JPH01305503A - Radio wave absorbing material - Google Patents
Radio wave absorbing materialInfo
- Publication number
- JPH01305503A JPH01305503A JP63136494A JP13649488A JPH01305503A JP H01305503 A JPH01305503 A JP H01305503A JP 63136494 A JP63136494 A JP 63136494A JP 13649488 A JP13649488 A JP 13649488A JP H01305503 A JPH01305503 A JP H01305503A
- Authority
- JP
- Japan
- Prior art keywords
- radio wave
- absorbing material
- wave absorbing
- sintered ferrite
- plate
- 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
- 239000011358 absorbing material Substances 0.000 title claims abstract description 13
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 abstract description 10
- 229910018605 Ni—Zn Inorganic materials 0.000 abstract description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 15
- 239000006096 absorbing agent Substances 0.000 description 9
- 239000000843 powder Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229920006248 expandable polystyrene Polymers 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 244000144992 flock Species 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- -1 was used Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910019086 Mg-Cu Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920006328 Styrofoam Polymers 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000008261 styrofoam Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
利用産業分野
この発明は、単層の電波吸収体として用いる焼結フェラ
イトに係り、特定組成でかつ高密度のＮｉ−Ｚｎ系焼結
フェライトとすることにより、例えば、４〜６ｍｍの薄
板であっても、広帯域でかつ極めて高い電波吸収能力を
発揮する電波吸収材料に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Application This invention relates to sintered ferrite used as a single-layer radio wave absorber. The present invention relates to a radio wave absorbing material that exhibits a wide band and extremely high radio wave absorption ability even when it is a thin plate of ~6 mm.
背景技術
通信技術、航空機等の電波誘導技術の発達、あるいはＴ
Ｖや各種電気機器等の普及に伴ない、各種電気、電子機
器のノイズフィルター用、制御装置等の誤動作の防止用
、電波反則防止用、電波吸収壁用、さらに電波暗室用等
に、各周波数帯域に整合しノ、：電波吸収体が求められ
、種々の材料が提案されている。Background technologyThe development of communication technology, radio wave guidance technology for aircraft, etc.
With the spread of V and various electrical equipment, various frequencies are being used for noise filters in various electrical and electronic equipment, for preventing malfunction of control devices, for preventing radio wave fouling, for radio wave absorption walls, and for radio anechoic chambers. There is a need for a radio wave absorber that matches the band, and various materials have been proposed.
従来は、導電性を利用する金属板や薄膜、カーボン等を
、ゴムやプラスチックス等で保持したものが一般的であ
った。Conventionally, it has been common to use conductive metal plates, thin films, carbon, etc., held together by rubber, plastic, or the like.
まノこ、磁気的吸収体として知られたカーボニル鉄を用
いたたり、さらにゴム等に複合したものや、誘電体損失
を利用した発泡スチロール等が知られていた。Manoko, carbonyl iron, which is known as a magnetic absorber, was used, and materials composited with rubber, etc., and foamed polystyrene using dielectric loss were also known.
さらに、Ｎｉ−Ｚｎ系、Ｍｎ、−Ｍｇ−Ｃｕ系等のフェ
ライト粉末をゴム系やシリコン、エポキシ等の高分子化
合物と複合して磁気的吸収体、あるいは電気磁気的吸収
体となした複合利旧、アルミ等の金属箔片を混入したプ
ラスチックス材木１、導電性繊維を用いたもの等が提案
されている。Furthermore, we have developed composite materials in which ferrite powders such as Ni-Zn, Mn, and -Mg-Cu are combined with rubber, silicon, and polymeric compounds such as epoxy to form magnetic absorbers or electromagnetic absorbers. In the past, plastic lumber mixed with pieces of metal foil such as aluminum, and materials using conductive fibers have been proposed.
近年では、磁気共鳴現象を利用した焼結フ、１ライト、
ずなわち、Ｍｎ−Ｍｇ系焼結フエライ［・からなる板に
金属板裏張りを施した構成とすることにより、電波吸収
能力にすぐれ、かつ比較的薄板として利用できるため、
実用化が進んでいる。In recent years, sintered fibers, 1 light, and
In other words, by constructing a plate made of Mn-Mg-based sintered ferrite with a metal plate lining, it has excellent radio wave absorption ability and can be used as a relatively thin plate.
