JPH03165599A - Radio wave absorbent material, manufacture thereof, and radio wave absorbing board formed thereof - Google Patents
Radio wave absorbent material, manufacture thereof, and radio wave absorbing board formed thereofInfo
- Publication number
- JPH03165599A JPH03165599A JP30598189A JP30598189A JPH03165599A JP H03165599 A JPH03165599 A JP H03165599A JP 30598189 A JP30598189 A JP 30598189A JP 30598189 A JP30598189 A JP 30598189A JP H03165599 A JPH03165599 A JP H03165599A
- Authority
- JP
- Japan
- Prior art keywords
- radio wave
- wave absorbing
- semi
- semicylindrical
- electromagnetic wave
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 230000002745 absorbent Effects 0.000 title abstract description 7
- 239000002250 absorbent Substances 0.000 title abstract description 7
- 239000000696 magnetic material Substances 0.000 claims abstract description 9
- 239000011358 absorbing material Substances 0.000 claims description 52
- 238000010521 absorption reaction Methods 0.000 claims description 21
- 239000006096 absorbing agent Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 11
- 239000000843 powder Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 239000011230 binding agent Substances 0.000 abstract description 5
- 229920002678 cellulose Polymers 0.000 abstract description 3
- 239000001913 cellulose Substances 0.000 abstract description 3
- 230000002238 attenuated effect Effects 0.000 abstract description 2
- 239000003292 glue Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000004380 ashing Methods 0.000 abstract 1
- 239000004927 clay Substances 0.000 abstract 1
- 230000001939 inductive effect Effects 0.000 abstract 1
- 230000005389 magnetism Effects 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 20
- 239000000758 substrate Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、電波暗室の構築、ＴＶ電波の受渡等に使用さ
れる電波吸収材及び、その製造方法並びに該電波吸収材
を用いた電波吸収板に関する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a radio wave absorbing material used for constructing an anechoic chamber, transmitting TV radio waves, etc., a method for manufacturing the same, and a method for absorbing radio waves using the radio wave absorbing material. Regarding the board.
［従来技術］
電波吸収材は、入射された電波を吸収し、消失させるも
のであり、広い帯域の周波数を吸収するＷ形電波吸収材
にあっては、電波暗室の様にアンテナ等の特性を調べる
ために、外部からの電波を遮断して無響空間を構成する
ための構造材として利用される。また、特定の周波数の
みを吸収するＮ形電波吸収材にあっては、建物によるＴ
Ｖ電波の反射防止等に利用され、いずれも広い用途を有
する。[Prior art] A radio wave absorbing material absorbs and eliminates incident radio waves, and W-shaped radio wave absorbing materials that absorb a wide range of frequencies are used to improve the characteristics of antennas, etc., like in an anechoic chamber. It is used as a structural material to create an anechoic space by blocking radio waves from outside for research purposes. In addition, for N-type radio wave absorbing materials that absorb only specific frequencies, the T
They are used to prevent the reflection of V radio waves, and both have a wide range of uses.
これらの電波吸収材は、入射された電波に、導電損また
は磁性損を生じさせて、光エネルギーを熱エネルギーに
変換することにより、前記吸収能を達成するのであって
、導電損を生じさせる電波吸収材としてカーボンを成形
基材に混合したものがあり、また誘電損を生じさせるも
のとしてフェライト等の粉末を成形基材に混合したもの
等がある。These radio wave absorbing materials achieve the above-mentioned absorption ability by causing conduction loss or magnetic loss in the incident radio waves and converting optical energy into thermal energy. There are materials in which carbon is mixed into a molded base material as an absorbent, and there are materials in which powder such as ferrite is mixed in a molded base material as a material that causes dielectric loss.
