JP2000013082A - Television radio wave nonreflecting building and electromagnetic wave absorbing panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent reflection of electromagnetic wave by arranging rectangular prism ferrites in parallel, at a specified interval, on an electromagnetic wave reflector and directing the upper surface of ferrite in the direction of the electromagnetic wave. SOLUTION: The electromagnetic wave absorbing panel 7 comprises an electromagnetic wave reflector 17 arranged on the bottom 16 of an outer frame 15 constituting the entirety and rectangular prism ferrites 18 arranged on the upper surface thereof at a specified interval. Upper surface of the ferrite 18 is directed in the direction of the electromagnetic wave and the ferrites are closed by a holding member 19 so that they are restricted from the upper surface. Since television radio wave is not reflected but absorbed on the indoor side of a building, reflection of electromagnetic wave can be prevented even in a building having a an electromagnetic wave shield room.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TV radio wave non-reflection type building and an electromagnetic wave absorbing panel used for the same, and particularly to a TV radio wave non-reflection panel which introduces and absorbs incoming TV radio waves into a building and does not reflect the surroundings. Type buildings and electromagnetic wave absorbing panels.

[0002]

2. Description of the Related Art Recent buildings tend to be required to respond to the information age by sufficiently introducing advanced information equipment such as OA equipment and personal computers and information systems using the same. The required performance of a building in the information age is firstly, "prevention of malfunction of information equipment" to protect equipment inside the building from unnecessary radiation from outside, and secondly, a computer system in the building. And "interruption of information leaking as low-level radio waves from the wireless LAN to the outside" and "interruption of communication carriers when a wireless LAN or the like is used between adjacent buildings." The goal was to achieve "advanced use of radio frequency" in order to eliminate the shortage of channels caused by such problems. In order to achieve these performances, it has been practiced to construct the building by using electromagnetic wave shielding materials in the frame of the building and in openings such as windows and doorways, so that the whole building has an electromagnetic wave shielding structure.

As the development density of information communication has increased, prevention of electromagnetic wave complications has emerged as a major theme. In order to meet this demand, effective communication zones must be formed and each communication zone must be distinguished. It is necessary to increase the density of the electromagnetic wave shield. Thorough electromagnetic wave shielding will block electromagnetic waves flying around the building, and the electromagnetic waves will be reflected on the building and generate secondary noise around the building, causing new electromagnetic interference. .

One of the electromagnetic waves familiar in daily life is 90-
There are VHF and UHF television waves having a frequency of the 770 MHz band, and when a high-rise building is constructed, electromagnetic waves reflected on this building have given obstacles such as ghosts to a considerable distance over a long distance. As for the reflection obstacle and the shielding obstacle of the TV radio wave, in the building without the electromagnetic wave shield, the countermeasures against the obstacle of the TV radio wave have already been studied.

[0005] Among the obstacles of the TV radio wave, as for the shielding obstruction, a range that the radio wave does not reach is relatively specified, so that the building side may change the direction of the building or limit the height to restrict the influence. Measures have been taken to reduce the range, and the receiving side has taken measures by installing a joint receiving facility, moving an antenna, or joining an existing CATV. On the other hand, various measures have conventionally been taken for reflex failure because the affected area is far and wide. The measures on the building side are firstly studying the direction, arrangement and height of the building, and then the shape and material of the building wall are also reflected in the direction of reflection, and both in terms of absorbing radio waves and preventing reflection. Considerations have been added.

The countermeasures based on the shape of the wall surface are to provide an unevenness or a slope on the wall surface so as to induce the cancellation of the radio wave and to direct the reflection direction of the radio wave to a direction in which no obstacle occurs. As a countermeasure for radio wave absorption, a method of adopting a PC plate on which a ferrite tile is implanted as an outer wall surface so as to have an electromagnetic wave absorbing performance in a building has been often used. In the ferrite PC version, a ferrite tile is placed inside a fiber-reinforced mortar covered with tiles, and a reflective reinforcing bar is placed on the back side of the ferrite tile to collect the radio waves radiated by the ferrite tiles, convert them into heat, and allow radio waves to enter the building. It is configured not to. In this case, the ferrite tile has a narrow frequency band of electromagnetic waves to be absorbed, so different sizes and arrangements are prepared for VHF and UHF, respectively. The improvement was desired.

Therefore, as an electromagnetic wave absorber, a broadband electromagnetic wave absorber in which a rectangular parallelepiped ferrite magnetic material is arranged in parallel on a reflection surface of an electromagnetic wave under a certain condition has been proposed. 42999, JP-A-4-532
No. 99) Attempts to expand the frequency band to absorb and reduce the weight. However, there is no description about what kind of structure the ferrite magnetic material is specifically formed, and the state is awaiting further development. On the other hand, for buildings, attention has been paid to glass and the like that does not reflect electromagnetic waves, and construction methods employing glass curtain walls to pass electromagnetic waves have been studied, but due to building members existing inside the glass curtain walls Since reflections still exist, their countermeasures remain a problem.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention actively introduces VHF and UHF television radio waves into a building and absorbs the radio waves inside the building.
It is an object of the present invention to provide a TV non-reflection type building which does not cause radio wave reflection and an electromagnetic wave absorption panel used therefor even in a building where an electromagnetic wave shielding room is arranged in the room.

[0009]

According to the present invention, a glass curtain wall is basically arranged on the outer wall of a high-rise building, and an electromagnetic wave absorbing panel for horizontal polarization is installed on the indoor side of the glass curtain wall.
It is a TV radio wave non-reflective type building that absorbs UHF TV radio waves, and is an electromagnetic wave absorbing panel used therein, wherein a rectangular parallelepiped ferrite is vertically arranged on an electromagnetic wave reflecting plate in parallel with a predetermined interval, and is configured. It is characterized in that the upper surface of the ferrite is directed in the direction of electromagnetic waves. Specifically, the electromagnetic wave absorbing panel is installed outside the windows and beams and shields the interior of the building from electromagnetic waves.A fireproof structure is attached to the lower surface of the electromagnetic wave reflecting plate, It is characterized in that the upper surface of the ferrite of the absorption panel or between the ferrites and the upper surface of the ferrite are closed by the holding member of the fireproof structure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of a TV radio non-reflective building according to the present invention. The building 1 is composed of a high-rise section 2 and a low-rise section 3, and a measure for preventing an obstacle to a television wave is considered in the high-rise section 2. When a TV radio wave is transmitted as shown by an arrow, the reflection obstruction caused by the reflection of the TV radio wave to the side of the building causes an affected area to extend far and wide. The radio wave non-reflective building 1 has a glass curtain wall 4 that transmits television waves on the outer wall of the high-rise section 2 and actively incorporates the inside of the building without reflecting the television waves to deal with the inside of the building. The adoption of a periodical configuration prevents TV radio wave reflection interference.

FIG. 2 shows a state of processing of a TV radio wave at a window and a beam in the TV radio non-reflective building 1 according to the present invention. Looking at the radio wave reflectance of each material constituting the wall surface of the building, the metal curtain wall is 100%, the reinforced concrete is 70%, and the reinforced concrete is 50%.
%, Magnetic tile 3%, glass 3%, and ferrite 1
%. In the present invention, attention is paid to a glass having a low reflectance from among the above materials, and a glass curtain wall 4 is employed to allow television waves to enter the room so as not to be reflected by the outer wall of the building 1. Since the building components are present on the indoor side of the glass curtain wall 4 in the same manner as a normal building, the window sill 5, the beam 6, and the support of the curtain wall are located near the outside of the building. In addition, the electromagnetic wave absorbing panel 7 according to the present invention is arranged on the outside thereof, so that the entered radio waves are not reflected outside the building again. As a material of glass curtain wall, it is said that TV radio wave transmittance is relatively high,
Float transparent plate glass, heat ray reflection glass, radio wave transmission type heat ray reflection glass having high shielding performance and the like are suitable.

FIG. 3 shows a processing state of a television wave at the opening 8 in the TV wave non-reflective building according to the present invention. As shown in FIG. 3, with respect to the television radio waves entering the inside of the building from the opening 8 located between the window sill and the beam, first, the arrangement and the orientation of the wall 9 in the building are considered. By controlling the traveling direction of the reflected waves, the TV radio waves entering the building are diverged inside the building to reduce the energy. However, the range in which the structure of the building and its layout can be changed is naturally determined, so the range in which the traveling direction of the reflected wave can be restricted is limited. Is not perfect. Therefore, as shown in the figure, the electromagnetic wave absorbing panel 7 according to the present invention is provided as a second means for advancing or reflecting television waves which cannot be controlled in the direction of the present invention. It absorbs and converts it into heat to reduce energy.

FIG. 4 shows an embodiment in which an electromagnetic wave shielded space is formed inside a building. The TV radio wave non-reflective building 1 according to the present invention employs a center core system, and each room existing around the core unit 10 is shielded from electromagnetic waves. The electromagnetic wave shielding room 11 on the side where the TV radio wave enters enters is disposed at a position close to the core 10 away from the wall, and the electromagnetic wave absorbing panel according to the present invention is provided on the outer wall surface 12 of the electromagnetic wave shielding room 11 as shown in the figure. The electromagnetic wave absorbing panel 7 is provided on the entire wall 13 of the core portion 10 so that the television wave that has entered the interior of the building does not leave the building again as a reflected wave. Electromagnetic wave shield room 14 arranged on the other side where TV waves do not come
Is divided over the entire floor so that it is possible to eliminate the difficulty of talking due to the complexity of PHS, mobile phones, etc., and to be compatible with the introduction of a system such as a wireless LAN. In the present embodiment, the building is described as a center core type, but the core type is not limited to this, and the present invention is also applicable to the case of a double-sided core, an eccentric core, and the like.

As described above, the TV radio wave non-reflection type building according to the present invention is designed so that the building actively absorbs and processes the wide area TV radio waves covering VHF and UHF in other areas, thereby achieving the other areas. The building does not cause obstacles due to reflection. Therefore, in the conventional idea, it was difficult to shield the electromagnetic wave in the building, which was considered difficult because the shielding material reflected the TV wave. is there.

Next, an electromagnetic wave absorbing panel which has greatly contributed to the formation of the above-described TV radio wave non-reflective building will be described with reference to FIGS.
It will be described based on. FIG. 5 shows an embodiment of the electromagnetic wave absorbing panel according to the present invention in a plan view and a cross section taken along an arrow. The electromagnetic wave absorbing panel 7 is provided at the bottom 1 of the outer frame 15 constituting the whole.
6, an electromagnetic wave reflecting plate 17 is provided.
A rectangular parallelepiped ferrite 18 is arranged at a predetermined interval on the upper surface of 7, and is closed by a holding member 19 to restrain the entire ferrite from the upper surface. Although the outer frame 15 does not expect any function in terms of absorbing electromagnetic waves, it is preferable that the outer frame 15 be made of a nonmetallic material and have fire resistance in order to avoid reflection of television waves. On the other hand, since the electromagnetic wave reflection plate 17 electromagnetically occupies a large part in electromagnetic wave absorption, it is essential that the electromagnetic wave reflection plate 17 be made of metal, and at the same time, when the function as a support for the ferrite 18 is required. Needs to have a required thickness and strength, and when a function as a support for the ferrite 18 is separately provided, the thickness of the electromagnetic wave reflection plate 17 may be thin, and a metal sheet such as aluminum foil may be used. Good.

The holding member 19 is desirably non-metallic and fire-resistant, like the outer frame 15. In addition, the holding member 19 must be made of a dry material having no hygroscopicity. This is because if the holding member 19 absorbs water, the conductivity between the ferrites changes, and the radio wave cannot be completely absorbed. Therefore, as the material of the outer frame and the holding member, a calcium silicate material, a gypsum board, a fiber reinforced concrete, an ALC plate, and the like are being considered.

The main purpose of the fitting state between the holding member 19 and the ferrite 18 is that it is mechanically dense. However, regarding the manufacturing method, the ferrite is inserted into a groove formed in the holding member or a mold. A molding method in which an electromagnetic wave reflecting plate having a ferrite attached thereto is disposed in a frame and the above-described material is poured later can be adopted as needed. In the case of TV radio waves, radio waves are basically horizontally polarized waves, so it is considered that rectangular parallelepiped ferrite is arranged vertically, but we also want to prevent reflection from vertical polarization due to other requirements In this case, it is possible to cope with this by disposing a horizontal ferrite behind a vertical ferrite and arranging the ferrite integrally in a lattice.

FIG. 6 shows another embodiment of the electromagnetic wave absorbing panel according to the present invention in a plan view and a sectional view taken along an arrow. As in the example of FIG. 5, the electromagnetic wave absorbing panel 20 has a rectangular parallelepiped ferrite 24 arranged at a predetermined interval on the upper surface of the electromagnetic wave reflecting plate 23 installed on the bottom portion 22 of the outer frame 21 constituting the whole. Is provided with a holding member 25 and is integrally formed with the outer frame 21 to fix the ferrite. As for the materials of the outer frame, the holding member, etc., see FIG.
Those satisfying the same conditions as those of the example are suitable.

The electromagnetic wave absorbing panel 30 shown in FIG. 7 is the simplest example comprising a ferrite and an electromagnetic wave reflecting plate. In this example, the ferrite 3 is placed on the electromagnetic wave reflecting plate 32 provided on the outer frame 31 only by fixing means such as bonding.
Since the three elements are arranged independently, elements which affect electromagnetically are removed from the periphery of the ferrite, and this is an example in which a design for efficiently absorbing television waves is the easiest. However, in this case, since both the ferrite and the electromagnetic wave reflecting plate do not have the fire resistance required for the building at all, the outer frame 31 that is in contact with the lower surface of the electromagnetic wave reflecting plate has the electromagnetic wave absorbing panel 30. This is an embodiment different from each of the above examples in that it functions as a fireproof material when it is installed in a building.

