WO2022030394A1

WO2022030394A1 - Frequency selection surface loading member

Info

Publication number: WO2022030394A1
Application number: PCT/JP2021/028384
Authority: WO
Inventors: 章代野上; 達雄長嶋; 修加賀谷; 久二男榊原
Original assignee: Ａｇｃ株式会社
Priority date: 2020-08-03
Filing date: 2021-07-30
Publication date: 2022-02-10
Also published as: JP7683608B2; JPWO2022030394A1

Abstract

An embodiment of the present invention pertains to a frequency selection surface loading member comprising a laminate member which includes a total of n-number (n is integer of 3 or more) of dielectric layers sequentially laminated from a first layer to a n-th layer. A frequency selection surface that allows transmission of an electrical wave of a prescribed frequency F therethrough is provided to at least one of the main surfaces of the dielectric layers forming the laminate member. The frequency selection surface has a conductive part and a nonconductive part, and has a total thickness of 1.5 mm or more.

Description

Frequency selection surface loading member

The present invention relates to a frequency selective surface loading 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 than in 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.

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 radio wave transmittance is improved with the use of the high frequency band of communication. Is required.

In response to the above problem, for example, in Patent Document 1, in a vehicle windshield, radar waves are transmitted and received via a frequency selection plate (FSS), and an object existing outside the windshield is detected. A method of detecting an object by an in-vehicle radar device and an in-vehicle radar system have been proposed.

Japanese Patent Application Laid-Open No. 2018-179706

However, in a laminated member composed of a plurality of dielectric layers such as laminated glass and double glazing, what kind of FSS should be specifically arranged on which main surface of the dielectric layer can improve radio wave transmission. It was not easy to design due to the large number of parameters to be considered, and it has not been clarified in the past.

The present invention provides a frequency-selective surface-loaded member having excellent radio wave transmission, in which a frequency-selective surface is loaded on a laminated member composed of a plurality of dielectric layers.

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 total thickness is 1.5 mm or more.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the frequency selective surface is provided on at least one of the two outermost surfaces of the laminated member, and at least one of the two outermost surfaces. The transmission phase of the frequency selection surface provided in the above may be −50 ° to + 50 °.

Further, the frequency selective surface loading member according to one aspect of the present invention is at least between the first layer and the second layer of the laminated member and between the nth layer and the n-1 layer of the laminated member. One is provided with the frequency selection surface, at least one between the first layer and the second layer of the laminated member and between the nth layer and the n-1 layer of the laminated member. The transmission phase of the frequency selection surface provided in the above may be −30 ° to + 30 °.

Further, the frequency selective surface loading member according to one aspect of the present invention is between the second layer and the third layer of the laminated member and between the n-1 layer and the n-2 layer of the laminated member. At least one of the above is provided with the frequency selection surface (where n is an integer of 4 or more), between the second and third layers of the laminated member, and the n-1 of the laminated member. The transmission phase of the frequency selection surface provided at least one between the layer and the n-2th layer may be −55 ° to + 25 °.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the frequency selective surface is provided on any two or more of the main surfaces of the dielectric layers constituting the laminated member, and the two or more are provided with the frequency selective surface. The transmission phase of the provided frequency selection surface may be −45 ° to + 25 °.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the relative permittivity of the dielectric layer of the laminated member may be 1 or more and 7.2 or less.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the relative permittivity of the dielectric layers of the first layer and the nth layer of the laminated member may be 2.3 or more and 7.2 or less.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the non-conductive portion of the frequency selective surface is formed in a double lattice stripe shape in a plan view, and one unit of a quadrangle is regularly arranged in a two-dimensional shape. They may be arranged without gaps.

Further, in the frequency selective surface loading member according to one aspect of the present invention, in the frequency selective surface, the conductive portion is formed in a double lattice stripe shape in a plan view, and one unit of a quadrangle is regularly gapped in a two-dimensional shape. May be arranged without.

Further, in the frequency selection surface loading member according to one aspect of the present invention, the frequency selection surface has a shortest distance L1 between adjacent double lattices and a length L2 formed in the double lattices of 0 in a plan view. It may be 0.05 mm to 5 mm, and the width G of the double lattice fringes may be 0.03 mm to 1 mm.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the frequency selective surface may be formed with a plurality of ring-shaped non-conductive portions in a plan view.

Further, in the frequency selection surface loading member according to one aspect of the present invention, the plurality of ring-shaped non-conductive portions may have the same distance between the centers of adjacent ring-shaped non-conductive portions.

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, the non-conductive portion of the frequency selective surface may contain at least one selected from PVB, EVA and air.

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

Further, in the frequency selective surface loading member according to one aspect of the present invention, the radio wave having the frequency F may be vertically polarized wave or horizontally polarized wave incident at an incident angle of 0 ° to 80 °.

Further, in the frequency selective surface loading member according to one aspect of the present invention, the radio wave having the frequency F may be vertically polarized wave or horizontally polarized wave incident at an incident angle of 60 ° to 70 °.

According to the present invention, it is possible to provide a frequency-selective surface-loaded member having an excellent radio wave transmission property, in which a frequency-selective surface is loaded on a laminated member composed of a plurality of dielectric layers.

