JPS61292999A - Radio dark room - Google Patents
Radio dark roomInfo
- Publication number
- JPS61292999A JPS61292999A JP13429085A JP13429085A JPS61292999A JP S61292999 A JPS61292999 A JP S61292999A JP 13429085 A JP13429085 A JP 13429085A JP 13429085 A JP13429085 A JP 13429085A JP S61292999 A JPS61292999 A JP S61292999A
- Authority
- JP
- Japan
- Prior art keywords
- radio wave
- wave absorbing
- absorbing material
- radio
- protrusion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、電波吸収性能を向上させた電波暗室に関する
。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an anechoic chamber with improved radio wave absorption performance.
（従来技術〕
最近、電波暗室には低周波帯域の電波吸収材の使用が要
求されている。電波暗室では、室内が広い自由空間とな
るようにできるだけ電波吸収性能のよい電波吸収材を使
わなくてはならない。このため、従来、電波の電界成分
を誘電性損失材料で、磁界成分を磁性損失材料で吸収す
る電波吸収材が使用されている。(Prior art) Recently, there has been a demand for the use of radio wave absorbing materials in low frequency bands in anechoic chambers.In order to create a large free space in the room, radio wave absorbing materials with good radio wave absorption performance are not used as much as possible in anechoic chambers. For this reason, conventionally, radio wave absorbing materials have been used in which the electric field component of radio waves is absorbed by a dielectric loss material, and the magnetic field component is absorbed by a magnetic loss material.
従来の電波吸収材としては、例えば、第５図に示すよう
に四角錐状の突起１を表面に設けたものがある。この電
波吸収材は、例えばポリウレタンからなるもので、誘電
性損失材料としてカーボンブラックやグラファイトを、
磁性損失材料としてフェライトを含有したものである。As a conventional radio wave absorbing material, for example, as shown in FIG. 5, there is a material having square pyramid-shaped projections 1 on its surface. This radio wave absorbing material is made of polyurethane, for example, and carbon black or graphite is used as a dielectric loss material.
It contains ferrite as a magnetic loss material.
そして、その裏面を接着剤を介して電波暗室の内壁面お
よび／又は天井に貼着することにより使用される。Then, it is used by attaching the back side to the inner wall surface and/or ceiling of the anechoic chamber via an adhesive.
しかしながら、このような電波吸収材を用いた電波暗室
では、突起１の縦断面が二等辺三角形をしているために
下記のような欠点がある。However, in a radio wave anechoic chamber using such a radio wave absorbing material, since the longitudinal section of the protrusion 1 is in the form of an isosceles triangle, there are the following drawbacks.
（１）突起１の頂角の二等分線の方向と電波吸収材に入
射する電波の入射方向とのなす角度の大きい箇所があり
、この箇所では電波の鏡面反射の吸収回数が少ないので
吸収性能がわるい。（２）その角度を調整するために、
電波吸収材を内壁面および／又は天井に対し傾斜せしめ
ることも行われているが、この場合、暗室内の有効スペ
ースが小さくなり、また、コスト高ともなってしまう。(1) There is a location where the angle between the direction of the bisector of the apex angle of protrusion 1 and the direction of incidence of the radio wave incident on the radio wave absorbing material is large, and in this location, the number of absorptions of specular reflection of radio waves is small, so absorption is Poor performance. (2) To adjust the angle,
Although the radio wave absorbing material is made to be inclined with respect to the inner wall surface and/or the ceiling, in this case, the effective space within the darkroom becomes smaller and the cost also increases.
本発明は、このような欠点を解消した、電波吸収性能に
優れた電波暗室を提供することを目的とする。An object of the present invention is to provide a radio anechoic chamber that eliminates such drawbacks and has excellent radio wave absorption performance.
このため、本発明は、縦断面が不等辺三角形の円錐状又
は角錐状の突起を表面に有する電波吸収材を、内壁面お
よび／又は天井の少なくとも一部に配設し、前記突起の
頂角の二等分線の方向を前記電波吸収材に入射する電波
の入射方向と一致せしめたことを特徴とする電波暗室を
要旨とするものである。For this reason, the present invention provides a radio wave absorbing material having on its surface a conical or pyramidal protrusion with a longitudinal cross section of a scalene triangle, and disposing the radio wave absorbing material on at least a part of the inner wall surface and/or the ceiling, and the apex angle of the protrusion. The gist of the present invention is a radio anechoic chamber characterized in that the direction of the bisector of the radio wave absorbing material is made to coincide with the direction of incidence of radio waves incident on the radio wave absorbing material.
以下、図面を参照して本発明の構成について詳しく説明
する。Hereinafter, the configuration of the present invention will be explained in detail with reference to the drawings.
