JP2023034241A - Antenna device and manufacturing method for the same - Google Patents

Abstract

An object of the present invention is to provide a toughness equivalent to that of a structure while suppressing costs. An antenna device (100) is attached to a first antenna section (11) made of a metal plate having a slit hole (SHL) formed therein and a structure (ST) such that the first antenna section (11) is attached to the structure (ST). A support portion 12 that supports the first antenna portion 11 so as to be fixed to the connection portion 13 that includes a conductive member and is electrically connected to the first antenna portion 11 at one end. And prepare. [Selection drawing] Fig. 1

Description

The present invention relates to an antenna device and a method of manufacturing an antenna device.

In the field of IoT (Internet of Things), where the market is expected to expand, it is known to use a communication system of LPWA (Low Power Wide Area) (Non-Patent Document 1). Since radio waves such as LPWA, Wi-Fi (registered trademark), 5G, and 6G travel in a straight line and have a short communication distance, it is desired to install a large number of antennas.

Therefore, in order to realize the installation of a large number of antennas, it is desired to attach antennas to existing structures regardless of whether they are indoors or outdoors. At this time, it is required that the appearance of the structure is not spoiled by attaching the antenna to the structure. For this reason, glass antennas that have an inconspicuous appearance and can be retrofitted to structures have been provided (Non-Patent Document 2).

In addition, by incorporating an antenna into a special steel manhole cover, a technology has been developed to attach the antenna to the road surface so as not to interfere with vehicles while suppressing damage to the antenna from external forces (Non-Patent Document 3). ).

NTT West, "Commercialization of LoRaWAN (registered trademark) for IoT Business Expansion," NTT Technical Journal, October 2018, pp.44-47 AGC, "Development of AGC's 'Glass Antenna that Converts Windows into a Base Station' 5G Completion", [online], [Searched on July 5, 2021], Internet <URL: https://www.agc .com/news/detail/1200821_2148.html> Meidensha, ``Manhole antenna for real-time monitoring of pipes'', [online], [searched on July 5, 2021], Internet <URL: https://www.meidensha.co.jp/catalog/bb/BB524 -3291.pdf＞

However, when an antenna made of a brittle material such as the glass antenna described above is attached to a structure made of metal or reinforced concrete, the antenna cannot withstand an external force equivalent to that which the structure can withstand. can't Therefore, even in situations where the structure is not damaged by external forces, the antenna may be susceptible to damage. Therefore, when an antenna is attached to a structure, it is required to have toughness equivalent to the structure to which it is attached. In addition, since the antenna has the same toughness as the structure, the method of building the antenna in the structure as described above involves a high workload and a high cost.

SUMMARY OF THE INVENTION An object of the present invention, which has been made in view of such circumstances, is to provide an antenna device and a method of manufacturing an antenna device that can have toughness equivalent to that of a structure while suppressing high workload and high cost. to provide.

An antenna device according to one embodiment includes a first antenna section configured by a metal plate having a slit formed thereon, and a structure attached to the first antenna section, the first antenna section being fixed to the structure. and a connection part including a conductive member and electrically connected to the first antenna part at one end thereof.

A method for manufacturing an antenna device according to an embodiment comprises: From a rectangular plate surface in which a rectangular slit hole is formed, which is made of a metal material, a square having each corner as one corner of the plate surface a folding margin region, each region between the two square regions arranged along the direction of the sides of the plate surface, and the square region and the folding margin region a step of folding in the same direction a boundary line with a central region that is a region different from the folding margin region; The steps of bending and connecting one end of the cable to the slit hole are included.

According to the present invention, it is an object of the present invention to provide an antenna device and a method of manufacturing an antenna device that can have toughness equivalent to that of a structure while suppressing a workload.

It is a figure which shows an example of the antenna device which concerns on 1st Embodiment. 2 is a diagram for explaining a manhole, which is an example of a structure to which the antenna device shown in FIG. 1 is attached; FIG. FIG. 2 is a perspective view showing the antenna device shown in FIG. 1; It is a figure which shows the 1st modification of the antenna apparatus shown in FIG. FIG. 3 is a perspective view showing a second modification of the antenna device shown in FIG. 1; 5B is a top view showing the antenna device shown in FIG. 5A; FIG. It is a perspective view which shows an example of the antenna device which concerns on 2nd Embodiment. FIG. 7 is a perspective view showing the antenna device shown in FIG. 6; FIG. 7 is a diagram showing a first modification of the antenna device shown in FIG. 6; FIG. 7 is a diagram showing a second modification of the antenna device shown in FIG. 6; FIG. 7 is a diagram showing a third modification of the antenna device shown in FIG. 6; 10B is a side view showing the antenna device shown in FIG. 10A; FIG. 10B is a bottom view showing the antenna device shown in FIG. 10A; FIG. It is a perspective view which shows an example of the antenna device which concerns on 3rd Embodiment. 12 is an example of a metal plate used to manufacture the antenna device shown in FIG. 11; 12 is a flow chart showing a method of manufacturing the antenna device shown in FIG. 11;

