JP2003064802A - Radio wave absorption panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio wave absorption panel having an exterior material having a large adhesion force, having low cost, and being usable for VHF and UHF in common. SOLUTION: This radio wave absorption panel is constructed in such a way that a nipping material 9 is arranged on the back of the exterior material 1, an absorbing body layer 12 is arranged on the back of the nipping material, a precast plate 5 is arranged on the back of the absorbing body layer, and the nipping material and the precast plate are mutually connected by a joint bar 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave absorption panel which is used for an outer wall of a high-rise building and prevents unnecessary reflected radio waves such as television radio waves.

[0002]

2. Description of the Related Art Unnecessary reflected radio waves due to high-rise buildings have an obstacle to television broadcasting, and there is a problem of radio disturbance such as a so-called ghost on a television screen. As a countermeasure against this, for example, a common antenna is installed in an area where radio interference occurs. However, this method has a problem that the equipment costs a lot and the base station and the cable are destroyed by a natural disaster such as an earthquake. Therefore, a so-called radio wave absorption panel in which an outer wall of a building itself has a radio wave absorption function has been put into practical use. A ferrite plate is mainly used as the radio wave absorber, and various radio wave absorption panels using these magnetic bodies have been proposed. An exterior material is arranged on the front surface of such a radio wave absorption panel, and this exterior material may be formed from one wide plate, but in consideration of appearance or economy, (one wide plate is used. Often, a plurality of divided plate-shaped exterior tiles or the like are used.

As an example of such a conventional electromagnetic wave absorbing panel, Japanese Utility Model Laid-Open No. 6-86398 discloses an electromagnetic wave absorbing panel composed of a precast plate, a plurality of electromagnetic wave absorbing materials and a plurality of exterior materials. The radio wave absorption panel will be described with reference to the drawings. Fig. 8 shows actual flat 6-
FIG. 9 is a perspective view of a conventional radio wave absorption panel described in Japanese Patent No. 86398, and FIG. 9 is an enlarged view showing attachment of a spring member described later to an exterior material.

In this radio wave absorbing panel, a radio wave absorbing material 92, which is a thin ferrite plate having a width of 100 mm and a thickness of 6 to 8 mm, is arranged on the back of an exterior material 91 such as an exterior tile, and a reflection reinforcing bar 93 and a structural reinforcing bar 94 are provided. Together with this, it is integrated by a precast plate 95 made of concrete. The radio wave absorber 9
2 is arranged continuously in the magnetic field direction (longitudinal direction) of the incident radio wave,
The arrangement of the radio wave absorbers 92 is repeated in the electric field direction (width direction) orthogonal to the magnetic field direction at a predetermined GAP rate (the ratio of the distance between the adjacent radio wave absorbers 92 to the electric field direction dimension of the radio wave absorbers 92). Is formed by. The precast plate 9 is provided in the space between the adjacent electromagnetic wave absorbers 92.
Concrete forming 5 is filled.

This radio wave absorption panel is installed in a building with the exterior material 91 on the front (outside) and the precast plate 94 on the back (inside). With such a configuration, the TV radio waves incident on the outer wall of the building are either absorbed by the radio wave absorber 92 or reflected by the reflection reinforcing bar 93 in a phase opposite to that of the incident radio waves to cancel the incident radio waves and be reflected from the outer wall. Is suppressed.

[0006]

In the radio wave absorption panel by the conventional precast concrete construction method, concrete is made to adhere to the exterior material or the radio wave absorption material, but normally, the adhesion force of the exterior material or the radio wave absorption material to the concrete. Is small. Therefore, actual Kaihei 6-863
In the radio wave absorbing panel described in Japanese Patent Publication No. 98, the spring members 999 are attached to both ends of the exterior material 91, and a part of the spring members 999 passes through the space in the electric field direction (width direction) of the radio wave absorbing material 29. The precast plate 95 is embedded in concrete. In this way, the exterior material 91 is fixed to the precast plate 95, and the radio wave absorber 92 is also sandwiched between the exterior material 91 and concrete and fixed to the precast plate 95. However, this spring member 999
Both ends 2 of the exterior material 95 are provided with mounting holes for mounting
It is necessary to process and form a total of four places, and this process cannot be performed during the molding of the exterior material 95, and it is necessary to process by a drill or the like after the molding and drying. Therefore, there is a problem that the manufacturing process is complicated and the cost is high. Further, the production cost of the spring member 999 is also required, which further increases the cost.