ところが、これらの電波吸収材は成形基材に混合して所
定形状とするものであるが、いずれも十分な吸収能を達
成してるとは言えない、また、従来の構成では、電磁波
は、その電波吸収材の内部を透過する行程で、熱エネル
ギーに変換され、消耗するものであり、吸収材の厚さｄ
は、電磁波の波長えとの関係を有し、従来はｄ／んを性
能指数とし、所定の性能を達成するためには、厚さｄを
かなり厚くする必要があるとされてきた６例＾ば、無損
失材の表面に、カーボンシート等の抵抗膜を配設した構
成にあっては、理論上え／４の厚さを要し、周波数ｆ
＝ １００ＭＨｚの電磁波を適用する場合には、７５ｃ
ｌＴｌもの厚さが必要となる。However, these radio wave absorbing materials are mixed into a molded base material and shaped into a predetermined shape, but none of them can be said to have achieved sufficient absorption ability.In addition, with conventional configurations, electromagnetic waves are In the process of passing through the inside of the radio wave absorbing material, it is converted into thermal energy and consumed, and the thickness of the absorbing material d
has a relationship with the wavelength of electromagnetic waves, and conventionally, d/n has been used as a figure of merit, and in order to achieve a specified performance, it has been said that the thickness d needs to be considerably thick. , in a structure in which a resistive film such as a carbon sheet is disposed on the surface of a lossless material, a thickness of E/4 is theoretically required, and the frequency f
= 75c when applying 100MHz electromagnetic waves
A thickness of lTl is required.
本発明は、電波吸収効率が良く、しかも建築用構造材と
しても有用で、かつ製造が容易な電波吸収材を提供する
ことを目的とするものである。An object of the present invention is to provide a radio wave absorbing material that has good radio wave absorption efficiency, is useful as a structural material for buildings, and is easy to manufacture.
［課題を解決するための手段］
本発明は表面にフェライト等の酸化物磁性材料からなる
電磁吸収層が形成された半円柱状（カマボコ状）からな
ることを特徴とする電波吸収材である。[Means for Solving the Problems] The present invention is a radio wave absorbing material characterized by having a semi-cylindrical shape (semi-cylindrical shape) on the surface of which an electromagnetic absorption layer made of an oxide magnetic material such as ferrite is formed.
この電波吸収材を可及的に軽量とするために、牛骨粉、
セルロース等の材料からなる半円柱状の可焼担持体の表
面にフェライト等の酸化物磁性材料からなる被膜を形成
し、これを加熱して焼成することにより半円柱状に形成
することができる。In order to make this radio wave absorbing material as lightweight as possible, we used cow bone powder,
A film made of an oxide magnetic material such as ferrite is formed on the surface of a semi-cylindrical burnable support made of a material such as cellulose, and the film is heated and fired to form a semi-cylindrical shape.
そしてこの半円柱状電波吸収材を、その水平面を据付は
基板上に当てて多数並設し、該基板上に成形基材を一定
厚で供給することにより構造材として使用可能な電波吸
収板が成形されることとなる。Then, a large number of semi-cylindrical radio wave absorbing materials are placed side by side with their horizontal surfaces placed on a substrate, and by supplying a molded base material with a constant thickness on the substrate, a radio wave absorbing plate that can be used as a structural material is created. It will be molded.
［作用］
第１図に示すように、半円柱状電波吸収材Ｘの円弧面側
から入射した電磁波（α）は、その入射角の関係で、酸
化物磁性材料から成る電磁吸収層ｙ内で反射を繰り返し
て、層内に閉じ込められた状態となりながら、誘電損を
生じて減衰し消失する。または該電磁吸収層ｙを透過し
た電磁波（β）も内層Ｚ内に入射し、該内層Ｚと電磁吸
収層ｙとの境界面内で反射を繰り返すか電磁吸収層ｙに
再入射する等して、結局同様に減衰することとなる。[Function] As shown in Fig. 1, the electromagnetic wave (α) incident from the arc surface side of the semi-cylindrical radio wave absorbing material It repeats reflection, becomes confined within the layer, causes dielectric loss, attenuates, and disappears. Alternatively, the electromagnetic wave (β) that has passed through the electromagnetic absorption layer y also enters the inner layer Z, and is repeatedly reflected within the interface between the inner layer Z and the electromagnetic absorption layer y, or enters the electromagnetic absorption layer y again. , it ends up being attenuated in the same way.
