JP2521031Y2 - Radio wave absorption wall - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave absorption wall that absorbs external radio waves that cause radio interference.

[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.

Also, as the number of buildings in urban areas rises, TV radio wave interference occurs, and it is becoming a social issue. For example, the ghost phenomenon in which the TV screen appears double or triple has the problem of not only giving viewers an unpleasant feeling but also obstructing the transmission of personal information.
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 at the building at a place far away from the place of transmission and the periphery of the building.

Therefore, as a countermeasure against such TV radio wave interference, conventionally, a system has been adopted which mainly predicts and measures the shadow portion of a building from the direction in which radio waves fly and supplies the shadow portion of a building via a shared reception antenna.

[0005] Generally, whether the flying radio waves are required or not required depends on the purpose of the building. Therefore, it is necessary to take electromagnetic shielding measures suitable for the location environment in the building. The electromagnetic wave absorbing wall was created by the demands of society.

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.

In recent years, personal computers have become more compact than conventional types 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. Moreover, 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.

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

Up to now, as a proposal, a radio wave reflector is used for the exterior of a building (for example, JP-A-55-49797, JP-A-55-13600, and JP-A-56-1).
No. 5831, Japanese Patent Laid-Open No. 59-4696, etc.) and those using an electromagnetic wave absorber (for example, Japanese Patent Laid-Open No. 55-64114).
JP, JP-A-56-3912, JP-A-59-4
696, etc.) have been published.

[0010]

However, the one using the radio wave reflection material has a problem that the reflected radio wave cannot be eliminated, although the radio wave can be prevented from entering the building. Further, as a radio wave absorber, mainly ferrite (Fe
₂ O ₃ ) is used, but since it is expensive and has a large specific gravity (about 5), the weight of the wall itself increases and the structure must be strengthened and the structure becomes complicated. . As a result, the workability is reduced and the construction cost is increased. Further, since the radio wave absorber is inserted into the exterior wall, there are technical and external design problems. Therefore, generally, a construction method in which a ferrite sintered body is concealed and integrated in a PC panel is prevalent.

The present invention is intended to solve the above-mentioned problems, and it is possible to reduce the number of electromagnetic wave absorbers used, efficiently absorb external radio waves, prevent the intrusion of external radio waves, and reduce reflected waves. It is intended to provide a radio wave absorbing wall that can be used.

[0012]

To this end, the present invention provides a plurality of walls having a vertical electromagnetic wave absorber and an inclined electromagnetic wave reflecting member, which are arranged so that the mounting positions on the wall substrate side are butted against each other, as wall surfaces formed on the wall substrate. Of the vertical electromagnetic wave absorber and the electromagnetic wave absorber which are arranged so that the tips of the electromagnetic wave absorbers of one group are abutted against the tips of the electromagnetic wave reflectors of the other group, or the mounting positions on the wall base side are abutted. It is characterized in that a plurality of sets each having a radio wave reflecting member inclined on both sides are arranged continuously by abutting the radio wave reflecting member of one set and the tip of the radio wave reflecting member of the other set. It is what

[0013]

In the radio wave reflection wall of the present invention, external radio waves are reflected by the radio wave reflection material toward the radio wave absorber arranged perpendicular to the wall surface, and the radio wave absorber absorbs radio wave energy. Can be prevented and the reflected radio waves on the wall can be eliminated. Further, since the radio wave reflecting material is used, it is not necessary to dispose the radio wave absorber on the entire wall surface, and the use of the radio wave absorber can be reduced.

[0014]

Embodiments will be described below with reference to the drawings.
FIG. 1 is a view showing an embodiment of a radio wave reflecting wall according to the present invention, 1 is a wall base, 2 is a radio wave reflecting material, 3 is a radio wave absorber, 4
Indicates the front panel.

In FIG. 1, the radio wave absorber 3 is made of ferrite or the like, and the radio wave reflector 2 is made of glass, a metal plate, a conductive film, a metal mesh or the like, and the radio wave absorber 3 is used to absorb external radio waves. It is reflected toward. The wall base 1 is made of, for example, a general wall material such as concrete, and the radio wave absorbers 3 and the radio wave reflectors 2 are alternately arranged in a sawtooth shape as shown in the figure. The front panel 4 is a kind of decorative panel, and may or may not be glass, concrete, or another general building material. Also, the front panel 4
May support the tip ends of the radio wave absorber 3 and the radio wave reflection material 2 at a predetermined interval instead of the entire surface. As the glass as the radio wave reflecting material, high performance heat ray reflecting glass, glass on which a conductive film is vapor deposited or adhered, glass with a metal mesh, and the like can be used.