Practical implementation is progressing.
ま／こ、前記の各種（わ」の釦み合わせ、積層した複合
月利も提案されている。Various combinations of the above-mentioned (wa) buttons and laminated compound monthly interest rates have also been proposed.
従来技術の問題点
従来の電波吸収月利は、固有の整合周波数帯域があり、
例えば、各種の実、験や／Ｉ！！Ｉ定に用いる電波暗室
は、室内で発生させた電波を壁で反則させないこと、外
部からの電波を遮断できることが要求され、広帯域にお
ける電波吸収能力にすぐれた月１Ｎが求められるため、
ｉ、ｆ来は、ピラミッド型等の発泡スチロール表面にカ
ーホンを塗布した構成が利用されていた。Problems with conventional technology Conventional radio wave absorption monthly rate has a unique matching frequency band.
For example, various fruits, experiments, /I! ! The anechoic chamber used for I-determination is required to be able to prevent radio waves generated indoors from being reflected by walls and to be able to block radio waves from outside, and is required to be 1N with excellent radio wave absorption ability in a wide band.
In the past, a structure in which carphone was applied to the surface of pyramid-shaped Styrofoam was used.
しかし、ｔ；ｆ＝來の電波吸収月利では、電波暗室に要
求される電波反則減衰量を得るには、数百ｍｍの厚みを
要するため、施工、設置が制限される問題があった。However, when t; f = the current radio wave absorption rate, a thickness of several hundred mm is required to obtain the amount of radio wave foul attenuation required for an anechoic chamber, which poses a problem that limits construction and installation.
前記焼結フェライトを電波暗室の電波吸収体として用い
るには、電波吸収能力が不足するため、例えば、ＶＨＦ
帯域で１０〜１５ｄＢの吸収、減衰量を得るのに厚みを
十数化以上に増大させるか、発泡スチロールと積層、複
合して用いる必要があり、前者は重量増加が問題となり
、後者はやはり厚みが問題であった。To use the sintered ferrite as a radio wave absorber in an anechoic chamber, the radio wave absorption ability is insufficient, so for example, VHF
In order to obtain absorption and attenuation of 10 to 15 dB in the band, it is necessary to increase the thickness to more than a decimal point, or to use it in combination with foamed polystyrene, and the former poses a problem of increased weight, while the latter requires increased thickness. That was a problem.
また、各種の制御機器や電子機器に用いられるデバイス
には、不要信号となる高周波ノイズを遮断するために電
波吸収体の付設が不可欠となっているが、今日の機器の
小型高性能化の要請に伴ない、製造性、加工性がよく、
薄く小型化可能で電波吸収、減衰量の大きな電波吸収体
が強く求められている。Additionally, devices used in various control equipment and electronic equipment must be equipped with radio wave absorbers to block high-frequency noise that becomes unnecessary signals, but today's equipment is required to be smaller and more sophisticated. Along with this, it has good manufacturability and processability,
There is a strong demand for a radio wave absorber that can be made thin and compact and has a large amount of radio wave absorption and attenuation.
発明の目的
この発明は、かかる現状に鑑み、比較的広帯域でかつ高
い反射減衰量を有し、薄板化や小片化が可能で、製造量
産性にすぐれ、電波暗室用や電子デバイス用に最適な電
波吸収Ｈ料を目的としてい発明の概要
この発明は、広帯域でかつ高い反射減衰量を有する、す
なわち、薄板化や小片化としての利用が可能な電波吸収
材料を目的として、特に焼結フェライトの組成について
種々検削した結果、特定組成でかつ高密度のＮｉ−Ｚｎ
系焼結フェライトとすることにより、僅か４〜６ｍｍの
薄板で、３０〜３００ＭＨｚ帯域における反則減衰量が
２０ｄＢ以上の特性が得られることを知見し、この発明
を完成したものである。Purpose of the Invention In view of the current situation, this invention has a relatively wide band and high return loss, can be made into thin plates and small pieces, has excellent mass productivity, and is ideal for use in anechoic chambers and electronic devices. SUMMARY OF THE INVENTION The present invention aims at a radio wave absorbing material that has a wide band and high return loss, that is, can be used as a thin plate or into small pieces. As a result of various examinations regarding the composition, Ni-Zn with a specific composition and high density was found.