<<First Embodiment>>
A first embodiment of the present invention will be described in detail below with reference to the drawings.

<Configuration of Antenna Device>
An example of the configuration of the antenna device 100 according to the first embodiment of the present invention will be described.

As shown in FIG. 1, the antenna device 100 is attached to the structure ST.

The antenna device 100 transmits and receives electrical signals to and from the internal device 200 . In this example, the antenna device 100 may transmit and receive electrical signals to and from the internal device 200 through wired communication.

Also, the antenna device 100 transmits and receives electrical signals to and from the external device 300 by wireless communication. In this example, the antenna device 100 transmits and receives electrical signals to and from the external device 300 via a wide area network such as LTE (Long Term Evolution) or LoRaWAN (Long Range Wide Area Network).

The internal device 200 receives an electrical signal transmitted from the antenna device 100 and includes a transmission/reception unit that transmits the electrical signal to the antenna device 100, a control unit that controls the electrical signal, a communication device (first communication device ). The internal device 200 is arranged on the inside S1 side of the structure.

The external device 300 is, for example, a communication device (second communication device) such as a server that manages various information acquired by the internal device 200 . The external device 300 is arranged on the outside S2 side of the structure.

The structure ST in this embodiment is a structure for demarcating a space in the underground A. As shown in FIG. The structure ST is, for example, a manhole 400 buried in the ground A as shown in FIG. The structure ST is made of metal, concrete, resin concrete, or the like.

The manhole 400 includes a neck 41 , a housing 42 and an iron lid 43 . The neck 41 and the housing 42 are made of, for example, reinforced concrete. The neck 41 may be generally cylindrical and the space defined by the neck 41 communicates with the exterior S2 of the structure ST. The housing 42 can have a substantially rectangular parallelepiped shape. Also, the space defined by the neck portion 41 and the space defined by the housing 42 communicate with each other.

The iron cover 43 is a member that covers the boundary (entrance of the manhole 400) between the space on the inside S1 side defined by the manhole 400 and the space on the outside S2 side. In the example of FIG. 2, the iron lid 43 is arranged on the neck portion 41 on the outside S2 side. Further, the iron lid 43 is formed with a hole HL passing through the iron lid 43 .

As shown in FIGS. 1 and 3 , the antenna device 100 includes an antenna section 11 , a support section 12 and a connection section 13 .

The antenna section 11 is composed of a metal plate in which a slit hole SHL is formed. When the current flowing around the slit hole SHL in the antenna section 11 changes, the magnetic field around the antenna section 11 changes, and the antenna section 11 transmits radio waves. The antenna section 11 can function as an active antenna and can also function as a passive antenna.

As shown in FIG. 3 , the slit hole SHL is rectangular when viewed from the normal direction (z-axis direction) of the surface of the metal plate forming the antenna section 11 . In this example, the antenna portion 11 is rectangular, the short sides of the slit hole SHL are parallel to the short sides of the antenna portion 11, and the long sides of the slit hole SHL are parallel to the long sides of the antenna portion 11. .

The slit hole SHL may have a size corresponding to the wavelength λ of the radio wave transmitted/received to/from the external device 300 . For example, the length x1 of the long side of the slit hole SHL can be 0.7λ or more and 0.8λ or less. Also, the length y1 of the short side of the slit hole SHL can be 0.02λ or more and 0.05λ or less. Moreover, the height z of the slit hole SHL can be set to 0.5 mm or more and 2.0 mm or less regardless of the wavelength λ.

The slit hole SHL may be formed by cutting a metal plate manufactured without the slit hole SHL. The slit hole SHL may be formed by molding a metal plate together with the slit hole SHL.