そこで、この電波吸収材Ｘを円弧面を電磁波の入射方向
に向けて面方向に多数音に並設することにより、電磁波
の透過を遮断することができる。Therefore, by arranging a plurality of radio wave absorbing materials X in parallel in the plane direction with the arcuate surfaces facing the direction of incidence of electromagnetic waves, transmission of electromagnetic waves can be blocked.
また、前記電波吸収材Ｘを製造するにあたって、牛骨粉
、セルロース等の半円柱状可焼担持体の表面に酸化物磁
性材料からなる被膜を形成し、これを加熱して焼成する
と、該相持体の脱水、炭化等により内層Ｚが練状となり
、該電波吸収材Ｘの重量の軽減化を図ることができる。In addition, in producing the radio wave absorbing material By dehydration, carbonization, etc., the inner layer Z becomes a dough, and the weight of the radio wave absorbing material X can be reduced.
そしてこの電波吸収材を用いて電波吸収板を形成した場
合には、上述の作用による電磁吸収能力を生じるほかに
、電波吸収材自体が芯材となって板材の強度を向上でき
、構造材として最適となる。When a radio wave absorbing plate is formed using this radio wave absorbing material, in addition to producing the electromagnetic absorption ability due to the above-mentioned effect, the radio wave absorbing material itself becomes a core material to improve the strength of the plate material, and can be used as a structural material. Optimal.
［実施例］
前記半円柱状電波吸収材Ｘの製造方法の一例を第２図に
位って説明する。[Example] An example of a method for manufacturing the semi-cylindrical radio wave absorbing material X will be described with reference to FIG.
まず牛骨粉、セルロース等を糊、水等で練って半円柱状
担持体１を成形する（イ）０次に、フェライト粉にバイ
ンダーを混入して粘度状にした材料２を貯留した槽３（
ロ）内に半円柱状担持体１を漬け、該半円柱状担持体■
の表面に均一に材料４を塗着形成する（ハ）、これを、
炉５内で加熱して、該担持体ｌを焼成して脱水炭化させ
、かつ材料４中のバインダーを焼失させて焼結フェライ
ト層（酸化物磁性材料からなる電磁吸収層ｙ）を形成し
、而して半円柱状電波吸収材Ｘが製造される（二）。First, cow bone powder, cellulose, etc. are kneaded with glue, water, etc. to form a semi-cylindrical support 1 (a).Next, a tank 3 in which material 2 made by mixing ferrite powder with a binder to make it viscous is stored (
B) Immerse the semi-cylindrical carrier 1 in the semi-cylindrical carrier (ii).
Apply and form material 4 uniformly on the surface of (c).
heating in a furnace 5 to sinter the support 1 to dehydrate and carbonize it, and burn off the binder in the material 4 to form a sintered ferrite layer (electromagnetic absorption layer y made of an oxide magnetic material); Thus, the semi-cylindrical radio wave absorbing material X is manufactured (2).
かかる構成の半円柱状電波吸収材Ｘにあっては、内層Ｚ
は担持体１の焼成により内空状となるか、または空隙率
の高い練状となって、その軽量化が実現できる。In the semi-cylindrical radio wave absorbing material X having such a configuration, the inner layer Z
When the carrier 1 is fired, it becomes hollow, or becomes a dough with a high porosity, and its weight can be reduced.
尚、内層Ｚは内実状としても良く、この場合に電波吸収
能を有するカーボン、フェライト粉を混入した担持材に
よって構成することもできる。In addition, the inner layer Z may be in a solid state, and in this case, it may also be constituted by a supporting material mixed with carbon or ferrite powder having radio wave absorbing ability.
