JP2002171120A - Radio-wave convergent structure and antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna device, the cost of which is reduced and is well applicable to a conventional method or the like, has durability without being affected by wind and snow and does not damage the appearance of a building, and to provide a structure used for it. SOLUTION: A radio-wave convergent pattern formed by-removing a thin-film composed of a metal or the like having the transparency of a mass-produced infrared-ray reflecting glass plate, the structure with a region having an infrared- ray reflecting function so as to surround the patter and the antenna device using the structure are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent structure having a radio wave convergence function and a heat ray reflection function,
In particular, the present invention relates to a transparent structure having a function of converging radio waves in the microwave and millimeter wave regions used for communication and broadcasting, and an antenna device using the same.

[0002]

2. Description of the Related Art Heretofore, a so-called parabolic antenna for converging radio waves to a focal point by a reflector such as a parabolic surface has been known as a communication antenna or a broadcasting antenna. The installation method is to install a pillar of sufficient thickness on the outside of a building such as a building, for example, on the roof, so that sufficient strength can be obtained in consideration of the antenna's own weight, wind and snow, and a reflecting mirror there. And the like. Such an antenna device is required to be durable so that the antenna and the support are not rusted because they are exposed to rainwater. However, the antenna device is aging quickly and needs to be maintained. Further, since the parabolic antenna is installed so as to protrude outside, there is a problem that the appearance of the entire building such as a building is impaired.

[0003] Therefore, it is conceivable to install a parabolic antenna or the like indoors, or to install a lens or a diffraction grating for converging the radio wave at the opening of a building to converge the radio wave and increase the energy density for reception. JP-A-11-15
No. 0416 (Antenna: Deutsche Telekom AG) proposes an antenna in which a structure for diffracting electromagnetic signals in the microwave and millimeter wave regions is attached instead of a window or integrally with a window or a part thereof. .
The publication describes mounting a visually transparent diffractive structure, for example in the form of a Fresnel lens, of appropriate dimensions, and mounting or integrating a Fresnel-like zone plate on a window. I have. However, this publication does not describe the specific shape of the diffraction structure, but merely describes the idea.

Japanese Patent Application Laid-Open No. 4-134909 discloses a diffraction ring formed of a transparent conductive thin film having high transparency on a window glass, and a pickup antenna for reception arranged at a substantially focal position of the diffraction ring. Are disclosed. It is described that this diffraction ring is made of a transparent conductive material and transmits light, so there is no danger of blocking sunlight or a sense of strangeness when mounted on a window glass etc. Since the function as a window glass has not been studied in the part where it is not present, the heat ray reflection function required for the window glass is inferior, the heat of indoor heating is wasted to outside air, and the indoor temperature rises due to the heat of the sun in summer. There are drawbacks such as too much. In addition, the conventional glass sheet manufacturing equipment cannot be used as it is, so that there is a problem that the cost increases.

On the other hand, as window glass, a metal or the like having transparency on the surface of a glass plate (hereinafter, in the present invention, any of metals, metal oxides, metal nitrides, their inclusions, or any mixture thereof) Is also commercially available, and is used for buildings such as buildings. This heat ray reflective glass plate appropriately balances the transmission and reflection of visible light, blocks the inflow of solar radiation into the room, improves the indoor environment to moderate the local temperature rise and glare near the window, improves the indoor environment, and moderates the solar radiation There is a feature that it can shut off and reduce the cooling load. Further, similarly, an electromagnetic shielding glass plate on which a thin film of metal or the like is formed is known, and this electromagnetic shielding glass plate is used as a glass plate having a function of protecting electronic devices from electromagnetic waves and preventing leakage of electromagnetic waves.

However, in a window room using a glass plate on which such a thin film of metal or the like is formed, a radio wave is attenuated by the thin film, so that even if the receiver is installed indoors, it is not possible to receive a signal well.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and relates to an antenna device, particularly a structure used for an antenna device in the microwave and millimeter wave regions used for communication and broadcasting. I will provide a. INDUSTRIAL APPLICABILITY The present invention has a high directivity gain, can be installed indoors, does not require special structures outside, can use the existing glass sheet manufacturing process as it is, and has a function of converging radio waves and a heat ray as a window glass sheet. A structure having a reflection function is also provided.

