JPH10317535A - Wave absorbing wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a durable wave absorbing wall which does not require any complicated process and is free from any variation in wave absorbing characteristics due to a displacement of magnetic substances (ferrite formed bodies) in the direction of gravity and any damage to a building even if some vibration due to an earthquake occurs or it is used outdoors for long time. SOLUTION: Magnetic substances 12 comprising ferrite formed bodies of which plan view is trapezoidal and has a uniform thickness are fixed to a wave absorbing wall 10, the upper and bottom sides of the magnetic substance in the direction of magnetic field component are specified as a long side and a short side, respectively, and arranged continuously in the direction of the magnetic field component and at intervals in the direction of field component. Also the ferrite formed bodies 12 are stuck to an external material 14, and formed integrally through concrete 18 with metallic reflecting materials 16 comprising building wall surfaces and reinforcements. In addition, the selfweight of the magnetic substances 12 is supported by a supporting surface formed on the concrete 18 with the field component directional side surface 12a of the trapezoidal ferrite formed bodies used as a frame surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave absorbing wall used as an outer wall of a high-rise building in order to prevent a ghost disturbance on a television screen caused by unnecessary reflected radio waves.

[0002]

2. Description of the Related Art As this kind of radio wave absorbing wall, as disclosed in Japanese Patent Publication No. 55-49798,
On a metal plate as a reflector, a ferrite molded body is arranged with a gap in the direction of the electric field component, and arranged continuously in the direction of the magnetic field component so as to cut off the electric field, so that the ferrite molded body is There has been known one that can sufficiently exhibit radio wave absorption characteristics while reducing the number of sheets used.

Further, Japanese Patent Publication No. 55-13600 discloses a technique for solving the problem of peeling of a magnetic plate, the problem of weather resistance and water resistance, and the problem of construction without deteriorating radio wave absorption characteristics. A magnetic plate such as ferrite having radio wave absorption characteristics is fixed to the surface of a building material, such as a concrete or mortar, in which a radio wave reflector such as a reinforcing bar, a metal, and a metal plate is embedded, and the surface of the magnetic plate. Which is provided with an exterior material such as mortar.

FIG. 12A is a partially cutaway front view showing the structure of a radio wave absorbing wall 30 conventionally used, and FIG. 12B is a sectional view thereof. Conventional radio wave absorption walls
A metal reflector 16 of mesh reinforcement is buried in concrete 18, and a ferrite molded body 32 having a rectangular parallelepiped shape is formed almost continuously in the direction of the magnetic field component of the arriving radio wave (indicated by the arrow H in the figure) and the electric field component. In the direction (indicated by the direction of the arrow W in the drawing), a plurality of members are arranged and embedded at appropriate intervals, and the exterior material 14 is arranged on the outermost layer of the radio wave arrival surface. In such a conventional radio wave absorption wall, the ferrite molded body is usually buried directly in a building material such as concrete or buried through an adhesive, and its radio wave arrival surface is covered with an exterior material. It was a target.

When such a radio wave absorbing wall is used outdoors, it is considered that the radio wave arriving surface may rise to a maximum of about 80 ° C. due to sunlight or the like, and the ferrite molded body and concrete have different thermal expansion coefficients. There is a possibility that the position of the ferrite molded body may be shifted. In addition, even if an adhesive is used, there is a possibility that water resistance and heat resistance may be problematic in view of long-term outdoor use, which is insufficient in terms of safety and reliability.

[0006] From the viewpoint of radio wave absorption performance, the ferrite molded body is arranged at intervals in the direction of the electric field component of the arriving radio wave and is continuously coupled in the direction of the magnetic field component of the arriving radio wave. Do not adhere to each other, unless a means to support the own weight of the ferrite molded body is taken, the ferrite molded body connected continuously in the direction of gravity will fall in the same direction, and the radio wave absorption characteristics will change, It is possible that the building with the absorbing wall may be damaged.

As a method of supporting the weight of the ferrite molded body, for example, a method of binding the ferrite molded body to a metal reflector such as a reinforcing bar with a binding wire for each sheet has been adopted.
Construction is complicated and troublesome. In addition, a method of fixing the ferrite molded body to the wall body with a holding hardware, an anchor bolt, or the like has been proposed. However, according to this method, a metal surface that is a radio wave reflector protrudes from the front surface of the ferrite molded body that is a radio wave absorber. hand,
This impairs the electromagnetic wave absorption performance of ferrite.