As a countermeasure against the ghost of the television,
The use of electromagnetic wave absorption panels on the outer walls of high-rise buildings is becoming common, but most of them are mainly in the VHF band.
There were few broadband electromagnetic wave absorption panels shared with the HF band.
Especially in rural areas, the transmission points of TV radio waves (VHF, UHF) are often the same, and it has been difficult to obtain sufficient radio wave absorption characteristics with the conventional radio wave absorption panel. Further, in the vicinity of the capital city, the incoming radio waves of VHF and UHF have different incident angles from each other, and it is difficult for the conventional radio wave absorbing panel to obtain sufficient radio wave absorption characteristics for radio waves having a wide frequency band and different incident angles. there were.

[0008] In particular, when a radio wave absorbing panel is manufactured by the precast concrete method, the water content of the precast plate increases the water content of the precast plate, and the higher the water content, the higher the dielectric constant. For this reason,
As described above, the dielectric constant of the concrete filled in the space between the adjacent electromagnetic wave absorbers 92 is also high, which deteriorates the electromagnetic wave absorption characteristics. Desired radio wave absorption characteristics can be obtained by drying until the water content becomes about 1%, but it takes about 2 years or more for the drying, which is not realistic. As described above, the conventional radio wave absorption panel produced by the precast concrete method has a problem that the high dielectric constant due to the high water content of concrete impairs the radio wave absorption characteristics.

Therefore, an object of the present invention is to provide a radio wave absorption panel which solves the above problems, is inexpensive, and can be used for both VHF and UHF.

[0010]

According to a first aspect of the present invention, a sandwiching material is provided on the back of an exterior material, and an absorber layer is provided on the back of the sandwiching material. The radio wave absorption panel is characterized in that a precast plate is disposed on the back side, and the sandwiching material and the precast plate are connected by a joint line.

A second invention of the present application is characterized in that, in the absorber layer, a radio wave absorber and a rib material are formed adjacent to each other in a direction of an electric field. It is a panel.

A third invention of the present application is the radio wave absorbing panel according to the second invention, wherein the rib material has a dielectric constant of 1.2 or less.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a radio wave absorption panel of the present invention will be described with reference to the drawings. In the following, the directions, etc., when a radio wave absorption panel is installed in a building will be described as follows. (1) The direction or surface on the outside of the building is referred to as the front, and the direction or surface on the inside of the building is referred to as the back. (2) The vertical direction is referred to as the magnetic field direction. (3) A direction orthogonal to the magnetic field direction and also to the front and back directions (horizontal width direction of the radio wave absorption panel) is referred to as an electric field direction. Note that the description of the direction and the like will be used in the description of a state different from the state in which the electromagnetic wave absorption panel is installed in the building (for example, the state in which the electromagnetic wave absorption panel is tilted during assembly).

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
Horizontal cross-sectional view of the radio wave absorption panel (Y-Y in FIG. 2 described later)
2 is a front view of the radio wave absorption panel viewed from the front side, FIG. 3 is a cross-sectional view (vertical cross-sectional view) taken along line X1-X1 of FIG.
FIG. 4 is an enlarged view of a joint muscle 10 described later in FIG. 1, and FIG.
FIG. 6 is a view on arrow X2-X2 in FIG.

As the exterior material 1, for example, exterior tiles are used. A groove 1 a is provided on the back of the rectangular plate-shaped exterior material 1. In the present embodiment, as shown in FIG. 3, groove 1a is formed in the electric field direction.