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) to 3 (C) 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 shape in which the conductive portion is formed in a double lattice stripe shape. FIG. 3C shows a circular loop slot shape 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 an FSS loaded member according to another embodiment of the present invention. FIG. 7 is a cross-sectional view of the FSS loading member of Example 1. FIG. 8 is a cross-sectional view of the FSS loading member of Example 2. FIG. 9 is a cross-sectional view of the FSS loading member of Example 3. FIG. 10 is a cross-sectional view of the FSS loading member of Example 4. FIG. 11 is a cross-sectional view of the FSS loading member of Example 5. FIG. 12 is a cross-sectional view of the FSS loading member of Example 6. FIG. 13 is a cross-sectional view of the FSS loading member of Example 7. FIG. 14 is a cross-sectional view of the FSS loading member of Example 8. FIG. 15 is a cross-sectional view of the FSS loading member of Example 9. FIG. 16 is a cross-sectional view of the FSS loading member of Example 10.

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 specification, 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 (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 the FSS loading member has a total thickness of 1.5 mm or more.

As described above, in the FSS loading member according to the present embodiment, when an FSS that transmits a radio wave of a predetermined frequency F is loaded on a laminated member having a plurality of dielectric layers, the total thickness of the FSS loading member has a specific range. Based on the above, we have found certain indicators for the characteristics of FSS that improve radio wave transmission and the loading surface of FSS.

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.

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 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, "upper part" can exemplify a region from the upper side of the windshield to a distance of 0.3 × D or less, and “lower part”. Can exemplify a region from the lower edge of the windshield 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.

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, and more preferably 4.0 mm or more, for the reason that it is easy to handle and maintain a predetermined strength. .. 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.

Further, the total thickness of the FSS loading member according to the present embodiment is not particularly limited, but 40 mm or less is preferable, and 30 mm or less is more preferable because the weight of the FSS loading member becomes large.

When the total thickness of the FSS loading member according to the present embodiment is 1.5 mm or more, the wavelength of the frequency F and the total thickness of the FSS loading member when a radio wave having a frequency F of 1 GHz to 100 GHz passes through the FSS loaded member. Is the same scale. Therefore, the FSS loading member can improve the radio wave transmission by designing the loading surface of the FSS and the specific shape of the FSS in consideration of the interference of the reflected waves at a plurality of interfaces in the laminated member.

On the other hand, if the FSS loading member is improperly laminated with the FSS on the dielectric member or the FSS design is inappropriate, the radio wave transmission may not be improved. However, in the FSS transmission member according to the present embodiment, in order to realize excellent radio wave transmission, the location of the FSS provided in the laminated member, the transmission phase of the FSS, and the appropriate shape of the FSS have been found.

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, a heat ray reflecting layer, and the like. 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 the FSS means a portion of the FSS 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.

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 of the plan view (XY plane) will be described below in FIGS. 3A to 3C, 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 in the Y-axis direction 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), it is preferably λ ² mm ² or more, and 2λ ² mm. ² 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.

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 the conductive portion 31b is formed in a double lattice stripe shape in a plan view. In other words, the conductive portion 31b has a shape formed in a double lattice stripe shape composed of lines along the X-axis direction and the Y-axis direction perpendicular to the X-axis. This is a shape in which the conductive portion 31a and the non-conductive portion 32a are interchanged in the shape of the FSS 30a in the FSS loading member shown in FIG. 3A.

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. One unit A of a quadrangle may be a square having the same length on each side, or a rectangle having two sides having different lengths.

Further, the length of one side in the Y-axis direction of the non-conductive portion 32b of the quadrangle formed by being sandwiched between the adjacent double lattices (the shortest distance between the adjacent double lattices in the Y-axis direction) L1, the double lattice. The length L2 of the non-conductive portion 32b formed therein in the Y-axis direction and the length G of the width G of the conductive portion 31b forming the double lattice fringes can be appropriately set. L1 and L2 are preferably 0.01 mm to 10 mm, and the width G is preferably 0.03 mm to 1 mm.

In FIG. 3B, 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 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.

As another shape of the FSS, the FSS 30c shown in FIG. 3C has a conductive portion 31c and a non-conductive portion 32c, and a circular loop in which a plurality of ring-shaped non-conductive portions 32c are formed in a plan view. It has a slot shape. In the FSS 30c having such a shape, a circular loop slot includes a pattern 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 FSS30c shown in FIG. 3C has an advantage that the degree of freedom in design can be increased because the distance between slots can be made smaller than the square arrangement like the FSS30a shown in FIG. 3A.

Of the above portion A in the FSS 30c of FIG. 3 (C), the length p from each vertex 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 32c. t, the width W of the ring-shaped non-conductive portion 32c 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 30c 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. The width W is more preferably 30 μm to 250 μm, further 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 30c shown in FIG. 3C, the ring-shaped non-conductive portion 32c can appropriately set the length p, radius t, and width W in each portion A within the above numerical range. 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 32c formed inside a regular hexagon and other conductive portions 31c.

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.

Hereinafter, a preferable loading mode of FSS in the FSS loading member according to the present embodiment will be described. In the FSS loading member according to the present embodiment, when the FSS is provided on at least one of the main surfaces of the dielectric layer constituting the laminated member, the transmission phase of the FSS when the FSS is provided on a specific main surface is specified. By designing the FSS loading member so as to be within the range, the radio wave transmission can be improved. 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.

Here, the transmission phase (φ21) of the FSS is the transmission phase (deg) when the radio wave passes through the FSS, and represents the phase amount that changes when the radio wave passes through the FSS. The transmission phase of the FSS can be derived by calculation using, for example, the finite element method software HighTranscurencyStructureSimulator (HFSS) manufactured by Ansys, USA.