[0008] Therefore, a method has been proposed in which the shape of the ferrite molded body or the holder is changed to secure the fixing. For example, Japanese Patent Publication No. 1-45238 discloses that a ferrite molded body is fitted to an exterior material (decorative block) provided with a plurality of projecting legs for fitting the ferrite molded body, and a back surface thereof is A configuration in which concrete is integrally mounted is disclosed. According to this method, complicated steps such as forming a block having a complicated shape, fitting a tile to the block, and fixing the block to concrete are required. Further, Japanese Patent Publication No. 2-7199 discloses a ferrite molded body molded to have a modified cross section or an uneven or rough surface portion so as to increase the adhesion area with concrete. However, in view of the fact that the adhesiveness between the ferrite molded body and the concrete is not sufficient, the means for supporting the own weight of the ferrite molded body continuously connected in the direction of the magnetic field component is insufficient.

[0009]

According to the structure of the conventional radio wave absorbing wall as described above, the ferrite and the building material holding the ferrite have different thermal expansion coefficients and the ferrite has a large weight. In order to obtain a solid bonding strength with concrete, it has been desired to improve the shape of the ferrite molded body in consideration of measures to support its own weight continuously coupled in the direction of the magnetic field component of the arriving radio wave.

[0010] In particular, in addition to durability in normal use, even when stress is applied to the radio wave absorption wall due to a disaster such as an earthquake, the ferrite molding which is continuously installed in the direction of the magnetic field component, that is, in the direction of gravity. There was a need for a method to reliably prevent the body from slipping in the same direction, changing the radio wave absorption characteristics, and damaging the building.

That is, an object of the present invention is to reduce the change in radio wave absorption characteristics due to the deviation of the ferrite in the direction of gravity without the need for complicated processes, and even when subjected to vibrations caused by earthquakes or long-term outdoor use. Another object of the present invention is to provide a durable radio wave absorption wall without damaging the building.

[0012]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in view of the above problems, and have found that even if the cross-sectional shape in the direction of the electric field component is deformed in order to increase the adhesion area of the ferrite molded body to concrete, Since the cross section in the direction of gravity is the same, there is a limit in preventing slipping in the direction of gravity, and the ferrite molded body has a frame surface that can form a support surface for supporting its own weight in concrete in the shape of the ferrite molded body itself As a result, it has been found that this deviation can be effectively prevented, and the present invention has been completed.

That is, the radio wave absorbing wall of the present invention is a radio wave absorbing wall in which a magnetic material typified by a plurality of ferrite moldings is fixed to concrete, and the magnetic material is disposed inside the concrete. Characterized in that a frame surface having a shape forming a support surface for supporting the own weight is provided, and an exterior material is mounted on the radio wave arrival surface.

It is preferable that the magnetic body has a frame surface of the above shape on the side surface in the direction of the electric field component of the arriving radio wave, and it is preferable that the planar shape of the magnetic body be a trapezoid.

In the radio wave absorbing wall of the present invention, the magnetic material (for example, a ferrite molded body), which is a radio wave absorbing material, abuts on concrete, preferably on the side surface, and supports the weight of the magnetic material inside the concrete. By providing a frame surface that forms a supporting surface for the concrete, mortar, etc. that comes into contact with it, hardens in a state in which the magnetic material is fitted, and as a result, the supporting surface is firmly supported. In addition, it is possible to prevent a magnetic body such as a ferrite molded body arranged continuously in the direction of gravity from moving in the same direction. As a result, even if an earthquake occurs, no displacement or tile drop occurs, and a secure and durable radio wave absorbing wall having a strong configuration can be provided.

Further, with the above configuration, it is possible to provide an inexpensive radio wave absorbing wall which is easy to manufacture with a simple configuration without requiring special members or a complicated configuration.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A radio wave absorbing wall according to the present invention will be described with reference to the drawings.

FIG. 1A is a partially broken front view showing a radio wave absorbing wall 10 according to a first embodiment of the present invention, which will be described later.
2B is a cross-sectional view in the direction of the electric field component of the radio wave arriving at the radio wave absorption wall 10. A magnetic body 12 made of a ferrite molded body is fixed to the radio wave absorbing wall 10. The magnetic body 12 has a trapezoidal planar shape and a uniform thickness. , H in the direction of the arrow), the upper base is a long side, and the lower base is a short side. It is arranged with a gap.

