JPH01220899A - Wave absorber and manufacture thereof - Google Patents
Wave absorber and manufacture thereofInfo
- Publication number
- JPH01220899A JPH01220899A JP4720488A JP4720488A JPH01220899A JP H01220899 A JPH01220899 A JP H01220899A JP 4720488 A JP4720488 A JP 4720488A JP 4720488 A JP4720488 A JP 4720488A JP H01220899 A JPH01220899 A JP H01220899A
- Authority
- JP
- Japan
- Prior art keywords
- granular
- electromagnetic
- oxide magnetic
- wave absorber
- magnetic material
- 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
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 33
- 238000010521 absorption reaction Methods 0.000 claims abstract description 19
- 239000000696 magnetic material Substances 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 239000008187 granular material Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 11
- 239000011230 binding agent Substances 0.000 abstract description 4
- 210000000988 bone and bone Anatomy 0.000 abstract description 4
- 229920002678 cellulose Polymers 0.000 abstract description 4
- 239000001913 cellulose Substances 0.000 abstract description 4
- 238000003763 carbonization Methods 0.000 abstract 1
- 230000018044 dehydration Effects 0.000 abstract 1
- 238000006297 dehydration reaction Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 24
- 239000000843 powder Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000002745 absorbent Effects 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 235000015278 beef Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 241000283690 Bos taurus Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 235000010575 Pueraria lobata Nutrition 0.000 description 1
- 241000219781 Pueraria montana var. lobata Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 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
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000011343 solid material 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
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、電波暗室の構築等に使用される電波吸収体及
び、その製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a radio wave absorber used for constructing an anechoic chamber, and a method for manufacturing the same.
〈従来技術〉
電波吸収体は、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
体にあっては、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形電波吸収体にあっては、建物によ
るＴＶ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 absorber absorbs and eliminates incident radio waves.W-shaped radio wave absorbers that absorb a wide range of frequencies are designed to absorb the characteristics of antennas, etc., like an anechoic chamber. It is used as a structural material to create an anechoic space by blocking radio waves from outside to investigate Furthermore, N-type radio wave absorbers that absorb only specific frequencies are used to prevent the reflection of TV radio waves from buildings, and both have a wide range of uses.
これらの電波吸収体は、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体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 absorbers 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. As an absorber, carbon is mixed into a molded base material, and as a material that causes dielectric loss, a powder such as ferrite is mixed into a molded base material.
ところが、これらの電波吸収体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２電磁波
は、その電波吸収体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、吸収体の厚さｄ
は、電磁波の波長λとの関係を有し、従来はｄ／λ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０例えば、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λ／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
ｍもの厚さが必要となる。However, these radio wave absorbers 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, and in the conventional configuration, two electromagnetic waves are In the process of passing through the inside of the radio wave absorber, it is converted into thermal energy and consumed, and the thickness of the absorber d
has a relationship with the wavelength λ of electromagnetic waves, and conventionally, d/λ has been used as a figure of merit, and in order to achieve a certain performance, it has been thought that the thickness d needs to be considerably thick.For example, In a configuration in which a resistive film such as a carbon sheet is provided on the surface of a lossless material, a thickness of λ/4 is theoretically required, and the frequency f
= 75c when applying 100MHz electromagnetic waves
A thickness of m is required.
本発明は、効率の良い電波吸収体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 an efficient radio wave absorber.
〈課題を解決するための手段〉
本願の第一の発明は、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ｙが形成されてなる粗球Ｘを成
形基材内に分散させたことを特徴とする電波吸収体であ
る。<Means for Solving the Problems> The first invention of the present application is that rough spheres X each having an electromagnetic absorption layer y formed of an oxide magnetic material such as ferrite on the surface thereof are dispersed in a molded base material. It is a radio wave absorber characterized by:
また、第二の発明は、この粗球Ｘを軽量とするための製
造方法であって、牛骨粉、セルロース等の粒状担持体の
表面に酸化物磁性材料からなる被膜を形成し、これを加
熱して焼成することにより軽量粒球Ｘを形成し、該軽量
粒球Ｘを成形基材内に分散させたことを特徴とするもの
である。The second invention is a manufacturing method for making the rough spheres X lightweight, which involves forming a film made of an oxide magnetic material on the surface of a granular carrier such as beef bone powder or cellulose, and heating the film. It is characterized in that lightweight granules X are formed by firing and then dispersed within a molded base material.
