JP6762202B2 - Arrangement method of wireless communication device, wireless network system and wireless communication device - Google Patents

Description

The present invention relates to a method of arranging a wireless communication device, a wireless network system, and a wireless communication device, and particularly, a method of arranging a wireless communication device, a wireless network system, and a wireless communication device suitable for communication using a building structure as a communication medium. Regarding.

Wireless communication has become widespread in order to improve convenience. Wireless communication networks are also used in industrial plants such as factories and power plants because of the ease of installation and equipment expansion.

In wireless communication, there is a problem in areas where radio wave transmission attenuation is large, such as walls and equipment. There are large equipment, walls, and metal doors in the plant, and the transmission attenuation in wireless communication is large. In particular, in a nuclear power plant, it is necessary to shield radiation, secure the strength of the building, and have a highly watertight structure against tsunami, etc., and reinforced concrete walls with a thickness of 1 m or more and metal doors are used.

In this case, wireless communication is possible by providing a radio wave transmission window on the wall or providing a communication path or the like that bypasses the wall and connects the space inside the wall and the space outside the wall. However, construction is required for installation, which requires cost and time. In addition, it is difficult to construct a thick reinforced concrete wall with a thickness of 1 m, such as a nuclear power plant. Therefore, for example, there is known a technique in which a large antenna having high reception efficiency such as a horn antenna is arranged across a wall, and radio waves transmitted through the wall are received, amplified, and re-radiated. Such a technique is described in, for example, Japanese Patent Application Laid-Open No. 2011-29992.

Japanese Unexamined Patent Publication No. 2011-29992

Reinforced concrete walls have a large amount of transmission attenuation when performing wireless communication. For example, with a 1 m thick, high-density reinforced concrete wall, an attenuation of about 100 dB is expected in the 2.4 GHz band used in general unlicensed radios, and even if transmitted at maximum output, it will be attenuated below the minimum sensitivity. It ends up. In particular, in reinforced concrete constituting a high-strength wall surface, reinforcing bars having a large diameter are embedded at a short pitch, so that the amount of transmission attenuation is further increased. In the above-mentioned conventional technique, a three-dimensionally large structure such as a horn antenna generally has a large influence on the layout of the room. In addition, the reinforced concrete wall has a large amount of transmission attenuation, and it is not always possible to obtain sufficient reception strength.

The present invention has been made in view of such a situation, and provides a method for arranging a wireless communication device, a wireless network system, and a wireless communication device that are easy to install and capable of wireless communication even in an area where electromagnetic waves are shielded. The purpose.

In order to achieve the above object, in the present invention, the wireless communication device is arranged in the first space on one side of the shield formed by the reinforced concrete wall and the metallic object, and in the second space on the other side. A wireless communication device that performs wireless communication between the two, the reinforced concrete wall has an opening penetrating from one side to the other, and the metallic object is arranged in the opening, and the opening. It is configured to have a first antenna arranged at any position from the metallic object to the reinforced concrete wall surface in the portion.

More intelligently, the antenna element is placed in close contact with the wall surface near the metal door.

The antenna element is a dipole antenna or a flat antenna element.

Further, the antenna element has a dielectric layer covered with a dielectric having a dielectric constant of ε1 or more on the wall surface, the dielectric layer is arranged in close contact with the wall surface, and the wavelength shortening effect due to the dielectric constant ε2 is further provided. The antenna element is designed in consideration of.

Further, the antenna element is composed of a plurality of antenna elements, and has a mechanism for adjusting the amplitude and phase of input / output from the wireless communication unit for each element.

The wireless network construction device includes a first wireless communication unit that connects a plurality of first antenna elements installed near a metal door at an opening of the wall surface, and a plurality of second wireless communication units that are in close contact with the wall surface sandwiching the metal door. It has a second wireless communication unit for connecting the antenna elements of the above, and has a determination unit for measuring the strength of signals transmitted and received between the antenna elements and determining the optimum position of the second antenna element.

Further related features, actions and effects will be clarified from the description and the accompanying drawings of the present specification. Moreover, the aspect of the present invention is achieved and realized by the combination of elements and various elements and the following detailed description and the aspect of the appended claims.

According to the present invention, it is possible to easily install an antenna and perform wireless communication even in an area where electromagnetic waves are shielded.

It is a figure which shows the schematic configuration example of the wireless communication apparatus which concerns on embodiment of this invention. It is a figure which shows the schematic configuration example (perspective view) of the wireless communication apparatus which concerns on embodiment of this invention. It is a figure which shows the example of the electromagnetic field analysis result which concerns on embodiment of this invention. It is a figure which shows the schematic configuration example of the wireless communication apparatus which concerns on embodiment of this invention. It is a figure which shows the schematic configuration example of the wireless communication apparatus which concerns on embodiment of this invention. It is a figure which shows the schematic configuration example of the wireless network construction apparatus which concerns on embodiment of this invention. It is a figure which shows the schematic structure of the wireless network system which concerns on embodiment of this invention. It is a figure which shows the schematic configuration example of the wireless network construction apparatus which concerns on embodiment of this invention. It is a figure which shows the schematic configuration example of the wireless communication apparatus which concerns on embodiment of this invention. It is a figure which shows the schematic configuration example of the wireless communication apparatus which concerns on embodiment of this invention. It is a figure which shows the schematic configuration example of the wireless communication apparatus which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the attached drawings, functionally the same elements may be displayed with the same number. The accompanying drawings show specific embodiments and implementation examples based on the principles of the present invention, but these are for the purpose of understanding the present invention, and in order to interpret the present invention in a limited manner. Not used.

In the present embodiment, the description is given in sufficient detail for those skilled in the art to carry out the present invention, but other implementations and embodiments are also possible, without departing from the scope and spirit of the technical idea of the present invention. It is necessary to understand that it is possible to change the structure and structure and replace various elements. Therefore, the following description should not be construed as limited to this. Further, in the present specification and the drawings, components having substantially the same function or configuration are designated by the same reference numerals, so that duplicate description will be omitted.

<Configuration of wireless communication device>
FIG. 1 is a diagram showing a schematic configuration of a wireless communication device 100 according to an embodiment of the present invention. The wireless communication device 100 is composed of at least the first antenna element 101 and the first wireless communication unit 102. The first antenna element 101 preferably has a shape having a small thickness, such as a dipole antenna or a flat antenna. The first wireless communication unit 102 is connected to the first antenna element 101 by a connector and a cable to transmit and receive wireless signals. FIG. 110 is a schematic view showing a horizontal cross-sectional shape of a concrete wall that serves as a shield for radio waves. Although only a part of it is shown in the figure, it is a wall surface that constitutes a room of a building. Similarly, 112 represents the horizontal cross-sectional shape of the metal door. Further, 111 represents the horizontal cross-sectional shape of the reinforcing bar in the concrete wall. In the figure, the part shown by the same small circle as the 111 reinforcing bar also represents the reinforcing bar. The spaces on the right and left sides of the metal door 112 and the concrete wall 110 are separated by the metal door and the concrete wall.

Further, 110-A in FIG. 1 represents a surface of the concrete wall facing the space in which the first antenna element 101 is installed on one surface in the thickness direction. The space is called the first space. 110-B represents the other side of the concrete wall facing the space partitioned from the first space by the concrete wall and the metal door. The space is called a second space.

On the other hand, 110-C and 110-D are surfaces forming an opening in which a metal door exists, 110-C represents a surface in contact with the first space, and 110-D represents a surface in contact with the second space.

FIG. 2 shows a specific configuration of the concrete wall 110 and the metal door 112 (region A) of FIG. FIG. 2 is a perspective projection drawing showing a part of the reinforced concrete wall 110 and one metal door 112. Although only a part of it is shown in the figure, it is a wall surface that constitutes a room of a building.

