Reflector, roll body, method for manufacturing the roll body

Abstract

The present invention aims to provide a reflector that is lightweight, flexible, and has excellent reflective properties, a roll body formed by winding the reflector which is highly portable, and a method for manufacturing the roll body. [Solution] In the first embodiment, the reflector has a dielectric layer, a conductive layer provided on a first surface of the dielectric layer and including a periodic arrangement of a plurality of conductor patterns, and a ground layer provided on a second surface opposite to the first surface, wherein the conductive layer reflects the incident wave at an angle different from the angle of incidence, the dielectric layer has a thickness of 0.5 mm or more and 1.1 mm or less, and is flexible.

Description

Technical Field

[0001] The present invention relates to a reflector, and particularly to a reflector having a metasurface, a roll body obtained by winding the reflector, and a method for manufacturing the roll body.

Background Art

[0002] When radio waves with high frequencies such as microwaves, millimeter waves, and terahertz waves are used for wireless communication, high-speed and large-capacity communication becomes possible. On the other hand, radio waves with high frequencies from 1 GHz to 10 THz have strong directivity, and due to the presence of obstacles between the transmitting antenna and the receiving antenna, there is a drawback that the radio waves cannot reach and communication becomes impossible. In order to improve the communication environment and communication area of mobile communication using high frequencies, a reflector is used. Since a normal reflector has a specular reflection surface where the incident angle and the reflection angle are equal, there is a limit to the reflection range. In order to expand the communication range, a metareflector having a metasurface that reflects an incident wave in a desired direction has been actively developed.

[0003] "Metasurface" means an artificial surface that controls the transmission characteristics and reflection characteristics of incident electromagnetic waves. Metal patterns with a length of about half a wavelength are arranged periodically to control the reflection characteristics and reflect an incident wave in a desired direction. A reflectarray in which array elements are formed in divided regions on a substrate and the gaps between a plurality of patches constituting the array elements are made different for each region has been proposed (for example, see Patent Document 1).

[0004] The above-described reflectarray (hereinafter, also referred to as "reflector") is particularly suitable for improving the communication environment, especially in an indoor environment with many obstacles and dead angles, or in a moving body such as a vehicle.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006] As described above, the larger the reflective surface area of ​​the reflector, the greater the effect on improving the communication environment. When increasing the surface area of ​​the reflector, weight becomes a problem, so it is desirable that it be lightweight while maintaining radio wave reflection characteristics. Therefore, a thin, sheet-like reflector is preferable.

[0007] When the reflector is in sheet form, it is preferable from the viewpoint of mass production that it be manufactured as a roll by roll-to-roll. When installing the reflector, the roll is brought to the installation site and cut to the size of the installation, so improving the portability of the roll is an issue. Specifically, it is preferable that it has the flexibility to be wound up with a small diameter core.

[0008] In one aspect, the present invention aims to provide a reflector that is lightweight, flexible, and has excellent reflective properties, a roll body formed by winding the reflector which is highly portable, and a method for manufacturing the roll body. [Means for solving the problem]

[0009] In the first embodiment, the reflector includes a dielectric layer, a conductive layer provided on a first surface of the dielectric layer and including a periodic arrangement of a plurality of conductor patterns, and a ground layer provided on a second surface opposite to the first surface, wherein the conductive layer reflects the incident wave at an angle different from the angle of incidence, the dielectric layer has a thickness of 0.5 mm or more and 1.1 mm or less, and is flexible.

[0010] In the second embodiment, the reflector, in addition to the configuration of the first embodiment, has a dielectric layer which is a laminate in which at least two or more substrate layers are laminated with an adhesive layer in between. By laminating the substrate layers with an adhesive layer in between, a reflector with excellent flexibility is obtained.

[0011] In the third embodiment, the reflector has the configuration of the second embodiment, plus a ratio B / A of the total thickness B of the adhesive layer to the total thickness A of the substrate layer, which is 1.0 or less. Within this numerical range, a reflector with better rollability can be obtained while maintaining the reflectivity of the reflector.