く作用〉
吸収材内に入射した電磁波は、第１図に示すように、そ
の入射角が球面に対して所定以上であるもの（α、β）
は、粗球Ｘに入射する。または、粗球Ｘ表面で反射した
もの（γ）も、その反射波は、吸収材内で他の粗球Ｘに
衝突し、結局いづれかの粗球Ｘ内に入射することとなる
。そして粗球Ｘに入射した電磁波（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し、
電磁吸収層ｙに再入射する等し、結局同様に減衰するこ
ととなる。As shown in Figure 1, the electromagnetic waves that have entered the absorbing material have an angle of incidence greater than a predetermined angle with respect to the spherical surface (α, β).
is incident on the coarse sphere X. Alternatively, the reflected wave (γ) reflected from the surface of the rough sphere X collides with other rough spheres X within the absorbing material, and eventually enters into one of the rough spheres X. Due to the angle of incidence, the electromagnetic wave (α) incident on the rough sphere It arises, decays, 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,
The light re-enters the electromagnetic absorption layer y, and ends up being attenuated in the same way.
また、各粗球Ｘとの衝突と、その反射を繰り返すことに
より、電磁波の走行路が長くなる。この走行路は結局、
従来構成の吸収体の厚さｄに相当することとなるから、
吸収体を厚くせずとも、十分な吸収能を達成できること
とを意味する。Moreover, by repeating collision with each coarse ball X and its reflection, the travel path of the electromagnetic wave becomes longer. In the end, this route
Since it corresponds to the thickness d of the absorber of the conventional structure,
This means that sufficient absorption capacity can be achieved without increasing the thickness of the absorbent body.
さらにまた、前記粗球Ｘを製造するにあたって、牛骨粉
、セルロース等の粒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すると、粒状
相持体の脱水、炭化等により、内層Ｚが球状となり、該
粗球Ｘの重量の軽減化を図ることができる。このため、
該粗球を含有する吸収体の軽量化が達成される。Furthermore, in producing the coarse spheres X, a film made of an oxide magnetic material is formed on the surface of a granular carrier such as bovine bone powder or cellulose, and when this is heated and fired, the granular carrier is dehydrated and carbonized. As a result, the inner layer Z becomes spherical, and the weight of the coarse spheres X can be reduced. For this reason,
The weight of the absorbent body containing the coarse spheres can be reduced.
〈実施例〉 第２図について本発明の一実施例を説明する。<Example> An embodiment of the invention will be described with reference to FIG.
本発明に係る電波吸収体ｌは、成形基材２内に、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
面に形成された直径３ｍｍ〜２５ａ＋ｍの粗球Ｘを分散
させてなるものである。The radio wave absorber l according to the present invention has rough spheres X having a diameter of 3 mm to 25 a+m on whose surface an electromagnetic absorption layer y made of an oxide magnetic material already shown in FIG. 1 is dispersed in a molded base material 2. It is something that can be done.
前記粗球Ｘの製造方法の一例を第３図に従って説明する
。An example of a method for manufacturing the coarse spheres X will be explained with reference to FIG. 3.
まず牛骨粉、セルロース等を糊、水等で練って粒状担持
体３を成形する（イ）。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４を貯留した槽５（ロ）
内に粒状担持体３を漬け、該粒状担持体３の表面に均一
に材料４を塗着形成する（ハ）、これを、炉６内で加熱
して、該担持体３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、而して粗球
Ｘが製造される（二）。First, beef bone powder, cellulose, etc. are kneaded with glue, water, etc. to form a granular carrier 3 (a). Next, a tank 5 (b) stores material 4 made by mixing ferrite powder with a binder to make it viscous.
The granular carrier 3 is soaked in the granular carrier 3, and the material 4 is uniformly coated on the surface of the granular carrier 3 (c). This is heated in the furnace 6 to bake the carrier 3 and dehydrate it. Carbonized and material 4
The binder inside is burnt off to form a sintered ferrite layer (electromagnetic absorption layer y made of oxide magnetic material), thus producing coarse spheres X (2).