The present invention was completed based on the finding that by using sintered ferrite, a characteristic of 20 dB or more of foul attenuation in the 30 to 300 MHz band can be obtained with a thin plate of only 4 to 6 mm.
すなわち、この発明は、
Ｆｅ２Ｏ３６４，８０〜６６．８０ｗｔ％Ｎｉ０ ７．
００−１２．４５ｗｔ％
ＺｎＯ２０，６０−２３，００ｗｔ％
主成分とし、
あるいはさらに、前記ＮｉＯの置換成分としてＣｕＯを
５．６ｗｔ％以下含有し、
密度が５．０ｇ／ｃｍ３以上の焼結フェライトであるこ
とを特徴とする電波吸収材料であり、
また、Ａわ′−１厚さ４〜６ｍｍの板状あるいは管状体
で、３０〜３００ＭＨｚ帯域における反則減衰量が２０
ｄＢ以上であることを４）徴とする電波吸収材料である
。That is, this invention provides Fe2O364,80-66.80wt%Ni07.
00-12.45wt% ZnO20,60-23,00wt% as a main component, or further containing CuO as a substituent component of NiO at 5.6wt% or less, and a sintered ferrite with a density of 5.0g/cm3 or more. It is a radio wave absorbing material characterized by the fact that it is a plate-like or tubular body with a thickness of 4 to 6 mm, and has a foul attenuation of 20 in the 30 to 300 MHz band.
It is a radio wave absorbing material whose characteristic is 4) that it is dB or more.
発明の構成
ａ成
この発明による電波吸収材料は、Ｆｅ２Ｏ３、Ｎｉ０１
ＺｎＯを主成分とし、各成分が、Ｆｅ２Ｏ３６４，８０
−６６，８０ｗｔ％ＮｉＯ７，００−１，２，４５ｗｔ
％
ＺｎＯ ２０．６０−２３．００ｗｔ％の範囲以外では
、６ｍｍ以下の薄板で、３０〜３００ＭＩ−Ｉｚ帯域に
おりる反射減衰量が２０ｄＢ以上の特性を得ることがで
きない。Structure of the Invention (a) The radio wave absorbing material according to the present invention includes Fe2O3, Ni01
The main component is ZnO, and each component is Fe2O364,80
-66,80wt%NiO7,00-1,2,45wt
%ZnO outside the range of 20.60-23.00 wt%, a thin plate of 6 mm or less cannot obtain characteristics with a return loss of 20 dB or more in the 30-300 MI-Iz band.
ずなわぢ、３成分系において、いずれの１成分でも」二
記の範囲外どなると、電波吸収に必要な磁気損失が小さ
くなり、薄板で目的の帯域におりる反射）減衰量が薄セ
ｉで得られなくなる。In a three-component system, if any one component falls outside the range specified in 2, the magnetic loss required for radio wave absorption becomes small, and the amount of reflection (reflection that falls into the target band with a thin plate) becomes thinner. You won't be able to get it.
また、この発明による電波吸収オ旧」においてＣｕＯは
、ＮｉＯ成分の一部として置換するもので、前記３成分
系と同様の目的帯域での反射減衰量がＩＹＨられる。置
換量が５．６ｗｔ％を越えると、異常粒成長が生じ磁気
特性が劣化するため、５．６ｗｔ％以下を含有し、好ま
しくは３．０〜５．０ｗｔ％である。Furthermore, in the radio wave absorbing device according to the present invention, CuO is substituted as part of the NiO component, and the return loss in the target band similar to that of the three-component system is IYH. If the amount of substitution exceeds 5.6 wt%, abnormal grain growth occurs and magnetic properties deteriorate, so the content is 5.6 wt% or less, preferably 3.0 to 5.0 wt%.
