KR890004506B1 - Microwaves absorbent - Google Patents
Microwaves absorbent Download PDFInfo
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- KR890004506B1 KR890004506B1 KR1019860003687A KR860003687A KR890004506B1 KR 890004506 B1 KR890004506 B1 KR 890004506B1 KR 1019860003687 A KR1019860003687 A KR 1019860003687A KR 860003687 A KR860003687 A KR 860003687A KR 890004506 B1 KR890004506 B1 KR 890004506B1
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- South Korea
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- radio wave
- powder
- wave absorber
- ferrite
- absorber
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/76—Prevention of microwave leakage, e.g. door sealings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
Abstract
Description
본 발명은 전파흡수체에 관한 것으로서, 더 상세히 기술하면 카본 페라이트 전파흡수체의 개량에 관한 것이다.The present invention relates to a radio wave absorber, and more particularly, to an improvement of a carbon ferrite wave absorber.
전파흡수체는 최근 급증하고 있는 각종 전파 기기로부터 발생한 전파가 전자기기의 외부로 누설되어 다른 기기의 오동작을 일으키고, 인체 및 동식물등에 악영향을 미치며 또는 통상장해를 일으키는 것을 방지하거나, 항공기, 선박, 대형철구조물, 탱크, 대형차량, 대형건축물 등으로부터 반사되는 전파를 제거하기 위하여 이용되어 왔다.The radio wave absorber prevents radio waves from various radio equipments that are rapidly increasing to the outside of the electronic equipment, causing malfunction of other equipment, adversely affecting the human body, animals and plants, or causing normal obstacles, It has been used to remove radio waves reflected from structures, tanks, large vehicles, large buildings, and the like.
예를들어 설명하면, 최근 널리 보급되고 있는 전자기기의 하나인 전자레인지는 마그네트론이라 불리우는 발진관에 전원을 공급하여 발생시킨 전파가 전자레인지 내부에 복사되어 수장된 음식물을 단시간내에 조리하는 유용한 기구이다. 그러나, 음식물을 조리하고 남은 전파가 문짝틈으로 새어 나오면 인체와 다른 전자 기기에 치명적인 영향을 미칠 수 있으므로 본체와 문짝사이에 전파흡수체를 설치하여 누설전파를 흡수하고 있다.For example, a microwave oven, which is one of the most widely used electronic devices, is a useful tool for cooking food stored in a microwave within a short time due to the radiation generated by supplying power to an oscillation tube called a magnetron. . However, when the remaining radio waves leak through the door after cooking, it can have a devastating effect on the human body and other electronic devices. Thus, a radio wave absorber is installed between the main body and the door to absorb leakage waves.
또 다른 예로는 선박용 레이나 주변의 철구조물에서 반사된 전파가 레이다에 수신되어 위상(ghost)을 발생시켜 선박의 안전운항을 저해하는 요인이 되며, 대형 철구조물로 된 교량등에서 반사되는 전파도 마찬가지로 위상을 발생시켜 선박 사고를 일으킬 수 있다.In another example, the radio wave reflected from the ship's radar or the surrounding steel structures is received by the radar to generate ghosts, which hinders the safe operation of the ship, and the wave reflected from bridges made of large steel structures is similarly phased. Can cause a ship accident.
뿐만 아니라 고층 건축물로 부터 반사되는 전파가 TV 수상기의 화면에 고스트를 일으키기도 한다.In addition, radio waves reflected from high-rise buildings cause ghosts on the screen of the TV set.
상기한 전파의 흡수 및 반사 방지를 위하여, 초기에는 도전 손실을 이용한 카본 전파흡수체가 그 뒤에 자성손실을 이용한 페라이트 전파흡수체가 공지되었으나, 위의 두 전파흡수체는 두께의 정밀도 유지와 사용두께 및 시공성에 많은 문제점이 있다.In order to prevent the absorption and reflection of the above-mentioned radio waves, initially, a carbon wave absorber using conductive loss is known, followed by a ferrite wave absorber using magnetic loss. However, the above two wave absorbers are used for maintaining the accuracy of the thickness and for the use thickness and workability. There are many problems.
