KR920004001B1 - Electric wave absorber - Google Patents
Electric wave absorber Download PDFInfo
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- KR920004001B1 KR920004001B1 KR1019890014085A KR890014085A KR920004001B1 KR 920004001 B1 KR920004001 B1 KR 920004001B1 KR 1019890014085 A KR1019890014085 A KR 1019890014085A KR 890014085 A KR890014085 A KR 890014085A KR 920004001 B1 KR920004001 B1 KR 920004001B1
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- wave absorber
- electric wave
- magnetic material
- mixture
- thickness
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Hard Magnetic Materials (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
제 1 도는 본 발며의 전파흡수 특성도.1 is a wave absorption characteristic of the present foot.
본 발명은 전파흡수체에 관한 것이며, 특히 연성자성재료, 경성자성재료, 카본을 보지재에 혼합한 전파흡수체에 관한 것이다.The present invention relates to a radio wave absorber, and more particularly, to a radio wave absorber in which a soft magnetic material, a hard magnetic material, and carbon are mixed with a holding material.
전자통신공학의 발달에 의하여 전파의 사용이 밀집됨에 따라 이 전파가 건물, 철탑, 교량, 선박, 항공기 등으로부터 반사되어 전파장해가 발생되는 것을 방지하기 위하여 카본 전파흡수체, 페라이트 전파흡수체 또는 카본과트를 혼합한 전파흡수체가 공지되어 있다.As the use of radio waves is concentrated due to the development of electronic communication engineering, this radio wave is reflected from buildings, steel towers, bridges, ships, aircrafts, etc. to prevent radio interference from occurring. A radio wave absorber in which is mixed is known.
그러나 상기한 카본전파흡수체는 가격은 저렴하나 그 두께가 두꺼웁기 때문에 실용성이 적고, 페라이트 전파흡수체도 주파수 대역폭이 좁고 두께가 두꺼운 결정이 있었다. 그리하여 최근에는 도전손실재인 카본과 자성손실재인 페라이트를 혼합한 것이 실용화되고 있으나 두께 및 경제성면에서 만족스럽지는 못한 실정이다.However, the above-mentioned carbon wave absorber has a low price, but its practicality is low because its thickness is thick, and the ferrite wave absorber has a narrow frequency bandwidth and a thick crystal. Therefore, in recent years, a mixture of carbon, a conductive loss material, and ferrite, a magnetic loss material, has been put into practical use, but is not satisfactory in terms of thickness and economy.
그리고 상기 페라이트 전파흡수체의 전파흡수는 페라이트(일반식 MFe2O3로 표시되며, Mn, Ni, Mg, M, Zn, Co, 및 Cu를 1종이상 혼합한 것임)(이하 연성자성재료라 함)가 가지고 있는 자연공명현상을 이용한 것이므로 공명주파수를 높이면 정합주파수(matching frequnecy)도 높일 수 있고 흡수체의 주파수 대역폭도 넓게 할 수 있다.And the radio wave absorption of the ferrite wave absorber is ferrite (in general formula MFe 2 O 3 , Mn, Ni, Mg, M, Zn, Co, and Cu mixed one or more) (hereinafter referred to as a soft magnetic material Because it uses the natural resonance phenomenon of), increasing the resonance frequency can increase the matching frequnecy and broaden the frequency bandwidth of the absorber.
위의 현상을 이용한 적층형 전파흡수체가 일본국 특개소 49-130655 및 특개평 1-138799에 개시되어 있는 바 이것은 연성자성재료와 고무등의 유기고분자 재료를 혼합한 복합자성재료판에 고무자석을 적층부착한 것이므로 제조공정이 복잡하여 경제적이지 못하고 종래의 페라이트 전파흡수체에 비하여 두께는 얇아지지만 최근실용화되고 있는 카본페라이트 전파흡수체보다 두께가 두꺼웁고 주파수 대역폭도 양호하지 못한 점이 있다.Laminated electromagnetic wave absorbers using the above phenomenon are disclosed in Japanese Patent Laid-Open Nos. 49-130655 and 1-138799. Laminated rubber magnets are laminated on a composite magnetic sheet containing a mixture of soft magnetic materials and organic polymer materials such as rubber. Since it is attached, the manufacturing process is complicated and not economical, and the thickness becomes thinner than the conventional ferrite wave absorber, but the thickness is thicker than the recently used carbon ferrite wave absorber and the frequency bandwidth is not good.
본 발명은 상기한 전파흡수체의 결점을 개량하여 제조공정의 단순화를 기하고 경제성을 일층 향상시키며, 주파수대역폭도 넓히고 두께도 감소시킬 수 있도록 한 전파흡수체를 제공하는 것을 목적으로 한다.An object of the present invention is to provide a radio wave absorber which can improve the shortcomings of the radio wave absorber as described above, simplify the manufacturing process, further improve the economic efficiency, and widen the frequency bandwidth and reduce the thickness.
본 발명은 상기 목적을 달성하기 위하여 카본, 연성자성재료 및 경성자성재료를 보지재에 분산혼합한 것을 특징으로 한다.In order to achieve the above object, the present invention is characterized in that carbon, a soft magnetic material, and a hard magnetic material are dispersed and mixed in a holding material.
이하 상세히 설명한다.It will be described in detail below.