Here, the transmission phase (φ21) of the FSS can determine the configuration of the laminated member, the shape of the FSS, and the loading position of the FSS by the angle of incidence of the radio wave of the frequency F on the FSS loading member. In particular, in the FSS loading member according to the present embodiment, the incident angle of the radio wave having the frequency F can be appropriately set in the range of 0 ° to 80 °. The angle of incidence of the radio wave of frequency F on the FSS loading member is, for example, in the range of 0 ° to 70 °, in the range of 20 ° to 70 °, in the range of 35 ° to 70 °, and further in the range of 60 ° to 70 °. It can be set appropriately according to.

Further, the incident angle of the radio wave of frequency F with respect to the FSS loading member is an angle excluding the incident angle of 0 °, for example, in the range of 20 ° to 70 °, the vertically polarized wave (TM wave) or the horizontally polarized wave of the incident radio wave. It can be designed according to (TE wave). For example, when the FSS loading member is a window glass for a vehicle, particularly a windshield, the angle of the windshield with respect to the radio wave of the frequency F incident parallel to the horizontal plane is often about 67.5 °, and the incident angle is 60 °. It is preferable to design so that the transmission characteristic (S21) is improved according to the vertically polarized wave or the horizontally polarized wave of the incident radio wave in the range of about 70 °.

In the FSS loading member according to the present embodiment, when the FSS is provided on at least one of the two outermost surfaces of the laminated member, the transmission phase of at least one of the FSSs is preferably −50 ° to + 50 °. .. That is, when the FSS is 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 40 shown in FIG. 4, at least one of the FSS is provided. The transmission phase is preferably −50 ° to + 50 °. Both the outermost surface a and the outermost surface b are positions where radio waves having a frequency F first pass when they are incident on the first layer of the dielectric layer.

Since the transmission phase of the FSS provided at such a position is -50 ° to + 50 °, the reflected wave from each surface of the FSS loading member can be canceled and the reflection can be reduced, so that the radio wave transmission is improved. Further, in the FSS loading member according to the present embodiment, when the FSS is provided on both of the two outermost surfaces of the laminated member, the transmission phase of both FSS is preferably −50 ° to + 50 °.

The transmission phase of the FSS provided on at least one of the two outermost surfaces of the laminated member is preferably −45 ° or higher, more preferably −40 ° or higher. Further, in this case, the transmission phase of the FSS is preferably 45 ° or less, more preferably 40 ° or less. Further, in the FSS loading member according to the present embodiment, when the FSS is provided on both of the two outermost surfaces of the laminated member, it may be set in the preferable range.

Further, the conditions are that the incident angle of the radio wave of the frequency F in the FSS loaded member is 55 ° or more, the relative permittivity of the first layer and the nth layer of the laminated member of the FSS loaded member is 4 to 7, and the thickness is 1 mm to 4 mm. Originally, the transmission phase of the FSS is preferably −40 ° or higher, more preferably −30 ° or higher. Further, the transmission phase of the FSS is preferably 40 ° or less, more preferably 30 ° or less. 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.

In the FSS loading member according to the present embodiment, as shown in FIG. 5, between the first layer and the second layer of the laminated member a, and between the nth layer and the n-1 layer of the laminated member. Consider the case where the FSS is provided in at least one of b. At this time, in the FSS loading member according to the present embodiment, the transmission phase of at least one of the FSSs is preferably −30 ° to + 30 °.

In both of the above-mentioned inter-a and inter-b, after the radio wave of frequency F has passed through the outermost layer (first layer or nth layer) of the laminated member, the layer (second layer or second layer) located second from the outermost layer is counted. It corresponds to a place where it passes before being incident on the n-1 layer). Since the transmission phase of the FSS provided at such a position is −30 ° to + 30 °, the reflected wave from each surface of the FSS loading member can be canceled and the reflection can be reduced, so that the radio wave transmission property is improved. Further, in the FSS loading member according to the present embodiment, when the FSS is provided in both of the two layers of the laminated member, the transmission phase of both FSSs is preferably −30 ° to + 30 °.

The transmission phase of the FSS provided in at least one of the space between the first layer and the second layer of the laminated member and the space between the nth layer and the n-1 layer of the laminated member is -29. ° or more is preferable, −28 ° or higher is more preferable, and −26 ° or higher is even more preferable. Further, in this case, the transmission phase of the FSS is preferably 29 ° or less, more preferably 26 ° or less, and even more preferably 23 ° or less.

Further, the incident angle of the radio wave of frequency F is 55 ° or more, the relative permittivity of the first layer and the nth layer of the FSS loading member is 4 to 7, the thickness is 1 mm to 4 mm, and the second layer and the n-1 layer. Under the conditions that the relative permittivity is 1 to 7 and the thickness is 0.3 mm to 1.6 mm, the transmission phase of the FSS is preferably -30 ° or more, more preferably -20 ° or more, and -15. More than ° is more preferred.

Further, the transmission phase of the FSS under the same conditions is preferably 15 ° or less, more preferably 10 ° or less, and even more preferably 5 ° or less. Further, in the FSS loading member according to the present embodiment, both between the first layer and the second layer of the laminated member and between the nth layer and the n-1 layer of the laminated member b. Even when the FSS is provided, it may be set within the preferable range.

In the FSS loading member according to the present embodiment, as shown in FIG. 6, between the second layer and the third layer of the laminated member a, and the n-1 layer and the n-2 layer of the laminated member. When the FSS is provided in at least one of the interval b, it is preferable that the transmission phase of at least one of the FSS is −55 ° to + 25 °. However, in this case, n is an integer of 4 or more.