前記半円柱状電波吸収材Ｘは、内層Ｚとなる担持材の表
面に、ゴムフェライトからなる電磁吸収板ｙを形成する
ことにより構成しても良い、該ゴムフェライトは、焼結
フェライトとは異なり、２ＧＨｚ〜５ＧＨｚの周波数帯
域の電磁波を吸収し得る能力が知られており、この材料
選定により次記する半円柱状電波吸収材Ｘの径の選定等
と共に、用途に応じた特性を達成し得ることとなる。The semi-cylindrical radio wave absorbing material , is known to have the ability to absorb electromagnetic waves in the frequency band of 2 GHz to 5 GHz, and by selecting this material, along with selecting the diameter of the semi-cylindrical radio wave absorbing material X described below, it is possible to achieve characteristics according to the application. It happens.
この半円柱状電波吸収材Ｘは、その半径や、電磁吸収層
ｙの厚みにより、吸収可能な電磁波の周波数を変化させ
ることができる。このため、電波暗室、電波つい立て等
の材料として用いるために広い帯域の周波数を吸収する
ものＣＷ形電波吸収板）を形成する場合には、半径及び
電磁吸収層ｙの厚みが異なる種々の種類の半円柱状電波
吸収材Ｘを成形基材２内に多層状に列設（第４図参照）
させればよい、また、特定の周波数のみを吸収するため
に用いるもの（Ｎ形電波吸収板）を形成する場合には、
所定の半円柱状電波吸収材Ｘのみを並設させれば良い、
すなわち、半円柱状電波吸収材Ｘの径や、電磁吸収層ｙ
の厚みを選定することにより、有効周波数帯域幅を設定
することができ、Ｗ形電波吸収板、Ｎ形電波吸収板のい
ずれをも形成することができて、用途に応じた特性を容
易に生じさせることができる。This semi-cylindrical radio wave absorbing material X can change the frequency of electromagnetic waves that it can absorb by changing its radius and the thickness of the electromagnetic absorption layer y. For this reason, when forming a CW type radio wave absorbing plate that absorbs a wide range of frequencies to be used as a material for anechoic chambers, radio wave stations, etc., various types with different radii and thicknesses of the electromagnetic absorption layer y are used. The semi-cylindrical radio wave absorbing material
Also, when forming something used to absorb only a specific frequency (N-type radio wave absorption plate),
It is sufficient to arrange only the predetermined semi-cylindrical radio wave absorbing materials X in parallel.
In other words, the diameter of the semi-cylindrical radio wave absorbing material X and the electromagnetic absorption layer y
By selecting the thickness of the plate, the effective frequency bandwidth can be set, and both W-type and N-type radio wave absorbing plates can be formed, making it easy to create characteristics according to the application. can be done.
次に電波吸収材Ｘの実際の適用態様を示す。Next, the actual application mode of the radio wave absorbing material X will be shown.
第３図は、第１図で既に示した酸化物磁性材料からなる
電磁吸収層ｙが表面に形成された半円柱状電波吸収材Ｘ
を、所要の取付は面１０にその円弧面を電波の入射方向
に向けて多数密接状に並設したものである。このように
電波吸収材Ｘ自体を施工材として用いることができ、こ
の適用態様にあっても第１図に示した電磁遮繭作用が有
効となる。FIG. 3 shows a semi-cylindrical radio wave absorbing material
The required installation method is to arrange a large number of them closely side by side on the surface 10 with their arcuate surfaces facing the direction of incidence of the radio waves. In this way, the radio wave absorbing material X itself can be used as a construction material, and the electromagnetic shielding effect shown in FIG. 1 is effective even in this application mode.
この電波吸収材Ｘはビルの壁面に配設して所要周波数の
ＴＶ電波を吸収する吸取体として用いることもでき、こ
の場合には壁面に所定間隔で並設すれば良い。This radio wave absorbing material X can be placed on the wall of a building and used as an absorber for absorbing TV radio waves of a desired frequency, and in this case, it may be placed in parallel on the wall at predetermined intervals.
この電波吸収材Ｘは第４図に示すように、コンクリート
等の成形基材１１内に円弧面を電磁波の入射方向に向く
ようにして多数埋設して用いても良い、この場合には、
該電波吸収材Ｘを多重層状に列設することもできる。As shown in FIG. 4, this radio wave absorbing material
The radio wave absorbing material X can also be arranged in multiple layers.