According to the present invention having the above-mentioned structure, the external radio wave is reflected by the radio wave reflection material 2 to the radio wave absorber 3 and absorbed there. Since the radio wave reflection material 2 reflects the external radio wave at a substantially right angle. The unnecessary radio wave can be reflected and absorbed without affecting the others.

FIG. 2 is a view showing another embodiment of the radio wave reflection wall according to the present invention, in which the radio wave reflection material 2'is triangular wave-shaped (mountain shape).
The electromagnetic wave absorber 3 is arranged in the valley. The spacer 5 does not need to use a radio wave absorber. In this way, both sides of the radio wave absorber 3 can be used for absorbing radio wave energy, so that the number of the radio wave absorbers 3 can be reduced to half as apparent from comparison with the embodiment of FIG. . In this case, the radio wave reflection material 2 '
The radio waves reflected by can be almost absorbed by the radio wave absorber 3 by increasing the inclination θ of the radio wave reflector 2 ', but the interval between the radio wave absorbers 3 becomes short, and many radio wave absorbers 3 are installed. Will have to. On the contrary, if the inclination θ of the radio wave reflecting material 2 ′ is made smaller as shown by the dotted line θ ′, the radio wave reflected at the end of the radio wave reflecting material 2 ′ will protrude from the radio wave absorber 3, but Since it is combined with the reflected wave on the opposite side having the opposite phase on the surface of k on the extension of 3, it can be attenuated. Therefore, although the utilization factor of the radio wave absorber 3 is reduced, the reflected wave can be sufficiently attenuated, the interval between the radio wave absorbers 3 can be lengthened, and the number of the radio wave absorbers 3 can be reduced.

The radio wave absorber used in the present invention is required to have a high absorption rate of radio wave energy as required performance.
It is lightweight and its characteristics do not change over time due to climate change. Examples of such materials include foamed plastic molded products containing carbon, composite magnetic bodies, ferrite sintered bodies, and composite ferrite bodies.

The relationship between the wall material and the reflectance is shown in the table below at a frequency of 150 MHz.
Means total reflection and no absorption. That is, since the reflectance is the reciprocal of the absorptivity, a material having a low reflectance is a material suitable as a radio wave absorber.

[0020] The present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, the radio wave reflection wall is formed of a flat surface having a certain inclination, but it may be formed of a curved surface so that the reflected waves on the slab are concentrated.

[0021]

[Effects of the Invention] As is clear from the above description, according to the present invention, the electromagnetic wave reflector reflects the external radio wave to the electromagnetic wave absorber, and the electromagnetic wave absorber absorbs the electromagnetic wave energy. It is possible to prevent intrusion into the building and reduce building reflected waves. Moreover, it is possible to reduce the number of radio wave absorbers having a large specific gravity by utilizing the radio wave absorber, and the radio wave reflector can be made lighter by using a thin metal or the like.
It is possible to reduce the weight of the wall structure and reduce the cost.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a radio wave reflection wall according to the present invention.

FIG. 2 is a view showing another embodiment of the radio wave reflection wall according to the present invention.

[Explanation of symbols]

1 ... Wall base, 2 ... Radio wave reflection material, 3 ... Radio wave absorber, 4 ... Front panel

Claims (2)

(57) [Scope of utility model registration request] 1. A plurality of sets having a vertical electromagnetic wave absorber and a tilted electromagnetic wave reflecting member, which are arranged so that the mounting positions on the wall substrate side are butted against each other, as a wall surface formed on the wall substrate. A radio wave absorption wall having a structure in which a tip of a body and a tip of another set of radio wave reflecting members are abutted against each other to be continuously arranged. 2. A plurality of sets, each having a vertical electromagnetic wave absorber and a radio wave reflecting member inclined on both sides of the electromagnetic wave absorber, the wall surfaces being formed on the wall substrate, the vertical electromagnetic wave absorbers having their mounting positions on the wall substrate side butted against each other. A radio wave absorbing wall, characterized in that it has a configuration in which one set of radio wave reflecting members and the tips of the other set of radio wave reflecting members are abutted against each other so as to be arranged continuously.