Moreover, when the antenna section 11 is arranged outdoors, a resin plate may be provided on the surface of the antenna section 11 . As a result, the antenna device 100 can prevent the antenna section 11 from coming into direct contact with outdoor objects, people, etc., or from being exposed to wind and rain, thereby reducing damage to the antenna section 11 .

The support section 12 is attached to the structure ST and supports the antenna section 11 so as to be fixed to the structure ST. The support portion 12 protrudes in the direction in which the metal plate that constitutes the antenna portion 11, which is provided at the end portion of the antenna portion 11, extends. In the example shown in FIG. 3, the support part 12 is provided at substantially the center of each side of the rectangle formed by the metal plate, and protrudes in a direction orthogonal to each side. The support portion 12 may be provided integrally with the antenna portion 11 or may be provided by being attached to the antenna portion 11 .

The support 12 is attached to the structure ST by using screws, adhesive application, or the like. As shown in FIG. 2, in an example where the structure ST is a manhole 400, the support section 12 may be attached to the iron lid 43 so that the antenna section 11 covers the hole HL of the iron lid 43, for example. In addition, in a configuration in which the supporting portion 12 is formed of a different kind of metal from the metal forming the structure ST, an anti-corrosion material formed of an insulating material such as resin is provided between the supporting portion 12 and the structure ST. Layers may be provided. Corrosion due to bonding of dissimilar metals in the supporting portion 12 and the structure ST can thereby be suppressed.

The connecting portion 13 includes a conductive member and is electrically connected to the antenna portion 11 at one end. In addition, the connecting portion 13 is electrically connected to the internal device 200 at the other end. Thereby, the connection section 13 electrically connects the antenna section 11 and the internal device 200 .

The connecting portion 13 may include a coaxial cable 131 and a connector 132 . In such a configuration, one end of the coaxial cable 131 is connected to the side surface of the slit hole SHL in the antenna section 11 . Specifically, one end of each of the inner conductor and the outer conductor of the coaxial cable 131 is connected to the side surface of the slit hole SHL in the antenna section 11 .

Also, the connector 132 connects the coaxial cable 131 and the cable CB. The cable CB is connected by a cable 201 connected to the internal device 200 and a connector 202 .

The antenna section 11 may have a plurality of slit holes SHL, and the connection section 13 may be connected to each side surface of the plurality of slit holes SHL. Thereby, compared with the case where one slit hole SHL is formed, more radio waves can be transmitted per unit time, and the communication speed is improved. Further, by appropriately designing the positions and directions of the plurality of slit holes SHL, the antenna device 100 can better control the directivity of radio waves based on the electrical signals transmitted from the iron lid 43 . Along with this, it is possible to suppress the radio wave attenuation that occurs remarkably especially in the case of parasitic relay.

As described above, the antenna device 100 according to the first embodiment includes the antenna section 11 configured by a metal plate in which the slit hole SHL is formed, and the antenna device 100 attached to the structure ST. and a connection portion 13 including a conductive member and electrically connected to the first antenna portion 11 at one end. . Thereby, the antenna device 100 can have toughness equivalent to that of the structure while suppressing the workload and cost.

<First modification>
In the above-described first embodiment, the connection section 13 of the antenna device 100 is connected to the internal device 200 via the cable CB connector 202 and the cable 201, but the invention is not limited to this. As shown in FIG. 4 , the connection section 13 of the antenna device 100 may be connected to the antenna 203 via the cable CB and connector 202 . Accordingly, the antenna device 100 transmits and receives electrical signals to and from the antenna 203 through wired communication, and the antenna 203 transmits and receives electrical signals to and from the internal device 200 through wireless communication.

The antenna 203 is preferably a directional antenna and may include an internal substrate made of dielectric material and a directional conductive pattern provided on the internal substrate. The internal substrate is preferably rectangular. The directional antenna can be, for example, a patch antenna or the like.

<Second modification>
In the first embodiment described above, the slit hole SHL is rectangular, but it is not limited to this. As shown in FIGS. 5A and 5B, the slit hole SHL does not have to be rectangular. For example, the slit hole SHL may include a wide portion SHL1 and a narrow portion SHL2 arranged adjacent to the wide portion SHL1. The length of the narrow portion SHL2 in the transverse direction is shorter than the length of the wide portion SHL1 in the transverse direction. The length of the narrow portion SHL2 in the lateral direction (y-axis direction) is shorter than the length of the wide portion SHL1 in the lateral direction (y-axis direction). Thereby, impedance matching can be achieved.