[0008]

That is, the present invention provides the following inventions. (1) A pattern formed of a transparent thin film provided on a substrate having transparency, a radio wave convergence pattern for converging radio waves, and a region having a heat ray reflection function provided so as to surround the radio wave convergence pattern. The radio wave convergence structure characterized by being provided. (2) An antenna device comprising: the radio wave convergence structure according to (1); and a transmission unit and / or a reception unit arranged at a position where radio waves are converged by the radio wave convergence structure.

(3) A structure having the radio wave convergence function at the innermost periphery surrounding the radio wave convergence pattern in the area having the heat ray reflection function of the above (1). (4) The structure or the antenna device according to any one of (1) to (3), wherein the base is a window glass plate.

(5) The structure or the antenna device according to any one of (1) to (4), wherein the radio wave convergence pattern is a region where a part of a thin film such as a metal of the heat ray reflection glass plate is removed. (6) The structure or the antenna device according to any one of (1) to (5), wherein the radio wave convergence pattern is a Fresnel zone plate. (7) In any one of the above (1) to (6), the radio wave converged is a microwave or a millimeter wave radio wave. Here, the microwave refers to a radio wave having a frequency of about 1 GHz to 3 THz, and the millimeter wave refers to a radio wave of about 30 GHz to 30 THz.
A radio wave having a frequency of 0 GHz. Millimeter waves form part of the microwave band.

(8) In this specification, the above (1) to (5)
The structure or the antenna device according to any one of (7) mainly describes a function of receiving a radio wave.
By utilizing the reversibility of transmission / reception of radio waves, the radio wave transmitted from the transmission unit and / or the reception unit is deflected by using the structure of the present invention into a plane wave, and may be used as an antenna device for transmitting a radio wave in a predetermined direction. Good.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below, but the present invention is not limited to the specific examples described here. The present invention is a structure having a pattern formed of a transparent thin film on a visually transparent substrate surface, and the pattern is arranged so as to surround a radio wave converging pattern. There is an area having a heat ray reflection function.

Specific examples of the substrate include a glass plate, a film such as plastic, or a plate. The shape and use of the substrate are not particularly limited. For example, 1) a window glass plate made of a soda lime glass plate, a frost glass plate or the like; 2) a window glass plate for a vehicle such as an automobile;
Any of 3) a plastic film such as PET and 4) a plastic plate made of an acrylic resin or the like may be used.

The substrate may be a single layer or a plurality of layers. For example, the substrate may be a multi-layer glass plate in which a plurality of glass plates are arranged with a space therebetween, or a plurality of glass plates may be formed of resin. It may be a laminated glass plate which is laminated through the like. The pattern formed of the transparent thin film of the present invention is a pattern in which a transparent pattern described later is formed on the above-described substrate surface, and may be formed on any surface of the substrate, and may be formed on a plurality of surfaces. It may be formed.
Further, a part of the pattern may be formed on one surface and another part of the pattern may be formed on another surface. Preferably, when forming the antenna device, the structure of the present invention is provided on a surface of the glass plate serving as the substrate on the indoor side (the side on which the transmitting unit and / or the receiving unit are arranged).

The radio wave convergence pattern in the present invention may have any structure as long as it is configured to converge and diffract radio waves, increase energy density, or deflect radio waves. Hereinafter, as an example, the configuration of a plane diffraction ring, particularly the configuration of a Fresnel zone plate will be described. However, the radio wave convergence pattern in the present invention is not limited to these configurations. The thickness may be changed stepwise to correct the phase difference to converge the radio wave, or a dipole or the like may be adjusted and arranged for each zone to perform phase correction to converge the radio wave. The method of changing the radio wave convergence pattern in the present invention in a stepwise manner in the thickness direction of the glass plate may be a method in which the thickness direction of the glass plate is changed stepwise by a plurality of etchings, or using a grindstone or the like. May be configured by cutting a glass plate.
There is no particular limitation.

