JPH0974295A - Wall structure capable of reducing electromagnetic interference - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the main beam of reflected radio waves of broadcast radio waves arriving from a transmission antenna provided higher than a building to be directed downwards so as to reach easily to the surface of an area in the vicinity of the building by a method wherein a radio wave reflector buried in the outer wall of the building is mounted in a vertical position. SOLUTION: A radio wave interfere reduction wall 10 has such a structure that a sheathing material 14 through which radio waves penetrate easily is arranged at an outermost side, and a radio wave absorber 18 and a radio wave reflector 16 are successively disposed in this order inside the sheathing material 14. The reflecting surface of the radio wave reflector 16 is corrugated and composed of a large number of unit bodies 16a which are possessed of curved surfaces and combined like saw-teeth. The unit bodies 16a are so arranged as to face obliquely upwards. Radio waves arriving at a building are irregularly reflected from the radio wave reflector 16 and scattered, so that radio waves are restrained from being reflected concentrating in a certain direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to an outer wall portion of a building and the like, and is intended to reduce a reception obstacle such as a television broadcast caused by a broadcast electric wave reflected by the outer wall portion. Related to the wall structure.

[0002]

2. Description of the Related Art Conventionally, for example, a radio wave absorbing wall disclosed in Japanese Patent Publication No. 1-45238 has been known as a wall of a building capable of reducing reception obstacles such as television broadcasting caused by reflected radio waves.

The radio wave absorbing wall body has a pair of leg pieces protruding from the rear surface of a decorative block made of a material that transmits radio waves, and a ferrite type molded body for absorbing radio waves is fitted between the adjacent leg pieces. Wear, and the decorative blocks to which the ferrite-based molded body is fixed are arranged in parallel, and a reinforcing bar mesh also serving as a reinforcing bar and a reflector is disposed between the tip surfaces of the leg pieces of each block, Concrete is cast on the back surface of the block to form a PC plate, which is used as the outer wall of the building frame.

According to this radio wave absorbing wall body, when the incoming radio wave is reflected by the rebar mesh, it is transmitted through the ferrite type body twice before and after the reflection, and is absorbed. The strength of the wave can be weakened, and thus the reception obstacle range caused by this reflected wave can be narrowed.

[0005]

However, in such a conventional wall structure for reducing radio interference, when a PC plate to which this wall structure is applied is used as a curtain wall and is vertically attached to the outer wall portion of the building frame, The reflector embedded inside is also vertical. For this reason, the main beam of the reflected wave of the broadcast radio wave that arrives from the transmitting antenna, which is usually provided at a position higher than the building frame, is directed downward, and the reflected wave easily reaches the surface of the neighboring area. Therefore, although the radio wave reflected by the PC plate is attenuated by the ferrite molded body, there is a problem that it still causes a reception failure in the neighborhood of the building.

The present invention has been made in view of such conventional problems, and an object thereof is that it is difficult for a radio wave reflected by an outer wall of a building to reach the ground surface in a neighboring area, and thus a reflection obstacle range is possible. It is an object of the present invention to provide a wall structure that reduces radio interference that can be narrowed.

[0007]

In order to achieve such an object, the present invention provides a radio wave absorber inside an exterior material through which radio waves easily pass, and a radio wave reflector inside the radio wave absorber. In the wall structure for reducing the radio wave interference, the radio wave reflector is formed in a curved shape.

In the wall structure for reducing the radio wave interference of the present invention having the above structure, the radio wave passing through the exterior material is absorbed to some extent by the radio wave absorber, and the radio wave which is not completely absorbed by the radio wave absorber is reflected by the radio wave absorber. It is reflected by the body. Then, the radio wave reflected by the radio wave reflector is further absorbed by the radio wave absorber,
It is released from the exterior material. Therefore, the radio wave reflected by the outer wall is doubly absorbed by the radio wave absorber and its intensity is weakened, so that the reception obstacle range due to this reflected wave is narrowed.