As the rectangular plate-shaped electromagnetic wave absorber 2, for example, a ferrite plate is used. When the radio wave absorber is a ferrite plate, the width (electric field direction) of the ferrite plate is A, and the thickness (front and back direction) of the ferrite plate is B, so that A ≧ B. The same applies to other embodiments.

The dielectric constant of the rectangular plate-shaped rib material 7 is preferably 1.2 or less, more preferably 1.1 or less. This is because when the dielectric constant of the rib material 7 exceeds 1.2, the radio wave absorption characteristic (reflection attenuation amount) in the UHF frequency band is deteriorated. In the present embodiment, foamed styrene having a dielectric constant of about 1.05 is used as the rib material 7. The thickness (front-back direction) of the rib material 7 is made substantially equal to the thickness (front-back direction) of the radio wave absorber 2.

As the material of the sandwiching material 9, for example, resin mortar, glass fiber reinforced concrete or the like is used.

The joint streak 10 includes an outer locking portion 10a which engages with the sandwiching material 9, an inner locking portion 10b which engages with a precast plate 5 which will be described later, and a first connecting portion which is connected to the outer locking portion 10a. 10c1, a second connecting with the first connecting portion 10c1
And a third connecting portion 10c3 connected to the second connecting portion 10c2. It should be noted that in FIG. 1 or FIG. 4, the joint streak 10 may be symmetrical in the lateral direction of the drawing sheet and asymmetric in the lateral direction of the drawing sheet. In addition, in FIG. 1 or 4, the outer locking portion 10a, the inner locking portion 10b, the first connecting portion 10c1, the second connecting portion 10
Although the c2 and the third connecting portion 10c3 are shown as linear, they may be curved. In this embodiment, the joint muscle 1
Although a stainless steel rod having a diameter of 2 mm was bent in a U shape as 0, the outer locking portion 10a and the inner locking portion 10b were used so as to be substantially parallel to the front and back directions, but the present invention is not limited to this. The stopper 10a or the inner locking portion 10b is the sandwiching material 9
Any shape, direction, and size that engage with the convex portions 9b, 9c or the precast plate 5 can be used. Further, the material is not limited to stainless steel, and may be iron coated with rustproof treatment such as plating or resin. 2 places
The inner dimension in the width direction (electric field direction) of the one connecting portions 10c1 is set to be larger than the inner dimension in the width direction (electric field direction) of the two third connecting portions 10c3. The outer locking portion 10a and the inner locking portion 10b are preferably wide (or long) in the magnetic field direction and the electric field direction. However, when the outer locking portion 10a and the inner locking portion 10b are made of a conductive material, if the shape is wide (or long) in the electric field direction, it is easy to reflect radio waves, and thus narrow (or short) in the electric field direction. ) The shape is preferable. Similarly,
When the connecting portion 10c is also made of a conductive material, it preferably has a narrow (or thin) shape in the direction of the electric field. It is preferable that the thickness (front-back direction) of the outer locking portion 10a is appropriately set so that it can be engaged with the sandwiching member 9 and is as small as possible within a range that does not hinder strength. (The first connecting portion 10c1, the second connecting portion 10c2, the third connecting portion 10
The shape and size of c3 will be described later. ) Then, the joint streak 10 of any material and shape satisfying the above conditions can be used.

The required number of exterior materials 1 are arranged in the direction of the magnetic field and the direction of the electric field with predetermined gaps in between. A joint material 8 such as mortar is inserted in the gap between the adjacent exterior materials 1. In this way, the exterior material assembly 11 is formed.

The sandwiching material 9 is arranged in the exterior material aggregate 11,
A joint streak 10, a radio wave absorber 2 and a rib 7 are arranged on the sandwiching member 9, and a concrete precast plate 5 is arranged together with the reflection reinforcing bar 3 and the structural reinforcing bar 4 (in case of necessity) to be integrated. An electric wave absorption panel is formed. There are two methods of forming the radio wave absorption panel as follows.