The Fresnel zone plate is also simply referred to as a zone plate or a Fresnel (ring) strip (for example, Riki Ogawa and Morika Wakagi, Introduction to Optical Engineering, Jikkyo Shuppan). As shown in FIG. and a radio wave (light) transmission point a, the reception point is B, point C on the way, when considering the plane S, the radius r _1, r ₂ around the C on the plane S, the concentric circles ... r _m draw point c ₁ on its periphery, c _2, ... c _m and the distance each lambda / 2 between the point B, lambda, ... Taking the m [lambda / 2 as long made such radius r, flanked by the concentric circles The electric field due to the annular region, which is a closed zone, has a path difference of λ
/ 2, the signs appear alternately, and if the annular part formed by a plurality of concentric circles is alternately made the transmission and non-transmission part of the radio wave, the radio wave of the wavelength λ transmitted from the transmission point A The light is diffracted on the plane S at the point and converges on the receiving point B.

Therefore, such a pattern in which an annular portion surrounded by a plurality of concentric circles is alternately formed as a radio wave transmitting portion and a radio wave non-transmitting portion has a convergence having positive and negative focal lengths with respect to a wavelength λ radio wave. It can be used as an element. FIG. 3 shows one such pattern of the Fresnel zone.
Here is an example. The example of FIG. 3 shows a Fresnel zone pattern formed on the same plane of a transparent substrate, and a plurality of annular portions are alternately formed as a radio wave transmitting portion and a non-transmitting portion. The groups of ellipses need not be formed on the same plane, and may be formed on different planes.

The radius r _m of the m-th zone is d ₁ , d ₂
Is the distance from A, B to C shown in FIG.

(Equation 1) Here, m = 1, 2, 3,... M. That is, it is a plurality of annular patterns having a radius proportional to the square root of the product of the number m of concentric circles counted from the center and the wavelength λ. This r ₁ , r
_2, ... r, respectively the first Fresnel zone a zone adjacent to the inside of _m, is called a second Fresnel zone, another transparent to radio waves, to form a impermeable pattern.

The shape of the pattern of the Fresnel zone is designed according to the conditions of use. The above description is based on the case where the radio wave is perpendicularly incident on the plane S, and the radio wave is transmitted and opaque. The part is a ring group formed by forming a plurality of rings continuously and alternately. If the radio wave has a slope with respect to the plane S, it is a group of ellipses. In particular, when the incoming radio wave has an elevation angle, on the plane S, a group of ellipses having a long axis in a direction perpendicular to the AB direction and a short axis in a direction perpendicular to the long axis is transmitted and impermeable to the radio wave. The portions are formed continuously and alternately in a plurality of elliptical rings. The radio wave convergence pattern designed in this way reflects a radio wave in a region having a thin film of a metal or the like, and transmits a radio wave in a region of a glass plate surface where the thin film of a metal or the like is not formed, and focuses on the focal point. The wavelength of the radio wave may be, for example, one specific wavelength such as λ or a wavelength having a bandwidth.

Among the patterns provided on the structure of the present invention, a region having a heat ray reflection function provided so as to surround the above-described radio wave convergence pattern may have an electromagnetic shielding function, and may be a transparent metal or the like. It is formed of a thin film.

As the thin film of a metal or the like, a metal, a metal oxide, or a metal nitride may be used alone, or a plurality thereof may be included, or a transparent thin film composed of a mixture of a metal and a metal oxide may be used. For example, as a conductive film having heat ray reflectivity, an indium oxide conductive film formed by a sputtering method, an ITO (tin-containing indium oxide) film, ATO
There is known a heat ray reflective glass plate provided with an undercoat for improving the adhesion between the (antimony-containing tin oxide) film and the glass plate and an overcoat as a protective layer.
In addition, a thin film of metal or the like may be formed on the surface for the purpose of electromagnetic shielding.

The thin film of a metal or the like having a heat ray reflection function and / or an electromagnetic shielding function is, for example, a transparent tin oxide conductive film, or Cr, Ti, Ag, Au, Al,
In addition to a single-layered conductive film such as a transparent metal conductive film such as Cu and Ni, a metal nitride, a metal oxide, or a composite thereof may be used, and TiO ₂ / Ag / TiO ₂ , ZnO / Ag
A transparent metal conductive film having a multilayer structure in which a conductive metal thin film such as / ZnO, ZnO / Ag / ZnO / Ag / ZnO, etc. is laminated in a sandwich manner from above and below with a transparent dielectric layer can also be used.