The four types of FIGS. 2 (a) and 2 (b) show the same location, and show different viewing angles and open / closed states of the metal door. 2 (a) and 2 (c) are views from the first space 110-A, and FIGS. 2 (b) and 2 (d) are views from the second space 110-B. Therefore, the reinforced concrete wall shown in FIGS. 2 (a) and 2 (c) is the reinforced concrete wall 110 facing the first space, and the reinforced concrete wall shown in FIGS. 2 (b) and 2 (d) is from the second space. The reinforced concrete wall 110 seen is shown. The first space and the second space may be reversed.

2 (a) and 2 (b) show the metal door 112 in the closed state, and FIGS. 2 (c) and 2 (d) show the metal door 112 in the open state. In each figure, the surrounding reinforced concrete walls, ceilings, floors, etc. are omitted. FIG. 1 is, for example, a top view of FIG. 2A, showing a part of a metal door and a reinforced concrete wall.

In a nuclear power plant, it is necessary to shield radiation, secure the strength of the building, and have a highly watertight structure against tsunami, etc., and reinforced concrete walls with a thickness of 1 m or more and metal doors are used.

Keeping in mind that the frequency of the microwave band widely used for wireless communication and the frequency of 2400 MHz band widely used without a license are used, concrete materials are generally made of relative dielectric at the frequency of the microwave band widely used for wireless communication. Reinforced concrete with a thickness of 1 m or more is often used in order to secure strength in nuclear plants because it has lossy electrical characteristics with a rate of 5 to 7 and a conductivity of 0.002 to 0.1 S / m. The transmission attenuation from one wall surface to the other wall surface of such electrical characteristics is about 80 dB in the 2400 MHz band, which is widely used without a license, and in the case of reinforced concrete in which reinforcing bars with a diameter of about 40 mm are meshed at a pitch of 200 mm. It will be about 100 dB. Also, metal doors are considered complete shields in the 2400MHz band. The transmission power in the unlicensed communication standard is about 10 dBm, the minimum reception sensitivity is designed to be about -90 dBm, and if the attenuation of the concrete wall is 100 dB, communication is almost impossible.

In this embodiment, when the transmission power Pt [dBm], the minimum reception sensitivity Pr [dBm], and the reception margin of the wireless communication device are M [dB], the thickness of the metal door 112 is the material constituting the reinforced concrete. It is assumed that the thickness is such that the transmission loss is Lt = Pt-Pr + M or less. That is, when Pt = 10, Pr = -90, M = 30, and the transmission loss of reinforced concrete is La = 100 dB / m, the allowable attenuation is Lt = 10-(-90) + 20 = 70 dB, and the allowable distance is Dm. = La / Lt * D = 70cm or less for metal doors.

When the antenna element 101 is arranged on the surface of 110-C, the antenna element 101 is arranged at a distance within the allowable distance Dm from the surface on 110-B with the metal door interposed therebetween. That is, when the antenna element 101 is arranged on the surface of the reinforced concrete surface 110-C, the allowable distance Dm is set on the assumption that the communication radio wave propagates from the upper surface of the reinforced concrete surface 110-B (the connection surface with the reinforced concrete surface 110-D). Calculate.

The permissible distance Dm can be obtained in more detail by calculating it by a numerical analysis method including a neighborhood solution of Maxwell's equations including a reinforced concrete structure, a metal door structure, and an antenna element. The time domain difference method (FDTD method), the finite element method (FEM), the boundary element method (BEM), etc. are known.

FIG. 3 is an analysis example obtained by the FDTD method when the antenna element is located at a certain position. In FIG. 3, the horizontal direction of the paper surface corresponds to the vertical direction of the concrete wall 110. Reference numeral 301 denotes an area in the second space where the allowable attenuation is equal to or less than the allowable attenuation when the first antenna element 101 is arranged in the vicinity of the metal door 112. It is possible to obtain an allowable distance by performing analysis by changing the position of the antenna element.

