JPH05187077A - Radio trouble countermeasure wall - Google Patents

Abstract

PURPOSE:To ensure the high efficiency of a wave absorbing material without using ferrite directly for an outer wall. CONSTITUTION:A radio trouble countermeasure wall removes a radio trouble owing to reflection of radio waves by a building and is provided with a wall 2 formed of a radio absorbing material built inside a window glass 1 in a direction extending at right angles with a radio direction. Thereby, radio absorbing efficiency can be maintained at a high value regardless of the direction of the building. Further, since the radio trouble countermeasure wall is not built at an outer wall but inside the building, execution of works is facilitated and a cost is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave obstacle prevention wall using ferrite as an electric wave absorber as a radio wave obstacle for a building.

[0002]

2. Description of the Related Art Various types of radio waves, such as TV radio waves, radio waves for telephones, wireless taxis, hams, and other wireless communications, are scattered in urban areas. Therefore, various radio wave interference is a problem depending on the urban environment. For example, various unnecessary radio waves that are flying around are often obstacles to the cause of sudden malfunction of a personal computer or malfunction of a precise machine.

In recent years, personal computers have become more compact than the conventional type and have come to the book type, and the introduction of computers and other office automation equipment in offices is remarkable. In such office, OA
A large amount of important information including confidential information is handled as information handled by devices and the like. Therefore, if the OA device malfunctions due to the influence of noise or the like, the information in the OA device malfunctions, or the information leaks to the outside, the system reliability decreases. , Seriously affect business. In addition, in particular, OA devices and the like are susceptible to noise, and there is a problem that information leakage due to surrounding radio waves occurs.

Further, as the number of buildings in urban areas has become higher, TV radio wave interference has occurred, and it is becoming a social issue. For example, the ghost phenomenon in which the TV screen appears in double or triple causes not only an unpleasant feeling for the viewer but also a problem that the personal information transmission is hindered.
This is an obstacle caused by the reflection of radio waves from the building. Such radio interference is likely to occur when there is not much difference between the electric field strength of the direct wave and the electric field strength of the reflected wave of the building at a place where the signal is transmitted and a place far away from the periphery of the building.

However, the radio interference caused by a building requires enormous cost to eliminate it depending on the affected area. In particular, with regard to TV interference, there are two major obstacles: "shadow of the building" and "reflection of the building." Up to now, one using a radio wave reflection material on the exterior of a building (see, for example, JP-A-55-497).
97, JP-A-55-13600, JP-A-5
No. 6-15831, JP-A No. 59-4696, etc.) and those using a wave absorber (for example, JP-A No. 55-6).
4114, JP-A-56-3912, JP-A-59-4696, etc.) have been proposed.

The radio wave absorption wall is intended to reduce the reflection pollution of radio waves by being adopted as an outer wall surface facing the direction of arrival of radio waves and the direction of reflection of radio waves.

FIG. 2 is a view for explaining a conventional example of a radio wave obstacle protection wall using a radio wave absorber. Generally, ferrite (Fe ₂ O ₃ ) having a specific gravity of about 5 is used as a radio wave absorber as a measure against radio wave interference, and as a result, a radio wave absorber of ferrite 12 is arranged in concrete 11 as shown in FIG. Often the outer wall is constructed.

[0008]

However, when ferrite is used as a radio wave absorber for countermeasures against radio wave interference, there is a problem that ferrite cannot be directly exposed to the outer wall because the radio wave absorption performance of ferrite changes when it contains water. Therefore, generally, as shown in FIG. 2, the ferrite 12 is covered with concrete 11 or stone having a thickness of about 20 mm, or the ferrite is built into the PC plate. There is.

Therefore, a part of the radio wave is reflected by a member such as concrete covering the ferrite, the efficiency as a radio wave absorber is lowered, and the cost of the outer wall is made very high. Further, since the orientation of the building is usually determined regardless of the radio wave direction, the surface of the outer wall made of ferrite is not always oriented at right angles to the radio wave direction as shown in FIG. In that respect, it also reduces the electromagnetic wave absorption efficiency.