第５図は電波吸収材Ｘを利用して電磁吸収板１２を形成
するようにしたものである。すなわち鉄板、銅板または
導電性ゴムシート等の導電性据付は基板１３の一表面に
電波吸収材Ｘの水平面を当てて同一方向に列設し、この
上にさらに一定厚で砂利、砂、及び有機バインダーから
なる成形基材１４を充填して該吸収材群を成形基材１４
内に埋火し、゛必要によりその表面にフェライトタイル
等の仕上材１５を配設することにより構成したものであ
る。この電磁吸収板１２の成形手順としては、前記据付
は基板１３自体を型板とし、他の表面側型板（仕上材１
５を適用しても良い）との間に電波吸収材Ｘを介装して
型板間に成形基材１４を供給すれば良い、而して成形基
材１４の乾燥凝固によって電磁吸収板１２が形成される
。In FIG. 5, an electromagnetic absorbing plate 12 is formed using a radio wave absorbing material X. In other words, to install conductive materials such as iron plates, copper plates, or conductive rubber sheets, the horizontal surface of the radio wave absorbing material X is applied to one surface of the board 13, and the radio wave absorbing material A molded base material 14 made of a binder is filled to form the absorbent group into the molded base material 14.
It is constructed by burying the fire inside and placing a finishing material 15 such as ferrite tiles on the surface if necessary. The procedure for forming the electromagnetic absorbing plate 12 is such that the installation uses the substrate 13 itself as a template, and another front side template (finishing material 1).
The electromagnetic absorption plate 12 may be applied by drying and solidifying the forming base material 14 by interposing the electromagnetic wave absorbing material X between the templates. is formed.
前記成形基材１４としては１合成樹脂材料、天然ゴム、
合成ゴム等も用いられ得る。As the molding base material 14, 1 synthetic resin material, natural rubber,
Synthetic rubber and the like may also be used.
かかる構成にあっては電磁吸収板１２の裏面に用いられ
た鉄板、銅板または導電性ゴムシート等の導電性据付は
基板１３により電磁シールド効果を生じさせることがで
きる。In such a configuration, the electromagnetic shielding effect of the substrate 13 can be produced by installing a conductive material such as an iron plate, a copper plate, or a conductive rubber sheet on the back surface of the electromagnetic absorption plate 12.
また成形基材１４の一成分としてカーボン、フェライト
等の粉末を混入すると、電波は、各粉末との衝突により
、誘電損または誘電損を生じて、その減衰がさらに効率
的になされることとなる。Furthermore, if powders such as carbon or ferrite are mixed as a component of the molding base material 14, radio waves will collide with each powder, causing dielectric loss or dielectric loss, and the attenuation will be made more efficient. .
［発明の効果］
本発明の電波吸収材Ｘは、上述の様に電磁吸収層ｙが表
層に形成された半円柱状としたものであるから、電磁波
は電波吸収材Ｘ内に入射し、その電磁吸収層ｙ内で、反
射を繰り返して減衰することにより、その有効減衰行路
を長くすることができ、電磁波の吸収能が飛躍的に向上
し、このため、これが適用される壁面の薄厚化を実現で
きる。また半円柱状電波吸収材Ｘの径や、電磁吸収層ｙ
の厚みを選定したり、複数の径の半円柱状電波吸収材Ｘ
を混在させる等により、用途に応じた特性を生じさせる
ことができ、高層建物の側壁に使用して、テレビ電波の
反射による受信障害を防ぐ等、その利用分野が拡大する
。[Effects of the Invention] Since the radio wave absorbing material X of the present invention has a semi-cylindrical shape with the electromagnetic absorption layer y formed on the surface layer as described above, electromagnetic waves enter the radio wave absorbing material By repeatedly reflecting and attenuating within the electromagnetic absorption layer y, the effective attenuation path can be lengthened, dramatically improving the ability to absorb electromagnetic waves. realizable. Also, the diameter of the semi-cylindrical radio wave absorbing material X and the electromagnetic absorption layer y
You can select the thickness of the semi-cylindrical radio wave absorbing material with multiple diameters.