この発明による電波吸収材料は、前記の主成分のほか、
製造上で不可避な不純物の含有を許容できるが、さらに
、積極的に以下の元素を添加含有することができる。The radio wave absorbing material according to the present invention contains, in addition to the above-mentioned main components,
Although the inclusion of impurities that are unavoidable during manufacturing is acceptable, the following elements can be actively added.
ＺｒＯ２は、焼結性向上のために添加するが、０．１ｗ
ｔ、％を越えると、磁気特性が劣化して目的の反射減衰
量が薄板で得られなくなるため、０．１ｗｔ％以下３”
Ａすることができ、好ましくは、０、（１５ｗｔ％−０
，１−ｗｔ％である。ZrO2 is added to improve sinterability, but 0.1w
If it exceeds 0.1wt%, the magnetic properties will deteriorate and the desired return loss cannot be obtained with a thin plate.
A, preferably 0, (15wt%-0
, 1-wt%.
ＣａＯは、異常粒成長抑制のために添加するが、０．３
ｗｔ％を越えると、磁気特性が劣化して目的の反ね：］
減衰量が薄板で得られなくなるため、０．３ｗｔ％以下
含有することができ、好ましくは、
０．２ｗｔ％−０，３ｗｔ％である。CaO is added to suppress abnormal grain growth, but 0.3
If it exceeds wt%, the magnetic properties will deteriorate and will defeat the purpose.
Since the amount of attenuation cannot be obtained with a thin plate, the content can be 0.3 wt% or less, and preferably 0.2 wt% - 0.3 wt%.
ＳｉＯは、高周波数領域におｌｊる磁気特性のために向
上のために添加するが、０．３ｗｔ％を越えると、異常
粒成長が生じ磁気特性が劣化するため０．３ｗｔ％以下
含有することができ、好ましくは、０．１５ｗｔ％−０
，３ｗｔ％である。SiO is added to improve the magnetic properties in the high frequency range, but if it exceeds 0.3 wt%, abnormal grain growth will occur and the magnetic properties will deteriorate, so the content should be 0.3 wt% or less. and preferably 0.15wt%-0
, 3wt%.
Ｃｏｏは、目的の周波数領域（バンド幅）を得るために
、０．３ｗｔ％以下含有することができ、好ましくは、
０．１５ｗｔ％〜０．３ｗｔ％である。Coo can be contained at 0.3 wt% or less in order to obtain the desired frequency range (bandwidth), and preferably,
It is 0.15wt% to 0.3wt%.
性状・組織
この発明によるＮｉ−Ｚｎ系焼結フェライトは、組成的
には、
（ＮｉＯ）ｘ−（ＺｎＯ）ｙ・（ＣｕＯ）ｚ−Ｆｅ２０
３、（ｘ ＋ ｙ ＋ ｚ≦１）の一般式で示され、そ
の結晶構造はスピネル型である。Properties/Structure The Ni-Zn sintered ferrite according to the present invention has the following composition: (NiO)x-(ZnO)y/(CuO)z-Fe20
3. It is represented by the general formula (x + y + z≦1), and its crystal structure is spinel type.
また、この発明によるＮｉ−Ｚｎ系焼結フェライトは、
すぐれた特性を得るには、少なくとも５．０ｇ／ｃｍ３
の密度が必要である。好ましくは５．０ｇ／ｃｍ３〜５
．３ｇ／ｃｍ３である。Furthermore, the Ni-Zn sintered ferrite according to the present invention is
At least 5.0 g/cm3 for excellent properties
density is required. Preferably 5.0g/cm3-5
．． It is 3g/cm3.
この発明において、得られる反射減衰量は、組成の違い
や製造過程の違いによる差より、材料厚み等の寸法、形
状の違いによる差が大きく、組成の違い、要求される周
波数帯域及び反則減衰量に応じて、適宜選定するとよい
。In this invention, the obtained return loss has a larger difference due to differences in dimensions such as material thickness and shape than differences due to differences in composition or manufacturing process. It is advisable to select as appropriate depending on the situation.