かかる構成の粗球Ｘにあっては、内層２は相持体３の材
質により、前記焼成により内空状となるか、または空隙
率の高い球状となって、その軽量化が実現できる。In the coarse spheres X having such a structure, the inner layer 2 becomes hollow or has a spherical shape with high porosity due to the firing, depending on the material of the supporting body 3, so that its weight can be reduced.
尚、内層２は内実状としても良（、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。The inner layer 2 may be formed as a solid material (in this case, the inner layer 2 may be made of a supporting material mixed with carbon or ferrite powder having radio wave absorbing ability).
この粗球Ｘを、砂利、砂、及び有機バインダーからなる
成形基材２内に分散混合し、板状等に成形し、その乾燥
凝固によって電波吸収体ｌが形成される。The coarse spheres X are dispersed and mixed in a molding base material 2 made of gravel, sand, and an organic binder, molded into a plate shape, etc., and the radio wave absorber 1 is formed by drying and coagulating.
かかる構成にあって、電波吸収体１に入射した電磁波は
、各粗球Ｘに入射し、酸化物磁性材料層からなる電磁吸
収層ｙ内で反射を繰り返して、層内に閉じ込められなが
ら、誘電損を生じて減衰消失するか、該材料層を透過し
て、内層Ｚ内で反射を繰り返し、表層の電磁吸収層ｙ内
に再入射する等の経路を経て、結局同様に消失すること
となる。With such a configuration, the electromagnetic waves incident on the radio wave absorber 1 are incident on each coarse sphere X, are repeatedly reflected within the electromagnetic absorption layer y made of an oxide magnetic material layer, and are confined within the layer while dielectric Either it causes loss and attenuates and disappears, or it passes through the material layer, is repeatedly reflected within the inner layer Z, and re-enters the surface electromagnetic absorption layer y, and eventually disappears in the same way. .
また電波吸収体１の裏面には第２図のように、鉄板、銅
板または導電性ゴムシート等の導電板ｌＯを裏打ちする
ことにより、電磁シールドがなされ得る。Further, as shown in FIG. 2, the back surface of the radio wave absorber 1 can be provided with an electromagnetic shield by lining it with a conductive plate lO such as an iron plate, a copper plate, or a conductive rubber sheet.
前記成形基材２としては、合成樹脂材料、天然ゴム、合
成ゴム等も用いられ得る。As the molded base material 2, synthetic resin materials, natural rubber, synthetic rubber, etc. may also be used.
前記粗球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体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、２Ｇ１１ｚ〜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、
次記する粗球Ｘの粒径の選定と共に、用途に応じた特性
を達成し得ることとなる。The rough spheres X may be constructed by forming an electromagnetic absorber y made of rubber ferrite on the surface of a supporting material that becomes the inner layer Z. Unlike sintered ferrite, rubber ferrite is known to have the ability to absorb electromagnetic waves in the frequency band of 2G11z to 5GHz, and by selecting this material,
By selecting the particle size of the coarse spheres X as described below, it is possible to achieve characteristics according to the intended use.
前記粗球Ｘの直径により、吸収可能な電磁波の周波数が
変化することが認められる。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（Ｗ形電波吸収体）を形成する場合には
、種々の径の粗球Ｘを成形基材２内に混合分散させれば
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形電波吸収体）を形成する場合には、所定の径
の粗球Ｘのみを混合分散させれば良い。すなわち１粒球
Ｘの径を選定することにより、適用可能な周波数帯域幅
を設定することができ、Ｗ形電波吸収体、Ｎ形電波吸収
体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。It is recognized that the frequency of electromagnetic waves that can be absorbed changes depending on the diameter of the rough sphere X. Therefore, when forming something that absorbs a wide range of frequencies (W-shaped radio wave absorber) for use as a material for radio anechoic chambers, radio wave stations, etc., coarse spheres X of various diameters are placed on the molded base material 2 Also, when forming something used to absorb only a specific frequency (N-type radio wave absorber), it is sufficient to mix and disperse only the coarse spheres X with a predetermined diameter. good. In other words, by selecting the diameter of a single sphere Accordingly, the corresponding characteristics can be easily generated.
また前記構成にあって、成形基材２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, in the above structure, if powders such as carbon or ferrite are mixed as a component of the molding base material 2, the radio waves will collide with each powder, causing dielectric loss or dielectric loss, and the attenuation will be made more efficient. It will be done.
