JPH01241199A - Dry-type radio wave absorbing panel - Google Patents

Abstract

PURPOSE:To enable absorbing wide frequency band radio waves and to lighten the weight, by interposing an air layer between an outside fixture panel laminated with a secondary radio wave absorber, and an inside fixture panel of radio wave reflecting layers laminated on the rear of an inside fixture finishing material. CONSTITUTION:An outside fixture panel A and an inside fixture panel B are so joined through the medium of distance holding materials 7 that an air layer 8 may exist between both panels. Furthermore, a panel 9 is fitted to the periphery. In this way, a radio wave absorbing panel is constituted. Wide frequency band radio waves are absorbed by a primary radio wave absorber 2 mixed with minute ferrite particles and a secondary radio wave absorber 3 consisting of ferrite tiles, laminated in order to the back of a nonmetal-made outside fixture finishing material 1 of the outside fixture panel A. Besides, the air layer 8 kept between both inside and outside panels A, B shows an adiabatic effect, and the weight of the radio wave absorbing panel is reduced owing to the existence of the air layer 8.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a dry radio wave absorbing panel for the purpose of reducing and preventing TV radio wave reflection disturbances in mid- to high-rise dry curtain wall buildings.

(Prior art) Conventionally, in order to reduce and prevent interference with TV radio wave reflection on buildings, methods have been used in which ferrite tiles are directly attached to the exterior of the building, and metal mullions are placed on the exterior walls of the building. , a method of using a ferrite tile holding jig has been proposed, but these are only used for special buildings.

However, recently, PC curtain walls used as exterior wall materials in which ferrite tiles are integrally molded have been used in high-rise buildings.

Figures 4 and 5 show a conventional PC curtain wall integrally molded with ferrite tiles, and the concrete frame (
The exterior tile Φ) is fixed on the outer surface of a), or the ferrite tile (C) is layered on the back side of the stone.

In the figure, (d) is a reflection plate, and (e) is a reinforcing rod.

(Problems to be Solved by the Invention) In the conventional PC curtain wall using ferrite tiles, tiles, stones, etc. are used as exterior materials and ferrite tiles are also incorporated, so the weight is large and the handling work requires large size. There are also many problems in terms of construction, such as the need for a lifting machine.

Furthermore, ferrite tiles do not have an absorption effect on all frequencies of television radio waves, but are determined by the composition of the ferrite, so it is desirable in the future to have radio wave absorption performance over a wide frequency band.

The present invention has been proposed in view of the problems of the prior art, and its purpose is to provide a dry radio wave absorption panel that is capable of absorbing radio waves in a wide frequency band, is lightweight, and is easy to manufacture. .

(Means for Solving the Problems) In order to achieve the above object, the dry radio wave absorbing panel according to the present invention includes a primary radio wave absorbing material in which fine ferrite particles are sequentially mixed on the back surface of a non-metallic exterior finishing material. , an exterior panel formed by layering a secondary radio wave absorbing material made of ferrite tiles, and an interior panel formed by layering a radio wave reflective layer on the back side of the interior finishing material, with an air layer interposed between them. It is configured in opposition to.

(Function) According to the dry radio wave absorbing panel according to the present invention, the primary radio wave absorbing material containing ferrite fine particles is sequentially layered on the back surface of the non-metallic exterior finishing material in the exterior panel, and the primary radio wave absorbing material is made of ferrite tiles. Radio waves are absorbed by the secondary radio wave absorbing material, and in this case, radio wave absorption in a wide frequency band is made possible by making the composition of the ferrite in the two radio wave absorbing materials different.

In addition, the magnetic permeability and dielectric constant are changed by the intermediate air layer formed between the interior panel, which has a radio wave reflective layer layered on the back side of the interior finishing material, and the exterior panel, thereby improving the radio wave absorption performance of the integral molding. The absorption performance is improved, the insulation effect is improved, and the weight of the radio wave absorption panel is reduced.

(Example) The present invention will be described below with reference to the illustrated embodiments.

(A) is an exterior panel, and the back side of the non-metallic exterior material (1) made of a molded plate such as GRC5FRC is covered with a primary radio wave absorbing material (1) made of a mixture of fine ferrite powder and rock wool as an insulating material. 2) is layered by spraying, and a secondary radio wave absorber (3) made of ferrite tiles is layered on the primary radio wave absorber (2).

(B) is an interior panel, which is a board (5) that forms a sound absorbing layer on the back side of an interior finishing material (4) consisting of a board that serves as an interior finishing material.
), and a radio wave reflecting layer (6) made of aluminum foil and metal mesh is layered on the surface of the board (5).

The exterior panel (A) and the interior panel (B) are joined to each other via a spacing material (7) so that an air layer (8) is interposed between the two panels, and a panel (9) is further attached to the periphery. , a radio wave absorption panel is constructed.

Note that the primary radio wave absorbing material (
2) and the secondary radio wave absorbing material (3) have different compositions of ferrite so that radio waves in a wide frequency band can be absorbed.

Since the illustrated embodiment is constructed as described above, the primary radio wave absorbing material (2) containing ferrite fine particles is sequentially layered on the back surface of the non-metallic exterior finishing material (1) in the exterior panel (A). ) and a secondary radio wave absorbing material made of ferrite tiles, radio waves in a wide frequency band are absorbed, and the air layer (8) interposed between the interior and exterior panels (A) and (B) provides a heat insulating effect. At the same time, the presence of the air layer (8) reduces the weight of the radio wave absorbing panel.

(Effects of the Invention) As described above, the dry radio wave absorbing panel according to the present invention has a nonmetallic exterior material that does not reflect incoming radio waves.
The exterior panel has a primary radio wave absorbing material and a secondary radio wave absorbing material made of ferrite tiles layered in order, and the interior panel has a radio wave reflective layer layered on the back side of the interior finishing material, with air in between. Since the layers are arranged oppositely, the radio waves are absorbed by both the primary and secondary radio wave absorbers of the exterior panel. At this time, by making the compositions of the ferrites in both radio wave absorbing materials different, it is possible to absorb radio waves in a wide frequency band.

In addition, the air layer between the inner and outer drawing panels exhibits a heat insulating effect, and the weight of the entire radio wave absorbing panel is reduced, making it easier to transport and handle, and improving workability.

Furthermore, the dry type radio wave absorbing panel according to the present invention is composed of an exterior panel and an interior panel, and both the intermediate panels can be manufactured separately, which simplifies the manufacturing work of the radio wave absorbing panel.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the dry radio wave absorbing panel according to the present invention, FIG. 2 is a partially cutaway perspective view, and FIG. 3 is a partially enlarged view of FIG. 1. , FIG. 4 is a cross-sectional plan view of a conventional radio wave absorbing PC curtain wall, and FIG. 5 is a view taken along the arrow V-V in FIG. 4. (A) --- Exterior panel (B) --- Interior panel (1) --- Exterior finishing material (2) --- Primary radio wave absorber (3) --- Secondary radio wave absorber ( 4) ---
Interior finishing material (6) --- Radio wave reflective layer (8) --
・Air layer agent Patent attorney Shige Okamoto 2 other people

Claims (1)

[Claims] An exterior panel formed by layering a primary radio wave absorbing material in which fine ferrite particles are mixed in order and a secondary radio wave absorbing material made of ferrite tiles on the back surface of a non-metallic exterior finishing material, and the back surface of an interior finishing material. 1. A dry type radio wave absorbing panel comprising: an interior panel formed by layering a radio wave reflective layer on the interior panel, and an interior panel formed by layering a radio wave reflective layer on the interior panel, and facing each other with an air layer interposed in between.