[0012] In the fourth embodiment, the reflector has the configuration of the first embodiment plus the dielectric layer having a relative permittivity of 2.0 or more and 4.0 or less. When the dielectric layer has such a relative permittivity, even when the reflector is miniaturized and designed to reduce the distance between conductor patterns, noise generation due to signal interference between patterns can be reduced.

[0013] In the fifth embodiment, the reflector has the same configuration as the first embodiment, but the thickness of the conductor layer and the thickness of the ground layer are both 3 μm or less. By configuring the thickness in this way, a reflector with better rollability can be obtained while maintaining the reflectivity characteristics of the reflector.

[0014] In the sixth embodiment, the reflector has, in addition to the configuration of the first embodiment, an adhesive layer provided on the side of the ground layer opposite to the dielectric layer. The adhesive layer allows the reflector to be attached to a desired location, such as a wall or ceiling. Furthermore, because the reflector is flexible, it can conform to the shape of the surface to which it is attached.

[0015] In the seventh embodiment, the reflector has, in addition to the configuration of the first embodiment, a protective layer provided on the side of the conductor layer opposite to the dielectric layer. The protective layer protects the conductor layer of the reflector from deterioration and damage due to external factors, resulting in excellent durability.

[0016] In the eighth embodiment, the reflector is a reflector having a length in the width direction and a length in the longitudinal direction perpendicular to the width direction, in addition to the configuration of any one of the first to seventh embodiments, and the length in the longitudinal direction is 5 m or more. If the length in the longitudinal direction of the reflector is 5 m or more, an excellent communication environment can be provided even when the user uses the communication device while moving in the vicinity of the reflector construction site.

[0017] The ninth embodiment is a roll body of a reflector having the configuration of any one of the first to seventh embodiments. By making the reflector a roll body, it has excellent mass productivity during manufacturing and excellent portability when constructing a large area.

[0018] In the tenth embodiment, the roll body has an inner diameter of 160 mm or less in addition to the configuration of the ninth embodiment. When the inner diameter of the roll body is 160 mm or less, a roll body with more excellent portability is provided.

[0019] The eleventh embodiment is a manufacturing method of the roll body of the ninth embodiment.

Advantages of the Invention

[0020] With the above configuration, a reflector that is lightweight, has flexibility, and has excellent reflection characteristics is realized.

Brief Description of the Drawings

[0021] [Figure 1] It is a diagram showing the basic configuration of the reflector of the first embodiment. [Figure 2] It is a diagram showing an example of a design method of a conductor pattern. [Figure 3] (A) It is a diagram showing the arrangement of the conductor pattern constituting the conductive layer of the reflector of the first embodiment. (B) It is a diagram showing the size and phase of the conductor pattern of the reflector of the first embodiment. [Figure 4] It is a diagram showing the reflection characteristics of the reflector designed according to FIG. 3. [[ID=3,8]] [Figure 5A] It is a diagram showing the configurations and characteristics of the examples and comparative examples. [Figure 5B] It is a diagram showing the configurations and characteristics of the examples and comparative examples.

Embodiments for Carrying Out the Invention

[0022] FIG. 1 is a basic configuration diagram of the reflector 10 of the first embodiment. The reflector 10 includes a dielectric layer 11, a conductive layer 13 provided on the first surface 111 of the dielectric layer 11, and a ground layer 12 provided on the second surface 112 opposite to the first surface 111 of the dielectric layer 11. The conductive layer 13 includes a periodic arrangement of a plurality of conductor patterns 131 and functions as a reflection surface of the reflector 10. This reflection surface is a metasurface that reflects an incident wave at an angle (absolute value) different from the incident angle. The ground layer 12 forms a capacitance between the ground layer 12 and each conductor pattern 131, and the magnitude of the phase delay can be controlled for each conductor pattern 131.