그리고 위와 같은 문제점을 개선하기 위한 카본 페라이트 전파흡수체가 일본국 특허출원공개 소54-127,000호에 개시된 바 있으나 이것도 그 두께 및 전파흡수능이 바람직하지 못하였다. 또, 카본페라이트 전파흡수체의 경우에도 전파흡수체의 조성비에 따라 흡수능이 서로 다르며, 전파흡수체의 두께에 따라 시공성에 치명적인 영향을 미친다. 특히, 시공성이 비교적 양호한 페인트형 전파흡수체의 경우 그 도막 두께 및 도막의 균일성을 유지하는데 많은 문제점이 있음을 알게 되었다.In addition, the carbon ferrite radio wave absorber for improving the above problems has been disclosed in Japanese Patent Application Laid-Open No. 54-127,000, but this also has a undesirable thickness and radio wave absorption ability. In addition, in the case of the carbon ferrite radio wave absorber, the absorbing ability is different depending on the composition ratio of the radio wave absorber, and it has a fatal effect on the workability depending on the thickness of the radio wave absorber. In particular, it has been found that paint-type radio wave absorbers having good workability have many problems in maintaining their thickness and uniformity.
본 발명도 위와 같은 문제점을 해결하기 위해 발명한 것으로서 도막 두께를 얇게 할 뿐만아니라, 전파흡수능을 양호하게 하고 그 시공성을 양호하게 함을 목적으로 한 것으로 실시예에 의거 상세히 설명한다.The present invention is also invented to solve the above problems, as well as to reduce the thickness of the coating film, as well as to improve the radio wave absorption ability and the workability will be described in detail based on the embodiment.
[실시예 1]Example 1
분말상의 자성재료(일반적으로 페라이트라고 불리우는 것으로서, M·Fe2O3로 표현되며, M은 Mn, Mg, Zn, Co, Cu등의 2가 금속을 의미한다) 91중량%와 분말상의 카본 1중량% 및 보지재(保持材) 8중량%를 혼련기에 장입 혼련한후 압출하여 두께 2.5mm, 폭 7.5mm 스트립을 만들어 전자레인지의 문짝에 설치한 후 전파누설량을 KS의 전자 레인지 누설전파 측정법에 따라 측정한 결과, 전파누설량이 0.05mW/㎠로 양호한 결과를 얻었다.91 wt% powdered magnetic material (generally called ferrite, represented by M · Fe 2 O 3 , M means divalent metal such as Mn, Mg, Zn, Co, Cu, etc.) and powdered carbon 1 After loading and kneading the weight percent and 8 weight percent of the holding material into the kneader, extruding it into strips of 2.5 mm thick and 7.5 mm wide, and installing them on the door of the microwave oven, the amount of radio leakage is measured by KS microwave leak propagation method. As a result of the measurement, the radio wave leakage amount was 0.05 mW / cm 2 to obtain a good result.
[실시예 2]Example 2
분말상 또는 플레이크상의 자성재료분말 75중량%의 섬유상 또는 플레이크상의 카본 10중량%를 보지재 15중량%를 혼련기에 장입하여 혼련한 후, 두께 2.5mm의 판상 전파흡수체(30cm×30cm)를 만들었다. 이 전파흡수체의 반사 감쇠량을 중심주파수 5.0GHz에서 반사 전력법으로 측정한 결과 33.2dB의 우수한 흡수능이 얻어졌다.After mixing 75% by weight of powdery or flake-like magnetic material powder, 10% by weight of fibrous or flake carbon, 15% by weight of holding material was kneaded into a kneader, a 2.5 mm thick plate-shaped radio wave absorber (30 cm x 30 cm) was formed. As a result of measuring the reflection attenuation of the radio wave absorber at the center frequency of 5.0 GHz by the reflected power method, an excellent absorption capacity of 33.2 dB was obtained.
[실시예 3]Example 3
분말상 또는 섬유상의 자성재료 67중량%와 섬유상 또는 플레이크상의 카본 15중량%에 보지재 18중량%를 페인트용 배합기에 장입 혼합하여 전파흡수 도료를 만들었다. 이 도료를 금속판위에 두께 1.65mm가 되도록 도장하여 건조시킨 후, 중심주파수 9.8GHz에서 위 전파흡수체의 반사감쇠량을 반사 전력법으로 측정한 결과 32.0dB라는 탁월한 흡수능이 얻어졌다.67% by weight of powdery or fibrous magnetic material, 15% by weight of fibrous or flake carbon and 18% by weight of retaining material were charged and mixed in a paint mixer to form a radio wave absorbing paint. After coating the paint to a thickness of 1.65 mm on a metal plate and drying it, an excellent absorption capacity of 32.0 dB was obtained by measuring the amount of reflection attenuation of the radio wave absorber at the center frequency of 9.8 GHz by the reflected power method.