By mixing them together, it is possible to create characteristics depending on the application, and the field of use is expanding, such as when used on the side walls of high-rise buildings to prevent reception interference due to reflection of television radio waves.
さらには、半円柱状担持体の表面に酸化物磁性材料から
なる被膜を形成し、これを加熱して焼成した半円柱状電
波吸収材は軽量となり、前記半円柱状電波吸収材を備え
た吸収板にあって、その軽量化を図ることができる。Furthermore, the semi-cylindrical radio wave absorbing material formed by forming a film made of an oxide magnetic material on the surface of the semi-cylindrical support and heating and firing the film becomes lightweight, and the absorber equipped with the semi-cylindrical radio wave absorbing material can be made lightweight. It is possible to reduce the weight of the plate.
しかも、容易に面方向に配設できるから板状に成形する
ことが簡単である。Moreover, since it can be easily arranged in the plane direction, it is easy to form it into a plate shape.
そして、この電波吸収材Ｘを同一方向に列設して成形基
材により所定厚に形成した電波吸収板は、板状であるた
めに取扱が容易であり、しかも吸収材Ｘ自体が補強芯材
となって高い強度を示し、このため無響空間等を構成す
るための構造材として種々の用途に適用し得る。The radio wave absorbing plate, which is formed by arranging the radio wave absorbing materials X in the same direction and forming a predetermined thickness using a molded base material, is easy to handle because it is plate-shaped, and the absorbing material X itself is made of a reinforcing core material. It exhibits high strength and can therefore be applied to various uses as a structural material for constructing anechoic spaces and the like.
添付図面は本発明の実施例を示し、第１図は半円柱状電
波吸収材Ｘの作用を示す斜視図、第２図は電波吸収材Ｘ
の製造工程を示す説明図、第３゜４図は電波吸収材Ｘの
応用例を示す縦断側面図、第５図は電磁吸収板１２の一
例を示す縦断側面図である。
・・・半円柱状電波吸収材
・・・内層
・・−半円柱状担持体
ｌ・・・成形基材
２・・・電波波吸収板
３・・・据付は基板
４・・・成形基材
ｙ・・−電磁吸収層
第
図
第
図The attached drawings show embodiments of the present invention, and FIG. 1 is a perspective view showing the action of the semi-cylindrical radio wave absorbing material X, and FIG. 2 is a perspective view of the radio wave absorbing material X.
FIGS. 3-4 are longitudinal sectional side views showing an example of application of the radio wave absorbing material X, and FIG. 5 is a longitudinal sectional side view showing an example of the electromagnetic absorbing plate 12. ...Semi-cylindrical radio wave absorbing material...Inner layer...-Semi-cylindrical support l...Molding base material 2...Radio wave absorbing plate 3...Substrate 4...Molding base material y...-Electromagnetic absorption layer diagram diagram
Claims (1)
れた半円柱状からなることを特徴とする電波吸収材。 ２）半円柱状の可焼担持体の表面に酸化物磁性材料から
なる被膜を形成し、これを加熱して焼成することにより
半円柱状に形成したことを特徴とする特許請求の範囲第
１項記載の電波吸収体の製造方法。 ３）表面に酸化物磁性材料からなる電磁吸収層が形成さ
れた半円柱状電波吸収材を、その水平面を据付け基板上
に当てて多数並設し、該基板上に成形基材を一定厚で供
給して成形したことを特徴とする電波吸収板。[Scope of Claims] 1) A radio wave absorbing material characterized by having a semi-cylindrical shape on which an electromagnetic absorption layer made of an oxide magnetic material is formed. 2) A film made of an oxide magnetic material is formed on the surface of a semi-cylindrical burnable carrier, and the film is heated and fired to form a semi-cylindrical shape. A method for producing a radio wave absorber as described in Section 1. 3) A large number of semi-cylindrical radio wave absorbing materials each having an electromagnetic absorption layer made of an oxide magnetic material formed on the surface are arranged side by side with their horizontal surfaces facing an installation board, and a molded base material is placed on the board with a constant thickness. A radio wave absorbing plate characterized by being supplied and molded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1305981A JP2814119B2 (en) | 1989-11-24 | 1989-11-24 | Radio wave absorbing material, method of manufacturing the same, and radio wave absorbing plate using the radio wave absorbing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1305981A JP2814119B2 (en) | 1989-11-24 | 1989-11-24 | Radio wave absorbing material, method of manufacturing the same, and radio wave absorbing plate using the radio wave absorbing material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03165599A true JPH03165599A (en) | 1991-07-17 |