[0023] The dielectric layer 11 has at least one base material layer and has flexibility. In this specification, "having flexibility" means that when manufacturing the reflector as a roll body, it can be wound around a mandrel (also called a core) with a diameter of 160 mm. Also, in this specification, "can be wound around a core" means that when wound around a core having a predetermined diameter and then unfolded into a sheet shape, no bending, damage, breakage, etc. can be visually confirmed.

[0024] In the conductive layer 13, conductor patterns 131 of different sizes are arranged at a predetermined pitch. The size and pitch of the conductor patterns 131 are set according to the required reflection characteristics. Each of the conductor patterns 131 has a size sufficiently smaller than the wavelength of use and selectively reflects radio waves in the target frequency band. The phase of reflection is controlled by the conductor patterns 131, and the reflected waves are superimposed to form a reflected beam BM in a desired direction.

[0025] Let λ be the wavelength of the incident radio wave, d be the pitch of the conductor pattern 131, i.e., the distance between the centers of adjacent conductor patterns 131, δ1 and δ2 be the phases of the radio waves reflected by two adjacent conductor patterns 131, respectively, and θ be the angle of reflection. The phase difference δ1-δ2 is expressed by equation (1). δ1-δ2=(2π / λ)d·sinθ+2nπ (1) Here, n is an integer.

[0026] To reflect radio waves in a desired direction using the reflector 10, δ1, δ2, and d should be designed so that the desired reflection angle θ is obtained. The reflection angle θ is set to a desired angle between the normal direction (0°) and the horizontal direction (90°) of the reflecting surface of the reflector 10, excluding 0° and 90°. The values ​​of δ1 and δ2, which represent the reflection phase, can be controlled and changed by design parameters such as the wavelength λ of the incident radio wave, the size (length × width) and pitch of the conductor pattern 131, and the thickness and relative permittivity of the reflector 10. For example, when designing the length L of the conductor pattern 131 to obtain a desired phase difference, the conductor pattern 131 may be designed by creating a length / phase characteristic graph as shown in Figure 2. The length / phase characteristic in Figure 2 is obtained by measuring the radio wave reflection pattern while changing the length L of the conductor pattern, while keeping the design parameters other than the length L (mm) fixed, and analyzing it using 3D electromagnetic field simulation software. Figure 2 is an example design with a relative permittivity ε = 3.7.

[0027] The relative permittivity of the dielectric layer 11 is not particularly limited, but is, for example, 2.0 to 4.0. By setting the relative permittivity to 2.0 to 4.0, even when the reflector is miniaturized and designed to reduce the distance between conductor patterns, noise generation due to signal interference between patterns can be reduced.

[0028] Examples of the substrate forming the dielectric layer 11 include polymer materials. Examples of polymer materials include resins. Examples of resins include polyester resins, olefin resins, acrylic resins, polycarbonate resins, polyethersulfone resins, polyarylate resins, melamine resins, polyamide resins, polyimide resins, cellulose resins, and polystyrene resins. Examples of polyester resins include polyethylene terephthalate (PET), polybutylene terephthalate, and polyethylene aphthalate. Examples of olefin resins include polyethylene, polypropylene, and cycloolefin polymer (COP). Preferably, from the viewpoint of transparency, flexibility, and mechanical properties, PET and COP are used as resins.

[0029] The dielectric layer may be a laminate in which layers of substrates (hereinafter also referred to as substrate layers) are stacked via an adhesive layer, as described later.

[0030] The adhesive layer is, for example, a layer containing an adhesive that adheres two substrate layers together. The adhesive used in the adhesive layer is not limited. Examples of materials for the adhesive layer include acrylic adhesive compositions, silicone adhesive compositions, urethane adhesive compositions, and, for example, rubber adhesive compositions. Preferably, from the viewpoint of dielectric constant, transparency, and durability, an acrylic adhesive composition is used. The dielectric constant of the acrylic adhesive composition is, for example, about ε = 2.7.

