, as shown in FIG. 6, a square having a main surface of 300 mm × 300 mm, a first dielectric substrate 111 made of borosilicate glass having a thickness of 2.00 mm, and a first intermediate body made of a PVB film having a thickness of 0.38 mm. 112, the first frequency selection surface F11, the second intermediate 114 made of PVB film with a thickness of 0.38 mm, and the second dielectric substrate 115 made of borosilicate glass with a thickness of 2.00 mm, respectively. The frequency-selective surface-loaded member 110 of Example 3 is manufactured by laminating the members, heating them at 130 ° C. for 90 minutes under a pressure of 1 MPa, and slowly cooling them. In this example, the third intermediate 113 shown in FIG. 6 is not provided. Table 1 shows the relative permittivity, dielectric loss tangent, thickness, and total thickness of the dielectric substrate and the intermediate.

<Example 4>
A 10 μm-thick Cu film is formed on a 0.38 mm-thick PVB film by plating, and then etched to select the first frequency of the circular loop slot shape shown in FIG. 3 (B) on the PVB film. The surface F11 is formed. The dimensions of each part of the frequency selection surface F51 shown in FIG. 3B are periodic regular hexagons having p: 0.54 mm, t: 0.44 mm, and W: 0.055 mm on the first frequency selection surface F51. Let it be a pattern.
Subsequently, as shown in FIG. 6, a square having a main surface of 300 mm × 300 mm, a first dielectric substrate 111 made of soda lime glass having a thickness of 1.98 mm, and a first intermediate body made of a PVB film having a thickness of 0.38 mm. 112, the first frequency selection surface F11, the second intermediate 114 made of PVB film with a thickness of 0.38 mm, and the second dielectric substrate 115 made of soda lime glass with a thickness of 1.98 mm, respectively. The frequency-selective surface-loaded member 110 of Example 4 is manufactured by laminating the members, heating them at 130 ° C. for 90 minutes under a pressure of 1 MPa, and slowly cooling them. In this example, the third intermediate 113 shown in FIG. 6 is not provided. Table 1 shows the relative permittivity, dielectric loss tangent, thickness, and total thickness of the dielectric substrate and the intermediate.

Table 2 shows the results of optical characteristic evaluation of the frequency-selective surface-loaded member or laminated member of Examples 1 to 4, and Table 3 shows the results of radio wave transmission evaluation.

Comparing Example 1 and Example 2 from the results in Table 2, the FSS loading member of Example 1 in which the FSS is arranged at a predetermined position has a higher solar reflectance and the solar transmittance than Example 2 in which the FSS is not provided. Was a low result. Further, comparing Example 3 and Example 4 with Example 2, the FSS loading member of Example 3 and Example 4 in which the FSS is arranged at a predetermined position has a higher solar reflectance than Example 2 in which the FSS is not provided, and The result was that the solar transmittance was low.

Further, comparing Example 1 and Example 2 from the results of Table 3, the FSS loading member of Example 1 in which the FSS is arranged at a predetermined position has a lower reflection characteristic S11 at 78 GHz than that of Example 2 in which the FSS is not provided. Moreover, the transmission characteristic S21 is high, and the radio wave transparency is improved. Further, comparing Example 3 and Example 4 with Example 2, the FSS loading member of Example 3 and Example 4 in which the FSS is arranged at a predetermined position has a lower reflection characteristic S11 at 78 GHz than that of Example 2 in which the FSS is not provided. Moreover, the transmission characteristic S21 is high, and the radio wave transparency is improved.
Therefore, it was found that the FSS loading member of the present invention has good thermal characteristics and radio wave transmission.

Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, which naturally belong to the technical scope of the present invention. Understood. Further, each component in the above-described embodiment may be arbitrarily combined as long as the gist of the invention is not deviated.

This application is based on the Japanese patent application filed on August 3, 2020 (Japanese Patent Application No. 2020-131976), the contents of which are incorporated herein by reference.