| JP2814119B2 JP2814119B2 (en) | 1998-10-22 |
Family
ID=17951632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1305981A Expired - Fee Related JP2814119B2 (en) | 1989-11-24 | 1989-11-24 | Radio wave absorbing material, method of manufacturing the same, and radio wave absorbing plate using the radio wave absorbing material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2814119B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8138959B2 (en) * | 2006-10-19 | 2012-03-20 | Hitachi Metals, Ltd. | Radio wave absorption material and radio wave absorber |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002250089A (en) * | 2001-02-27 | 2002-09-06 | Takechi Kogyo Gomu Co Ltd | Radio wave absorber |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01220899A (en) * | 1988-02-29 | 1989-09-04 | Kenichi Noda | Wave absorber and manufacture thereof |
| JPH0273699A (en) * | 1988-09-09 | 1990-03-13 | Nec Corp | Electric wave absorber |
-
1989
- 1989-11-24 JP JP1305981A patent/JP2814119B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01220899A (en) * | 1988-02-29 | 1989-09-04 | Kenichi Noda | Wave absorber and manufacture thereof |
| JPH0273699A (en) * | 1988-09-09 | 1990-03-13 | Nec Corp | Electric wave absorber |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8138959B2 (en) * | 2006-10-19 | 2012-03-20 | Hitachi Metals, Ltd. | Radio wave absorption material and radio wave absorber |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2814119B2 (en) | 1998-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2685801A2 (en) | Electromagnetic wave absorber | |
| EP0982801B1 (en) | Incombustible honeycomb radio absorptive material and radio absorber using the same | |
| TW200947803A (en) | Combined electromagnetic wave absorber | |
| GB795510A (en) | Improvements in or relating to arrangements for reducing or preventing the reflection of electromagnetic waves | |
| KR100472198B1 (en) | Radio wave absorbent-assembling member, radio wave absorbent and method for producing the same | |
| CN1290670A (en) | Reticular microwave-absorbing body ceramic and its producing method | |
| US6359581B2 (en) | Electromagnetic wave abosrber | |
| JPH09186484A (en) | Wide band electronic waves absorber | |
| US6784419B1 (en) | Electromagnetic wave absorber | |
| US20050008845A1 (en) | Electromagnetic-wave absorber | |
| JPH03165599A (en) | Radio wave absorbent material, manufacture thereof, and radio wave absorbing board formed thereof | |
| JPH10290094A (en) | Electromagnetic-wave absorbing material and its manufacture | |
| JP2618674B2 (en) | Manufacturing method of radio wave absorber | |
| JP2001244686A (en) | Radio wave absorber, radio wave dark box, radio wave darkroom, radio wave absorption panel, and radio wave absorbing screen | |
| JP2009088107A (en) | Radio wave absorber, its accommodating method, and radio wave dark room | |
| US5892188A (en) | Porous ferrite wave absorber | |
| JP2001230588A (en) | Electromagnetic wave absorbing body and its manufacturing method | |
| JPH07193388A (en) | Micro wave and millimeter wave absorber | |
| JP4004096B2 (en) | Radio wave absorber | |
| JP2003115693A (en) | Wave absorber | |
| JPH11274788A (en) | Electromagnetic wave absorbing material and method therefor | |
| JPH08130389A (en) | Porous ferrite radio wave absorber | |
| JPH0369197A (en) | Hollow polypyramid type radio wave absorbing body | |
| JP2021170614A (en) | Power-resistant radio wave absorber | |
| JPH08130388A (en) | Porous ferrite radio wave absorber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |