JPS6094799A - Panel for radio wave absorbing wall - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in radio wave absorbing wall panels.

BACKGROUND ART In houses surrounding high-rise buildings, the high-rise buildings act as reflectors of television waves, resulting in television reception interference known as so-called ghost interference, which is considered a major social problem.

One of the measures to eliminate the above-mentioned ghost disturbance is to use a ferrite molded plate, which is a ferromagnetic material, as a radio wave absorber.
A radio wave absorbing wall panel has been proposed which prevents radio wave reflection from the building by attaching it to the wall of the building.

Since the ferrite attenuates the energy of radio waves due to its magnetic loss characteristics, in order to make the radio wave absorption effect of ferrite effective, a magnetic field of a length commensurate with the wavelength of each radio wave is required. For this purpose, it is necessary to arrange the ferrites continuously in the direction of the radio wave's magnetic field. Also, should 7 elites be continuous in the direction of the electric field of radio waves?1. Or they need to be arranged at regular intervals.

General television radio waves (VHF band, UHF band) use horizontal polarization, so a magnetic field is generated in the vertical direction, and an electric field is generated in a direction perpendicular to this, that is, in the horizontal direction. If you try to apply ferrite to the frequency band of TV radio waves,
For example, in the VHF band, the wavelength is about 1.5 to 3 m, so the magnetic field due to 7-elite is also 3 y in the vertical IH direction.
Ideally, there should be about n. In other words, it is necessary to arrange the ferrites continuously in the vertical direction for about 3 m.

Conventionally, for this purpose, the devices shown in FIGS. 1 to 5 have been proposed.

゛ In other words, what is shown in Figure 1 is a ferrite plate (
1) is pasted with adhesive (2) to the concrete layer (3) that forms the framework of the building.In the case shown in Figure 2, the ferrite plate (1) is attached to gold P4 metal fittings (4). ) (5) attached to the concrete layer (3).

In addition, the one shown in Figure 3 is a ferrite plate (1) embedded in a concrete layer (3) with its surface bent, and the one shown in Figure 4 is a ferrite plate (1) embedded in a concrete layer (3) with its surface bent.
) is embedded in concrete () M (3) with the surface immersed, and further fixed with metal fittings (7). The one shown in Figure 5 has a ferrite plate (3) embedded in a concrete layer.

However, among the radio wave absorbing walls configured as above,
In the wall of FIG. 1, there is a high risk that the adhesive will deteriorate due to external factors such as ultraviolet rays, heat, and rain, and that the ferrite plate will fall off. Moreover, since many ferrite plates are lined up in a band on the wall surface, the appearance design is poor.

In the case of the wall shown in FIG. 2, there is little risk of the ferrite falling off, but the exterior design is as bad as the wall shown in FIG.

When ferrite is embedded in the surface of a concrete layer, as in the wall in Figure 3, there is a risk that the ferrite plate will fall off due to the adhesive force between the 7-elite plate and the concrete, but as shown in Figure 4. Metal fittings (If you press the ferrite plate with force, there is less worry about it falling off. However, from an external design perspective, it is
It's just as bad as the wall in the picture.

In the case of the wall shown in FIG. 5, if ferrite is embedded in concrete, the concrete in front of the ferrite will contain water even when it is air-dried, so it will become a reflector and significantly reduce the radio wave absorption effect.

In each case, for the walls shown in FIGS. 1 to 5, only a resin-based paint or a spray material with good radio wave transmittance can be applied as a decorative material on the surface. If the decorative tile were to be attached to the surface of the ferrite board using mortar, the mortar would be difficult to adhere to the smooth ferrite board surface, so there would be an extremely high risk of the decorative tile on the surface falling off. In addition, since the mortar contains moisture, this is the reflector and Table 9
, which reduces the radio wave absorption effect of ferrite.

The present invention aims to provide a radio wave absorbing wall panel which has been designed to solve the above problems and which can maintain the appearance design without impairing the radio wave absorbing effect of the ferrite plate. This is the main purpose.

The radio wave absorbing wall panel according to the present invention consists of an assembly consisting of a synthetic resin sheet with a decorative material fixed to the front side and a magnetic plate such as ferrite to the back side, and a radio wave absorbing material such as nine rebars and wire mesh placed on the back side of the synthetic resin sheet. It is characterized by a structure in which the mortar (i#) containing a reflective member, a concrete layer, or a synthetic resin layer are integrated.

Hereinafter, the present invention will be specifically explained based on drawings showing an example of its implementation.

In Figure 6, (a) is an assembly that constitutes a radio wave absorbing panel, which includes a sheet (8) made of a synthetic resin with a low dielectric constant such as nylon or polycarbonate, and a part on the front side of the sheet (8). It is composed of a large number of decorative tiles (9) arranged in an embedded state and a large number of ferrite plates (IQ+) fixed and arranged on the back side with an adhesive.