〈発明の効果〉
本発明は、上述の様に、成形基材２内に、電磁吸収層ｙ
が表層に形成された粗球Ｘを分散して。<Effects of the Invention> As described above, the present invention provides an electromagnetic absorption layer y in the molded base material 2.
disperses the coarse spheres X formed on the surface layer.
電波吸収体ｌを構成したものであるから、電磁波は、粗
球Ｘ内に入射し、その電磁吸収層ｙ内で、反射を繰り返
して減衰するとともに、その行路を長くすることができ
る。このため、電磁波の吸収能が飛躍的に向上し、電波
吸収体１の薄厚化を実現できる。また粗球Ｘの径を選定
したり、または複数の径の粗球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。Since the radio wave absorber 1 is configured, the electromagnetic wave enters the coarse sphere X, is repeatedly reflected within the electromagnetic absorption layer y, and is attenuated, and its path can be lengthened. Therefore, the ability to absorb electromagnetic waves is dramatically improved, and the thickness of the radio wave absorber 1 can be reduced. In addition, by selecting the diameter of the rough spheres X or mixing coarse spheres The fields of its use will expand, such as preventing reception interference due to
また、粒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粗球は軽量となり、
前記粗球を備えた吸収体にあって、その軽量化を図るこ
とができる６
等の優れた効果がある。In addition, by forming a coating made of oxide magnetic material on the surface of the granular carrier and heating and firing it, the coarse spheres become lightweight.
The absorbent body equipped with the coarse spheres has the following excellent effects, such as being able to reduce its weight.
添付図面は本発明の実施例を示し、第１図は粗球Ｘの作
用を示す説明図、第２図は電波吸収体の一例を示す縦断
側面図、第３図は軽量粒球Ｘの製造工程を示す説明図で
ある。
ｌ・・・電波液吸収体
２・・・成形基材
３・・・粒状担持体
ｌＯ・・・導電板
Ｘ・・・粗球 ｙ・・・電磁吸収層 Ｚ−・・内層葛１
８
富２０
昂３０
↓
手続補正書
昭和６３年９月１９日
２、発明の名称
電波吸収体及び、その製造方法
３、補正をする者
事件との関係 出願人
住所 名古屋市瑞穂区関取町４番地
氏名 野 １） 健 −
４、代理人 〒４６０
住所 名古屋市中区千代田３丁目１１番１１号ノ
ロ、補正の対象 明細書
７、補正の内容
明細書第７頁第１Ｏ行と第１１行との間に次の文「 ま
た成形基材２としては１発泡ウレタン樹脂等の発泡プラ
スチック材料を用いても良い。
この材料にあっては、電波吸収体ｌの軽量化を実現でき
ると共に、前記導電板１０を一方の型板に代用して成形
することにより、接着剤を要することなく該導電板１０
との接合が可能となる利点がある。」
以上The attached drawings show embodiments of the present invention; FIG. 1 is an explanatory diagram showing the action of the coarse spheres X, FIG. 2 is a vertical side view showing an example of a radio wave absorber, and FIG. It is an explanatory diagram showing a process. l... Radio wave liquid absorber 2... Molded base material 3... Granular support lO... Conductive plate X... Rough sphere y... Electromagnetic absorption layer Z-... Inner layer kudzu 1
8 Tomi 20 Kou 30 ↓ Procedural amendment September 19, 1988 2. Name of the invention: Radio wave absorber and its manufacturing method 3. Person making the amendment Relationship with the case Applicant address: 4, Sekitori-cho, Mizuho-ku, Nagoya City Name No 1) Ken - 4, Agent 460 Address Noro 3-11-11 Chiyoda, Naka-ku, Nagoya Subject of amendment Specification 7, Contents of amendment Page 7 Lines 1O and 11 In between, there is the following sentence: "Also, a foamed plastic material such as foamed urethane resin may be used as the molding base material 2. With this material, the weight of the radio wave absorber l can be reduced, and the conductive plate By molding the conductive plate 10 by replacing it with one of the templates, the conductive plate 10 can be formed without using an adhesive.