The first method is as follows. In this first method, the spacer 6 described later in FIG. 6 is not used. A sandwiching material 9 is disposed on the back of the exterior material aggregate 11. As the arrangement method, for example, the sandwiching material 9
The exterior material aggregate 11 is installed in a formwork having a cavity corresponding to the outer contour of the above so that the back faces upward (substantially horizontal), and the material of the sandwiching material 9 dissolved in water is attached to the exterior material aggregate. Body 1
Pour into the gap between 1 and the mold. The resin mortar or glass fiber reinforced concrete used as the material for the sandwiching material 9 has good fluidity, can be injected into the gap, and has excellent adhesiveness with the exterior material 1, and the exterior material 1
The groove 1a provided on the back side of the substrate has the effect of increasing the adhesiveness. In this way, the exterior material 1 and the sandwiching material 9 come into close contact with each other.

Before the sandwiching member 9 arranged as described above is dried and solidified, the outer locking portion 10a of the joint bar 10 is engaged with the sandwiching member 9 so that the joint bar 10 is clamped. It is arranged on the material 9. The outer locking portion 10 of the joint muscle 10
The a may or may not contact the exterior material 1. Then, the radio wave absorbing material 2 and the rib material 7 are adjacent to each other in the electric field direction, and the absorber layer 12 is arranged so that both ends in the electric field direction become the rib material 7. A gap is provided at the boundary between the adjacent radio wave absorber 2 and the rib material 7 where the joint 10c of the joint line 10 is sandwiched so that the joint 10c can be sandwiched.

Next, a precast plate 5 made of concrete is arranged together with the reflection reinforcing bar 3 and the structural reinforcing bar 4 (if necessary), and the precast plate 5 is connected to the joint bar 10.
Engages with the inner locking portion 10b. As described above, the exterior material 1
And the sandwiching material 9 are in close contact with each other, the absorber layer 12 is disposed on the back of the sandwiching material 9, and the outer locking portion 10a of the joint streak 10 is engaged with the convex portion 9b of the sandwiching material 9. Since they are fitted together, they are joined by the joint streak 10 to form an integrated radio wave absorption panel.

The length (in the magnetic field direction) of the radio wave absorber 2 or the rib material 7 is set to an appropriate value so as to satisfy the finished size of the radio wave absorber panel. The radio wave absorber 2 or the rib material 7 may be integrated in the magnetic field direction, or may be divided, and in the case of being divided, the length (magnetic field direction) dimension may or may not be the same. The width (electric field direction) dimension and thickness (front and back direction) dimension of the radio wave absorber 2 or the rib material 7 or the interval between the adjacent radio wave absorbers 2 is set to an appropriate value according to the incident radio wave to be taken. . As shown in FIG. 1, the width of the rib material 7 at both ends (or either end) in the electric field direction (electric field direction)
The dimensions may be different from the width (electric field direction) of the other rib material 7 (not the end portion). Inside of the electric field direction (width direction) of the two first connecting portions 10c1 of the joint muscle 10,
The width (electric field direction) of the joint muscle 10 is set so as to be in contact with the outside of the electric wave absorber 2 in the electric field direction (width direction) (that is, the electric wave absorber 2 is sandwiched between the two connecting portions 10c1). Is set. The radio wave absorber 2 is sandwiched between the two connecting portions 10c1 so that the second connecting portion 10c2 (or the connecting portion between the first connecting portion 10c1 and the second connecting portion 10c2) hits the radio wave absorbing material 2. Outside contact part 1
0a engages with the sandwiching material 9 (the outer locking portion 10a engages with the sandwiching material 9).
May or may not abut) the outer locking portion 10a, the first connecting portion 10c1, the second connecting portion 1
The size of 0c2 is set to an appropriate value. Second like this
The connecting portion 10c2 (or the connecting portion of the first connecting portion 10c1 and the second connecting portion 10c2) is brought into contact with the radio wave absorber 2 so that the sandwiching material 9 is heated by, for example, heat.
Even if the swells, the side effect that the radio wave absorber 2 does not have to be displaced can be expected.