In the example shown in FIGS. 5A and 5B, the slit hole SHL includes two wide width portions SHL1 and one narrow width portion SHL2. One wide portion SHL1 of the two wide portions SHL1 is arranged adjacent to one end of the narrow portion SHL2 in the x-axis direction. Further, the other wide portion SHL1 is arranged adjacent to the other end in the x-axis direction of the narrow portion SHL2. Here, the two wide width portions SHL1 and one narrow width portion SHL2 are arranged such that one of the sides extending in the x-axis direction is on one straight line.

Furthermore, the length of 1/2 of the length x2 of the narrow portion SHL2 in the x-axis direction can be set to 1/8 or less of the wavelength of the radio waves transmitted by the first antenna section 11 . This weakens the electric field near the feeding point and strengthens the electric field at the end of the slit hole SHL located away from the feeding point, so that the antenna device 100 can improve the radiation efficiency.

<Third Modification>
In the first embodiment described above, the connecting portion 13 includes the connector 132, but this is not the only option. Connection portion 13 may not include connector 132 , and in such a configuration the other end of coaxial cable 131 may be directly connected to internal device 200 or antenna 203 .

<<Second Embodiment>>
A second embodiment of the present invention will be described in detail below with reference to the drawings.

<Configuration of Antenna Device>
An example of the configuration of the antenna device 100-1 according to the second embodiment of the present invention will be described. In 2nd Embodiment, the same code|symbol is attached|subjected about the same structure as 1st Embodiment, and description is abbreviate|omitted.

As shown in FIG. 6, the antenna device 100-1 includes an antenna section 11, a support section 12-1, a connection section 13, and a housing section .

The housing part 14 forms a closed space together with the antenna part 11 and a virtual plane that covers the slit hole SHL. The housing portion 14 includes a side portion 141 and a bottom portion 142 .

As shown in FIGS. 6 and 7 , the side surface portion 141 is provided in contact with the antenna portion 11 and extends in the normal direction of the metal plate forming the antenna portion 11 . That is, the side surface portion 141 defines the side surface of the closed space described above. In this example, the side surface portion 141 is formed of four surfaces whose normal directions are perpendicular to the normal direction of the metal plate forming the antenna portion 11 . Each of the four surfaces forming the side surface portion 141 is rectangular, and one side of the rectangle is provided so as to be connected to the metal plate forming the antenna portion 11 . The side portion 141 may be made of a metal material.

The bottom surface portion 142 is provided in contact with the side surface portion 143 and has a surface parallel to the metal plate forming the antenna portion 11 . That is, the bottom surface portion 142 defines the bottom surface of the closed space described above. In the example described above, the surface forming the bottom surface portion 142 is rectangular, and each side of the rectangle is connected to the side opposite to the antenna portion 11 in each of the four surfaces forming the side surface portion 141. is provided in The bottom portion 142 may be made of a metal material.

The support section 12-1 supports the antenna section 11 with respect to the structure ST, like the support section 12 of the first embodiment. Unlike the support part 12 of the first embodiment, the support part 12-1 is provided on each of the four side parts 141 of the housing part 14 and protrudes in the normal direction of the surface. The support portion 12-1 may be provided integrally with the side portion 141, or may be provided by being attached to the side portion 141. FIG.

The surface of the metal plate forming the antenna section 11 may be slightly smaller than the cross section of the hole HL formed in the structure ST. For example, the length of the first antenna portion 11 in the x-axis direction is about 1 mm smaller than the length of the hole HL in the x-axis direction, and the length of the antenna portion 11 in the y-axis direction is about 1 mm longer than the length of the hole HL in the y-axis direction. About 1 mm smaller than the length. Therefore, the antenna section 11 can be smoothly fitted into the hole HL, and the antenna device 100-1 can be easily attached to the structure ST.

As described above, the antenna device 100-1 according to the second embodiment further includes the side surface portion 141 which is connected to the antenna portion 11 and extends in the normal direction of the metal plate. 12-1 is attached to the side portion 141. FIG. Thereby, the support part 12-1 can be attached to the surface of the structure ST on the inside S1 side. Also, unlike the antenna device 100 of the first embodiment, unnecessary convex portions on the outside S2 side can be reduced, thereby improving user safety.