例えば、この発明によるＮｉ−Ｚｎ系焼結フェライトを
、タイル状で用いる場合、組成が、Ｆｅ２Ｏ３６６，６
０−６６，８０ｗｔ％、Ｎｉ０１０．９０−１１．１０
ｗｔ％、ＺｎＯ２０，６０−２２，４０ｗｔ％
あるいは、
Ｆｅ２Ｏ３６４，８０−６５，２０ｗｔ％、ＮｉＯ９，
３０−９，７ｗｔ％、ＣｕＯ４，５０−４，９ｗｔ％、
ＺｎＯ２０，６０−２１，０ｗｔ％のものを、
厚み４〜６ｍｍで、任意の形状寸法に成型し、焼結まま
、裏張り金属板にＣｕ板あるいはＡｌ板を用い、これを
所要の位置に敷設あるいは貼着する。For example, when using the Ni-Zn-based sintered ferrite according to the present invention in the form of tiles, the composition is Fe2O366,6
0-66,80wt%, Ni010.90-11.10
wt%, ZnO20,60-22,40wt% or Fe2O364,80-65,20wt%, NiO9,
30-9,7wt%, CuO4,50-4,9wt%,
ZnO of 20.60-21.0wt% is molded into any shape and size with a thickness of 4 to 6 mm, and while sintered, a Cu plate or Al plate is used as the backing metal plate, and this is laid at the required position. Or stick it on.
また、この発明によるＮｉ−Ｚｎ系焼結フェライトを、
管状で用いる場合、例えば、電磁波を発生ずるコード等
を包囲するため、前記組成のものを、厚み４〜６ｍｍで
、任意寸法の管状に成型し、焼結まま、裏張り金属板に
Ｃｕ板あるいはＡｌ板を用いて使用できる。Moreover, the Ni-Zn based sintered ferrite according to the present invention,
When used in a tubular form, for example, in order to surround a cord that generates electromagnetic waves, the above composition is formed into a tubular shape of arbitrary size with a thickness of 4 to 6 mm, and while sintered, a Cu plate or a metal backing plate is formed. Can be used with an Al plate.
製造法
この発明による電波吸収材料であるＮ１−Ｚｎ系焼結フ
ェライトは、
純度９９．２ｗｔ％以上、平均粒度０．６ｐｍのＦｅ２
Ｏ３純度９９．５ｗｔ％以上、平均粒度１．６ｐｍのＺ
ｎＯ純度９８．５ｗｔ％以上、平均粒度０．６ｐｍ ＆
）ＮｉＯ純度９９．２ｗｔ％以上、平均粒度０．８ｐｍ
のＣｕＯの原料粉末を目的組成となるように配合し、十
分に混合した後、混合粉を、９００°Ｃ１３時間、大気
中で仮焼する。Manufacturing method The N1-Zn sintered ferrite, which is the radio wave absorbing material according to the present invention, is made of Fe2 with a purity of 99.2 wt% or more and an average particle size of 0.6 pm.
Z with O3 purity of 99.5 wt% or more and average particle size of 1.6 pm
nO purity 98.5wt% or more, average particle size 0.6pm &
) NiO purity 99.2wt% or more, average particle size 0.8pm
After blending CuO raw material powders to have the desired composition and thoroughly mixing them, the mixed powders are calcined at 900° C. for 13 hours in the air.
得られた仮焼粉を、ボールミルにて平均粒度１．０〜１
，６いｍまで湿式粉砕した後、ＰＶＡ等のバインダーを
０，６〜１．０ｗｔ％加え、スプレードライヤーにより
、５０〜１１００ｐの造粒粉を作成した。The obtained calcined powder is milled in a ball mill to an average particle size of 1.0 to 1.
. , 6 mm, 0.6 to 1.0 wt % of a binder such as PVA was added, and a granulated powder of 50 to 1100 p was created using a spray dryer.