The ferrite molded body 12 is made of a porcelain tile or an exterior material 14 made of a large-sized material such as a plate-shaped stone.
Is bonded by an adhesive made of an elastic epoxy resin, and is integrated with a building wall (not shown) and a metal reflector 16 made of a reinforcing steel by concrete 18.

The weight of each of the ferrite moldings 12 is shown in FIG.
As shown in (A), the side surface 12a of the trapezoidal ferrite molded body in the electric field component direction is supported by the abutting concrete 18. That is, after the ferrite molded body 12 is integrated with the exterior material 14 and the metal reflecting material 16 by the concrete 18 and the building material is hardened, the ferrite molded body 12 is fitted into the concave portion formed in the concrete 18. Since the sloped side surface 12 of the ferrite molded body 12 becomes a frame surface and the sloped ferrite molded body 12 support portion is formed on the concrete 18, the ferrite molded body 12 and the concrete 18 are formed by heating or applying stress. Even if the adhesion between
The ferrite molded body 12 is used as a frame surface to be locked by a supporting portion formed on a corresponding portion of the hardened concrete 18 for supporting its own weight, thereby effectively preventing displacement in the direction of gravity. is there.

The ferrite molded body described here is generally used as the magnetic material of the radio wave absorbing wall. As a material for the ferrite molded body, any suitable ferrite having a known composition can be used. Ferrite, Ni
-Cu-Zn ferrite, Mn-Zn ferrite,
What is necessary is just to select suitably Mn-Cu-Zn ferrite etc. according to a use, absorption characteristic, etc. Preferably, 30 to 40
% Ni-1 to 10% Cu-10 to 15% Zn-based sintered ferrite or 15 to 20% Mg-3 to 10% Cu-25 to 3
0% Zn-based sintered ferrite and the like.

FIG. 2 is a perspective view showing the ferrite molded body 12 used for the radio wave absorbing wall 10 shown in FIG. As shown in FIG. 2, a case where the side surface of the ferrite molded body 12 in the direction of the electric field component forms a slope that functions as a frame surface as a whole, that is, a trapezoidal shape is shown. When the tiles 12 are arranged on the radio wave absorbing wall 10, the upper base of the ferrite molded body 12 in the magnetic field component direction is set to a long side and the lower base is set to a short side. The weight of the molded body 12 is supported. As described above, the side surface (frame surface) in the direction of the electric field component is not limited to the slope, as long as the ferrite molded body 12 is supported in the recess formed as a result in the building material such as solidified concrete. , A step shape, a curved shape, a combined use with an uneven portion, and the like can be appropriately selected. The preferred dimensional ratio can be appropriately selected depending on the gap length in the electric field direction between the ferrites, the ferrite material, the incident angle of radio waves, and the like. Generally, the height is H, the width of the long side is W ¹ , When the width of the side is W ² and the thickness is T, H = 100 mm, W ¹ = 50 to 150 mm, W ²
= 50 to 145 mm (W ¹ −W ² = 5 to 15 mm
Degree), and T is preferably 5 to 13 mm.

As for the shape of the magnetic material (ferrite molded product), a support surface for supporting the weight of the magnetic material in the concrete by forming a frame surface with respect to the concrete on a contact surface of a building support material such as concrete. It is characterized in that it has a surface on which a surface can be formed, and examples of the planar shape shown in FIG. 2 other than those having a trapezoidal shape include shapes shown in perspective views in FIGS. 3 to 7 and 9. Can be

The ferrite molded body 20 shown in FIG. 3 is provided with one projection 20a on each side surface in the direction of the electric field component. The projecting portion 20a fits into the concrete and functions as a frame surface, and the so-called concave portion of the concrete with which the projecting portion 20a comes into contact fits with the projecting portion and supports the own weight of the magnetic body 20. The weight of the molded body 20 in the direction of gravity is supported by the concave portion which is a fitting portion of the ferrite molded body 20 formed on the concrete and is stably held. The shape of the protruding portion is not limited to a rectangular shape as shown in FIG.
As shown in FIGS. 4A, 4B, and 4C, the shape and size are particularly limited as long as the support surface capable of holding the magnetic material can be a frame surface formed in concrete. However, it can be appropriately selected according to the configuration of the radio wave absorbing wall.