[0031] When forming an adhesive layer on a substrate layer, the adhesive may be applied to the substrate layer, or a release liner with the adhesive pre-applied may be prepared, and the adhesive may be transferred from the release liner to the substrate layer.

[0032] By laminating the base layer via an adhesive layer, a reflector with excellent flexibility can be obtained. This advantage is particularly pronounced when the thickness of the dielectric layer is increased. Although the reason is not entirely clear, it is thought that when the reflector is wound, the adhesive layer, which is more flexible than the base layer, absorbs the internal stress generated in the dielectric layer, thereby mitigating damage to the dielectric layer.

[0033] In this specification, "thickness of the adhesive layer" refers to the thickness of the adhesive layer after the reflector has been fabricated. When the dielectric layer is cut in the thickness direction and the laminated surface is observed in cross-section with a microscope, the average distance between any five points between the substrates is defined as the thickness of the adhesive layer.

[0034] When the dielectric layer has a relative permittivity of 2.0 to 4.0, the effects of interference between circuits are reduced when designing a compact reflector, and a reflector with excellent reflection characteristics is provided. Examples of materials that form a dielectric layer with a relative permittivity of about ε = 3.1 include PET. Examples of materials with a relative permittivity of about ε = 3.6 include polyphenylene ether (PPE) and acrylic resin. Examples of materials with a relative permittivity of about ε = 2.1 include polytetrafluoroethylene (PTFE).

[0035] The conductive layer and the ground layer are not particularly limited as long as they are made of conductive material, but copper is preferred from the viewpoint of conductivity, processability, and cost. The thickness of the conductive layer and the ground layer is not particularly limited, but from the viewpoint of cost, it is preferably 1 mm or less, from the viewpoint of rollability, preferably 10 μm or less, and more preferably 3.0 μm or less. Methods for forming conductive layers of such thickness include rolling, field deposition, and sputtering.

[0036] Methods for forming conductive patterns on a conductive layer include, for example, laser processing, etching using a mask of the desired pattern, and sputtering.

[0037] Preferably, an adhesive layer is formed on the side of the ground layer opposite the dielectric layer. The adhesive layer allows the reflector to be attached to a desired location, such as a wall or ceiling. Examples of materials for the adhesive layer include acrylic adhesive compositions, silicone adhesive compositions, urethane adhesive compositions, and, for example, rubber adhesive compositions.

[0038] A protective layer may be provided to cover the conductive layer. The protective layer is preferably transparent to incident waves in the 24 GHz to 30 GHz range. Transparency to incident waves means having a transmittance of 60% or more, preferably 70% or more, more preferably 80% or more, and even more preferably 90% or more, relative to the incident wave. The protective layer may also be transparent to visible light. By providing a protective layer, the reflector can be attached to outdoor bulletin boards or building walls. The board with the reflector attached may also be suspended at a desired position.

[0039] The protective layer protects the reflector's conductor pattern from deterioration and damage caused by external factors, resulting in excellent durability. While the reflector's conductor pattern is susceptible to oxidative degradation over time due to contact with oxygen and moisture in the atmosphere, the formation of a protective layer is preferable from a weather resistance standpoint, especially when used outdoors. Similarly, even indoors, the formation of a protective layer is preferable if the installation environment is prone to condensation. The protective layer preferably has a thickness of 0.1 mm or more and 1.0 mm or less, and a relative permittivity of 2.0 or less. By configuring the protective layer in this way, a reflector can be obtained that achieves both high durability and high transparency to incident waves in the 24 GHz to 30 GHz range.

[0040] Figure 3 shows a design example of the reflector 10 of the first embodiment. Figure 3(A) shows the arrangement of the conductor patterns 131a to 131g that constitute the conductive layer 13. Figure 3(B) shows the size and phase of each conductor pattern. The conductor patterns 131a to 131g are cross patterns with equal vertical and horizontal lengths. The size of each conductor pattern 131 is indicated by its vertical or horizontal length using pattern numbers L1 to L7. The pitch of the conductor patterns 131a to 131g, i.e., the distance d between centers, is set to 1 / 2 of the wavelength λ used (i.e., 0.5λ). Since the wavelength λ in the 28GHz band is 10.8mm, the pitch of the conductor patterns 131a to 131g is 5.4mm.