As described above, it is possible to reach 110-B from the antenna 101 placed in close contact with the concrete wall opening surface 110-C in contact with the first space within the allowable distance Dm or less, which is the allowable attenuation amount Lt or less. Therefore, it is possible to secure an area where the received power of the radio wave received by the second antenna placed in the second space is Pr + M or more. If the distance from the opening surface 110-D facing the second space is within the permissible distance Dm, the first antenna 101 is arranged in a portion in contact with the first space even on 110-A. You may. Further, as long as the distance between 110-B and 110-A, that is, the thickness of the concrete wall is the allowable distance Dm or less, it can be installed at any place of 110-A.

<Antenna configuration example 1>
A modified example of this embodiment will be described below. In the modified example, a part different from the above-described embodiment will be described. Therefore, the part where the explanation is omitted is the same. FIG. 4 is a diagram showing a schematic configuration of the first antenna element according to the embodiment of the present invention. The difference from FIG. 1 is that the first antenna element 101 is covered with a dielectric 201 having a relative permittivity ε2 of the concrete wall 110 or more, and a dielectric as the first antenna element. Since the wavelength in 201 has a length of 1 / √ε2 with respect to the wavelength λ in the air due to the wavelength shortening effect, the design of the antenna element has been changed to 101-A according to the dielectric constant ε2.

By doing so, the reflection from the surface of the concrete wall is reduced, so even if the power supplied from the wireless communication unit 102 is the same, the incident power into the wall surface can be expected to be large, so the allowable distance Dm is increased. It becomes possible. Therefore, since the range in which the first antenna can be installed is widened, the degree of freedom of arrangement is increased and the installation becomes easy.

<Antenna configuration example 2>
FIG. 5 is a diagram showing a schematic configuration of the first antenna element according to the embodiment of the present invention. The difference from FIG. 1 is that three antenna elements, 101-1, 101-2, and 101-3, are arranged so as to be shifted by a distance d, and between each antenna element and the wireless communication unit 102, 401 It is being connected via the power supply coefficient adjusting unit. In this embodiment, three elements will be described, but two elements or four or more elements may be used.

The power supply coefficient adjusting unit 401 connects to the wireless communication unit 102 to transmit and receive wireless signals. The radio signal is distributed to each element by adjusting the phase and amplitude in the feeding coefficient adjusting unit. As a result of the adjustment in the feeding coefficient adjusting unit 401, the complex amplitudes radiated from the antenna elements 101-1, 101-2, and 101-3 are set to V1, V2, and V3, respectively.

Θ in FIG. 5 indicates the angle of each antenna element from the bore sight direction. In FIG. 5, the boresight direction of each element is the direction perpendicular to the concrete wall opening surface 110-C of the first space.

Now, let k1 be the wavenumber for the shortened wavelength λ1 in the concrete wall 110, let j be the imaginary unit, and let w2 and w3 be the weighting coefficients (real numbers).

If V2 = w2 * V1 * exp (-j * k1 * d * sinθ) and V3 = w3 * V1 * exp (-j * 2 * k1 * d * sinθ), then each element radiated in the θ direction Since the phases are aligned, it is possible to strengthen each other in the θ direction and raise the radiation level in that direction.

Further, since λ1 depends on the dielectric constant of the concrete wall 110, if the dielectric constant includes an error, a deviation occurs in the θ direction. Therefore, the deviation in the θ direction can be reduced by adjusting the phase with the power supply adjusting unit 401 according to the actual concrete wall 110.

Further, V1, V2, and V3 and the combined radiation angle characteristics have a mutual conversion relationship similar to the Fourier transform and the inverse Fourier transform, and it is desired by adjusting V1, w2, and w3 by the feeding adjustment unit 401. It is also possible to suppress radiation other than the direction of. However, since there is a limit to the direction in which suppression is possible depending on the number of elements used, not all can be suppressed.

By doing so, even if the power supplied from the wireless communication unit 102 is the same, the incident power in the direction in which the propagation loss of the concrete wall 110 is small can be expected to be large, so that the allowable distance Dm can be increased. Therefore, since the range in which the first antenna can be installed is widened, the degree of freedom of arrangement is increased and the installation becomes easy.