The size of the magnetic material varies depending on the gap length in the electric field direction between the ferrites, the material of the ferrite, the incident angle of radio waves, and the like. For example, as shown in FIG. In general,
The height (H), width (W), and thickness (T) are H = 100 m
m, W = 50 to 150 mm, and T = 5 to 13 mm.

FIG. 5 is a perspective view showing an example of a ferrite molded body 22 having a concave portion formed on a side surface. As shown in FIG. 5, the ferrite molded body 22 is provided with one concave portion near the center in the height direction of the side surface in the tile electric field component direction. By integrating the tile 22 with concrete, the concave portion is filled with concrete, and the weight of the ferrite molded body 22 is supported by the concrete supporting surface abutting on the upper end surface 22a of the concave portion.

The portion to be the frame surface of the ferrite molded body is not limited to one location on each side surface in the direction of the tile electric field component, and may be arranged at a plurality of locations, or may be a mixture of convex portions and concave portions. Good. FIG. 6 shows an example of a tile in which convex portions and concave portions are formed in a mixed manner.

A plurality of ferrite compacts are arranged continuously in the direction of the magnetic field component.
By changing the dimension of the connection portion in the direction of the electric field component (for example, the dimension of the upper side and the lower side), a frame surface on the side surface in the direction of the electric field component can be formed. One example is the trapezoidal planar shape described above.

As shown in the perspective view of FIG. 7, there can be mentioned a ferrite molded body 24 having a concave portion formed at the lower end of the side surface. In this way, by forming a part of the connection portion (lower end) of the continuous ferrite molded body as a concave portion, concrete is filled between the concave portion and the adjacent ferrite molded body, and the upper surface 24b of the concave portion is filled with concrete. The contacting concrete serves as a support surface, and the weight of the ferrite molded body 24 is supported.

Also, the same effect can be obtained for the ferrite molded body having the trapezoidal planar shape shown in FIG. 2 if the upper end in the direction of gravity is arranged as the shorter side of the trapezoid.

FIG. 8 shows a plurality of trapezoidal ferrite compacts 12.
With the upper base as the short side and the lower base as the long side in the magnetic field component direction,
FIG. 5 is a front view, partially broken, showing a radio wave absorbing wall 26 that is continuous in the direction of the magnetic field component and is disposed with a gap in the direction of the electric field component. Here, on the long side of the ferrite molded body 12, the surface 12 b that is not connected to the adjacent ferrite molded body comes into contact with the concrete 18 to form a frame surface, so that a supporting surface capable of supporting the own weight of the ferrite molded body 12. Is formed on the concrete 18.

Further, in addition to the trapezoidal shape shown in FIG. 2, even when the planar shape of the ferrite molded body 28 is a hexagonal shape as shown in FIG. Similarly, the objects of the present invention can be achieved.

Further, among the abutting surfaces with the concrete, the ferrite molded body whose side surface is the frame surface has a uniform thickness (T), and is taken into consideration by taking into account the mold used for pressing the tile. Any shape can be easily manufactured.

Further, as shown in the perspective view of FIG. 10, a projection may be provided on the ferrite molded body having such a trapezoidal planar shape on the surface opposite to the exterior material mounting surface. In this way, by providing the support surface not only on the side surface but also on the other joint surface, it is possible to obtain a radio wave absorbing wall having a more durable and stable configuration in addition to the support by the side surface.

Further, as shown in FIG. 11, by providing a concave portion on the same surface, concrete is filled in the concave portion, and the same effect can be obtained.

As described above, the surface on which the exterior material is mounted is preferably flat from the viewpoint of adhesion, but the surface opposite to the exterior material mounting surface may be arbitrarily set as shown in FIGS. A concave portion and / or a convex portion forming a frame surface can be provided. The shape of the frame surface is not limited to the illustrated shape, and the shape, size, and the like can be appropriately selected according to a desired radio wave absorption wall.