The structural rebar 4 is disposed and fixed outside the inner locking portion 10b of the joint bar 10, and the reflective rebar 3 is disposed and fixed outside the structural rebar 4. The arrangement position is the structural rebar 4
May be inside the inner locking portion 10b, or the reflective reinforcing bar 3 may be inside the structural reinforcing bar 4, but it is desirable that the reflective reinforcing bar 3 is outside the internal locking portion 10b or the structural reinforcing bar 4, so As described above, the arrangement position is such that the structural rebar 4 is outside the inner locking portion 10b and the reflective rebar 3 is the structural rebar 4 described above.
It is preferable to be outside. The fixing means may be any means such as welding or binding with a string. In addition, in FIG. 1, an example in which the structural reinforcing bars 4 are arranged at the center positions of all the joint bars 10 in the horizontal section in the electric field direction is shown, but the present invention is not limited to this, and a part of the joint bars 10 in the horizontal section is shown. The structural rebar 4 may be arranged in the above position, or the structural rebar 4 may be arranged at a position other than the center of the joint bar 10 in the electric field direction. As described above, the second connecting portion 10c
2 (or the first connecting portion 10c1 and the second connecting portion 10c)
Since the portion (connection portion with c2) is brought into contact with the electromagnetic wave absorbing material 2, the distance from the electromagnetic wave absorbing material 2 to the inner locking portion 10b depends on the length (front and back direction) of the third connecting portion 10c3. Since it is determined and as described above, the reflection reinforcing bar 3 is fixed to the inner locking portion 10b through the structural reinforcing bar 4, the distance from the wave absorber 2 to the reflection reinforcing bar 3 is the third connecting portion 10b.
It is determined by the length (front-back direction) of c3. Then, the length (front and back direction) of the connecting portion 10c3 is set so that the distance from the radio wave absorber 2 to the reflection reinforcing bar 3 becomes an appropriate value according to the incident radio wave to be taken as a countermeasure.

The second method is as follows. With the back of the exterior material assembly 11 facing upward (substantially horizontal), the exterior material assembly 1
The absorber layer 12 and the joint streak 10 similar to those in the first method are arranged on the back side of 1 through the spacer 6.

As the rod-shaped spacer 6, for example, a resin material, a fiber, a mortar material, a fiber reinforced concrete material or the like is used. When the spacer 6 is made of a resin material, it is preferable to form a rod-shaped spacer in a hollow shape in order to reduce thermal expansion. The spacer 6 does not have to be rod-shaped, and may be, for example, a lump-shaped one. Spacer 6 of FIG.
The arrangement direction of is an example, and the arrangement direction is not limited to this and may be an arbitrary arrangement direction.

The material of the sandwiching material 9 is injected into the gap between the sheathing material aggregate 11 and the absorber layer 12 which is held by the spacer 6, and in the first embodiment, the sheathing material aggregate 11 and the sandwiching material are combined. In the same manner as when the above, the exterior material aggregate 11 and the sandwiching material 9 are in close contact with each other. In the first method, a mold provided with a cavity corresponding to the outer contour of the sandwiching material was used, but in the second method, as described above, the spacer 6 absorbs the exterior material aggregate 11 and the exterior material aggregate 11. Since the gap with the body layer 12 is maintained, the mold having the cavity is unnecessary, and only the mold for preventing the material of the sandwiching material 9 from protruding from the end in the magnetic field direction or the end in the electric field direction is required. .

Next, a precast plate 5 made of concrete is arranged together with the reflection reinforcing bar 3 and the structural reinforcing bar 4 (if necessary), and the precast plate 5 is connected to the joint bar 10.
Engages with the inner locking portion 10b. Similar to the first method, the exterior material 1 and the sandwiching material 9 are in close contact with each other, the absorber layer 12 is disposed on the back side of the sandwiching material 9, and the joint line 1
Since the outer locking portion 10a of No. 0 is engaged with the sandwiching material 9, the electromagnetic wave absorption panel is formed by being joined by the joint streak 10.