The region having the heat ray reflection function preferably has low conductivity. In a state where the heat ray reflective film or the plurality of films are formed on one surface of the glass plate, the glass plate preferably has a visible light transmittance of 5 to 90% and a solar transmittance of 5 to 90%.

For example, a Low-E glass plate (Low E
Missibility Glass), as a heat ray reflective glass plate, an electromagnetic shielding glass plate, or an electrothermal glass plate,
A functional glass plate using a layered structure film including a layer containing silver as a main component as a selective optical reflection film or a conductive film is used for automobiles, window glasses for vehicles such as trains, houses, window glasses for buildings such as buildings, It is used for the entire surface of measuring instruments.

A film having a laminated structure including a thin film layer containing silver as a main component has a high transmittance for light in the visible region, and a reflectance for near-infrared light and infrared light having a long wavelength of about 10 μm. Is high. For this reason, when a glass plate using a layered structure film containing a layer containing silver as a main component is used for a window of a building, visible light is taken in from outside and the inflow of heat rays contained in sunlight is reduced. In summer, the cooling load is reduced. Further, heat release from the indoor side can be reduced, and the heating load can be reduced. That is, it can be used as a high-performance heat ray reflective glass plate, particularly a Low-E glass plate, which has a high transmittance to visible light and an excellent heat ray shielding effect. The film having a laminated structure including a layer containing silver as a main component has a sheet resistance of 10 Ω / □ or less.
Among various transparent conductive films, those showing a low resistance value are more preferable.

As a method of forming a thin film of a metal or the like, a spray method, a dipping method, a CVD method, a flexographic printing method and the like can be mentioned in addition to a sputtering method. In the method of manufacturing the structure of the present invention, there is also a manufacturing method in which masking or resist coating is performed in advance when forming a thin film such as a metal, and a thin film of a metal or the like is not formed from a beginning on a predetermined portion as a radio wave convergence pattern. In consideration of mass productivity, productivity, and individual correspondence, a manufacturing method described below in which a predetermined portion is disassembled and removed to form a radio wave convergence pattern using a mass-produced heat ray reflective glass plate or the like is preferable.

According to the structure of the present invention, a radio wave convergence pattern comprising a transparent thin film is provided on a transparent substrate.
It is sufficient that an area having a heat ray reflection function provided so as to surround the radio wave convergence pattern is provided. However, it is not necessary that the area having the heat ray reflection function surrounds the entire outermost periphery of the radio wave convergence pattern. It may be one that surrounds the part. Further, a part of the surrounding region having the heat ray reflection function may include a part having no heat ray reflection function.

The outer periphery of the outermost radio wave transmitting portion of the plurality of ring groups or elliptical groups of the Fresnel zone as the pattern having the radio wave convergence function becomes the innermost circumference of the region having the heat ray reflection function as it is. It is preferred to take.
With this configuration, in the region having the heat ray reflection function, the innermost circumference surrounding the radio wave convergence pattern also has the radio wave convergence function, and thus is excellent as the structure of the present invention.

For example, the glass plate 1 shown in FIG. 3 has a Fresnel zone plate portion 8 as a pattern for converging radio waves, and a thin film portion 9 such as a metal of a heat ray reflection glass plate as a region having a heat ray reflection function. However, if the Fresnel zone plate portion 8 is configured by removing a part of the heat ray reflection coating of the heat ray reflection glass plate, the portion not removed becomes a region having the heat ray reflection function as it is.

An antenna device according to the present invention includes the structure according to the present invention, and a transmitting unit and / or a receiving unit disposed at a position where radio waves are converged by the structure. Transmitter and / or
Or, the structure of the receiving unit is not limited, but may be one that can perform both transmission and reception, may be one that performs transmission and reception independently, and may include any of those that are commercially available and those that are known in the literature . As an example, the one shown in FIG. 1 includes a radiator 5 and a converter 6. The transmitting unit and / or the receiving unit are preferably supported / fixed on a mounting table whose angle and height can be changed within a desired range. When the structure of the present invention is a window glass plate, the mounting table may be provided on a support arm fixed to a window frame. Although the radiator 5 shown in FIG. 1 is shown as a horn structure, it may be constituted by an array of spirals, dipoles, strip lines, slots, and the like.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a cross section of the device of the present invention. In FIG. 1, reference numeral 1 denotes a glass plate having, on the indoor side, a transparent pattern provided with a radio wave convergence pattern and a region having a heat ray reflection function, which are structures of the present invention. Reference numeral 2 denotes a transmitting unit and / or a receiving unit arranged at a position where the radio wave is converged by the radio wave convergence pattern.
, A converter 6, 3 is an incoming radio wave, and 4 is a window frame.