Further, in the antenna device 100-1 according to the second embodiment, the side surface portion 141 may be made of a metal material. Thereby, the connecting portion 13 arranged inside the side portion 141 is covered with metal. Therefore, disturbance acting on the connecting portion 13 can be suppressed.

Further, in the antenna device 100-1 according to the second embodiment, the bottom portion 142 may be made of a metal material. As a result, the connection portion 13 provided between the bottom portion 142 and the antenna portion 11 is covered with metal. Therefore, disturbance acting on the connecting portion 13 can be suppressed.

<First modification>
In the above-described second embodiment, the connection section 13 of the antenna device 100-1 is connected to the internal device 200 via the cable CB and the connector 202, but it is not limited to this. As shown in FIG. 8, the connection section 13 of the antenna device 100-1 may be connected to the antenna 203 via the cable CB and the connector 202. FIG. As a result, the antenna device 100-1 transmits and receives electrical signals to and from the antenna 203 through wired communication, and the antenna 203 transmits and receives electrical signals to and from the internal device 200 through wireless communication.

<Second modification>
As shown in FIG. 9, the antenna device 100-1 may further include a second antenna section 15, which is an antenna different from the antenna section (first antenna section) 11. As shown in FIG. The second antenna section 15 is attached to the surface of the bottom surface section 142 opposite to the side facing the antenna section 11 . In such a configuration, the connection portion 13 of the antenna device 100-1 may or may not include the connector 132. FIG. In a configuration in which the connecting portion 13 does not include the connector 132 , one end of the coaxial cable 131 is connected to the antenna portion 11 and the other end of the coaxial cable 131 is connected to the second antenna portion 15 . In a configuration in which connection portion 13 includes connector 132 , antenna portion 11 may be connected to second antenna portion 15 via connector 132 . In addition, in a configuration in which the bottom surface portion 142 is made of a metal material, the other end of the coaxial cable 131 may be connected to the bottom surface portion 142 and connected to the second antenna portion 15 via the bottom surface portion 142. . Thus, when the second antenna unit 15 receives radio waves from the internal device 200 by wireless communication, the first antenna unit 11 receives an electric signal based on the radio waves via the coaxial cable 131, and responds to the electric signal. based radio waves are transmitted to the external device 300 . Similarly, when the first antenna unit 11 receives radio waves from the external device 300 by wireless communication, the second antenna unit 15 receives an electric signal based on the radio waves via the coaxial cable 131, and to the internal device 200. Therefore, antenna device 100-1 can function as an unpowered relay antenna.

The second antenna section 15 can be a patch antenna in which a conductive pattern is provided on a dielectric. In such a configuration, by grounding the bottom portion 142, there is no need to separately provide a member for grounding, and the size of the antenna device 100-1 can be reduced.

Further, the bottom surface portion 142 may be provided so that the distance from the first antenna portion 11 to the second antenna portion 15 is 1/2 or more of the long side length x1 of the slit hole SHL. Thereby, interference between the first antenna section 11 and the second antenna section 15 is reduced. However, by further providing a configuration for reducing interference, or if the interference is at a level that does not pose a problem when using the antenna, the distance from the first antenna section 11 to the second antenna section 15 can be reduced to the length It may be provided to be less than 1/2 of x1.

<Third Modification>
As shown in FIG. 10A, the slit hole SHL formed in the antenna portion 11 may include a wide portion SHL1 and a narrow portion SHL2, similarly to the third modification of the first embodiment. .

Also, in the example shown in FIG. 10A, the length of the support portion 12-1 is substantially the same as the length of the side surface portion 141 connected to the support portion 12-1. In FIG. 10A, the support portion 12-1 projecting in the y-axis direction with respect to the antenna portion 11 is represented as “support portion 121”, and the support portion 12-1 projecting in the x-axis direction with respect to the antenna portion 11 is denoted as "support 122".

The length x3 of the support portion 121 in the x-axis direction is the same as the length of the antenna portion 11 in the x-axis direction, and is 119 mm in this example. Moreover, the length y3 of the support portion 122 in the y-axis direction is the same as the length of the antenna portion 11 in the y-axis direction, and is 49 mm in this example. As a result, the support portion 12-1 is more firmly attached to the structure ST than in a configuration in which the length of the support portion 12-1 in the direction parallel to the side on the antenna portion 11 side is shorter than the length of the side. . Therefore, the support section 12-1 can more firmly support the antenna section 11 with respect to the structure ST.