Further, the same effect can be obtained by setting each antenna element as in the configuration example 1 of the antenna.

<Configuration 1 of wireless network construction device>
FIG. 6 shows a schematic configuration of the wireless network construction device according to the present invention. The wireless network configuration device arranges the first antenna 101 on the concrete wall opening surface 110-C facing the first space and within an allowable distance Dm from the concrete wall opening surface 110-B facing the second space. It is composed of a first wireless communication device 100 and a second wireless communication device 500 in which a second antenna 501 is installed in an area 301 having an allowable attenuation amount or less in the second space.

The first antenna 101 may exist on the concrete wall opening surface 110-A facing the first space as long as it is equal to or less than the allowable distance.

With the above arrangement, it is possible to wirelessly communicate between the first wireless communication device 100 and the second wireless communication device 500.

With the above configuration, it is possible to communicate between the shielded spaces and construct a part of the wireless network.

<Configuration 2 of wireless network construction device>
FIG. 8 shows a schematic configuration of the wireless network construction device according to the present invention. In addition to the configuration shown in FIG. 6, it has a positioning device 700. The position determination device 700 includes an imaging unit 701 that captures an image, a third wireless communication device that performs wireless communication with the first wireless communication device, and a position determination unit 703 that determines the optimum position of the first antenna. Will be done.

A wired communication unit may be provided instead of the third wireless communication device, and a wired communication unit may be added to the first wireless communication device to form a wired connection.

Hereinafter, it will be described as assuming that communication is performed by wireless communication.

In the first wireless communication device, the second wireless communication device, and the positioning device, the time is synchronized by NTP or the like.

Since the transmission loss in the concrete wall changes depending on the reinforcing bar structure in the concrete wall and the arrangement of the metal doors, the position of the first antenna needs to be adjusted on site.

Therefore, it is necessary to confirm the state of the electric power transmitted in the second space by the position of the first antenna.

The position determination unit 703 photographs a state in which the operator changes the temporary position of the first antenna by the imaging unit 701, and acquires the temporary position together with the time.

During this time, the positioning unit 703 continuously transmits data packets from the third wireless communication device 702 to the second wireless communication device via the first wireless communication device.

The second wireless communication device measures the received power by receiving the packet and returns it to the first wireless communication device together with the reception time. The first wireless communication device is the third wireless communication device 702. The received power and reception time are transferred.

The position determination unit 703 receives the received power and the reception time, and associates the temporary position and the received power with the position acquisition time and the reception time.

After acquiring the received power for all the temporary positions that may be optimal, the optimum position is shown.

<Wireless network system configuration>
FIG. 7 shows a configuration example of the wireless network system according to the present invention. The first antenna 101 is installed on the concrete wall opening surface 110-C at a permissible distance Dm or less from the concrete wall surface 110-B surface facing the second space, as in FIG. The wireless communication device 500-1 in which the second antenna 501-1 is installed in the area 301 that is equal to or less than the allowable attenuation in the second space, and the second in any place other than the area 301 in the second space In the wireless communication device 500-2 in which the antenna 501-2 is installed, and in the wireless communication device 500-3 in which the second antenna 501-3 is arranged at an arbitrary position other than the allowable distance Dm in the first space. It is composed. Through the wireless communication devices 100 and 500-1, a wireless network capable of communicating between the wireless communication devices 500-2 and 500-3 is obtained.

<Antenna configuration example 3>
FIG. 9 is a diagram showing an example of a more detailed connection structure between the metal door and the reinforced concrete wall. Reference numeral 901 is a metal plate for reinforcing concrete at the connection portion between the metal door and the concrete wall. Reference numeral 902 is a hinge portion for opening and closing the metal door, and reference numeral 903 is a shielding material for ensuring the airtightness between the first space and the second space. As described above, a link structure may exist between the concrete wall and the metal door. Since such a structure also affects the propagation of electromagnetic waves, it is necessary to model such a structure to determine the allowable distance.