Here, since the radio wave reflector is formed in a curved surface, the reflected radio wave reflected by the radio wave reflector is diffusely reflected and scattered, so that the reflected radio waves are concentrated and reflected in a certain direction. Are prevented. Therefore, in the building to which the wall structure is applied, it is possible to remarkably reduce the TV reception obstacle due to the reflected wave that affects the neighboring area.

[0010]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show an embodiment of a wall structure for reducing radio interference according to the present invention, FIG. 1 is a cross-sectional view of the radio interference reduction wall, and FIG. 2 is a high floor of a building to which the radio interference reduction wall is applied. 2 is a sectional view of the wall of FIG. 3, and FIG. 3 is an enlarged sectional view of part A in FIG.

That is, FIG. 1 shows a wall (radio interference reduction wall) 10 for reducing radio interference according to the present invention. The radio interference reduction wall 10 is a building constructed as a multi-storey building as shown in FIG. It is applied to 12 outer walls. In addition, in the portion shown in FIG. 2, the building 12 has beams 12a of a building frame,
A floor slab 12b, a ceiling 12c and a window portion 12d are disclosed.

As shown in FIG. 1, the radio wave obstruction reducing wall 10 is provided with an exterior member 14 on the outside through which radio waves can easily pass.
Inside the exterior material 14, the radio wave reflector 1 is placed at a predetermined distance.
6 is arranged, a radio wave absorber 18 is arranged outside the radio wave reflector 16 (on the side of the exterior material 14), and a gap is provided inside the radio wave reflector 16 to form the concrete 2
It is roughly configured by arranging 0s.

The radio wave reflector 16 is formed of a metal foil, a metal mesh or the like, and its reflection surface is formed by combining a large number of curved surface units 16a, 16a ... To be done. At this time, when the radio wave reflector 16 is a metal mesh body, the density of the mesh is set in advance according to the frequency band of the interference radio wave. In the illustrated example, the curved surface units 16a, 16a ... Are quadric surfaces, and the curved surface units 16a, 16a ... Are arranged so as to be oriented obliquely upward as a whole. Further, the radio wave absorber 18 arranged outside the radio wave reflector 16 is formed of a ferrite type molded body, and the surface of the ferrite type molded body on the exterior material 14 side is protected by the protective film material 22. Has become.

Here, in the illustrated example, the concrete 20 is preformed as a PC (precast concrete) plate, and a rectangular recess 20a is provided on the outer surface side of the concrete 20. The exterior material 14, the radio wave absorber 18, and the radio wave reflector 16 are attached in order.

Here, the protective film material 2 for the radio wave absorber 18
An appropriate gap may be provided between the outer surface 2 and the inner surface of the exterior material 14, or they may be adhered to each other and bonded by an adhesive. Further, a gap may be left as it is between the radio wave reflector 16 and the concrete 20, or may be filled with mortar or the like. When the protective film material 22 side of the radio wave absorber 18 is adhered to the exterior material 14, it is desirable to use a polymer adhesive as the adhesive.

Further, as shown in the drawing, the radio wave reflector 16 and the radio wave absorber 18 may be brought into close contact with each other and integrally bonded and bonded with an adhesive. In this case, the back surface side of the radio wave absorber 18 made of a ferrite-based molded body is formed in the quadric surface, and the radio wave reflector 16 made of a metallic mesh or a metal foil is joined along the back surface. To

Further, the ferrite type molded body of the radio wave absorber 18 is formed by subdividing the back surface into tiles each having a quadric surface, and the pieces are arranged on the back surface of the exterior material 14 and integrally bonded and joined. After that, the radio wave reflector 16 may be adhesively bonded to the back surface of the radio wave absorber 18 so as to be integrated into a panel shape.

When the exterior material 14, the electromagnetic wave absorber 18, and the electromagnetic wave reflector 16 are integrally formed into a panel shape as described above, when the concrete 20 is formed as a PC plate, its forming frame is formed. By inserting it inside, it can be easily integrated with the PC plate of the concrete 20.