This has the advantage that it can be bonded to "that's all
Claims (1)
れてなる粒球を成形基材内に分散させたことを特徴とす
る電波吸収体。 ２）粒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することにより軽量粒球を
形成し、該軽量粒球を成形基材内に分散させたことを特
徴とする電波吸収体の製造方法。[Scope of Claims] 1) A radio wave absorber characterized in that particles having an electromagnetic absorption layer made of an oxide magnetic material formed on the surface thereof are dispersed in a molded base material. 2) A film made of an oxide magnetic material is formed on the surface of a granular support, and this is heated and fired to form lightweight granules, and the lightweight granules are dispersed within a molding base material. A method for producing a characteristic radio wave absorber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63047204A JP2618674B2 (en) | 1988-02-29 | 1988-02-29 | Manufacturing method of radio wave absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63047204A JP2618674B2 (en) | 1988-02-29 | 1988-02-29 | Manufacturing method of radio wave absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01220899A true JPH01220899A (en) | 1989-09-04 |
| JP2618674B2 JP2618674B2 (en) | 1997-06-11 |
Family
ID=12768613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63047204A Expired - Fee Related JP2618674B2 (en) | 1988-02-29 | 1988-02-29 | Manufacturing method of radio wave absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2618674B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03165599A (en) * | 1989-11-24 | 1991-07-17 | Kenichi Noda | Radio wave absorbent material, manufacture thereof, and radio wave absorbing board formed thereof |
| EP0479438A2 (en) * | 1990-10-02 | 1992-04-08 | Minnesota Mining And Manufacturing Company | Electromagnetic radiation absorbing material employing doubly layered particles |
| US5389434A (en) * | 1990-10-02 | 1995-02-14 | Minnesota Mining And Manufacturing Company | Electromagnetic radiation absorbing material employing doubly layered particles |
| JP2007036081A (en) * | 2005-07-29 | 2007-02-08 | Ritsuken Gen | Microwave-absorbing film structure and its manufacturing method |
| JP2007142369A (en) * | 2005-10-17 | 2007-06-07 | Noc:Kk | Electromagnetic wave absorbing material and electromagnetic wave absorbing powder |
| US8138959B2 (en) * | 2006-10-19 | 2012-03-20 | Hitachi Metals, Ltd. | Radio wave absorption material and radio wave absorber |
| CN103785362A (en) * | 2014-02-13 | 2014-05-14 | 中国科学院化学研究所 | Magnetic porous cellulose sphere adsorbent and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49121999A (en) * | 1973-04-02 | 1974-11-21 | ||
| JPS60130698U (en) * | 1984-02-13 | 1985-09-02 | 塚本 健吉 | Ferra for radio wave absorbing material |
-
1988
- 1988-02-29 JP JP63047204A patent/JP2618674B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49121999A (en) * | 1973-04-02 | 1974-11-21 | ||
| JPS60130698U (en) * | 1984-02-13 | 1985-09-02 | 塚本 健吉 | Ferra for radio wave absorbing material |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03165599A (en) * | 1989-11-24 | 1991-07-17 | Kenichi Noda | Radio wave absorbent material, manufacture thereof, and radio wave absorbing board formed thereof |
| EP0479438A2 (en) * | 1990-10-02 | 1992-04-08 | Minnesota Mining And Manufacturing Company | Electromagnetic radiation absorbing material employing doubly layered particles |
| US5389434A (en) * | 1990-10-02 | 1995-02-14 | Minnesota Mining And Manufacturing Company | Electromagnetic radiation absorbing material employing doubly layered particles |
| JP2007036081A (en) * | 2005-07-29 | 2007-02-08 | Ritsuken Gen | Microwave-absorbing film structure and its manufacturing method |
| JP2007142369A (en) * | 2005-10-17 | 2007-06-07 | Noc:Kk | Electromagnetic wave absorbing material and electromagnetic wave absorbing powder |
| JP4620645B2 (en) * | 2005-10-17 | 2011-01-26 | 株式会社 エヌ・オー・シー | Manufacturing method of electromagnetic wave absorber |
| US8138959B2 (en) * | 2006-10-19 | 2012-03-20 | Hitachi Metals, Ltd. | Radio wave absorption material and radio wave absorber |
| CN103785362A (en) * | 2014-02-13 | 2014-05-14 | 中国科学院化学研究所 | Magnetic porous cellulose sphere adsorbent and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2618674B2 (en) | 1997-06-11 |
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