Synthetic resin sheet (8) constituting the aggregate (g)
One end of an anchor member aυ made of the same resin material is fixed to a required portion of the back side by welding.

On the back side of the aggregate (5), radio wave reflecting members made of reinforcing bars (12+) are arranged at regular intervals, and the anchor members αυ protruding from the aggregate (5)
is embedded in a concrete layer (13) cast in the space behind the assembly, and the assembly (8) is fixed to the concrete layer a floor via the anchor member Ql).

According to the horizontal 1ν5 of the radio wave absorbing wall panel described above, decorative materials such as decorative tiles can be used on the wall surface in the same way as conventional building exterior walls without impairing the radio wave absorption effect of the ferrite board. 0 Moreover, for radio wave absorbing walls, it consists of an aggregate made of a synthetic resin sheet with a decorative material fixed to the front side and a ferrite plate fixed to the back side, and a concrete layer poured and formed with a radio wave reflecting member inserted. Since the panels can be manufactured as factory products, there is no need for external scaffolding during construction, which not only prevents radio wave reflections at the same time as installing the panels, but also prevents radio wave reflections from scaffolding, steel frames, and concrete frames during building construction. be able to. Particularly in the case of large buildings, because the construction period is long, radio wave reflection interference during construction is also a problem, but by using the radio wave absorbing wall panels, 011 disturbances can be prevented. There are advantages.

Furthermore, the aggregate (5) and the radio wave reflecting part iA'(1'
In the case where a radio wave absorbing panel is constructed with a concrete IJ layer (131) having a Since the radio wave reflection obstacle circle also serves as a structural reinforcement, it is extremely advantageous in maintaining the strength of the panel, and the overall thickness can be reduced.

The surface decorative material constituting the radio wave absorbing wall panel assembly (8) is not limited to decorative tiles, and stone, ceramic decorative materials, etc. may also be used. Further, the concrete layer may be formed as a mortar layer or a synthetic resin layer.

Next, examples of this invention will be shown below.

Example (1) In the basic panel structure shown in Fig. 7, the tile thickness (c4)
=0.8 cm-, mortar layer thickness (dl) = O175
Example (2) In the basic panel structure shown in Fig. 7, when the ferrite thickness (4) = 1.1 cWL, the characteristic values shown in Fig. 8 were obtained. )
"14 ctrLS mortar layer thickness (z, ), = 1.
5~4.5 anz ferrite thickness (4) = 1.05cW
When L was used, the characteristic values shown in FIG. 9 were obtained.

Example (3) In the basic panel structure shown in Figure 7, tile thickness (4) = 2
．． When 5cWLs concrete layer thickness (d,)=3 to 6- and ferrite m(4)=1cfn, the characteristic values shown in FIG. 10 were obtained.

Example (4) In the basic panel structure shown in Fig. 7, stone thickness (lls) =
5.6 an, concrete layer thickness (d,) = 4.5~Z
5an and ferrite thickness ('t)=0.9 cWt, the characteristic values shown in FIG. 11 were obtained.

In the panel structure shown in Fig. 12, the normalized impedance seen from the ferrite surface (here, if is the 16th
As shown in the figure, this is the normalized impedance seen from the surface when ferrite is lined with metal. Now, the normalized impedance seen from the tile surface 2. is 1 da, r; d, l << 1, then (ke4) 2
ε, (1, shiS(arm 4C circle (1λ), name -4-shi, -shiqd, (1-X:ε,)...
...(2) (1) formula, = (・n 17 "l) 10;j' ti, (
1 (stop', p+7 de d1)'ε3]f λ λ 1=, (1-2(Tfd height 63)+iC"+ +2!4(1*"'s+(2d+)'a)
)λ λ f 2(da)2d, d2 is also (1, (〒d1)2ε3(1, then 2″3ki” +7 (d+ cts ('%ε, -1)
)...(3) f λ In equation (2), s = 1 + 10 is the condition for no reflection.However, in actual ferrite, the thickness control is 4
It is necessary to consider about ±1 m/m, and since it has frequency characteristics, the condition of "3" 1 + '10 is set to V
Although it is impossible to satisfy the entire HF TV frequency band (90-220MHz), the return loss is 2QdJ.
There is a possibility that it can be designed with 1 or more.

(-20Ltf1 trillion 1 ≧ 20) Figure 14 shows an example of the frequency characteristics of the impedance if of ferrite.
Even if m/m changes, a return loss of 20d, 8 or more is maintained.

