JPH0672297U - Radio wave absorption wall - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an electromagnetic wave absorbing wall that uses less electromagnetic wave absorbing material, efficiently absorbs an external electromagnetic wave, prevents the intrusion of the external electromagnetic wave, and reduces the reflected wave. [Structure] An electromagnetic wave absorber 3 arranged perpendicularly to a wall surface and an electromagnetic wave reflector 2 inclined with respect to the electromagnetic wave absorber 3 are provided, and external radio waves are directed to the electromagnetic wave absorber 3 by the electromagnetic wave reflector 2. The radio wave absorber 3 reflects and absorbs radio wave energy.
Therefore, 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. The radio wave absorbers 3 and the radio wave reflectors 2 are alternately arranged in a sawtooth pattern, or the radio wave reflectors 2 are arranged in a triangular wave pattern and the radio wave absorbers 3 are arranged in the valleys.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a radio wave absorption wall that absorbs external radio waves that cause radio interference.

[0002]

[Prior art]

 There are many types of radio waves in the city, including TV radio waves, radio waves for telephones, wireless taxis, hams, and other wireless communications. Therefore, various electromagnetic disturbances are a problem depending on the urban environment. For example, various unwanted radio waves that are flying around often cause interference waves that cause sudden malfunctions of PCs and malfunctions of precision machines.

In addition, as the number of buildings in urban areas has risen, TV radio wave interference has occurred, and it is becoming a social issue. For example, the ghost phenomenon in which the TV screen appears double or triple not only gives viewers an unpleasant sensation, but also impedes the transmission of personal information.The cause of this is the obstacle caused by the reflection of radio waves from the building. Is. Such electromagnetic disturbances are 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 building reflected wave at a place far from the place of transmission or the building periphery.

Therefore, as a countermeasure against such TV radio interference, a system has been conventionally adopted in which the shadow portion of a building is mainly predicted and measured from the direction in which the radio waves come, and the signal is supplied by a shared reception antenna by wire. There is.

[0005] In general, whether a flying radio wave is a required radio wave or an unnecessary radio wave varies depending on a building application. 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 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 been made more compact than conventional ones to the book type, and the momentum of introduction of computers and other OA equipment in offices is remarkable. In such offices, the amount of important information including confidential information is increasing in the information handled by OA equipment and the like. Therefore, if the OA equipment malfunctions due to the influence of noise, etc., the information in it 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 OA equipment and medical equipment used in a building, a system in which a radio wave shielding material (reflection material) or a radio wave absorbing material is installed on the exterior of the building is important.

In the past, 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, JP-A-56-15831, JP-A-59-4696, etc.) and those using a radio wave absorber (for example, JP-A-55-64114, JP-A-56-3912, and JP-A-59-4696). Many have been issued.

[0010]

[Problems to be solved by the device]

However, the one using the radio wave reflecting material can prevent the radio wave from entering the building, but has a problem that the reflected radio wave cannot be eliminated. Ferrite (Fe ₂ O ₃ ) is mainly used as a radio wave absorber, but since it is expensive and has a large specific gravity (about 5), the weight of the wall itself increases and the strength of the structure is high. However, there is a problem in that the structure must be increased and the structure becomes complicated. As a result, the workability is reduced and the construction cost is increased. Moreover, since the electromagnetic 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 to solve the above problems, and to reduce the amount of electromagnetic wave absorber used, to efficiently absorb external radio waves, to prevent the intrusion of external radio waves, and to reduce the reflected waves. The object is to provide a radio wave absorption wall that can

[0012]

[Means for Solving the Problems]

 Therefore, the radio wave reflection wall of the present invention is composed of a radio wave absorber arranged perpendicularly to the wall surface and a radio wave reflection material arranged so as to be inclined toward the radio wave absorber. It is characterized in that it is reflected toward the absorber and the radio wave absorber absorbs radio wave energy.In addition, the radio wave absorber and the radio wave reflection material are alternately arranged in a sawtooth shape, or the radio wave reflection material is triangular wave shape. It is characterized by arranging and arranging a wave absorber in the valley.

[0013]

[Action]

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

[0014]

【Example】

 Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a view showing an embodiment of a radio wave reflecting wall according to the present invention, in which 1 is a wall base, 2 is a radio wave reflecting material, 3 is a radio wave absorber, and 4 is a 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 to prevent external radio waves from being absorbed by the radio wave absorber 3. It is reflected toward. The wall base 1 is made of, for example, another general wall material such as concrete, in which the wave absorbers 3 and the 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 any other general building material. Further, the front panel 4 may support not the entire surface but the tip ends of the radio wave absorber 3 and the radio wave reflection material 2 at a predetermined interval. 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 attached, glass with a metal mesh, and the like can be used.

According to the present invention having the above-described structure, the external radio wave is reflected by the radio wave reflection material 2 to the radio wave absorber 3 and is absorbed there, and the external radio wave is reflected at a substantially right angle by the radio wave reflection material 2. As a result, unnecessary radio waves can be reflected and absorbed without affecting 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 arranged in a triangular wave shape (mountain shape) and the radio wave absorber 3 is arranged in the valley thereof. Is. 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 the comparison with the embodiment of FIG. it can. In this case, the radio wave reflected by the radio wave reflecting material 2'can be almost absorbed by the radio wave absorbing body 3 by increasing the inclination θ of the radio wave reflecting material 2 ', but the interval between the radio wave absorbing bodies 3 is short. Therefore, it becomes necessary to install many radio wave absorbers 3. 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 by the end of the radio wave reflecting material 2 ′ will protrude from the radio wave absorber 3, but the radio wave absorbing body 3 ′. Since it is combined with the reflected wave on the opposite side that has 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, a light weight, and characteristics that do not change due to climate and aging. There are foamed plastic moldings, 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. A reflectance of 100 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 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]

[Effect of device]

 As is clear from the above description, according to the present invention, the electromagnetic wave is reflected by the electromagnetic wave reflector to the electromagnetic wave absorber, and the electromagnetic wave energy is absorbed by the electromagnetic wave absorber, so that the electromagnetic wave can be prevented from entering the building. It is possible to prevent and reduce building reflected waves. Moreover, it is possible to reduce the number of radio wave absorbers that have a large specific gravity by using radio wave absorbers, and the weight of radio wave reflectors can be reduced by using thin metal, etc., so the wall structure can be made lighter and the cost can be reduced. Can be achieved.

[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

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location H01Q 17/00 9067-5J

Claims (3)

[Scope of utility model registration request] 1. A radio wave absorber comprising a radio wave absorber disposed vertically to a wall surface and a radio wave reflector disposed so as to be inclined toward the radio wave absorber. A radio wave absorption wall characterized in that the absorber is configured to absorb radio wave energy. 2. The radio wave absorber according to claim 1, wherein the radio wave absorbers and the radio wave reflectors are alternately arranged in a saw-tooth shape. 3. The radio wave absorber according to claim 1, wherein the radio wave reflectors are arranged in a triangular wave pattern and the radio wave absorber is arranged in a valley thereof.