FIG. 3 is a front view of the glass plate 1 as a structure used in the apparatus of the present invention shown in FIG. 1 as viewed from the converter 6 side in FIG. 1 and 3, a glass plate 1 is a radio wave convergence pattern in which a thin film of a metal or the like having transparency is formed on a surface on the indoor side, and a part of the thin film converges a radio wave arriving from the outside of the glass plate. A Fresnel zone pattern 8 is formed. The glass surface other than the radio wave convergence pattern is a thin film portion 9 made of metal or the like as a region having a heat ray reflection function.

More specifically, the radio wave convergence pattern is, as shown in FIG. 3, a plurality of concentric patterns in an annular shape, and a portion where a thin film of metal or the like, which is a portion that transmits radio waves alternately from the center, is removed. It is configured such that portions where thin films of metal or the like, which are opaque portions, are formed alternately and continuously. And
As shown in FIG. 1, a glass plate is attached to a window frame 4 of a building, and a transmitting unit and / or a receiving unit 2 are installed at a focal position away from the glass plate 1 by a distance f. As a result, incoming radio waves can be converged, and gain can be obtained.
The antenna device of the present invention is useful for microwave wireless communication, for example, FWA (Fixed wireless access).

Using a mass-produced heat ray reflection glass plate or the like,
As a manufacturing method of decomposing and removing a predetermined portion, a salt powder or a solution is applied to a thin film of metal or the like having a heat ray reflection function and / or an electromagnetic shielding function formed on a substrate,
For example, a method of removing the thin film on the applied portion by heating can be exemplified. As the salt, a salt in which part or all of the hydrogen ions of an acid are replaced with ammonium ions or alkali metal ions can be used. For details, see
This is described in detail in Japanese Patent Application Publication No. 11-171600, the contents of which are incorporated herein by reference.

As the salt used for removing the thin film, for example,
One or more salts selected from the group consisting of hydrohalides, sulfates, disulfates, amide sulfates, sulfites, thiosulfates, phosphates, formates and oxalates.

Specific examples include an ammonium salt, an alkali metal hydrogen sulfate, an alkali metal disulfate, an alkali metal amide sulfate, an alkali metal thiosulfate, and an alkali metal dihydrogen phosphate. As the alkali metal of the alkali metal salt, sodium and potassium are preferable. More specifically, ammonium chloride, ammonium bromide, ammonium iodide, ammonium sulfate, ammonium hydrogen sulfate, ammonium disulfate, ammonium amido sulfate, ammonium sulfite, ammonium bisulfite, ammonium thiosulfate, triammonium phosphate, ammonium dihydrogen phosphate, Diammonium hydrogen phosphate, ammonium formate, ammonium oxalate, sodium hydrogen sulfate, potassium hydrogen sulfate, sodium disulfate, potassium disulfate, sodium amido sulfate, potassium amido sulfate, sodium thiosulfate, potassium thiosulfate, sodium dihydrogen phosphate And potassium dihydrogen phosphate.

The application of the salt powder or the solution includes application of the salt powder, application of a liquid containing the salt powder, and application of the salt solution. Above all, it is convenient to apply as a liquid containing a powder (the powder is dispersed in a dispersion) or a solution (the powder is dissolved in a solvent). Examples of the dispersion and the solvent include water, alcohol, ester, and ether organic solvents in addition to water. Specifically, water, α-terpineol, ethyl cellosolve, butyl carbitol acetate and the like can be mentioned.

When the composition is applied as a liquid or a solution containing a powder, a drug (thickening agent) for giving a thickening effect to the liquid may be added. In particular, in application by a printing method described later, it is preferable to use a liquid to which a thickener is added. Examples of the thickener include ethyl cellulose, methyl cellulose, an acrylic resin, a styrene resin, a phenol resin, and sodium alginate.