Further, as described in JP-A-8-105128, a plurality of through-holes are opened in the thickness direction of the ferrite molded body, and the through-hole is filled with a building material or an adhesive for bonding the ferrite molded body and the exterior material. By using such means in combination, it is possible to further improve the holding durability between the ferrite molded body and the building material and effectively prevent peeling and peeling of the exterior material.

As described above, the shape of the magnetic material may be any shape provided that at least a part of the contact surface with the concrete has a frame surface capable of forming a support surface for effectively supporting its own weight. Although there is no particular limitation, such as a uniform thickness, a trapezoidal planar shape, a hexagonal shape and a concave portion formed at the lower end of the side surface as shown in FIG. Although it can be said, on the premise of securing radio wave absorption performance,
Considering the accuracy, productivity, and economy of the product, it is considered that the one having a uniform thickness and a trapezoidal planar shape is most desirable.

The radio wave absorbing wall of the present invention is characterized by the shape of the magnetic material. When constructing the radio wave absorbing wall by using these ferrite moldings, the tile is moved in the direction of the electric field component according to a conventional method. They are arranged with an appropriate gap, and the porosity is appropriately selected according to the dimensions of the ferrite molded body. The thickness of the ferrite molded body is also selected in accordance with the material and dimensions of the ferrite molded body and the required electromagnetic wave absorption performance, similarly to the porosity in the direction of the electric field component.

As the exterior material to be attached to the radio wave arrival surface of the ferrite molded body, a flat molded body is preferably used, and as the material, there are stone, tile, concrete, mortar and the like. Good.

When the ferrite molded body is bonded to a building material such as an exterior material and concrete, it is used for building materials and metals such as vinyl acetate resin, polyester resin, silicone resin, and elastic epoxy resin. Adhesion using a suitable back surface treatment material exposes the radio wave absorption wall to high temperatures, and even if the ferrite molded body is distorted due to the difference in thermal expansion coefficient with concrete or exterior materials, the strain is absorbed by the back surface treatment material. Therefore, the safety of the radio wave absorption wall can be secured.

In the present invention, concrete is
In addition to general concrete, it also includes structural materials for exterior walls such as mortar, but also includes concrete fibers, exterior fiber materials such as mortar, carbon fiber, conductive fiber reinforced concrete including metal fibers, glass fiber, Non-conductive fiber reinforced concrete or the like containing vinyl fiber or the like can also be suitably used. By using concrete containing these reinforcing materials, it is possible to obtain a radio wave absorbing wall having higher strength for high-rise buildings.

In these building materials, there are embedded metal aggregates for reflection, such as reinforcing bars, mesh reinforcing bars (wire mesh), metal plates, reinforcing bars, and the like, which are commonly used for radio wave absorbing walls. Any of these can be used.

[0044]

EXAMPLE As a magnetic material, a ferrite molded body having a trapezoidal planar shape as shown in FIG. 2 (H = 100 mm, W ¹ = 116 m)
m, W ² = 106 mm, T = 9.5 mm: Ni—Cu—
Made of Zn-based sintered ferrite).

As an exterior material, a ceramic tile (H =
689 mm, W = 697 mm, T = 13 mm) are prepared, and a predetermined number of them are arranged and an elastic epoxy resin-based adhesive (manufactured by Yokohama Rubber Co., Ltd.,
Eposoft F) was applied.

A predetermined number of the ferrite compacts were continuously arranged in the direction of the magnetic field component of the incoming radio wave, and a plurality of the ferrite compacts were arranged at intervals of 60 mm in the direction of the electric field and adhered to the magnetic tile. After disposing a metal aggregate for radio wave reflection in a frame material prepared by an ordinary method, concrete as a building material was filled in the frame material and cured to obtain a radio wave absorbing wall of Example 1. After the concrete has hardened, the ferrite molded body is stably supported by its own weight in the concave portion of the concrete formed by the trapezoidal slope.

As described above, the radio wave absorbing wall of the present invention is provided by providing a supporting portion for supporting its own weight on the contact surface of the ferrite molded body, which is a radio wave absorbing material, with a building material such as concrete or mortar. The building material in contact therewith supports the own weight of the ferrite molded body, so that the ferrite molded bodies continuously arranged in the direction of gravity can be prevented from moving in the same direction. Thus, it was found that a secure and durable radio wave absorbing wall having a strong configuration can be provided which does not cause displacement or dropping of the ferrite molded body.