In addition, as shown in FIG. 10A, the length y4 of the support portion 121 in the y-axis direction and the length x4 of the support portion 121 in the x-axis direction are 14 mm. In this example, as shown in FIG. 10B, the length z2 of the side surface portion 141 in the z-axis direction is 55 mm, and the length z3 of the second antenna portion 15 in the z-axis direction is 5.5 mm. be. A length z4 from the end on the first antenna section 11 side to the support section 12-1 in the z-axis direction is 8 mm. Furthermore, in this example, as shown in FIG. 10C, the length x5 in the x-axis direction of the second antenna section 15 is 44 mm, and the length y5 in the y-axis direction is 46 mm.

Also, the third modification of the first embodiment may be applied to the second embodiment.

<<Third Embodiment>>
A third embodiment of the present invention will be described in detail below with reference to the drawings.

<Configuration of Antenna Device>
An example of the configuration of the antenna device 100-2 according to the third embodiment of the present invention will be described. In the third embodiment, the same components as those in the first or second embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

As shown in FIG. 11, the antenna device 100-2 includes an antenna section 11, a support section 12-2, a connection section 13, and a housing section 14-2.

The housing portion 14-2 includes side portions 141, like the housing portion 14 of the second embodiment. The housing part 14-2 does not include the bottom part 142 unlike the housing part 14 of the second embodiment.

Unlike the support portion 12 of the first embodiment and the support portion 12-1 of the second embodiment, the support portion 12-2 is on the opposite side of the side portion 141 to the side connected to the first antenna portion 11. is connected to the end of the Specifically, the support portion 12-2 has a rectangular shape whose one side is the side of the side portion 141 opposite to the first antenna portion 11 side. projecting outward in the normal direction of the Note that the support portion 12-2 may be provided integrally with the side portion 141, or may be provided by being attached to the side portion 141. FIG.

<Manufacturing Method of Antenna Device>
Here, a process for manufacturing the antenna device 100-2 according to the third embodiment will be described with reference to FIGS. 12 and 13. FIG. FIG. 12 is a flow chart showing an example of steps for manufacturing the antenna device 100-2 according to the third embodiment. The process of manufacturing the antenna device 100-2 described with reference to FIG. 12 corresponds to an example of the method of manufacturing the antenna device 100-2 according to the first embodiment.

As shown in FIG. 13, in step S1, square areas MP1, which are square areas at four corners, are cut out from a rectangular metal plate MP (see FIG. 12) in which rectangular slit holes SHL are formed. The metal plate MP is provided with slit holes SHL extending in the longitudinal direction of the plate surface. The square region MP1 is a square region having each corner of the metal plate MP as one corner. The side length Lsq of the square is shorter than 1/2 of the length (y6-y1) obtained by subtracting the short side length y1 of the slit hole SHL from the short side length y6 of the plate surface. The length Lsq of the sides of the square may be appropriately determined based on the size of the antenna section 11 in the antenna device 100-2 manufactured by this method.

Note that the slit holes SHL may be formed by cutting the metal plate MP in which the slit holes SHL are not formed before executing step S1.

By executing step S1, a metal plate composed of a folding margin region MP2 and a central region MP3 is formed. The folding margin region MP2 is a region between two square regions MP1 arranged along the side direction of the metal plate MP. In the example shown in FIG. 12, the folding margin region MP2 includes a folding margin region MP21 between the square regions MP11 and MP12, and a folding margin region MP13 and MP14 between the square regions MP13 and MP14. a folding margin region MP24 between the square regions MP11 and MP14; and a folding margin region MP22 between the square regions MP12 and MP13. The central region MP3 is a region different from the square region MP1 and the folding margin region MP2 in the metal plate MP.

In step S2, the boundary lines LN1 between the folding margin regions MP2 and the central region MP3 are folded in the same direction. For example, the boundary lines LN1 may be bent 90 degrees in the same direction.

In step S3, each boundary parallel line LN2 of the folding margin region MP2 is folded in the direction opposite to the direction in step S2. At this time, the boundary parallel line LN2 may be bent 90 degrees. The boundary parallel line LN2 is a line segment parallel to the boundary line LN1 in each folding margin region MP2 and bisects the folding margin region MP2.

In step S4, the connecting portion 13 is connected to the slit hole SHL. Specifically, one end of the cable is connected to the side surface of the slit hole SHL. Additionally, the other end of the cable may be connected to connector 132 .