[0041] The arrangement of conductor patterns 131a to 131g aims for a reflection angle of 35°. In this case, the reflection angle is the reflection angle when radio waves are incident perpendicularly to the reflector 10, i.e., the reflection angle relative to the normal. Based on equation (1) above, the phase difference "δ1-δ2" when θ is 35° is found to be 103°. The size of conductor patterns 131a to 131g, i.e., the length of pattern numbers L1 to L7, is determined so that this phase difference is obtained.

[0042] The shape of the conductor pattern 131 is not limited to a cross pattern; different sizes of circles, ellipses, polygons, etc., may be provided at a predetermined period. The size of the conductor pattern 131 is 2-5 mm when targeting the 28 GHz band, but the size of the conductor pattern 131 is designed appropriately depending on the frequency band. Radio waves of frequencies determined by the size and period of the conductor pattern 131 are selectively reflected.

[0043] Figure 4 shows the reflection characteristics of the reflector 10 designed in Figure 3. The relative permittivity of the dielectric layer 11 of the reflector 10 is 3.7. The horizontal axis represents angle, and the vertical axis represents reflection intensity (dB). A main peak is observed in the 35° direction, confirming that the reflector 10 is able to control the direction of radio wave reflection almost as designed. [Examples]

[0044] For the reflectors of Examples 1 to 9 and Comparative Examples 1 and 2 of the present invention, the reflectors were designed to have the dielectric layer configuration, substrate layer thickness, number of substrate layers, total substrate layer thickness A, total adhesive layer thickness B, total dielectric layer thickness A + B layers, B / A, relative permittivity ε of the dielectric layer, conductive layer thickness, and ground layer thickness shown in Figure 5A. In all cases, the substrate layer was made of PET, and the adhesive layer was made of an acrylic adhesive composition. Furthermore, all reflectors were designed so that other conditions, such as the conductor pattern size, were the same as those of the reflector in Figure 3.

[0045] The communication characteristics and rollability of the reflectors in Examples 1-9 and Comparative Examples 1 and 2 were evaluated using the following procedure.

[0046] Regarding the reflectance intensity of the reflector, the layer configuration of the dielectric layer was varied as shown in Figure 5A, while the relative permittivity of the dielectric layer was fixed at ε=3.1, and the 28GHz reflection spectrum was calculated. The reflection intensity on the vertical axis is shown as the scattering cross section (RCS), which is an index representing the reflectivity. A plane wave in the 28GHz frequency band was incident from the normal direction of the reflector, and the peak intensity of the main lobe at a reflection angle of 35° was analyzed using Dassault Systèmes CST Studio Suite, a general-purpose 3D electromagnetic field simulation software.

[0047] [Simulation of communication characteristics] The intensity of the reflected spectrum for the incident wave was determined by performing a simulation under the following conditions. • Wavelength of incident wave: 10.7 mm (frequency 28 GHz) • Frequency variation range of the incident wave: 20 GHz to 35 GHz • Incident angle of the incident wave relative to the normal direction of the reflector: 0 degrees • The first desired reflection angle θ of the reflection spectrum with respect to the normal direction of the reflector: 35 degrees • Number of conductor patterns: 7 (arranged in series) • Conductor pattern pitch: 5.4mm (0.5λ)

[0048] [Communication Characteristics Evaluation] For each example and comparative example, the loss (in dB) relative to the peak intensity of the main lobe in the 35° direction will be analyzed for the reflector. The following criteria are used to evaluate the "communication characteristics" for the loss in Example 1 (dielectric layer: PET single layer). ○: The loss is small, and the communication status is judged to be exceptionally good. △: The loss is moderate, and good communication is deemed possible. ×: Significant loss indicates poor communication conditions.