第１図は、本発明において用いる電波吸収材の一例の側
面視説明図である。この第１図において、Ａは、ポリウ
レタンやポリスチロールとカーボンブラック、グラファ
イト等で構成された誘電材料とフェライト等の磁性材料
とからなる電波吸収材である。この電波吸収材Ａでは・
横断面が矩形の板状の本体２０表面に縦断面が不等辺三
角形の四角錐状の突起ｌが設けられている。ｍは、この
突起１の頂角の二等分線を示す。また、本体２の裏面に
は、本体２の保護のために、横断面が矩形の板状の裏当
層３が貼着されている。なお、これらの突起１、本体２
、および裏当層３の複素誘電率は、それぞれ相違する。FIG. 1 is an explanatory side view of an example of the radio wave absorbing material used in the present invention. In FIG. 1, A is a radio wave absorbing material made of a dielectric material such as polyurethane or polystyrene, carbon black or graphite, and a magnetic material such as ferrite. In this radio wave absorbing material A,
A quadrangular pyramid-shaped protrusion l having a scalene triangular longitudinal section is provided on the surface of the main body 20 which is a plate-like member having a rectangular cross section. m indicates the bisector of the apex angle of this protrusion 1. Further, a plate-shaped backing layer 3 having a rectangular cross section is adhered to the back surface of the main body 2 in order to protect the main body 2. In addition, these protrusions 1, main body 2
, and the complex permittivity of the backing layer 3 are different from each other.
第２図は、本発明の電波暗室の一例を示す平面視説明図
である。この第２図において、４は直方体状の電波暗室
である。この電波暗室４では、発射点５からの電波が内
壁面で反射して受信点６に到達する際の内壁面での反射
波を減衰させるべく、内壁面における電波の一次反射箇
所に複数個の電波吸収材Ａが配設されている。FIG. 2 is an explanatory plan view showing an example of the anechoic chamber of the present invention. In this FIG. 2, 4 is a rectangular parallelepiped-shaped anechoic chamber. In this anechoic chamber 4, in order to attenuate the reflected wave from the inner wall surface when the radio wave from the emission point 5 is reflected by the inner wall surface and reaches the reception point 6, a plurality of radio waves are installed at the primary reflection point of the radio wave on the inner wall surface. A radio wave absorbing material A is provided.
そして、電波吸収材Ａの突起１の頂角の二等分線ｍの方
向を、発射点５から電波吸収材Ａに入射する電波ｌの入
射方向と一致せしめている。The direction of the bisector m of the apex angle of the protrusion 1 of the radio wave absorbing material A is made to coincide with the direction of incidence of the radio wave l entering the radio wave absorbing material A from the emission point 5.
電波吸収材Ａは、電波の一次反射が大きい範囲の内壁面
および／又は天井に配設すればよい。The radio wave absorbing material A may be disposed on the inner wall surface and/or the ceiling in a range where the primary reflection of radio waves is large.
また、その他の内壁面および／又は天井には、第５図に
示すような縦断面が二等辺三角形の四角錐状の突起１を
表面に設けた電波吸収材Ｂを配置すればよい。これらの
電波吸収材ＡおよびＢは、複数個でよ（、また、その種
類および配置箇所は内壁面および／又は天井のうちいず
れでもよい。Further, on other inner wall surfaces and/or the ceiling, a radio wave absorbing material B having a square pyramid-shaped protrusion 1 having an isosceles triangular longitudinal section as shown in FIG. 5 on its surface may be placed. A plurality of these radio wave absorbing materials A and B may be used (and their type and location may be either on the inner wall surface and/or on the ceiling).
第３図は、電波吸収材の表面の突起の頂角の二等分線の
方向と同方向から電波ｌが入射したときの鏡面反射によ
る吸収回数ｎと頂角θ′ との関係を示したものである
。θ′＝３０°とすると、ｎ＝１８０ °／θ”から
ｎ＝６回となる。一方、第４図に示すように、頂角の二
等分線の方向に対し４５°の方向から電波ｌが入射する
とｎ−３回となり、吸収回数が少なくなる。したがって
、電波吸収材Ａを第２図に示すように配置することによ
り、電波暗室の吸収性能を高めることができる。Figure 3 shows the relationship between the number of absorptions n due to specular reflection and the apex angle θ' when a radio wave l is incident from the same direction as the bisector of the apex angle of the protrusion on the surface of the radio wave absorbing material. It is something. If θ' = 30°, n = 6 times from n = 180°/θ''. On the other hand, as shown in Figure 4, radio waves are emitted from a direction 45° to the direction of the bisector of the apex angle. When l is incident, the number of absorptions becomes n-3 times, which reduces the number of absorptions.Therefore, by arranging the radio wave absorbing material A as shown in FIG. 2, the absorption performance of the radio wave anechoic chamber can be improved.