この造粒粉を成型装置により、
６００〜１０００ｋｇ／ｃｍ２の圧力で任意形状に成型
する。This granulated powder is molded into an arbitrary shape using a molding device at a pressure of 600 to 1000 kg/cm2.
さらに、成型体を、１１００〜１２００°Ｃ１３時間、
大気中で焼結する。Furthermore, the molded body was heated at 1100 to 1200°C for 13 hours.
Sinter in the atmosphere.
実施例
実施例１
原料粉末を下記組成となるよう配合混合だ後、平均粒度
１ｐｍの成型用粉末となし、（界式成形装置により管状
成型体となした。Examples Example 1 Raw material powders were mixed to have the following composition, and then formed into a molding powder with an average particle size of 1 pm (a tubular molded body was formed using a field molding device).
成型体を、１２３０℃×２時間、大気雰囲気にて焼結し
、外径５０ｍｍＸ内径１３皿の焼結体を得た。The molded body was sintered at 1230° C. for 2 hours in an air atmosphere to obtain a sintered body with an outer diameter of 50 mm and an inner diameter of 13 plates.
さらに焼結体より、厚み５ｍｍのリング状試験片を切出
し、電波吸収特性の測定を行なった。Furthermore, a ring-shaped test piece with a thickness of 5 mm was cut out from the sintered body, and its radio wave absorption characteristics were measured.
電波吸収特性の測定は、第１図に示す如く、同軸管（１
）の−万端をショート板（２）でショートし、該ショー
）・板（２）の前に前記リング」二試験片（４）を挿入
し、装入前後の電波の反則吸収特性をネットワーク・ア
ナライザー（５）にて測定することにより実施した。The radio wave absorption characteristics were measured using a coaxial tube (1
) is shorted with a shorting plate (2), and the ring test piece (4) is inserted in front of the plate (2), and the radio wave foul absorption characteristics before and after insertion are measured by the network. This was carried out by measuring with an analyzer (5).
同軸管（１）は、外径４０ｍｍＸ内径３０ｍｍＸ１５０
皿の円筒体からなり、１３ｍｍφの同月：（３）を４０
ΦＸ３ｍｍのショート板（２）に同軸に立設し、円筒体
内に円柱を挿入しかつショート板（２）で一端が閉塞さ
れるよう同軸配置した構成で、全て鋼製からなる。Coaxial tube (1) is outer diameter 40mm x inner diameter 30mm x 150
It consists of a cylindrical body of a plate and has a diameter of 13 mm: (3) is 40
The short plate (2) with a diameter of 3 mm in diameter is coaxially installed, a cylinder is inserted into a cylindrical body, and one end is closed by the short plate (2), and the structure is made of steel.
比較試験片として、市販のＭｎ−Ｍｇ系焼結フ−ｒ、ラ
イトフロックより、前記寸法の試験片を切出しで測定し
た。As a comparison test piece, a test piece having the above dimensions was cut out from a commercially available Mn-Mg based sintered flock, Light Flock, and measured.
試験結果は、第２図の周波数と減衰特性との関係のグラ
フ（ａＢ−ｍ寺性図）に示す。The test results are shown in the graph of the relationship between frequency and attenuation characteristics (aB-m diagram) in FIG.