위 전파흡수체의 제조에 사용되는 자성재료로서는 연성자성 재료(Soft ferrite powder), 경성자성 재료(hard ferrite powder), 카보닐 철 또는 반도체 분쇄재료등이 공지되어 있으며, 또한 산화철에 1종 또는 2종 이상의 2가 금속을 포함한 페라이트도 사용할 수 있다.As the magnetic material used for the preparation of the radio wave absorber, soft ferrite powder, hard ferrite powder, carbonyl iron or semiconductor crushing materials are known. Ferrite containing the above-mentioned divalent metal can also be used.
또, 위 전파흡수체의 제조에 사용되는 카본으로는 유기물로부터 얻은 각종 카본 블랙류와 토상흑연, 인상흑연 등의 무기질 카본 및 각종 카본섬유 등이 공지되어 있다. 한편, 위 전파흡수체 제조용 보지재로서는 각종 유기고분자, 예를들면 크로로프렌 고무, 폴리올레핀 수지, 폴리아미드 수지, 에폭시 수지, 폴리에스터 수지, 폴리우레탄 수지, 아클릴 수지, 실리콘 수지, 알키드 수지, 염소화프로필렌 및 에틸렌 고무, PVC등 대부분의 수지가 사용될 수 있으며, 또한 위에 기술한 각종 도료용 고분자 수지의 비클(페인트 기재)도 공지된 보지재중의 하나이다. 뿐만 아니라, 실리카 분말, 세라믹 분말, 고령토 분말, 탈크 분말, 탄산 칼슘분말 등 각종 무기질 분말도 보지재로 사용할 수 있다. 이상과 같은 본 발명은 그 두께를 얇게 할 수 있으므로 시공성이 향상 될뿐만 아니라 전파흡수능도 우수하고 페이스트 상으로도 제조할 수 있어 흘러내림도 방지되므로 도막 두께로 균일하게 할수 있는 등의 효과가 있다.In addition, various carbon blacks obtained from organic materials, inorganic carbons such as earth graphite and impression graphite, various carbon fibers, and the like are known as carbons used in the preparation of the above-mentioned radio wave absorber. On the other hand, as the holding material for producing the radio wave absorber, various organic polymers such as chloroprene rubber, polyolefin resin, polyamide resin, epoxy resin, polyester resin, polyurethane resin, acryl resin, silicone resin, alkyd resin, chlorination Most resins, such as propylene and ethylene rubber and PVC, can be used, and also the vehicle (paint base) of the above-mentioned polymer resin for various paints is one of the known holding materials. In addition, various inorganic powders such as silica powder, ceramic powder, kaolin powder, talc powder and calcium carbonate powder can be used as the holding material. Since the present invention as described above can be made thin, the workability can be improved, the radio wave absorbing ability is excellent, and the paste can be prepared in the form of a paste.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019860003687A KR890004506B1 (en) | 1986-05-12 | 1986-05-12 | Microwaves absorbent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019860003687A KR890004506B1 (en) | 1986-05-12 | 1986-05-12 | Microwaves absorbent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR870011815A KR870011815A (en) | 1987-12-26 |
| KR890004506B1 true KR890004506B1 (en) | 1989-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019860003687A KR890004506B1 (en) | 1986-05-12 | 1986-05-12 | Microwaves absorbent |
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| KR (1) | KR890004506B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9559715B2 (en) | 2014-07-31 | 2017-01-31 | Chung-Ang University Industry-Academy Cooperation Foundation | Successive approximation resister analog-to-digital converter having separable dual capacitor array |
-
1986
- 1986-05-12 KR KR1019860003687A patent/KR890004506B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9559715B2 (en) | 2014-07-31 | 2017-01-31 | Chung-Ang University Industry-Academy Cooperation Foundation | Successive approximation resister analog-to-digital converter having separable dual capacitor array |
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| Publication number | Publication date |
|---|---|
| KR870011815A (en) | 1987-12-26 |
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