As a coating method, various printing methods such as screen printing and flexographic printing, a spray method, a dipping method, and the like can be used. Further, a resist can be applied to the thin film in a portion not to be decomposed or a film can be applied to protect the portion. Examples of the heating method include heating using an electric furnace capable of heating the entire substrate. The heating temperature may be any temperature at which the thin film reacts with the salt. The salt melts or decomposes by heating to become a highly reactive acid, decomposing the thin film. The heating temperature is preferably equal to or higher than the decomposition temperature of a salt that is decomposed by heating, and is equal to or higher than the melting point of the salt if the salt melts by heating.

[0040]

The present invention will be described below with reference to examples.
The present invention is not limited to these examples, and it goes without saying that various improvements and modifications may be made without impairing the gist of the present invention. (Example 1) The antenna device shown in FIG. 1 was manufactured using a commercially available rectangular waveguide probe as the transmission unit and / or the reception unit 2. The distance f between the glass plate 1 configured as a structure having a radio wave convergence pattern and a heat ray reflection function and the transmission unit and / or the reception unit 2 was set to f = 400 mm. As a structure, a heat-reflective glass plate (Sunlux manufactured by Asahi Glass Co., Ltd.) 1000 mm × 1000 mm × 5.8 m
Using m, the thin film of metal or the like was removed at the following dimensions obtained by calculation, and a radio wave convergence pattern was formed as shown in FIG. The surface of the glass plate other than the radio wave convergence pattern was left as a region having a heat ray reflection function. 2r ₁ = 146 mm, 2r ₂ = 208 mm, 2r ₃ = 256 mm, 2r ₄ = 296 mm, 2r ₅ = 332 mm, 2r ₆ = 366 mm, 2r ₇ = 396 mm, 2r ₈ = 426 mm, 2r ₉ = 454 mm.

At this time, the metal thin film was removed by a screen printing method disclosed in (Example 4) of JP-A-11-171600. Specifically, an α-terpineol solution containing 9% by mass of ethylcellulose and a powder of ammonium dihydrogen phosphate (average particle size: 30 μm) were mixed in 3:
A solution mixed at 7 (mass ratio) was prepared, applied by screen printing, heated at 200 ° C. for 10 minutes, cooled, and washed with water to remove a thin film of metal or the like. And 22.
A radio wave having a frequency of 605 GHz was transmitted from the outside of the glass plate 1 and a radio wave received by a rectangular waveguide probe at a position of a distance f = 400 mm was measured. As a result, a gain of 16 dB was obtained as compared with the case where reception was performed without the glass plate 1.

[0042]

As described above, by using the structure of the present invention, a durable antenna device which is not affected by deterioration due to wind and snow can be constructed, and the appearance of the building is not spoiled. The structure of the present invention has a high directivity gain, can be installed indoors, and does not require a special structure outdoors. Further, other areas of the window glass plate other than those used as the antenna device have a glass plate having a normal necessary function, for example, a heat ray reflection function or an electromagnetic shielding function. In addition, if a structure is manufactured by removing a thin film of metal or the like of a mass-produced heat ray reflection glass plate, an antenna device which is inexpensive and has good compatibility with a conventional method can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a cross section of an antenna device of the present invention.

FIG. 2 is a schematic diagram illustrating a Fresnel zone.

FIG. 3 is a plan view of the glass plate of FIG. 1 as viewed from the indoor side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass plate 2 Transmitting part and / or receiving part 3 Incoming radio wave 4 Window frame 5 Radiator 6 Converter 8 Fresnel zone plate part 9 Thin film part of metal etc.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fuminori Watanabe 1150 Hazawa-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Inside the Central Research Laboratory Asahi Glass Co., Ltd. Central Research Laboratory (72) Inventor Koji Aoki 1150 Hazawacho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Asahi Glass Co., Ltd. Central Research Laboratory F-term (reference) 5J020 AA01 BA06

Claims (2)

[Claims] 1. A pattern formed of a transparent thin film provided on a transparent substrate and having a radio wave convergence pattern for converging radio waves and a heat ray reflection function provided to surround the radio wave convergence pattern. A radio wave convergence structure characterized by being provided with an area. 2. An antenna device comprising: the radio wave convergence structure according to claim 1; and a transmission unit and / or a reception unit arranged at a position where radio waves are converged by the radio wave convergence structure.