From equation (3) and FIG. 14, at f=222MHz, A = (1-10-01) +/1%Ctl+-/! 5(
(1-7o, o +) 11. -1 ))”' (1+
D, 000465ds eB ) +i (0,04
65 (Shizu+'4 (1g8))-o, ol) α0O04
Since C54ε3(1), the thickness of the ferrite is +1
Even if there is a deviation of m1m, if the imaginary part is greater than -0.16, the problem persists. Therefore, −0,16≦0.045(d1+4 (1−g,))−
0, (IN Therefore -3, 2≦d++4 (1-6,)... (4) Similarly, at f=90MHz, ('+ 'a((
1+,) 0.15)g8-i))=(1+o,o
o2s4g,)+7[0,[1189(d++4 ('-εm))+o,
1x) 0.0'O254ε3 (1), so even if the thickness of the ferrite deviates by ±1 m/m, there is no problem as long as the imaginary part is smaller than 10, 13. Therefore, 10, 13≧ o, o1a9(4+4 (1-εs>)+
o, 1s Therefore, 0≧d1+ ets (1-ε3) ・・・・・・・・・
・(5) (4) From formula (5), 4(ε3-1)-3,2≦d,≦'s(εs 1 )
(cm) ”” (61 When applied to the embodiment shown earlier,
It will look like this:

The calculated value of equation (6) and each of the above embodiments match well even considering that equation (6) is an approximate equation. Example (4
), the reason why there is a slight difference between the measured value and the calculated value using equation (6) is that the degree of approximation of equation (6) is worse than that of equation (3), and 4 + This is because the effect that the thickness d2 of the ferrite becomes thinner as the thickness of 4 increases does not fit into equation (6).

As described above, according to the present invention, there is an aggregate formed by fixing a decorative material on the front side of a synthetic resin sheet and a magnetic plate such as ferrite on the back side, and a radio wave-receiving material such as reinforcing bars, wire mesh, etc. on the back side. Reflective material.

Since the radio wave absorbing panel is constructed by integrating the mortar layer, concrete layer, or synthetic resin layer formed by pouring the magnetic plate, it is possible to maintain the appearance design without impairing the radio wave absorbing effect of the magnetic plate. However, it is possible to obtain a radio wave absorbing wall with excellent workability and economical efficiency.

[Brief explanation of drawings]

Figures 1 to 5 are perspective views showing conventional radio wave absorbing walls, Figure 6 is a perspective view of a radio wave absorbing wall showing an embodiment of the present invention, and Figure 7 is a single radio wave absorbing panel. Figures 8 to 11 are radio wave absorption intestinal diagrams;
Figures 2 and 13 are explanatory diagrams of the basic structure of a single panel;
FIG. 14 is a Smith chart of normalized input impedance. (1)... Ferrite plate, (2)... Adhesive, (3
]...Concrete layer, (4H5H force...metal fittings, (
5)...Aggregation of radio wave absorption panels, (8)...Synthetic resin sheet), +91...Decorative tile, (10)° Ferrite board I...Anchor member, (Tri...・Reinforcing bars, facing...concrete layer. Patent applicant: NICHIAS Co., Ltd. TDC Co., Ltd., Kenzai Kogyo Co., Ltd. 71 Figure 1 Figure 3 Figure 2 Figure 1 C Figure 4 Figure 6 too 200 f (MHz) Fig. 1O f (MHz) Fig. 9 +00 200 f (MHz) Fig. 11 f (MHz) Continued from page 1 0 Inventor Taibe Miura Within Shikisha Company, Chuo Ward, Tokyo 0 Inventor Takashi Watanabe Inside Shikisha, Chuo-ku, Tokyo

Claims (6)

[Claims] (1) A mortar consisting of an aggregate made of a synthetic resin sheet with a decorative material fixed to the front side and a magnetic plate such as ferrite fixed to the back side, and a radio wave reflecting member such as reinforcing bars and wire mesh placed on the back side. A radio wave absorbing wall panel characterized in that a layer or a concrete layer or a synthetic resin layer are integrated. (2) The radio wave absorbing wall panel according to claim 1, wherein the synthetic resin sheet is made of nylon or polycarbonate resin. (3) A patent claim in which one end of the anchor member is fixed to the back side of the synthetic resin sheet constituting the aggregate, and the other end of the anchor member is held in a mortar layer, a concrete layer, or a synthetic resin layer. The radio wave absorbing wall panel according to item 1. (4) The radio wave absorbing wall panel 0 according to claim 1, wherein the decorative material is formed of tiles. (5) The thickness of the mortar layer or concrete layer is d
11 When the thickness of the tile or stone used as a decorative material is d3, 0.75<d, <7.5(2), 0.5
The radio wave absorbing wall panel according to claim 1, having a thickness in the range <ti3<5.6 (Mll). (6) When the thickness of the mortar layer or concrete layer is d3, and the thickness of the decorative tile or stone is d3, '1(8B-1)-g2<, d, <:'s(6
g-1) The radio wave absorbing wall panel according to claim 5, which satisfies (cWt).