In both of the above-mentioned inter-a and inter-b, after the radio wave of frequency F has passed through the layer (second layer or n-1 layer) located second from the outermost layer (first layer or nth layer), It corresponds to the part that passes before the incident on the layer (third layer or n-2 layer) located third from the outermost layer. Since the transmission phase of the FSS provided at such a location is −55 ° to + 25 °, the reflected wave from each surface of the FSS loading member can be canceled and the reflection can be reduced, so that the radio wave transmission property is improved.

Further, in the FSS loading member according to the present embodiment, when the FSS is provided on both of the two outermost surfaces of the laminated member, the transmission phase of both FSS is preferably −55 ° to + 25 °.

The transmission phase of the FSS provided in at least one of the space between the second layer and the third layer of the laminated member and the space between the n-1 layer and the n-2 layer of the laminated member b is set. −53 ° or higher is preferable, −50 ° or higher is more preferable, and −47 ° or higher is even more preferable. The transmission phase of the FSS is preferably 23 ° or less, more preferably 20 ° or less, and even more preferably 17 ° or less.

Further, in the FSS loading member according to the present embodiment, between the second layer and the third layer of the laminated member and between the n-1 layer and the n-2 layer of the laminated member b. Even when the FSS is provided in both, it is preferable to set it in the preferable range.

Further, the incident angle of the radio wave of frequency F is 55 ° or more, the relative permittivity of the first layer and the nth layer of the FSS loading member is 4 to 7, the thickness is 1 mm to 4 mm, and the second layer and the n-1 layer. The relative permittivity is 1 to 7, the thickness is 0.1 mm to 1.6 mm, the relative permittivity of the third layer and the n-2 layer is 1 to 7, and the thickness is 0.1 mm to 4 mm. The transmission phase of the FSS is preferably −45 ° or higher, more preferably −35 ° or higher, and even more preferably −25 ° or higher. Further, the transmission phase of the FSS under the same conditions is preferably 25 ° or less, more preferably 20 ° or less, still more preferably 15 ° or less.

In the FSS loading member according to the present embodiment, when the FSS is provided on any two or more of the main surfaces of the dielectric layers constituting the laminated member, the transmission phase of at least one of the FSS is −45 °. ~ + 25 ° is preferable. Since the transmission phase of at least one of the FSS provided on the two or more main surfaces is −45 ° to + 25 °, the reflected wave from each surface of the FSS loading member can be canceled and the reflection can be reduced, so that the radio wave transmission is transmitted. Is improved.

Further, in the FSS loading member according to the present embodiment, when the FSS is provided on both of the two outermost surfaces of the laminated member, the transmission phase of both FSS is preferably −45 ° to + 25 °.

The transmission phase of at least one of the FSS provided on any two or more of the main surfaces of the dielectric layer constituting the laminated member is preferably −43 ° or higher, more preferably −40 ° or higher, and more preferably −37 °. The above is more preferable.

Further, the transmission phase of at least one of the FSS provided on the two or more main surfaces is preferably 24 ° or less, more preferably 22 ° or less, still more preferably 20 ° or less.

Further, in the FSS loading member according to the present embodiment, even when the FSS is provided on both of the two outermost surfaces of the laminated member, it is preferable to set the FSS in the preferable range.

Further, in the FSS loading member according to the present embodiment, at least one between the third layer and the fourth layer of the laminated member and between the n-2 layer and the n-3 layer of the laminated member. When the FSS is provided, it is preferable that at least one of the FSS has a transmission phase of −55 ° to + 25 °. However, in this case, n is an integer of 6 or more.

The transmission phase of the FSS provided in at least one between the third layer and the fourth layer of the laminated member and between the n-2 layer and the n-3 of the laminated member is −53 °. The above is preferable, −50 ° or higher is more preferable, and −47 ° or higher is further preferable.

Further, the transmission phase of the FSS under the same conditions is preferably 23 ° or less, more preferably 20 ° or less, and even more preferably 17 ° or less. Further, in the FSS loading member according to the present embodiment, between the third layer and the fourth layer a of the laminated member and between the n-2 layer and the n-3 layer b of the laminated member. Even when the FSS is provided in both, it is preferable to set it in the preferable range.

Further, in the FSS loading member according to the present embodiment, at least one between the fourth layer and the fifth layer of the laminated member and between the n-3 layer and the n-4 layer of the laminated member. When the FSS is provided, it is preferable that at least one of the FSS has a transmission phase of −55 ° to + 25 °. However, in this case, n is an integer of 8 or more.

The transmission phase of the FSS provided in at least one between the fourth layer and the fifth layer of the laminated member and between the n-3 layer and the n-4 of the laminated member is −53 °. The above is preferable, −50 ° or higher is more preferable, and −47 ° or higher is further preferable.

Further, the transmission phase of the FSS under the same conditions is preferably 23 ° or less, more preferably 20 ° or less, and even more preferably 17 ° or less.

Further, in the FSS loading member according to the present embodiment, between the fourth layer and the fifth layer a of the laminated member and between the n-3 layer and the n-4 layer b of the laminated member. Even when the FSS is provided in both, it is preferable to set it in the preferable range.

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.

[Calculation of FSS transmission phase]
The FSS transmission phase in Examples and Comparative Examples was calculated using finite element method software (High Transparency Simulator (HFSS)) manufactured by Ansys, USA.

[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.

[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 measured and calculated by actual measurement or simulation.

Specifically, for Examples 1, 2, 4, 10, 13, and 14, the reflection characteristics (S11) and the transmission characteristics (S21) were measured by actual measurement as follows. First, 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.

