JP3035792B2 - Reflected radio wave attenuation wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall for attenuating a reflected radio wave for attenuating a reflected wave from a wall surface of an external radio wave.

[0002]

2. Description of the Related Art Various types of radio waves, such as TV radio waves, radio waves for telephones, radio taxis, hams, and other radio communications, are flying around an urban area. Therefore, depending on the urban environment, various types of radio interference are a problem. For example, a variety of unnecessary radio waves that are flying around may often be obstacles as a cause of a sudden malfunction of a personal computer or a malfunction of a precision machine.

[0003] In addition, as buildings in urban areas become higher and higher, TV radio interference occurs, which is becoming a socially important phenomenon. For example, the ghost phenomenon in which the TV screen is doubled or tripled not only causes discomfort to the viewer but also hinders the transmission of personal information.
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 in the building at a place far from the transmitting place or the periphery of the building.

[0004] Therefore, as a measure against such a TV radio wave interference, a system that predicts and measures mainly a shadow portion of a building from a direction in which a radio wave comes in and supplies it by a common receiving antenna by wire has conventionally been adopted.

[0005] In general, whether a flying radio wave is a necessary radio wave or an unnecessary radio wave depends on the use of a building. For this reason, it is necessary to take measures against electromagnetic shielding appropriate to the location environment. The radio wave absorption wall was created in response to such social demands.

The radio wave absorbing wall is intended to reduce the reflection pollution of radio waves by adopting the outer wall surface facing the direction in which the radio waves fly and the direction in which the radio waves are reflected.

[0007] In recent years, personal computers have become more compact than conventional types and have emerged as book types, and the introduction of computers and other OA equipment in offices has been remarkable. In such office, OA
In information handled by devices and the like, important information including confidential information is increasing. Therefore, if the OA equipment malfunctions under the influence of noise or the like, garbled information in the OA equipment occurs, or information leaks to the outside, the reliability of the system deteriorates. Has a significant impact on operations. In addition, OA equipment and the like are particularly susceptible to noise and have a problem that information leakage occurs due to surrounding radio waves.

Therefore, in order to protect electronic equipment such as OA equipment and medical equipment used in a building, a system in which a radio wave shielding material (reflecting material) or a radio wave absorbing material is arranged on the exterior of the building is important.

Hitherto, proposals have been made using radio wave reflecting materials on the exterior of buildings (for example, Japanese Patent Application Laid-Open Nos. 55-49797, 55-13600, and 56-1).
No. 5831, Japanese Unexamined Patent Publication No. 59-4696, etc.) and those using a radio wave absorbing material (for example, Japanese Unexamined Patent Publication No. 55-64114).
JP-A-56-3912, JP-A-59-4912
No. 696, etc.).

[0010]

However, a device using a radio wave reflection material can prevent radio waves from entering a building, but has a problem that radio interference due to reflection on a wall surface of the building cannot be eliminated. . Also, as a radio wave absorber,
Ferrite (Fe ₂ O ₃ ) is mainly used, but it is expensive and has a large specific gravity (about 5), so the weight of the wall itself increases, and the strength must be increased as a structure, and the structure becomes complicated. Problem arises. As a result, the workability is reduced and the construction cost is increased. In addition, since the radio wave absorbing material is inserted into the exterior wall, there are technical and external design problems.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a reflected radio wave attenuation wall for reducing a reflected radio wave using only a radio wave reflector without using a radio wave absorber.

[0012]

SUMMARY OF THE INVENTION To this end, the present invention provides a reflected radio wave attenuation wall for attenuating a reflected wave of an external radio wave on a wall surface. Composed of reflected radio waves on the line in front of the center of the concave shape, characterized by constituting a wall that attenuates reflected radio waves synthesized in opposite phase, the concave shape is a vertical or horizontal wave shape, inverted pyramid shape There is a feature.

[0013]

In the reflected wave attenuating wall of the present invention, a wave reflecting material is used to form a wall having a regular repetition of a concave shape, so that the reflected wave from the wall whose phase is inverted on the center line of the concave shape is synthesized. It is attenuated by being performed.

[0014]

Embodiments will be described below with reference to the drawings.
FIG. 1 is a view showing one embodiment of a reflected radio wave attenuating wall according to the present invention, wherein 1 is a radio wave reflecting material, 2 is a structural skeleton, and 3 is a general outer wall.

In FIG. 1, a structural body 2 is made of concrete or other ordinary structure, and a radio wave reflecting material 1 is made of glass, a metal plate, or AL on the surface of the structural body 2.
C, a conductive film, a metal mesh, or the like is used to form a wall surface composed of regularly repeated concave shapes.
The structural body 2 and the radio wave reflector 1 constitute an outer wall surface on the side from which radio waves arrive (radiation source), and attenuate reflected radio waves of the external radio waves.

The concave shape may be either a horizontal mountain type stripe as shown in FIG. 1B or a vertical mountain type stripe as shown in FIG. For the side not facing the radio wave transmission source, the general outer wall 3 is used, and the same general finishing material as that of the related art is used.

In the above configuration, the external radio waves A and B are reflected by the radio wave reflector 1 on the wall surface and are synthesized at a point AB on a line k in front of the center of the concave shape as shown in the figure. When the propagation distances of the external radio waves A and B with respect to the radio wave transmission source are equal, if the phases are reversed, they are combined at the point AB and become 0, and the radio waves close to this are considerably attenuated by the reflected radio wave attenuation wall of the present invention. be able to.

FIG. 2 is a view showing another embodiment of the reflected radio wave attenuating wall according to the present invention, in which the radio wave reflecting member 1 "is constituted by an inverted pyramid continuous type.

As the radio wave reflecting material used in the present invention, a material having a large reflectance is generally used except for ferrite used as a radio wave absorbing material. The relationship between the wall surface material and the reflectance is shown in the table below at a frequency of 150 MHz.

[0020] Glass is widely used recently, and there is high-performance heat ray reflective glass (sputtered glass). However, since it has a reflectance of about 70, it can be used as a radio wave reflector as it is.

It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, the concave shape was repeated by a plane,
It may be constituted by a curved surface such as an inverted cone or a parabolic curve.

[0022]

As is apparent from the above description, according to the present invention, since the reflected radio wave is attenuated by the radio wave reflecting material, radio wave interference can be prevented by using a general-purpose building material without using ferrite. In addition, since no ferrite is used, the weight can be reduced, and the size of the building structure can be reduced by the weight reduction. Therefore,
The cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a reflected radio wave attenuation wall according to the present invention.

FIG. 2 is a diagram showing another embodiment of the reflected radio wave attenuation wall according to the present invention.

[Explanation of symbols]

 1) Radio wave reflection material, 2) Structural body, 3) General exterior wall

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04B 1/92 E04H 9/14

Claims (3)

(57) [Claims] 1. A reflection radio wave attenuation wall for attenuating a reflection wave of an external radio wave on a wall surface, comprising a radio wave reflection material, comprising a regular repetition of a concave shape, and reflecting on a line in front of the center of the concave shape. A reflected radio wave attenuation wall comprising a wall for synthesizing radio waves and attenuating a reflected radio wave synthesized in opposite phase. 2. The reflected radio wave attenuation wall according to claim 1, wherein the concave shape is a vertical or horizontal wave shape. 3. The reflection radio wave attenuation wall according to claim 1, wherein the concave shape is an inverted pyramid shape.