[0048]

The radio wave absorbing wall of the present invention does not require any special member or complicated structure, is easy to manufacture with a simple shape, is inexpensive, and can be made of a magnetic material even after an earthquake or long-term use. There was no change in radio wave absorption performance or damage to the building due to misalignment, and the effect was excellent in durability.

[Brief description of the drawings]

FIG. 1A is a partially cutaway front view showing a radio wave absorbing wall according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view in the direction of an electric field component of an incoming radio wave.

FIG. 2 is a perspective view showing a trapezoidal magnetic body (ferrite molded body) used in the radio wave absorption wall of the first embodiment.

FIG. 3 is a perspective view showing a magnetic body provided with one protrusion on each side surface in the direction of the electric field component.

FIGS. 4A, 4B, and 4C are partial perspective views showing examples of the shape of a protrusion formed on a magnetic body.

FIG. 5 is a perspective view showing an example of a magnetic body having a concave portion formed on a side surface.

FIG. 6 is a perspective view showing an example of a magnetic body in which a convex portion and a concave portion are mixedly formed on a side surface.

FIG. 7 is a perspective view illustrating an example of a magnetic body in which a concave portion is formed at a lower end of a side surface.

FIG. 8 is a partially broken front view showing a radio wave absorbing wall in which a plurality of trapezoidal magnetic bodies are arranged with the upper base as the short side and the lower base as the long side in the magnetic field component direction.

FIG. 9 is a perspective view illustrating an example of a magnetic body having a hexagonal planar shape.

FIG. 10 is a perspective view showing a state in which a protrusion is provided on a surface of the magnetic material having a trapezoidal planar shape opposite to the surface on which the exterior material is mounted.

FIG. 11 is a perspective view showing a state in which a concave portion is provided on a surface of the trapezoidal magnetic body opposite to the exterior material mounting surface of the trapezoidal magnetic body.

FIG. 12 is a partially broken front view showing an example of a conventionally known radio wave absorbing wall in which a rectangular magnetic body is arranged, and FIG.
Is a sectional view in the direction of the electric field component of the arriving radio wave.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 radio wave absorbing wall 12 magnetic body (ferrite molded body having a trapezoidal planar shape) 12 a side surface of magnetic body 14 exterior material (tile, etc.) 16 metal reflector (reinforcing bar) 18 concrete 20 protrusions (convex portions) are formed on side surfaces Magnetic body (ferrite molded body) 20a Projection formed on magnetic body (ferrite molded body) 22 Magnetic body (ferrite molded body) having concave on side surface 22a Recess formed on magnetic body (ferrite molded) Top surface 24 Magnetic body (ferrite molded body) formed with a mixture of protrusions and recesses on side surfaces 24b Lower end surface of long side not in contact with adjacent magnetic body (ferrite molded body) 26 Radio wave absorption wall 12b Adjacent magnetism The lower end face of the long side that does not contact the body (ferrite molded body) 28a hexagonal magnetic body (ferrite molded body) 28a Lower side 30 Conventional radio wave absorption wall 32 Rectangular magnetic body (ferrite molded body)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiji Yamazaki 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor Jinko Minato 8-21 Ginza, Chuo-ku, Tokyo No. 1 Inside Takenaka Corporation Tokyo Main Store (72) Inventor Yasuo Kanda 8-21-1, Ginza, Chuo-ku, Tokyo Inside Tokyo Main Store Takenaka Corporation (72) Inventor Kenichi Harakawa Inzai City, Chiba Prefecture 1-5-1, Otsuka 1 Takenaka Corporation Technical Research Institute, Inc. Toshitaka 2-15-17 Egawa, Shimamoto-cho, Mishima-gun, Osaka Sumitomo Special Metals Co., Ltd.

Claims (3)

[Claims] 1. A radio wave absorbing wall comprising a plurality of magnetic bodies fixed to concrete, wherein the magnetic bodies form a support surface for supporting the weight of the magnetic bodies inside the concrete. A radio wave absorption wall having a surface and an exterior material attached to a radio wave arrival surface. 2. The radio wave absorbing wall according to claim 1, wherein said magnetic body has said frame surface on a side surface in a direction of an electrolytic component of an incoming radio wave. 3. The radio wave absorbing wall according to claim 1, wherein the planar shape of the magnetic body is a trapezoid.