On the other hand, for Examples 3, 5 to 9, 11, 12, 15, 16 and 17, the reflection characteristics (S11) and the transmission characteristics (S21) were measured by the following simulations. That is, the reflection characteristics (S11) and transmission characteristics (S21) 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.

[Manufacturing of FSS loading members]
The FSS loading members or laminated members of Examples 1 to 17 were produced by the following procedure. Examples 1 to 10 correspond to Examples, and Examples 11 to 17 correspond to Comparative Examples. Examples 3, 5, 7, and 8 are virtual samples.

<Example 1>
Cu with a thickness of 10 μm was formed by plating on the entire surface of one main surface of the first dielectric substrate 111 made of soda lime glass having a main surface of 300 mm × 300 mm and a thickness of 1.98 mm, and then etched. A first frequency selection surface F11 having a circular loop slot shape shown in FIG. 3C was formed on the entire surface of the main surface. Further, Cu having a thickness of 10 μm is formed by plating on the entire surfaces of both main surfaces of the second dielectric substrate 113 made of a square having a main surface of 300 mm × 300 mm and a soda lime glass having a thickness of 1.98 mm, and then etching. A second frequency selection surface F12 and a third frequency selection surface F13 having a circular loop slot shape shown in FIG. 3 (C) were formed on the entire surfaces of both main surfaces. The dimensions of each part of the frequency selection surface shown in FIG. 3 (C) are periodic of p: 0.6 mm, t: 0.34 mm, W: 0.23 mm on the first and second frequency selection surfaces F11 and F12. It was a regular hexagonal pattern. Further, on the third frequency selection surface F13, it was a periodic regular hexagonal pattern of p: 0.6 mm, t: 0.34 mm, W: 0.20 mm.

Subsequently, as shown in FIG. 7, a first intermediate 112 and a second intermediate composed of a first dielectric substrate 111, a first frequency selection surface F11, a square having a main surface of 300 mm × 300 mm, and a PVB film having a thickness of 0.76 mm. Examples 1 are obtained by laminating each member in the order of the frequency selection surface F12, the second dielectric substrate 113, and the third frequency selection surface F13, heating at 130 ° C. for 90 minutes under a pressure of 1 MPa, and slowly cooling. The frequency selection surface loading member 110 of the above was manufactured. In the frequency selection surface loading member 110 of Example 1, the non-conductive portion of the first frequency selection surface F11 and the second frequency selection surface F12 is PVB, and the non-conductive portion of the third frequency selection surface F13 is air. 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. In Table 1, S1 and S2 are the areas of the non-conductive portion of the FSS and the conductive portion of the FSS in a plan view, respectively, and "S1 / S2" corresponds to "the area of the non-conductive portion / the area of the conductive portion". In addition, also in Example 2 and later, each FSS was formed on the entire surface of a predetermined main surface in a square having a main surface of 300 mm × 300 mm.

<Example 2>
A 10 μm-thick Cu is formed by plating on both main surfaces of a second dielectric substrate 213 made of soda lime glass having a thickness of 1.98 mm, and then etched to form a circular loop slot shown in FIG. 3 (C). The first frequency selection surface F21 and the second frequency selection surface F22 of the shape were formed. The dimensions of each part of the frequency selection surface shown in FIG. 3C are periodic regular hexagonal patterns of p: 0.59 mm, t: 0.34 mm, W: 0.2 mm on the first frequency selection surface F21. Met. Further, on the second frequency selection surface F22, a periodic regular hexagonal pattern having p: 0.59 mm, t: 0.33 mm, and W: 0.2 mm was obtained.

Subsequently, as shown in FIG. 8, the first dielectric substrate 211 made of soda lime glass having a thickness of 1.98 mm, the first intermediate 212 (PVB film) made of a PVB film having a thickness of 0.76 mm, and the first Example 2 by laminating each member in the order of the frequency selection surface F21, the second dielectric substrate 213, and the second frequency selection surface F22, heating at 130 ° C. for 90 minutes under a pressure of 1 MPa, and slowly cooling. The frequency selection surface loading member 210 of the above was manufactured. In the frequency selective surface loading member 210 of Example 2, the non-conductive portion of the first frequency selective surface F21 is PVB, and the non-conductive portion of the second frequency selective surface F22 is air. 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 3>
First, Cu having a thickness of 10 μm is formed on a PVB film having a thickness of 0.38 mm by plating, and then etched to form the first double-plaid stripes shown in FIG. 3A on the PVB film. The frequency selection surface F31 is formed. The dimensions of each part of the frequency selection surface F31 shown in FIG. 3A are width G: 0.03 mm, L1: 0.2 mm, and L2: 0.24 mm.

Subsequently, as shown in FIG. 9, a first dielectric substrate 311 made of soda lime glass having a thickness of 1.98 mm, a first intermediate 312 made of a PVB film having a thickness of 0.38 mm, and a first frequency selection surface F31. The members are laminated in the order of the second intermediate 313 made of PVB film having a thickness of 0.38 mm and the second dielectric substrate 314 made of soda lime glass having a thickness of 1.98 mm. The frequency-selective surface-loaded member 310 of Example 3 is manufactured by heating at 130 ° C. for 90 minutes under pressure and slowly cooling. In the frequency selective surface loading member 310 of Example 3, the non-conductive portion of the first frequency selective surface F31 is PVB. 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 4>
First, a multilayer film containing Ag and zinc oxide is formed on a PET film having a thickness of 0.1 mm by a sputtering method so that the sheet resistance becomes 2.0 Ω / □, and then a laser having a wavelength of 532 nm is used. Therefore, the double lattice-striped first frequency selection surface F41 shown in FIG. 3A was formed. The dimensions of each part of the frequency selection surface F41 shown in FIG. 3A are width G: 0.038 mm, L1: 0.2 mm, and L2: 0.238 mm.

Subsequently, as shown in FIG. 10, a first dielectric substrate 411 made of soda lime glass having a thickness of 2.04 mm, a first intermediate 412 made of a PVB film having a thickness of 0.38 mm, and a first frequency selection surface F41. , A third intermediate 413 made of PET film with a thickness of 0.1 mm, a second intermediate 414 made of PVB film with a thickness of 0.38 mm, and a second dielectric substrate 415 made of soda lime glass with a thickness of 2.01 mm. The frequency-selective surface-loaded member 410 of Example 4 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. In the frequency selective surface loading member 410 of Example 4, the non-conductive portion of the first frequency selective surface F41 is PVB. 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 5>
First, Cu having a thickness of 10 μm is formed on a PVB film having a thickness of 0.38 mm by plating, and then etched to form the first circular loop slot shape shown in FIG. 3 (C) on the PVB film. The frequency selection surface F51 is formed. The dimensions of each part of the frequency selection surface F51 shown in FIG. 3C 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. 11, a first dielectric substrate 511 made of soda lime glass having a thickness of 1.98 mm, a first intermediate 512 made of a PVB film having a thickness of 0.38 mm, and a first frequency selection surface F51. Each member is laminated so that the second intermediate 513 made of PVB film having a thickness of 0.38 mm and the second dielectric substrate 514 made of soda lime glass having a thickness of 1.98 mm are laminated in this order, and the pressure is 1 MPa. The frequency-selective surface-loaded member 510 of Example 5 is manufactured by heating at 130 ° C. for 90 minutes and slowly cooling. In the frequency selective surface loading member 510 of Example 5, the non-conductive portion of the first frequency selective surface F51 is PVB. 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 6>
First, a multilayer film containing Ag and zinc oxide is formed on a PET film having a thickness of 0.1 mm by a sputtering method so that the sheet resistance becomes 2.0 Ω / □, and then a laser having a wavelength of 532 nm is used. Therefore, the double lattice-striped first frequency selection surface F61 shown in FIG. 3A was formed. The dimensions of each part of the frequency selection surface F61 shown in FIG. 3A are width G: 0.04 mm, L1: 0.18 mm, L2: 0.24 mm.

Subsequently, as shown in FIG. 12, a first dielectric substrate 611 made of soda lime glass having a thickness of 1.80 mm, a first intermediate 612 made of a PVB film having a thickness of 0.38 mm, and a first frequency selection surface F61. , The third intermediate 613 made of PET film with a thickness of 0.1 mm, the second intermediate 614 made of PVB film with a thickness of 0.38 mm, and the second dielectric substrate 615 are laminated in this order. Then, the frequency-selective surface-loaded member 610 of Example 6 was produced by heating at 130 ° C. for 90 minutes under a pressure of 1 MPa and slowly cooling. In the frequency selective surface loading member 610 of Example 6, the non-conductive portion of the first frequency selective surface F61 is PVB. 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 7>
First, Cu having a thickness of 10 μm is formed on a PVB film having a thickness of 0.38 mm by plating, and then etched to form the first double-plaid stripes shown in FIG. 3A on the PVB film. The frequency selection surface F71 is formed. The dimensions of each part of the first frequency selection surface F71 shown in FIG. 3A are width G: 0.06 mm, L1: 0.25 mm, L2: 0.30 mm.

Subsequently, as shown in FIG. 13, a first dielectric substrate 711 made of soda lime glass having a thickness of 2.80 mm, a first intermediate 712 made of a PVB film having a thickness of 0.38 mm, and a first frequency selection surface F71. Each member is laminated in the order of the second intermediate 713 made of PVB film having a thickness of 0.38 mm and the second dielectric substrate 714 made of soda lime glass having a thickness of 2.80 mm, and the pressure is 1 MPa. The frequency-selective surface-loaded member 710 of Example 7 is manufactured by heating at 130 ° C. for 90 minutes and slowly cooling. In the frequency selective surface loading member 710 of Example 7, the non-conductive portion of the first frequency selective surface F71 is PVB. 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 8>
First, Cu having a thickness of 10 μm is formed on a PVB film having a thickness of 0.38 mm by plating, and then etched to form the first double-plaid stripes shown in FIG. 3A on the PVB film. The frequency selection surface F81 is formed. The dimensions of each part of the first frequency selection surface F81 shown in FIG. 3A are width G: 0.03 mm, L1: 0.16 mm, L2: 0.26 mm.

Subsequently, as shown in FIG. 14, a first dielectric substrate 811 made of borosilicate glass having a thickness of 2.00 mm, a first intermediate 812 made of a PVB film having a thickness of 0.38 mm, and a first frequency selection surface F81. Each member is laminated so that the second intermediate 813 made of PVB film having a thickness of 0.38 mm and the second dielectric substrate 814 made of borosilicate glass having a thickness of 2.00 mm are laminated in this order, and the pressure is 1 MPa. The frequency-selective surface-loaded member 810 of Example 8 is manufactured by heating at 130 ° C. for 90 minutes and slowly cooling. In the frequency selective surface loading member 810 of Example 8, the non-conductive portion of the first frequency selective surface F81 is PVB. 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 9>
A multilayer film containing Ag and zinc oxide is formed on one main surface of a second dielectric substrate 913 made of non-alkali glass having a thickness of 1.98 mm by sputtering so that the sheet resistance becomes 1.0 Ω / □. After the film was formed, a first frequency selection surface F91 having a circular loop slot shape shown in FIG. 3C was formed by using a laser having a wavelength of 532 nm. The dimensions of each part of the first frequency selection surface F91 shown in FIG. 3 (C) were a periodic regular hexagonal pattern of p: 0.62 mm, t: 0.42 mm, and W: 0.2 mm.

Subsequently, as shown in FIG. 15, a first dielectric substrate 911 made of non-alkali glass having a thickness of 1.98 mm, a first intermediate 912 made of a PVB film having a thickness of 0.76 mm, and a thickness of 1.98 mm. Example 9 by laminating each member in the order of the second dielectric substrate 913 made of non-alkali glass and the first frequency selection surface F91, heating at 130 ° C. for 90 minutes under a pressure of 1 MPa, and slowly cooling. The frequency-selective surface loading member 910 of the above was manufactured. In the frequency selective surface loading member 910 of Example 9, the non-conductive portion of the first frequency selective surface F91 is air. 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 10>
A multilayer film containing Ag and zinc oxide is formed on one main surface of a second dielectric substrate 1013 made of soda lime glass having a thickness of 2.00 mm by sputtering so that the sheet resistance becomes 1.8 Ω / □. After the film was formed, a laser having a wavelength of 532 nm was used to form the double lattice-striped first frequency selection surface F101 shown in FIG. 3A. The dimensions of each part of the first frequency selection surface F101 shown in FIG. 3A are width G: 0.03 mm, L1: 0.3 mm, L2: 0.32 mm.

Subsequently, as shown in FIG. 16, the thickness 6 so as to surround the periphery of the first dielectric substrate 1011 and the first dielectric substrate 1011 and the second dielectric substrate 1013 made of soda lime glass having a thickness of 2.00 mm. A spacer of .00 mm is provided, a first intermediate body 1012 made of an air layer having a thickness of 6.00 mm, a first frequency selective surface F101, and a second dielectric substrate 1013 made of soda lime glass having a thickness of 2.00 mm. Each member was laminated and fixed so as to be, and the frequency selection surface loading member 1010 of Example 10 was manufactured. In the frequency selective surface loading member 1010 of Example 10, the non-conductive portion of the first frequency selective surface F101 is air. 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.

<Examples 11, 12, 13, 15, 16, 17>
A 0.76 mm thick PVB film as a first intermediate is placed between the first dielectric substrate made of soda lime glass having a thickness of 1.98 mm and the second dielectric substrate made of soda lime glass having a thickness of 1.98 mm. It was inserted and heated at 130 ° C. for 90 minutes under a pressure of 1 MPa and slowly cooled to prepare the laminated member of Example 11. Table 1 shows the relative permittivity, dielectric loss tangent, thickness, and total thickness of the dielectric substrate and the intermediate.

Further, also in Examples 12, 13, 15, 16 and 17, using soda lime glass, non-alkali glass or borosilicate glass for the first dielectric substrate and the second dielectric substrate, the points shown in Table 1 are concrete. Each laminated member was produced in the same manner as in Example 11 except that at least one of the relative permittivity and the thickness of the glass was changed.

<Example 14>
Between the first dielectric substrate made of soda lime glass having a thickness of 2.00 mm and the second dielectric substrate made of soda lime glass having a thickness of 2.00 mm so as to surround the periphery of these dielectric substrates. The laminated member of Example 14 was produced by providing a 6.00 mm spacer and a first intermediate body composed of an air layer having a thickness of 6 mm. 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 radio wave transmission evaluation of the frequency-selective surface-loaded member or laminated member of Examples 1 to 17.

Comparing Example 1 and Example 11, the FSS loading member of Example 1 in which the FSS is arranged at a predetermined position has lower reflection characteristic S11, higher transmission characteristic S21, and radio wave transmission at 78 GHz than Example 11 without FSS. The sex has improved.

Comparing Example 2 and Example 11, the FSS loading member of Example 2 in which the FSS is arranged at a predetermined position has lower reflection characteristic S11, higher transmission characteristic S21, and radio wave transmission at 78 GHz than Example 11 without FSS. The sex has improved.

Comparing Example 3 and Example 11, the FSS loading member of Example 3 in which the FSS is arranged at a predetermined position has lower reflection characteristic S11, higher transmission characteristic S21, and radio wave transmission at 78 GHz than Example 11 without FSS. The sex has improved.

Comparing Example 4 and Example 13, the FSS loading member of Example 4 in which the FSS is arranged at a predetermined position has lower reflection characteristic S11, higher transmission characteristic S21, and radio wave transmission at 28 GHz than Example 13 without FSS. The sex has improved. Further, the FSS loading member of Example 4 had a higher reflection characteristic S11 at 78 GHz but a higher transmission characteristic S21 than that of Example 13.

Comparing Example 5 and Example 11, the FSS loading member of Example 5 in which the FSS is arranged at a predetermined position has lower reflection characteristic S11, higher transmission characteristic S21, and radio wave transmission at 78 GHz than Example 11 without FSS. The sex has improved.

Comparing Example 6 and Example 16, the FSS loading member of Example 6 in which the FSS is arranged at a predetermined position has lower reflection characteristic S11, higher transmission characteristic S21, and radio wave transmission at 78 GHz than Example 16 without FSS. The sex has improved.