以上説明したように本発明によれば、縦断面が不等辺三
角形の突起を有する電波吸収材を、内壁面および／又は
天井の少な（とも一部に配設し、この突起の頂角の二等
分線の方向を電波吸収材に入射する電波の入射方向と一
致せしめたため、下記の効果を奏することができる。As explained above, according to the present invention, a radio wave absorbing material having a protrusion having a scalene triangular longitudinal section is disposed on a small portion (both a part) of an inner wall surface and/or ceiling, and the apex angle of the protrusion is Since the direction of the equal dividing line is made to coincide with the direction of incidence of radio waves incident on the radio wave absorbing material, the following effects can be achieved.
（１） 電波の反射波を十分に減衰させることができ
るので電波暗室の電波吸収性能を向上させることができ
る。(1) Since reflected waves of radio waves can be sufficiently attenuated, the radio wave absorption performance of the anechoic chamber can be improved.
（２）電波暗室の内壁面および／又は天井の加工を何ら
必要としないので経済的である。(2) It is economical because it does not require any processing of the inner wall surface and/or ceiling of the anechoic chamber.
（３）電波暗室内の有効スペースを変えることがない。(3) The effective space within the anechoic chamber does not change.
第１図は本発明において用いる電波吸収材の一例の側面
視説明図、第２図は本発明の電波暗室の一例を示す平面
視説明図、第３図および第４図は、それぞれ、電波吸収
材の表面の突起と電波の入射角度との関係を示した説明
図、第５図は従来の電波吸収材の一例の斜視図である。
ｌ・・・突起、２・・・板状の本体、３・・・裏当層、
４・・・電波暗室、５・・・発射点、６・・・受信点、
Ａ・・・電波吸収材、Ｂ・・・電波吸収材。FIG. 1 is a side view explanatory diagram of an example of the radio wave absorbing material used in the present invention, FIG. 2 is a plan view explanatory diagram showing an example of the radio wave anechoic chamber of the present invention, and FIGS. 3 and 4 are respectively FIG. 5 is an explanatory diagram showing the relationship between protrusions on the surface of the material and the angle of incidence of radio waves, and FIG. 5 is a perspective view of an example of a conventional radio wave absorbing material. l...Protrusion, 2...Plate-shaped main body, 3...Backing layer,
4... Anechoic chamber, 5... Emitting point, 6... Receiving point,
A... Radio wave absorbing material, B... Radio wave absorbing material.
Claims (1)
面に有する電波吸収材を、内壁面および／又は天井の少
なくとも一部に配設し、前記突起の頂角の二等分線の方
向を前記電波吸収材に入射する電波の入射方向と一致せ
しめたことを特徴とする電波暗室。A radio wave absorbing material having a conical or pyramidal protrusion with a scalene triangular longitudinal section on its surface is disposed on at least a part of the inner wall surface and/or the ceiling, and the direction of the bisector of the apex angle of the protrusion is A radio anechoic chamber characterized in that the direction of incidence of radio waves is made to coincide with the direction of incidence of radio waves incident on the radio wave absorbing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13429085A JPS61292999A (en) | 1985-06-21 | 1985-06-21 | Radio dark room |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13429085A JPS61292999A (en) | 1985-06-21 | 1985-06-21 | Radio dark room |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61292999A true JPS61292999A (en) | 1986-12-23 |
Family
ID=15124821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13429085A Pending JPS61292999A (en) | 1985-06-21 | 1985-06-21 | Radio dark room |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61292999A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01207995A (en) * | 1988-02-16 | 1989-08-21 | Meidensha Corp | Construction method of radio wave-acoustic wave anechoic room |
| CN104005483A (en) * | 2014-05-07 | 2014-08-27 | 中国人民解放军63892部队 | Method for improving anechoic chamber silent area performance and modularization dielectric fences |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5799800A (en) * | 1980-12-12 | 1982-06-21 | Nippon Electric Co | Radio wave absorber |
-
1985
- 1985-06-21 JP JP13429085A patent/JPS61292999A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5799800A (en) * | 1980-12-12 | 1982-06-21 | Nippon Electric Co | Radio wave absorber |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01207995A (en) * | 1988-02-16 | 1989-08-21 | Meidensha Corp | Construction method of radio wave-acoustic wave anechoic room |
| CN104005483A (en) * | 2014-05-07 | 2014-08-27 | 中国人民解放军63892部队 | Method for improving anechoic chamber silent area performance and modularization dielectric fences |
| CN104005483B (en) * | 2014-05-07 | 2016-08-17 | 中国人民解放军63892部队 | A kind of method for improving microwave dark room quiet zone performance and modularity medium fence |
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