10, 20, 30, 110 Frequency selection surface loading member 111, 115, 211,213 Dielectric substrate 21, 22, 112, 113, 114 Intermediate 210 Laminated member 30a, 30b, F11 Frequency selection surface 31a, 31b Conductive part 32a , 32b Non-conductive part

Claims (25)

1. It has a laminated member having a total of n dielectric layers laminated in order from the first layer to the nth layer (where n is an integer of 3 or more).
   A frequency selection surface that transmits radio waves of a predetermined frequency F is provided on at least one of the main surfaces of the dielectric layer constituting the laminated member.
   The frequency selection surface has a conductive portion and a non-conductive portion, and has a conductive portion and a non-conductive portion.
   A frequency-selective surface-loaded member having an ISO 9050: 2003 solar transmittance of 54% or less.
2. The laminated member has two continuous intermediates as a dielectric layer other than the dielectric layer of the outermost layer of the laminated member, and the frequency selection surface is provided between the two continuous intermediates. The frequency-selective surface-loaded member according to claim 1.
3. The frequency-selective surface loading member according to claim 2, wherein the two consecutive intermediates are made of the same resin material.
4. The frequency-selective surface loading member according to claim 3, wherein the resin material is PVB or EVA.
5. The frequency-selective surface loading member according to any one of claims 1 to 4, wherein the first layer and the nth layer are glass substrates.
6. The first layer or the nth layer is a shielding layer that shields visible light, and at least a part of the frequency selection surface overlaps with the shielding layer in a plan view of the laminated member, claims 1 to 4. The frequency selection surface loading member according to any one of the above items.
7. The frequency-selective surface loading member according to claim 6, wherein the dielectric layer adjacent to the shielding layer is a glass substrate.
8. The distance from the frequency selection surface to the surface of the first layer opposite to the second layer, and the distance from the frequency selection surface to the surface of the nth layer opposite to the n-1 layer. The frequency-selective surface-loaded member according to any one of claims 1 to 7, wherein is substantially the same.
9. The laminated member is composed of four dielectric layers, and the first glass substrate, the first resin layer, the second resin layer, and the second glass substrate are laminated in this order from the first layer. The frequency selection surface loading member according to any one of the above items.
10. The laminated member is composed of five dielectric layers, and a first glass substrate, a first resin layer, a third resin layer, a second resin layer, and a second glass substrate are laminated in this order from the first layer. The frequency-selective surface-loaded member according to any one of claims 1 to 8.
11. The frequency selection surface loading member according to any one of claims 1 to 10, wherein the frequency selection surface is provided on at least one of the two outermost surfaces of the laminated member.
12. The frequency-selective surface loading member according to any one of claims 1 to 11, wherein the visible light transmittance specified in ISO 9050: 2003 is 60% or more.
13. The frequency-selective surface loading member according to any one of claims 1 to 12, wherein the solar reflectance specified in ISO 9050: 2003 is 8% or more.
14. The frequency-selective surface loading member according to any one of claims 1 to 13, wherein the visible light reflectance specified in ISO 9050: 2003 is 15% or less.
15. The frequency selection surface loading member according to any one of claims 1 to 14, wherein the visible light reflection color tone Rva ^* is -10 to 5 and Rvb ^* is -10 to 10 specified in ISO 9050: 2003. ..
16. The frequency selection surface loading member according to any one of claims 1 to 15, wherein Ta ^* of the visible light transmission color tone defined in ISO 9050: 2003 is -8 to 5 and Tb ^* is -8 to 6. ..
17. The frequency selection surface loading member according to any one of claims 1 to 16, wherein the width G of the non-conductive portion of the frequency selection surface is 0.01 mm to 0.5 mm.
18. The frequency selection surface loading member according to any one of claims 1 to 17, wherein the sheet resistance of the conductive portion of the frequency selection surface is 50Ω / □ or less.
19. Any one of claims 1 to 18, wherein the conductive portion of the frequency selection surface comprises at least one selected from the group consisting of tin oxide doped with at least one of Ag, ITO, fluorine and antimony, and Cu. Frequency selective surface loading member according to.
20. Any one of claims 1 to 19, wherein when the frequency selective surface loading member is used as a window member, the non-conductive portion of the frequency selective surface has at least one component in the horizontal direction and the vertical direction with respect to the ground. The frequency selection surface loading member described in.
21. The frequency selection surface loading member according to any one of claims 1 to 20, which has a first region having the frequency selection surface and a second region not having the frequency selection surface in a plan view.
22. The frequency selection surface loading member according to claim 21, wherein the outer edge of the first region is inside the outer edge of the second region in a plan view.
23. The frequency selection surface loading member according to any one of claims 1 to 22, wherein the frequency F is included in the range of 1 GHz to 100 GHz.
24. A window member for a vehicle provided with the frequency selection surface loading member according to any one of claims 1 to 23.
25. The vehicle window member according to claim 24, wherein the frequency selection surface loading member is a windshield for a vehicle.

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