Other than that, it is the same as the above-mentioned first method.

This radio wave absorption panel is installed in a building with the exterior material 1 on the front and the precast plate 5 on the back.
With such a configuration, the television radio waves that have entered the outer wall of the building are either absorbed by the radio wave absorber 2 or the reflective rebar 4
The light is reflected in the opposite phase to the incident radio wave, cancels out the incident radio wave, and suppresses the reflection from the outer wall.

The radio wave absorption panel of this embodiment is provided with the exterior material 1
Since the sandwiching member 9 and the precast plate 5 are brought into close contact with each other and the sandwiching member 9 and the precast plate 5 are joined and integrated by the joint streak 10, the spring member used in the conventional radio wave absorption panel is unnecessary. Further, since foamed styrene having a dielectric constant of about 1.05 is sandwiched between the adjacent electromagnetic wave absorbing materials 2, the electromagnetic wave absorbing characteristics are improved as compared with the conventional electromagnetic wave absorbing panel, and VHF and UHF are improved. Combined use is possible. Therefore, it is possible to obtain a broadband electromagnetic wave absorption panel which is inexpensive and can be used for both VHF and UHF. Further, in the second method of forming the integrated radio wave absorption panel, since the mold having the cavity corresponding to the outer contour of the sandwiching material is unnecessary as described above, the second method is more preferable than the first method. Form cost can be reduced.

(Embodiment 2) This embodiment is the same as Embodiment 1.
In the radio wave absorbing panel, the radio wave absorbing material and the rib material are sandwiched between two second connecting portions of the joint streak. The front view of the radio wave absorption panel of the present embodiment as seen from the front side is the same as that of FIG. 2 of the first embodiment. FIG. 6 is a sectional view (horizontal sectional view) taken along line YY of FIG. In addition,
The same parts are designated by the same reference numerals as those in FIGS. 1 to 5 described above.

In the joint streak 210 of this embodiment, the dimension of the inner locking portion 210b in the electric field direction is larger than the dimension of the inner stating portion 10b of the joint streak 10 of the first embodiment in the electric field direction, and as described above, the electromagnetic wave absorption. The material 2 and the rib material 7 are sandwiched between two second connecting portions 210c1 of the joint streak 210. Note that, in FIG. 6, the second electromagnetic wave absorber 2 and the fourth rib member 7 from the left side of the drawing are sandwiched between the second connecting portions 210c1 of the two joint lines 210 on the right side of the drawing in the drawing. However, the present invention is not limited to this, and for example, the second rib member 7 and the second electromagnetic wave absorber 2 from the left side of the drawing may be used.
May be sandwiched between the second connecting portions 210c1, and any adjacent electromagnetic wave absorbing material 2 and rib material 7 may be sandwiched.

The other features are the same as those in the first embodiment, and the operations and effects are also the same as those in the first embodiment.

(Third Embodiment) This embodiment is the same as the first embodiment.
In the radio wave absorbing panel of No. 1, the rib material is divided in the direction of the electric field, and the radio wave absorbing material and the divided rib material are sandwiched between two second connecting portions of the joint streaks. is there. The front view of the radio wave absorption panel of the present embodiment as seen from the front side is the same as that of FIG. 2 of the first embodiment. Figure 7
FIG. 3 is a Y-Y sectional view (horizontal sectional view) of FIG. 2. The same parts are designated by the same reference numerals as those in FIGS. 1 to 6 described above.