Note that the connection unit 13 of the antenna device 100-2 in the third embodiment may not include the connector 132, and in such a configuration, in step S4, a process of connecting the other end of the cable to the connector 132 is executed. do not. In addition, in a configuration in which connection portion 13 includes connector 132, antenna device 100-2 can be easily connected to internal device 200. FIG. In a configuration in which the connecting portion 13 does not include the connector 132, the other end of the coaxial cable 131 may be directly connected to the internal device 200 by soldering or the like.

As described above, in the antenna device 100-2 according to the third embodiment, the support portion 12-2 is provided at the end portion of the side portion 141 opposite to the side connected to the first antenna portion 11. is provided. As a result, the antenna device 100-2 can be easily manufactured using the metal plate MP, and can have toughness equivalent to that of the structure while suppressing the work load in attaching it to the structure.

In addition, the method for manufacturing the antenna device 100-2 according to the third embodiment is performed by forming a rectangular metal plate MP made of a metal material into a square area having each corner of the metal plate MP as one corner. a step of cutting out a square region MP1, each of the folding margin regions MP2 that are regions between two squares arranged along the direction of the sides of the metal plate MP, and the square region MP1 and the folding margin region MP2 a step of folding the boundary line LN1 between the central region MP3, which is a different region, in the same direction; and Bending the boundary parallel line LN2, which is a segment, in a direction opposite to the direction in which the boundary line LN1 is bent. As a result, it is possible to easily manufacture the antenna device 100-2 that can have toughness equivalent to that of the structure while suppressing the work load in attaching it to the structure.

The first to third modifications of the first embodiment and the first and third modifications of the second embodiment may be applied to the third embodiment.

The present invention is not limited to the above embodiments and modifications. For example, the various types of processing described above may not only be executed in chronological order according to the description, but may also be executed in parallel or individually according to the processing capacity of the device that executes the processing or as necessary. In addition, appropriate modifications are possible without departing from the gist of the present invention.

Although the above embodiments have been described as representative examples, it will be apparent to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of this disclosure. Therefore, the present invention should not be construed as limited by the embodiments described above, and various modifications and changes are possible without departing from the scope of the appended claims.

11 Antenna section (first antenna section)
12, 12-1, 12-2 support portion 13 connection portion 14, 14-2 housing portion 15 second antenna portion 41 neck portion 42 housing 43 iron lids 100, 100-1, 100-2 antenna devices 121, 122 Supporting portion 131 Coaxial cable 132 Connector 141 Side portion 142 Bottom portion 200 Internal device 201 Coaxial cable 202 Connector 203 Antenna 300 External device 400 Manhole

Claims (8)

a first antenna section configured by a metal plate having a slit hole;
a support that is attached to a structure and supports the first antenna so that the first antenna is fixed to the structure;
a connecting portion including a conductive member and electrically connected to the first antenna portion at one end;
An antenna device comprising: Further comprising a side portion provided in contact with the first antenna portion and extending in a normal direction of the metal plate,
2. The antenna device according to claim 1, wherein said support portion is attached to said side portion. a bottom portion provided contiguously with the side portion and having a surface parallel to the metal plate;
a second antenna section attached to a side of the bottom surface opposite to the side facing the first antenna section;
3. The antenna device of claim 2, further comprising: 3. The antenna device according to claim 2, wherein said support portion is connected to and protrudes outward from an end portion of said side surface portion opposite to a side connected to said first antenna portion. The antenna device according to any one of claims 2 to 4, wherein the side portion is made of a metal material. 4. The antenna device according to claim 3, wherein said bottom portion is made of a metal material. the slit hole includes a wide portion and a narrow portion adjacent to the wide portion;
The antenna device according to any one of claims 1 to 6, wherein the length of the narrow portion in the transverse direction is shorter than the length of the wide portion in the transverse direction. A step of cutting out a square area, which is a square area at the four corners, from a rectangular plate surface in which a rectangular slit hole is formed and which is made of a metal material;
A boundary between each of the folding margin regions, which are regions between the two square regions arranged along the direction of the sides of the plate surface, and a central region, which is a region different from the square regions and the folding margin regions. folding the lines in the same direction as each other;
a step of bending a boundary parallel line, which is a line segment parallel to the boundary line in each of the folding margin regions and which divides the folding margin region into two, in a direction opposite to the direction;
connecting one end of a cable to the side surface of the slit;
A method of manufacturing an antenna device, comprising:

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