The present invention is to solve the above problems, and an object of the present invention is to provide a radio wave obstruction countermeasure wall which can secure high efficiency as a radio wave absorber without directly using ferrite on the outer wall. Is to

[0011]

To this end, the present invention provides a radio wave obstruction countermeasure wall for eliminating radio wave obstruction due to reflection of radio waves from a building, in which a radio wave absorber is provided inside a window at right angles to the radio wave direction. It is characterized in that a wall made of is provided.

[0012]

In the radio wave interference countermeasure wall of the present invention, since the wall made of the radio wave absorber is provided inside the window at right angles to the radio wave direction, the radio wave absorption efficiency can be maintained high regardless of the orientation of the building. Further, since it is provided not inside the outer wall but inside the building, the construction is easy and the cost can be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing one embodiment of a radio wave interference countermeasure wall of the present invention, in which 1 is a window glass, 2 is a radio wave absorbing wall, and 3 is a partition wall.

In FIG. 1, a window glass 1 is provided on the outer wall surface of a building, and a radio wave absorption wall 2 is provided inside a window of the building in a direction perpendicular to TV radio waves from one direction. It is a wall made of ferrite. The partition wall 3
A plywood or a decorative plate that transmits radio waves is used, and forms a partition space such as a conference room near the window together with the radio wave absorption wall 2.

As described above, when the radio wave absorption wall 2 made of ferrite is provided inside the window glass of the building in a direction perpendicular to the radio wave direction, the window glass 1 transmits the radio wave with almost no reflection, so that the radio wave is absorbed. The wall 2 can absorb radio waves with high efficiency. In addition, it is arranged inside the window glass 1 at an appropriate distance, and is further partitioned by the partition wall 3 to make it as shown in FIG.
By creating a constant space as in (a) and (b), the space between the window glass 1 and the electromagnetic wave absorbing wall 2 can be used as a meeting room, a hot water supply room, or the like. That is, the radio wave absorption wall 2 can also be used as a part of the partition wall near the window.

Normally, the orientation of the building is determined independently of the radio wave direction. Therefore, if you arrange the ferrite inside the outer wall to construct the electromagnetic wave absorption wall as in the conventional case, the ferrite will enter the outer wall parallel to the direction of the building,
The surface of the ferrite is often not perpendicular to the radio wave direction, and the radio wave absorption efficiency of the ferrite usually decreases.

On the other hand, in the radio wave interference prevention wall of the present invention, the radio wave absorption wall is provided inside the window glass at right angles to the direction of the radio wave regardless of the orientation of the building, so that high absorption efficiency can be obtained. it can.

Further, in a building such as a recent building in which the area of the window glass occupying the outer wall surface is large, the electric wave absorbing wall of the present invention can be provided inside the window even if the outer wall is not composed of the electric wave absorbing wall. Sufficient radio wave absorption efficiency can be obtained.

The present invention is not limited to the above embodiment, but various modifications can be made. For example, in the above embodiment, ferrite was used as the radio wave absorber, but it goes without saying that other radio wave absorbers may be used.

[0020]

As is apparent from the above description, according to the present invention, since a ferrite wave absorbing wall is provided inside the window in a direction perpendicular to the radio wave direction, a large wave absorbing efficiency can be obtained. Further, since the electromagnetic wave absorption wall is provided inside the window, the arrangement position may be changed for each floor, and it is possible to design and plan a building with a free appearance without being restricted by the design of the outer wall. Moreover, the electromagnetic wave absorbing wall is easier to construct than the outer wall, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing one embodiment of a radio wave interference countermeasure wall of the present invention.

FIG. 2 is a diagram for explaining a conventional example of a radio wave obstacle countermeasure wall using a radio wave absorber.

[Explanation of symbols]

 1 ... Window glass, 2 ... Electromagnetic wave absorption wall, 3 ... Partition wall

Claims (1)

[Claims] 1. A radio interference barrier for eliminating radio interference caused by reflection of radio waves from a building, wherein the wall of the radio wave absorber is arranged inside the window glass at a right angle to the radio wave direction. The characteristic barrier against electromagnetic interference.