The rib material 37 of the present embodiment is obtained by dividing the rib material 7 of the first embodiment in the electric field direction, and the joint streak 310 has the inner locking portion 310b whose electric field direction dimension is the joint of the first embodiment. It is larger than the dimension of the inner locking portion 10b of the muscle 10 in the electric field direction. In FIG. 7, the first embodiment
Although the rib material 7 is divided into two, it is not limited to this and may be divided into three or more. The radio wave absorber 2 and the divided rib material 37 adjacent to the radio wave absorber 2 are connected to the joint line 210.
It is sandwiched between the two second connecting portions 310c1. In addition, in FIG. 7, the second connecting portion 310c1 at two places of the joint streak 310 on the right side of the drawing has two rib members 37 and a third electromagnetic wave absorber 2 from the left of the drawing in two places. An example in which it is sandwiched between the second connecting portions 310c1 has been shown, but the present invention is not limited to this, and for example, the third rib material 37 and the second electromagnetic wave absorbing material 2 from the left side of the drawing may be provided at two locations. Connecting part 3
10c1 may be sandwiched, and any adjacent electromagnetic wave absorber 2 and rib material 37 may be sandwiched.

The other features are the same as those in the first embodiment, and the actions and effects are also the same as those in the first embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. The dimensions and shapes described in the embodiments are not limited to this, and may be optimal dimensions and shapes in consideration of functions, productivity, and the like. For example, the cross-sectional shape described in the embodiment is
It goes without saying that various shapes suitable for building members can be used.

The following modifications are also possible. (1) In the embodiment, the exterior tile is used as the exterior material 1, but the present invention is not limited to this, and any material suitable for the outer wall material can be used. (2) In the embodiment, the groove 1a on the back side of the outer package 1 is formed in the electric field direction, but the invention is not limited to this, and the groove 1a is not limited to this.
The direction in which a is formed can be any direction.
Further, the groove 1a may be discontinuous (interrupted groove) or may be uneven in depth. Since the groove 1a is for increasing the adhesion between the sandwiching material 9 and the exterior material 1, the groove 1a
Instead of a, a recess may be provided on the back side of the exterior material 1, or the back surface of the exterior material 1 may be roughened. (3) In the embodiment, the ferrite plate is used as the radio wave absorbing material, but the present invention is not limited to this, and any material having a radio wave absorbing function may be used. For example, resin or rubber containing magnetic powder may be used. Is also good. (4) In the embodiment, after the material for the sandwiching material is injected,
The joint streaks were arranged on the sandwiching material before it was dried and solidified. However, after the joint streaks were arranged at a predetermined position (using a positioning jig, etc.), the sandwiching was performed. The material of the material may be injected. (5) In the embodiment, the joint material 8 is inserted into the gap between the adjacent exterior materials 1. However, the joint material 8 may be omitted, or the joint material 8 may be inserted instead of the joint material 8. The material of the material may be inserted. (6) In the embodiment, the number of exterior materials provided on one radio wave absorption panel is plural, but one exterior material may be provided on one radio wave absorption panel. (7) In the embodiment, as a method of disposing the sandwiching material on the back side of the exterior packaging material 11, the backing material of the exterior packaging material 11 is directed upward (substantially horizontal) and the sandwiching material is poured. However, the present invention is not limited to this, and any method such as inclining the exterior material aggregate 11 or making it substantially vertical can be used. (8) In the first method of the embodiment, the exterior material aggregate 11
As a method of disposing the sandwiching material on the back of the sandwiching material, a mold provided with a cavity corresponding to the outer contour of the sandwiching material 9 was used. Alternatively, the outer contour may be formed by ironing or the like. (9) In the embodiment, the reflection reinforcing bar 3 is used, but instead of the reflection reinforcing bar 3, a reflection plate formed of a conductive plate may be used. (10) In the embodiment, a gap is provided at the boundary between the adjacent electromagnetic wave absorber 2 and the rib material where the joint portion of the joint line is sandwiched so that the joint portion can be sandwiched. Instead of providing the gap, the rib member may be provided with a notch capable of accommodating the connecting portion. (11) In Embodiment 1, all the electromagnetic wave absorbers 2 having a horizontal cross section
However, the two second connecting portions 10c1 of the joint muscle 10
The radio wave absorber 2 of a part of the horizontal cross section is sandwiched between the second connecting portions 10 of the joint muscle 10.
It may be sandwiched between c1. (12) In the first embodiment, the radio wave absorber 2 is sandwiched between the two second connecting portions 10c1 of the joint streak 10, but the rib material 7 is not the radio wave absorber 2 but the joint streak. It may be sandwiched between two second connecting portions. Then, as in the case of the modification (11), a part of the rib material 7 of the horizontal cross section may be sandwiched between two second connecting portions of the joint streak. (13) In the embodiment, the second connecting portion of the joint muscle (or the connecting portion between the first connecting portion and the second connecting portion)
Although the contacting state is in contact with the radio wave absorbing material 2 or the rib material, it may not be in contacting state. Therefore, the second connecting portion of the joint muscle may be eliminated. If they are not brought into contact with each other, for example, even if the sandwiching material 9 expands due to heat,
The secondary effect that the radio wave absorber 2 or the rib material does not have to be displaced cannot be expected, but the present invention can be implemented. (14) In the embodiment, the reflective reinforcing bar 3 is fixed to the inner locking portion of the joint reinforcing bar via the structural reinforcing bar 4, but the structural reinforcing bar 4 may not be fixed to the joint reinforcing bar 10. The reflective reinforcing bar 3 may be fixed to the inner locking portion of the joint bar or the third connecting part without the structural reinforcing bar 4, or may be fixed to the structural reinforcing bar 4 not fixed to the joint bar. Alternatively, neither the joint bar 10 nor the structural rebar 4 may be fixed.