FIG. 8 shows an example of an arrangement relationship between the electromagnetic wave reflection plate 32 and the ferrite 33. For example, when it is necessary to set the attenuation rate of the television wave to 20 to 25 dB, a rectangular parallelepiped ferrite 33 having a thickness W = 8 mm and a height H = 20 mm is placed above the electromagnetic wave reflection plate 32 at a distance B =
It has been experimentally confirmed that the arrangement can be made possible by arranging at 20 mm. However, these numerical values are not specified at all, and for example, the attenuation rate is set to 20 to 25.
When set to dB, the thickness W is 7 to 8 mm and the height H
It has been clarified by tests and the like that the distance B can be adjusted to have a width of about 16 to 22 mm and the interval B has a width of about 18 to 20 mm.

In the above setting, each value naturally changes depending on the setting of the attenuation rate. For example, if the attenuation rate is sufficient even if the attenuation rate is 15 dB, the size of the ferrite is also changed. Since the arrangement interval can be reduced to a small size, an even smaller and lighter electromagnetic wave absorbing panel can be provided. Therefore, in designing the electromagnetic wave absorbing panel, it is necessary to appropriately adjust according to the measured radio wave environment in consideration of the selection of the area where the building is to be constructed and the planning of the place where the electromagnetic wave absorbing panel is to be installed inside the building. .

[0022]

The television wave non-reflection type building and the electromagnetic wave absorbing panel used in the present invention are basically provided with a glass curtain wall on the outer wall of a high-rise section, and a horizontally polarized electromagnetic wave absorbing panel on the indoor side. Install and VHF, UH
F is to absorb TV radio waves, and is configured by arranging rectangular parallelepiped ferrites vertically on the electromagnetic wave reflection plate in parallel with a predetermined interval, and directing the top surface of the ferrite in the direction of the electromagnetic wave. By absorbing TV radio waves inside the building without reflecting the TV radio waves, the effect of preventing the reflection of radio waves is exhibited even in a building where an electromagnetic wave shield room is arranged in the room. Specifically, the electromagnetic wave absorbing panel is installed outside the window sill and the beam and shields the interior of the building from electromagnetic waves. Since it is characterized in that it is closed by the holding member, it is easy to handle and install and has an effect of greatly contributing to a reduction in total cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a TV radio wave non-reflective building according to the present invention.

FIG. 2 is a partial sectional view of a glass curtain wall near a window sill and a beam.

FIG. 3 is a cross-sectional view of an arrangement of an electromagnetic wave absorbing panel with respect to an opening.

FIG. 4 is a layout plan view of an electromagnetic wave shielding room.

FIG. 5 is an electromagnetic wave absorbing panel according to the present invention.

FIG. 6 is another electromagnetic wave absorbing panel according to the present invention.

FIG. 7 is another electromagnetic wave absorbing panel according to the present invention.

FIG. 8 is a layout diagram of ferrite.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Non-reflective building of television wave 2 High-rise part 3 Low-rise part 4 Glass curtain wall 5 Window stand 6 Beam 7, 20, 30 Electromagnetic wave absorption panel 8 Opening 9 Wall 10 Core part 11 Electromagnetic wave shield room 12 Outer wall surface 13 Wall surface 14 Electromagnetic wave shield Room 15 Outer frame 16 Bottom of outer frame 17 Electromagnetic wave reflector 18 Ferrite 19 Holding member 20, 30 Electromagnetic wave absorbing panel 21, 31 Outer frame 22 Bottom of outer frame 23, 32 Electromagnetic wave reflecting plate 24, 33 Ferrite 25 Holding member

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masatake Miyashita 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Yoichi Seki 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation F term in the company (reference) 5E321 AA41 AA46 BB24 BB51 GG11 GH10

Claims (8)

[Claims] 1. A TV radio wave non-reflective building comprising: a glass curtain wall disposed on an outer wall of a high-rise section; and a horizontally polarized electromagnetic wave absorbing panel installed on the indoor side of the glass curtain wall. 2. The TV radio non-reflective building according to claim 1, wherein the electromagnetic wave absorbing panel is installed outside the window sill and the beam. 3. The TV radio non-reflective building according to claim 1, wherein the interior of the building is shielded from electromagnetic waves. 4. The method according to claim 1, wherein a rectangular parallelepiped ferrite is vertically arranged in parallel on the electromagnetic wave reflecting plate at a predetermined interval, and the upper surface of the ferrite is directed in the direction of the electromagnetic wave. An electromagnetic wave absorbing panel used for the described TV radio wave non-reflective building. 5. The electromagnetic wave absorbing panel according to claim 4, wherein a gap between the ferrites and an upper surface of the ferrites are closed by a holding member. 6. The electromagnetic wave absorbing panel according to claim 4, wherein an upper surface of the ferrite is closed by a holding member. 7. The electromagnetic wave absorbing panel according to claim 4, wherein a refractory structure is attached to a lower surface of the electromagnetic wave reflecting plate. 8. The electromagnetic wave absorbing panel according to claim 5, wherein the holding member is a refractory structure.