本発明焼結フェライト
■Ｆｅ２Ｏ３６６，６８ｗｔ％ ＮｉＯ１０，９８ｗｔ
％ＺｎＯ２２，３４ｗｔ％
■Ｆｅ２Ｏ３６６，６５ｗｔ％ Ｎｉ０ １１．００ｗ
ｔ％ＺｎＯ ２２．３４ｗｔ％ ＺｒＯ２０，１０ｗｔ
％■Ｆｅ２Ｏ３６５，００ｗｔ％ ＮｉＯ９，５２ｗｔ
％ＺｎＯ ２０．８５ｗｔ％ ＣｕＯ４，６３ｗｔ％比
較焼結フェライト
■Ｆｅ２Ｏ３６９，２０ｗｔ％、 ＭｎＯ４，１０ｗ
ｔ％、ＭｇＯ９，６５ｗｔ％、 ＺｎＯ １７．０
０ｗｔ％、ＣａＯＯ，０５ｗｔ％
■Ｆｅ２Ｏ３６５，８０ｗｔ％ ＮｉＯ１１，００ｗｔ
％ＺｎＯ２２，２０ｗｔ％ ＺｒＯ２１，Ｏｗｔ％発明
の効果
この発明によるＮｉ−Ｚｎ系焼結フェライトは、僅か４
〜６ｍＩｎの薄板で、３０〜３００ＭＨｚ帯域における
反射減衰量が２０ｄＢ以上の特性が得られ、また、製造
性、加工性がよく、薄く小型化あるいは任意形状に成形
可能で、電波暗室用や電子デバイス用に最適な電波吸収
、減衰量の大きな電波吸収体が得られる。Sintered ferrite of the present invention ■Fe2O366,68wt% NiO10,98wt
%ZnO22,34wt% ■Fe2O366,65wt% Ni0 11.00w
t%ZnO 22.34wt% ZrO20,10wt
%■Fe2O365,00wt% NiO9,52wt
%ZnO 20.85wt% CuO4, 63wt% Comparative sintered ferrite ■Fe2O369, 20wt%, MnO4, 10w
t%, MgO9,65wt%, ZnO 17.0
0wt%, CaOO, 05wt% ■Fe2O365, 80wt% NiO11,00wt
%ZnO22, 20 wt% ZrO21, Owt% Effect of the invention The Ni-Zn based sintered ferrite according to this invention has only 4
A thin plate of ~6 ml has a return loss of 20 dB or more in the 30-300 MHz band, and is easy to manufacture and process, and can be made thin and compact or molded into any shape, making it suitable for use in anechoic chambers and electronic devices. A radio wave absorber with a large amount of radio wave absorption and attenuation that is optimal for use can be obtained.
第１図は実施例における試料の電波反射吸収特性の測定
装置の説明図である。
第２図は周波数と減衰特性との関係を示すグラフ（ｄＢ
−付キ性図）である。
■・同軸管、２・・・ショート板、３ 円柱、４・試験
片、５・・ネットワーク・アナライザー。FIG. 1 is an explanatory diagram of an apparatus for measuring radio wave reflection/absorption characteristics of a sample in an example. Figure 2 is a graph showing the relationship between frequency and attenuation characteristics (dB
- attached diagram). ■・Coaxial tube, 2・Short plate, 3 Cylinder, 4・Test piece, 5・Network analyzer.
Claims (1)
．００〜１２．４５ｗｔ％ ＺｎＯ２０．６０〜２３．００ｗｔ％ を主成分とし、 密度が５．０ｇ／ｃｍ＾３以上の焼結フェライトである
ことを特徴とする電波吸収材料。 ２ Ｆｅ＿２Ｏ＿３６４．８０〜６６．８０ｗｔ％ＮｉＯ７
．００〜１２．４５ｗｔ％ ＺｎＯ２０．６０〜２３．００ｗｔ％ 主成分とし、 さらに、前記ＮｉＯの置換成分としてＣｕＯを５．６ｗ
ｔ％以下含有し、 密度が５．０ｇ／ｃｍ＾３以上の焼結フェライトである
ことを特徴とする電波吸収材料。 ３ Ｆｅ＿２Ｏ＿３６４．８０〜６６．８０ｗｔ％ＮｉＯ７
．００〜１２．４５ｗｔ％ ＺｎＯ２０．６０〜２３．００ｗｔ％ 主成分とし、 あるいはさらに、前記ＮｉＯの置換成分としてＣｕＯを
５．６ｗｔ％以下含有し、 密度が５．０ｇ／ｃｍ＾３以上、厚さ４〜６ｍｍの板状
あるいは管状体の焼結フェライトからなり、 ３０〜３００ＭＨｚ帯域における反射減衰量が２０ｄＢ
以上であることを特徴とする電波吸収材料。[Claims] 1 Fe_2O_364.80-66.80wt%NiO7
．． A radio wave absorbing material characterized in that it is a sintered ferrite having a density of 5.0 g/cm^3 or more and containing 00 to 12.45 wt% ZnO20.60 to 23.00 wt% as main components. 2 Fe_2O_364.80~66.80wt%NiO7
．． 00 to 12.45 wt% ZnO20.60 to 23.00 wt% as the main component, and 5.6 w of CuO as a replacement component for the NiO.