[0049] Winding tests were performed on the reflectors of each example and comparative example under the following conditions, and the flexibility of the roll body was evaluated as "rollability" based on two points: "appearance" and "roll retention".

[0050] [Wrap test] 1. The reflector was fabricated as a roll with a width of 500 mm and a length of 5 m in the longitudinal direction perpendicular to the width, and then cut out as a test piece with four sides of 300 mm x 300 mm. 2. Fix one end of the test specimen (fixed end) to a core with a diameter of 160 mm, wrap it around so that there are no gaps, and fix the furthest side of the remaining three sides of the test specimen (free end) from the fixed end to the core, and leave it undisturbed in that state for 1 hour. 3. We confirmed whether the rolled form of the test specimen was maintained with the free end detached from the core. We also re-unfolded the reflector into a sheet and visually inspected its appearance. The appearance was evaluated based on the following factors. Have any cracks or scratches occurred? Have wrinkles or distortions occurred throughout the entire surface?

[0051] [Evaluation of role-playing ability] • ○: The rolled material remains intact, or can be rolled up but returns to its original sheet form when unrolled. Furthermore, there are no visible defects. • ×: Cannot be rolled, or will result in a significant defect in appearance.

[0052] [comprehensive evaluation] The reflectors of Examples 1-9 and Comparative Examples 1 and 2 were comprehensively evaluated according to the following criteria. • ○: Communication characteristics are rated ○ or △, and role-playing ability is rated ○ • ×: Either the evaluation of communication characteristics or role-playing ability is incorrect.

[0053] <Thickness of the dielectric layer> Let's examine the thickness of the dielectric layer 11. As shown in Figure 5B for Examples 1-9 and Comparative Example 1, it can be seen that a reflector with good communication characteristics can be obtained if the total thickness (A+B) of the dielectric layer 11 is 0.5 mm or more. In particular, compared to Example 9, it was found that exceptionally good communication characteristics can be obtained when the B / A ratio is 1.0 or less, as in Examples 1-8 and Comparative Example 1. On the other hand, it was found that the communication characteristics are poor when the total thickness (A+B) of the dielectric layer 11 is 0.1 mm, as in Comparative Example 2. On the other hand, when the total thickness (A+B) of the dielectric layer 11 is 1.5 mm, as in Comparative Example 1, exceptionally good communication characteristics are obtained, but it was found that the rollability is not satisfied.

[0054] [Method for manufacturing long rolled bodies] As shown in Figure 1, the reflector 10 is provided with a conductive layer 13, a dielectric layer 11, and a ground layer 12 in order toward one side in the thickness direction of the reflector 10. Although not shown in Figure 1, in Examples 2 to 9 and Comparative Example 1, the dielectric layer 11 is a laminate in which a substrate layer is laminated with an adhesive layer in between. In Figure 5A, the numbers in the column "Layer configuration of dielectric layer" represent the thickness of each layer (unit: μm). For example, "Substrate 500" in Example 1 means that the thickness of the substrate layer is 500 μm (= 0.5 mm). Also, the layer configuration separated by a slash symbol means that each layer is laminated in the thickness direction of the reflector in the order listed.

[0055] The method for manufacturing the reflector 10 comprises, for example, a first step (fabrication of a dielectric layer), a second step (fabrication of a conductive layer and a ground layer), and a third step (formation of a conductor pattern). In this embodiment, the first step is carried out by a roll-to-roll method.

[0056] [1st step] In the first step, the dielectric layer 11 is prepared. For example, a long dielectric material (500 mm wide, 5 m long) is prepared as a roll 7. If the dielectric layer is a laminate, an adhesive is placed between the substrate layers as an adhesive layer. For example, a layer of adhesive formed on a release liner is transferred to one side of the substrate layer. Then, the release liner is peeled off, and the other substrate layer is bonded to the adhesive that has been transferred and exposed on the surface of the substrate layer and dried. Alternatively, instead of using the transfer method, a varnish of the adhesive composition may be applied to one side of the substrate layer.