카본, 도전성그라파이트등과 같은 도전손실재, 일반식 M Fe2O3로 표시되는 연성자성재료(여기서 M은 Mn, Ni, Mg, Zn, Co 및 Cu를 1종 이상 혼합한 것임), 경성자성재료(Ba계, Sr계, Pb계, Alnico등)를 보지재에 분산혼합하여 스트립, 씨이트, 판재등으로 롤링, 압출 또는 사출등의 방법으로 성형하거나 페이스트 또는 도료상으로 형성하여서 된 것이다.Conductive loss materials such as carbon and conductive graphite, soft magnetic materials represented by the general formula M Fe 2 O 3 (where M is a mixture of one or more of Mn, Ni, Mg, Zn, Co, and Cu), and hard magnetic The material (Ba-based, Sr-based, Pb-based, Alnico, etc.) is dispersed and mixed in the holding material and formed into a strip, sheet, sheet, etc. by rolling, extrusion or injection, or formed into a paste or paint.
위에서 연성자성재료와 경성자성재료의 혼합비(중량비)합계는 87년 특허출원 공개 제2742호 또는 88년 특허출원공개 제 6726호에 기재된 연성자성재료의 범위내로 하는 것이 바람직하지만 정합주파수 및 대역폭등제 조건에 따라 그 범위외로도 할 수 있다.Although the sum of the mixing ratio (weight ratio) of the soft magnetic material and the hard magnetic material is preferably within the range of the soft magnetic material described in Patent Application Publication No. 2742 of 1987 or Patent No. 6726 of 1988, the matching frequency and bandwidth, etc. Depending on conditions, it can also be out of the range.
이상과 같은 본 발명은 제 1 도의 전파흡수 특성도에서 보는 바와 같이 중심주파수 5.5GHz에서 그 두께를 2.4mm까지 얇게 할 수 있으며 또한 전파흡수능(반사 감쇠향)도 30dB로 우수할 뿐 아니라 대역폭도 400MHz나 되는 것이다. 이는 종래 페라이트 소결체 또는 페라이트에 고무 또는 수지를 보지재로 한 것이 중심주파수 4GHz에서 두께 6.9mm, 대역폭 350MHz에 비하여 두께 및 대역폭에서 우수한 것을 알 수 있고 또한 연성자성재료, 카본 및 보지재를 혼합한 카본 페라이트 전파흡수체가 중심주파수 4.4GHz에서 두께 3.1mm, 대역폭 500MHz인바 본 발명은 이 카본페라이트 전파 흡수체에 비하여 대역폭은 약간 좁으나 두께를 훨씬 줄일 수 있다(소화 62년 4월 25일 일본국 오옴사발행, "전파흡수체"의 제 106 면 및 제 108 면의 표 참조)The present invention as described above can reduce the thickness to 2.4mm at the center frequency of 5.5GHz as shown in the radio wave absorption characteristics of FIG. 1, and also has an excellent radio absorption capacity (reflection attenuation) of 30dB and a bandwidth of 400MHz. It is me. It can be seen that the conventional ferrite sintered body or ferrite containing rubber or resin is superior in thickness and bandwidth compared to the thickness of 6.9 mm and the bandwidth of 350 MHz at the center frequency of 4 GHz, and the carbon mixed with the soft magnetic material, carbon and the retaining material. The ferrite absorber is 3.1mm thick and 500MHz bandwidth at the center frequency of 4.4GHz. Compared to the carbon ferrite absorber, the ferrite wave absorber has a slightly narrower bandwidth but can be reduced in thickness. , See tables on pages 106 and 108 of the "wave absorber").
또한 본 발명은 경성자성재료의 가격이 연성자성재료에 비하여 약 1/3에 불과하므로 저렴한 가격으로 간단한 제조공정에 의하여 생산할 수 있는 효과등이 있다.In addition, the present invention has an effect that can be produced by a simple manufacturing process at a low price because the price of the hard magnetic material is only about 1/3 compared to the soft magnetic material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019890014085A KR920004001B1 (en) | 1989-09-30 | 1989-09-30 | Electric wave absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019890014085A KR920004001B1 (en) | 1989-09-30 | 1989-09-30 | Electric wave absorber |
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| Publication Number | Publication Date |
|---|---|
| KR910007178A KR910007178A (en) | 1991-04-30 |
| KR920004001B1 true KR920004001B1 (en) | 1992-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019890014085A KR920004001B1 (en) | 1989-09-30 | 1989-09-30 | Electric wave absorber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100742108B1 (en) * | 2000-02-08 | 2007-07-25 | 소니 가부시끼 가이샤 | Electromagnetic wave absorber |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW349082B (en) * | 1996-02-08 | 1999-01-01 | Sumitomo Chemical Co | Coated fertilizer |
| KR100338603B1 (en) * | 2000-05-03 | 2002-05-27 | 김원현 | the manufacturing method of bio-capsule having in microorganism and the mineral |
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1989
- 1989-09-30 KR KR1019890014085A patent/KR920004001B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100742108B1 (en) * | 2000-02-08 | 2007-07-25 | 소니 가부시끼 가이샤 | Electromagnetic wave absorber |
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| Publication number | Publication date |
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| KR910007178A (en) | 1991-04-30 |
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