The FDTD method is a method of obtaining an electric field and a magnetic field by directly expanding Maxwell's equations into difference equations in the space and time domains and performing sequential calculations. (KSYee, “Numerical solution of initial boundary value problem involving Maxwell's equations in isotropic media”, IEEE Trans. Antennas Propagatation, AP-14, no.3, pp.302-307, 1966.) Cut the space into small cells. , By assigning the permittivity, magnetic permeability, and conductivity of the object to the cells in the range where the object exists, and assigning the vacuum values to the other cells, the influence of the object on the propagation of the electric and magnetic fields is calculated. can do.

<Antenna configuration example 4>
FIG. 10 shows an example in which the second antenna 1001 and the second wireless communication unit 1002 are arranged in the second space. By installing 1001 within the range determined by the analysis, wireless communication can be performed between 1002 and the first wireless communication unit 102.

<Antenna configuration example 5>
FIG. 11 is a shield 1101 arranged on the reinforced concrete wall surfaces 110-A and 110-C around the first antenna. The purpose is to prevent the electromagnetic wave radiation from the first antenna from passing through the reinforced concrete and being re-radiated to the first space by the shielding by the metal body or the absorption effect by the radio wave absorber. The range of the shield 1101 is arranged at a position surrounding a range in which the electromagnetic wave radiated from the first antenna becomes stronger than a predetermined value at the boundary surface with the first space of the reinforced concrete wall.

By installing such a shield 1101, the first wireless communication device can communicate only with the second wireless communication device in the second space, and measures for cyber security can be achieved. Is possible.

Further, by similarly determining the installation range of the shield 1101 with respect to the strength of the electromagnetic wave radiated from the second antenna, the wireless communication device capable of communicating with the second wireless communication device is limited to the first wireless communication device. With the above configuration, it is possible to build a wireless network that connects the first space and the second space, which are shielded spaces from each other. It will be possible.

Further, in the vicinity of the metal door, the transmission distance of the concrete wall is shortened, and a propagation path that transmits with a small amount of attenuation can be used.

In addition, communication is possible by simply attaching the device to the structure of the building, and since large-scale drilling work is not required, installation is easy, and the opening near the door avoids interference with surrounding structures and is placed. Becomes easier.

In addition, the reflection of radio waves radiated from the antenna element from the wall surface is reduced, and more electric power can be incident on the wall surface.

Further, by setting the directional characteristic in which the direction in which the transmission distance of the wall is short is the main direction, more power can be radiated in the direction in which the amount of transmission attenuation is small.

In addition, it is possible to easily determine the installation position of the antenna element, which is least affected by the internal structure of the wall surface.

In addition, control lines and information lines are shown as necessary for explanation, and not all control lines and information lines are necessarily shown in the product. All configurations may be interconnected.

In addition, to those with ordinary knowledge in the art, other implementations of the invention will become apparent from the discussion of the specification and embodiments of the invention disclosed herein. The various aspects and / or components of the described embodiments can be used alone or in any combination in a computerized storage system having the ability to manage data. The specification and examples are merely exemplary, and the scope and spirit of the invention is set forth in the following claims.

100 Wireless communication device 101, 101-A, 101-1, 101-2, 101-3 First antenna element,
102 First wireless communication unit,
110 concrete wall,
111 rebar,
112 metal door,
110-A Concrete wall surface facing the first space,
110-B Concrete wall surface facing the second space,
110-C The opening surface of the concrete wall facing the first space,
110-D The opening surface of the concrete wall facing the second space,
201 Dielectric 301 Area where the allowable attenuation is less than or equal to the allowable attenuation in the second space 401 Power supply coefficient adjusting unit 500, 500-1, 500-2,500-3 Wireless communication device 501, 501-1,501-2,500- 3 Second antenna 700 Positioning device 701 Imaging unit 702 Third wireless communication device 901 Metal plate 902 Hinge part 903 Shielding material 1002 Second wireless communication unit 1101 Shielding material