In the present invention, the combination of the above-mentioned modifications or the combination of the embodiment and the modifications can be arbitrarily performed.

[0043]

According to the present invention, it is possible to provide a radio wave absorption panel having the following effects. (1) The manufacturing process can be simplified. (2) Sufficient electromagnetic wave absorption characteristics can be obtained with respect to a wide frequency band including the VHF band and the UHF band and radio waves with different incident angles. (3) Since the water content of concrete can be sufficiently reduced in a short period of time, it has a low dielectric constant and good electromagnetic wave absorption characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view showing a first embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a vertical sectional view showing an embodiment of the present invention.

FIG. 4 is an enlarged view showing the joint muscle according to the first embodiment of the present invention.

5 is a view taken along arrow X2-X2 in FIG.

FIG. 6 is a horizontal sectional view showing a second embodiment of the present invention.

FIG. 7 is a horizontal sectional view showing a third embodiment of the present invention.

FIG. 8 is a perspective view of a conventional radio wave absorption panel.

FIG. 9 is an enlarged view showing the attachment of a spring member to an exterior material of a conventional radio wave absorption panel.

[Explanation of symbols] 1 Exterior material 1a groove 2 Radio wave absorber 3 Reflective rebar 4 structural rebar 5 Precast board 6 spacers 7 rib material 8 joint materials 9 sandwiching material 10,210,310 Joint muscle 10a Outer locking part 10b, 210b, 310b Internal locking part 10c1 1st connecting part 10c2 Second connection part 10c3 Third connecting part 11 Exterior material aggregate 12 Absorber layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshiyuki Moriyama             2977 Tahira, Yoshii-cho, Tano-gun, Gunma Prefecture Hitachi Kin             Within Genki Kiko Co., Ltd. F-term (reference) 2E001 DH01 FA04 FA51 GA01 GA77                       HA01 HA04 HA05 HA20 HB02                       HB03 HB07 HD11 LA06                 2E002 NB06 PA04 RA02 RB02                 2E162 AA01 CA00 CA11 CA12 CD04                 5E321 AA44 BB53 GG11                 5J020 BD02 EA02 EA10

Claims (3)

[Claims] 1. A sandwiching material is provided on the back side of an exterior material, an absorber layer is provided on the back side of the sandwiching material, and a precast plate is provided on the back side of the absorber layer. A radio wave absorption panel, characterized in that the material and the precast plate are connected by a joint streak. 2. The radio wave absorbing panel according to claim 1, wherein the absorber layer is formed by a radio wave absorbing material and a rib material being adjacent to each other in the electric field direction. 3. The radio wave absorption panel according to claim 2, wherein the rib material has a dielectric constant of 1.2 or less.