Comparing Example 7 and Example 17, the FSS loading member of Example 7 in which the FSS is arranged at a predetermined position has lower reflection characteristic S11, higher transmission characteristic S21, and radio wave transmission at 78 GHz than Example 17 without FSS. The sex has improved.

Comparing Example 8 and Example 15, the FSS loading member of Example 8 in which the FSS is arranged at a predetermined position has lower reflection characteristic S11, higher transmission characteristic S21, and radio wave transmission at 78 GHz than Example 15 without FSS. The sex has improved.

Comparing Example 9 and Example 12, the FSS loading member of Example 9 in which the FSS is arranged at a predetermined position has lower reflection characteristic S11, higher transmission characteristic S21, and radio wave transmission at 78 GHz than Example 12 without FSS. The sex has improved.

Comparing Example 10 and Example 14, the FSS loading member of Example 10 in which the FSS is arranged at a predetermined position has lower reflection characteristic S11, higher transmission characteristic S21, and radio wave transmission at 28 GHz than Example 14 without FSS. The sex has improved.

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 (Japanese Patent Application No. 2020-131975) filed on August 3, 2020, and the content thereof is incorporated as a reference in this application.

10, 40, 50, 60, 110, 210, 310, 410, 510, 610, 710, 810, 910, 1010 Frequency selective

surface loading members

111, 113, 211,213,311,314,411,415,5111 514,611,615,711,714,811,814,911,913,1011,1013 Dielectric Substrate 112,212,312,313,421,413,414,512,513,612,614,6142 713,812,815,912,1012

Intermediates

30a, 30b, 30c, F11, F12, F13, F21, F22, F31, F41, F51, F61, F71, F81, F91, F101

Frequency selection surfaces

31a, 31b, 31c

Conductive parts

32a, 32b, 32c Non-conductive parts

Claims

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 a total thickness of 1.5 mm or more.
The frequency selection surface is provided on at least one of the two outermost surfaces of the laminated member.
The frequency-selective surface-loaded member according to claim 1, wherein the transmission phase of the frequency-selective surface provided on at least one of the two outermost surfaces is −50 ° to + 50 °.
The frequency selection surface is provided at least one between the first layer and the second layer of the laminated member and between the nth layer and the n-1 layer of the laminated member.
The transmission phase of the frequency selection surface provided in at least one between the first layer and the second layer of the laminated member and between the nth layer and the n-1 layer of the laminated member is −30 °. The frequency-selective surface-loaded member according to claim 1 or 2, wherein the frequency is ~ + 30 °.
The frequency selection surface is provided at least one between the second layer and the third layer of the laminated member and between the n-1 layer and the n-2 layer of the laminated member (). However, n is an integer of 4 or more),
The transmission phase of the frequency selection surface provided in at least one between the second layer and the third layer of the laminated member and between the n-1 layer and the n-2 layer of the laminated member is-. The frequency-selective surface-loaded member according to any one of claims 1 to 3, which is 55 ° to + 25 °.
The frequency selection surface is provided on any two or more of the main surfaces of the dielectric layer constituting the laminated member.
The frequency selection surface loading member according to any one of claims 1 to 4, wherein the transmission phase of the frequency selection surface provided on the two or more is −45 ° to + 25 °.
The frequency-selective surface-loaded member according to any one of claims 1 to 5, wherein the relative permittivity of the dielectric layer of the laminated member is 1 or more and 7.2 or less.
The frequency-selective surface-loaded member according to claim 6, wherein the relative permittivity of the dielectric layers of the first layer and the nth layer of the laminated member is 2.3 or more and 7.2 or less.
The frequency selection surface is any one of claims 1 to 7, wherein the non-conductive portions are formed in a double lattice stripe shape in a plan view, and one unit of a quadrangle is regularly arranged in a two-dimensional manner without gaps. The frequency selection surface loading member described in.
The frequency selection surface has a conductive portion formed in a double lattice stripe shape in a plan view, and one unit of a quadrangle is regularly arranged in a two-dimensional manner without gaps, according to any one of claims 1 to 7. The frequency-selective surface loading member described.
The frequency selection surface has a shortest distance L1 between adjacent double grids and a length L2 formed in the double grids of 0.05 mm to 5 mm in a plan view, and the width G of the double grid fringes is large. The frequency selective surface loading member according to claim 8 or 9, which is 0.03 mm to 1 mm.
The frequency selection surface loading member according to any one of claims 1 to 7, wherein a plurality of ring-shaped non-conductive portions are formed on the frequency selection surface in a plan view.
The frequency-selective surface loading member according to claim 11, wherein the plurality of ring-shaped non-conductive portions have the same distance between the centers of adjacent ring-shaped non-conductive portions.
The frequency selection surface loading member according to any one of claims 1 to 12, wherein the sheet resistance of the conductive portion of the frequency selection surface is 50Ω / □ or less.
One of claims 1 to 13, wherein the conductive portion of the frequency selection surface contains 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.
The frequency selection surface loading member according to any one of claims 1 to 14, wherein the non-conductive portion of the frequency selection surface contains at least one selected from PVB, EVA and air.
The frequency selection surface loading member according to any one of claims 1 to 15, wherein the radio wave having the frequency F is included in the range of 1 GHz to 100 GHz.
The frequency selection surface loading member according to any one of claims 1 to 16, wherein the radio wave of the frequency F is vertically polarized wave or horizontally polarized wave incident at an incident angle of 0 ° to 80 °.
The frequency selection surface loading member according to claim 17, wherein the radio wave having the frequency F is vertically polarized wave or horizontally polarized wave incident at an incident angle of 60 ° to 70 °.