Claims (12)

It is a wireless communication device that is placed in the first space on one side of a shield formed of a reinforced concrete wall and a metal object, and wirelessly communicates with the wireless communication device in the second space on the other side. The reinforced concrete wall has an opening penetrating from one side to the other, and the metallic object is arranged in the opening, from the metallic object in the opening to the reinforced concrete wall surface. have a first antenna arranged in any position, the transmission output of the wireless communication device, and the lowest reception sensitivity of the second wireless communication device that performs wireless communication device and wireless communication, and a reception margin A wireless communication device, characterized in that the first antenna is arranged at a specific position calculated from a calculated allowable damping amount, the allowable damping amount, and a damping rate of the concrete wall. In the wireless communication device according to claim 1 , the damping rate of the concrete wall shall be a value obtained by electromagnetic field analysis based on the reinforcing bar structure information including the thickness, pitch and depth of the reinforcing bars in the concrete wall. A wireless communication device characterized by. In the wireless communication device according to claim 1 or 2 , the first antenna has a structure covered with a dielectric having a relative permittivity equal to or higher than the relative permittivity of the concrete wall. The first antenna is a wireless communication device characterized in that it is determined based on the wavelength in the frequency band used in the dielectric. In the wireless communication device according to claims 1 to 3 , the first antenna is composed of two or more antenna elements, and the power supplied from the first wireless communication unit is distributed to the antenna elements. , A wireless communication device characterized by having a feeding coefficient adjusting unit that changes the feeding amplitude and feeding phase to specified values. In the wireless communication device according to claim 4 , the feeding amplitude and the feeding phase are radiated from each of the antenna elements in a direction from the first antenna toward a concrete wall surface facing the second space. A wireless communication device characterized in that the phases of wireless signals are determined to be aligned. In the wireless communication device according to claim 4 or 5 , the feeding amplitude and the feeding phase are each of the antenna elements in a direction from the first antenna toward a concrete wall surface facing the second space. A wireless communication device characterized by determining the maximum radiation direction of the synthetic radio signal of In the wireless communication device of claim 1, a metal plate arranged at a connection portion between the metallic object and the reinforced concrete wall, a hinge portion for opening and closing the metallic object, and a first space and a second space. A wireless communication device characterized by having a shielding material for ensuring airtightness between the two. The wireless communication device according to claim 1, wherein the wireless communication device has a shield material arranged on a reinforced concrete wall around the first antenna. It is a wireless communication device that is placed in the first space on one side of a shield formed of a reinforced concrete wall and a metal object, and wirelessly communicates with the wireless communication device in the second space on the other side. The reinforced concrete wall has an opening penetrating from one side to the other, and the metallic object is arranged in the opening, from the metallic object in the opening to the reinforced concrete wall surface. A first antenna arranged at any position, a first wireless communication unit connected to the first antenna, at least one or more second antennas, and connected to the second antenna. It is composed of a second wireless communication unit, the second antenna, and in the second space, and arranged in a range which can be the allowable attenuation, the power radiated from the first antenna , the received power received at the second antenna, a wireless network system, characterized in that within a distance of a specific so that the specified value or more, positioning the first antenna position. In the wireless network system according to claim 9, said first antenna position location, acquires a reception power of the second antenna, having a position determination unit that determines the antenna position of the first A wireless network system featuring. In the wireless network system according to claim 9, position determination unit includes an imaging unit for photographing the first antenna, a third wireless communication unit that performs a first radio communications device and the wireless communication It is characterized in that the received power value of the first antenna and the received power value of the second antenna are acquired by communicating the received power value of the second antenna via the first wireless communication device. Wireless network system. In the wireless network system of claim 9 , a metal plate arranged at a connection portion between the metallic object and the reinforced concrete wall, a hinge portion for opening and closing the metallic object, and a first space and a second space. A wireless network system characterized by having a shielding material for ensuring airtightness between and.

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