In the wall structure for reducing the radio interference according to the present embodiment having the above structure, the radio interference reducing wall 10 is
It is formed by a C plate and is used as an outer wall. This PC plate is composed of an exterior material 14, a radio wave absorber 18, a radio wave reflector 16, and a concrete 20 which easily transmit radio waves from the outside to the inside. They are arranged in order. Therefore, first, the radio wave that has passed through the exterior material 14 is absorbed to some extent by the radio wave absorber 18 formed of a ferrite-based molded body, and the radio wave that cannot be completely absorbed by the radio wave absorber 18 is a metal foil or a metal mesh. It is reflected by the radio wave reflector 16 formed by the body. Then, the radio wave reflected by the radio wave reflector 16 is further absorbed by the radio wave absorber 18, and then passes through the exterior material 14 and is emitted. Therefore,
Radio waves reflected by the outer wall using the radio wave obstruction reducing wall 10 are doubly absorbed by the radio wave absorber 18, so that the intensity of the reflected wave can be weakened as much as possible.

By the way, in this embodiment, the radio wave reflector 1 is used.
Since the reflecting surface of 6 is formed by combining a large number of curved surface units 16a, 16a ... Which are recessed by being recessed toward the outside in a sawtooth shape, when the radio wave is reflected by the radio wave reflector 16, Is diffusely reflected and scattered, so that reflected radio waves are prevented from being concentrated and reflected in a certain direction. Further, in the present embodiment, since the curved surface units 16a, 16a ... Are arranged so as to be directed obliquely upward, the radio waves reflected by the curved surface units 16a, 16a .. Since the light is diffusely reflected, the building 12 to which the wall structure is applied can further significantly reduce the TV reception obstacle due to the reflected waves affecting the neighboring areas. The reflection surface of the radio wave reflector 16 does not necessarily need to be recessed to form the quadric surface in a concave shape. Conversely, even if the reflection surface is convexly formed to form a quadric surface, reflected radio waves can be effectively diffused and reflected.

Although the radio wave interference reducing wall 10 is constructed of the PC plate as described above, the present invention is not limited to this, and the radio wave interference reducing wall 10 is constructed by pouring concrete on site. It also includes the case of doing.

[0022]

As described above, in the wall structure for reducing radio wave interference according to the present invention, the outer wall is the exterior material, the radio wave absorber, and the radio wave reflector from which the radio waves pass easily from the outside to the inside. ， Because it will be arranged in order of concrete, first, the radio wave that passed through the exterior material is absorbed to some extent by the radio wave absorber, and the radio wave that was not completely absorbed by this radio wave absorber is reflected by the radio wave reflector formed into a curved surface. To be done. Then, the radio waves diffusely reflected by the curved radio wave reflector are further absorbed by the radio wave absorber and emitted from the exterior material. Therefore, the radio waves reflected by the outer wall are doubly absorbed by the radio wave absorber, and the intensity of the reflected waves is not only weakened as much as possible, but the radio waves are diffusely reflected by the radio wave reflector and scattered. Therefore, the reflected radio waves are prevented from being concentrated and reflected in a certain direction. Therefore, in the building to which the wall structure is applied,
It has an excellent effect that it is possible to remarkably reduce the television reception trouble due to the reflected wave which affects the neighboring areas.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a wall structure for reducing radio interference according to the present invention.

FIG. 2 is a cross-sectional view of a wall portion of a first-floor height portion showing an embodiment of a building to which a wall structure for reducing radio wave interference according to the present invention is applied.

FIG. 3 is an enlarged cross-sectional view of part A in FIG.

[Explanation of symbols]

10 Wall for Reducing Radio Wave Disorder 12 Building 14 Exterior Material 16 Radio Wave Reflector 16a Curved Single Surface 18 Radio Wave Absorber 20 Concrete 22 Protective Membrane Material

Claims (1)

[Claims] 1. A wall structure in which a radio wave absorber is disposed inside an exterior material through which radio waves easily pass, and a radio wave reflector is disposed inside the radio wave absorber to reduce radio wave interference. A wall structure that reduces radio interference by being formed into a curved surface.