[0057] [Second process] In the second step, a conductive layer and a ground layer are formed on one and the other surface of the dielectric layer in the thickness direction, respectively. For example, copper can be used as the conductive layer and the ground layer. Examples of methods for forming the conductive layer and the ground layer include hot pressing, field deposition, and sputtering. From the viewpoint of thinning, sputtering is preferred. An example of a sputtering method is magnetron sputtering.

[0058] [3rd step] In the third step, the conductive layer is patterned as a conductive pattern. A conductive pattern with the desired reflection characteristics is obtained by simulation. The method for forming the desired conductive pattern on the conductive layer is not limited, but one example is to cover the dielectric layer with a mask on which the conductive pattern has been formed and then form the pattern by sputtering.

[0059] [Formation of roll bodies] The third step yields a reflector comprising a conductive layer with a conductive pattern, a dielectric layer, and a ground layer. One end (fixed end) of this reflector is fixed to the roll core of a roll machine, and it is wound around the core without creating any gaps, thereby forming a roll body 7. The diameter of the core is not limited. In particular, a core diameter of 160 mm or less is preferable because it suppresses the increase in the diameter of the roll body when the reflector is lengthened. Such a small-diameter roll body offers excellent portability in narrow construction locations such as indoors or inside mobile units.

[0060] As shown in the above examples and comparative examples, if a reflector has a dielectric layer, a conductive layer provided on the first surface of the dielectric layer and including a periodic arrangement of a plurality of conductor patterns, and a ground layer provided on the second surface opposite to the first surface, wherein the conductive layer reflects incident waves at an angle different from the angle of incidence, the dielectric layer has a thickness of 0.5 mm or more and 1.1 mm or less, and is flexible, then a reflector with excellent portability when formed into a roll can be obtained while maintaining excellent radio wave reflection characteristics, as well as the roll body thereof. Furthermore, the present invention provides an excellent method for manufacturing the reflector and its roll body. [Explanation of symbols]

[0061] 10 reflectors 11 Dielectric layer 111 1st surface 112 2nd surface 12 Ground Layer 13. Conductive layer 131 Conductor Pattern

Claims

1. Dielectric layer and A conductive layer is provided on the first surface of the dielectric layer and includes a periodic arrangement of a plurality of conductor patterns, A ground layer provided on the second surface opposite to the first surface, It has, The conductive layer reflects the incident wave at an angle different from the angle of incidence. The thickness of the dielectric layer is 0.5 mm or more and 1.1 mm or less. Having flexibility, Reflector.

2. The dielectric layer is a laminate in which at least two or more substrate layers are stacked with an adhesive layer in between. The reflector according to claim 1.

3. The ratio B / A of the total thickness B of the adhesive layer to the total thickness A of the base layer is 1.0 or less. The reflector according to claim 2.

4. The reflector according to claim 1, wherein the dielectric layer has a relative permittivity of 2.0 or more and 4.0 or less.

5. The reflector according to claim 1, wherein the thickness of the conductive layer and the thickness of the ground layer are each 3 μm or less.

6. An adhesive layer provided on the side of the ground layer opposite to the dielectric layer, A reflector according to claim 1, having the following features.

7. A protective layer provided on the side of the conductive layer opposite to the dielectric layer, A reflector according to claim 1, having the following features.

8. A reflector having a length in the width direction and a length in the longitudinal direction perpendicular to the width direction, wherein the length in the longitudinal direction is 5 m or more, according to any one of claims 1 to 7.

9. A roll body on which the reflector according to any one of claims 1 to 7 is wound.

10. The roll body according to claim 9, wherein the inner diameter is 160 mm or less.

11. A method for manufacturing a roll body according to claim 9.

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