A radio wave absorbing material characterized by being a sintered ferrite containing t% or less and having a density of 5.0 g/cm^3 or more. 3 Fe_2O_364.80~66.80wt%NiO7
．． 00 to 12.45 wt% ZnO20.60 to 23.00 wt% as a main component, or further contains CuO as a substituent for NiO at 5.6 wt% or less, density is 5.0 g/cm^3 or more, thickness is It is made of sintered ferrite in the form of a plate or tube of 4 to 6 mm, and has a return loss of 20 dB in the 30 to 300 MHz band.
A radio wave absorbing material characterized by the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63136494A JP2794293B2 (en) | 1988-06-02 | 1988-06-02 | Radio wave absorption material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63136494A JP2794293B2 (en) | 1988-06-02 | 1988-06-02 | Radio wave absorption material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01305503A true JPH01305503A (en) | 1989-12-08 |
| JP2794293B2 JP2794293B2 (en) | 1998-09-03 |
Family
ID=15176474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63136494A Expired - Lifetime JP2794293B2 (en) | 1988-06-02 | 1988-06-02 | Radio wave absorption material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2794293B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05206728A (en) * | 1991-08-13 | 1993-08-13 | Korea Advanced Inst Of Sci Technol | Ferrite-based wave absorber |
| JPH05259732A (en) * | 1991-08-13 | 1993-10-08 | Korea Advanced Inst Of Sci Technol | Manufacture of radio wave absorber |
| JP2009200436A (en) * | 2008-02-25 | 2009-09-03 | Jfe Chemical Corp | NiCuZn BASED FERRITE TILE FOR ABSORBING RADIO WAVE |
| JP2010256036A (en) * | 2009-04-21 | 2010-11-11 | Yazaki Corp | Inner diameter measuring device |
| JP2017014047A (en) * | 2015-06-30 | 2017-01-19 | Tdk株式会社 | Ferrite sintered body, and ferrite core |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3422709B2 (en) * | 1998-12-04 | 2003-06-30 | ティーディーケイ株式会社 | Radio wave absorber |
| CN101511751B (en) | 2006-10-19 | 2012-11-21 | 日立金属株式会社 | Radio wave absorption material and radio wave absorber |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5133273A (en) * | 1974-09-12 | 1976-03-22 | Takeyoshi Myahara | Shindobutsutai no shijisochi |
| JPS5219046A (en) * | 1975-08-04 | 1977-01-14 | Tdk Corp | Microwave absorver |
-
1988
- 1988-06-02 JP JP63136494A patent/JP2794293B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5133273A (en) * | 1974-09-12 | 1976-03-22 | Takeyoshi Myahara | Shindobutsutai no shijisochi |
| JPS5219046A (en) * | 1975-08-04 | 1977-01-14 | Tdk Corp | Microwave absorver |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05206728A (en) * | 1991-08-13 | 1993-08-13 | Korea Advanced Inst Of Sci Technol | Ferrite-based wave absorber |
| JPH05259732A (en) * | 1991-08-13 | 1993-10-08 | Korea Advanced Inst Of Sci Technol | Manufacture of radio wave absorber |
| JP2009200436A (en) * | 2008-02-25 | 2009-09-03 | Jfe Chemical Corp | NiCuZn BASED FERRITE TILE FOR ABSORBING RADIO WAVE |
| JP2010256036A (en) * | 2009-04-21 | 2010-11-11 | Yazaki Corp | Inner diameter measuring device |
| JP2017014047A (en) * | 2015-06-30 | 2017-01-19 | Tdk株式会社 | Ferrite sintered body, and ferrite core |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2794293B2 (en) | 1998-09-03 |
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