KR100606174B1 - Broad-band electromagnetic wave absorber - Google Patents

Broad-band electromagnetic wave absorber Download PDF

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KR100606174B1
KR100606174B1 KR1020040065672A KR20040065672A KR100606174B1 KR 100606174 B1 KR100606174 B1 KR 100606174B1 KR 1020040065672 A KR1020040065672 A KR 1020040065672A KR 20040065672 A KR20040065672 A KR 20040065672A KR 100606174 B1 KR100606174 B1 KR 100606174B1
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ferrite
weight
granite
alumina
radio wave
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KR20060017124A (en
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김동일
송재만
최동한
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract

본 발명은 광대역 전파흡수체에 관한 것이며, 상세하게는 페라이트ㆍ심성화강암ㆍ알루미나 복합분체를 옻칠에 분산한 광대역 전파흡수체에 관한 것으로서, 고주파영역에서 전파흡수능이 양호하고, 박형이며, 저렴하게 제조할 수 있도록 한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadband radio wave absorber, and more particularly, to a broadband radio wave absorber in which ferrite, deep granite, and alumina composite powder are dispersed in a lacquer. It would be.

본 발명은 페라이트 45~94.9 중량% 와 심성화강암 0.1~10 중량% 및 알루미나 5~45 중량% 를 혼합소성한 페라이트ㆍ심성화강암ㆍ알루미나 복합분체 30~80 중량%를 옻칠 20~70 중량% 에 분산한 것이다.The present invention disperses 30-80% by weight of ferritic, deep-hardened granite and alumina composite powder mixed with 45-94.9% by weight of ferrite, 0.1-10% by weight of deep granite and 5-45% by weight of alumina in 20-70% by weight of lacquer. It is.

페라이트, 심성화강암, 알루미나, 옻칠Ferrite, deep granite, alumina, lacquer

Description

광대역 전파흡수체 {BROAD-BAND ELECTROMAGNETIC WAVE ABSORBER}Broadband Wave Absorber {BROAD-BAND ELECTROMAGNETIC WAVE ABSORBER}

도 1은 본 발명의 실시예의 전파흡수 특성도1 is a wave absorption characteristic diagram of an embodiment of the present invention

도 2는 종래의 고무 페라이트 시트 전파흡수체의 전파흡수 특성도Figure 2 is a radio wave absorption characteristics of the conventional rubber ferrite sheet absorber

본 발명은 광대역 전파흡수체에 관한 것이며, 상세하게는 페라이트ㆍ심성화강암ㆍ알루미나 복합분체를 옻칠에 분산한 광대역 전파흡수체에 관한 것이다.The present invention relates to a broadband radio wave absorber, and more particularly, to a broadband radio wave absorber in which ferrite, deep granite, and alumina composite powder are dispersed in lacquer.

최근 각종 전자기기의 사용이 증가되고, 마이크로 프로세서 등의 1C 동작 주파수가 점차 높아지고 있어 불필요한 노이즈의 방사가 증가하고 있으며, 통신분야에서도 고주파대역의 주파수의 사용이 급속히 증가됨에 따라 노이즈를 방사하기 쉬우며, 또한 최근의 전자기기의 소형화, 저소비 전력화와 디지털화 추세에 따라 불요전자파에 대한 면역성(노이즈 내성)의 저하로 인하여 전자파장해(EMI)에 의한 전자기기의 오동작 문제를 발생시키고 있다.Recently, the use of various electronic devices is increasing, the 1C operating frequency of the microprocessor, etc. is gradually increasing, the emission of unnecessary noise is increasing, and in the communication field, it is easy to radiate noise as the use of the high frequency band is rapidly increased. In addition, recent miniaturization, low power consumption, and digitization of electronic devices have caused problems of electronic devices due to electromagnetic interference (EMI) due to a decrease in immunity (noise resistance) to unwanted electromagnetic waves.

상기한 문제점을 해결하기 위하여, 전자기기 내부에 전파흡수체를 배치하여 EMI 감소대책을 강구하고 있으며, 상기 전파흡수체는 결합재(고무 또는 합성수지)에 MnZn 또는 NiZn 페라이트를 분산한 시트(통상 고무 페라이트 시트라 함)가 주로 사용되고 있는 바, 상기 고무 페라이트 시트 전파흡수체에 분산되는 페라이트는 특정 주파수대에서 자벽의 이동 내지 스핀운동에 동반하는 공명현상에 의하여 손실이 커지는 현상이 발생하고, 상기와 같이 손실이 큰 페라이트에 특정 주파수의 전자파 가 입사되면 자성손실에 의하여 전자파 에너지가 열에너지로 변환되면서 전자파를 흡수하는 것이다.In order to solve the above problems, a radio wave absorber is disposed inside the electronic device to reduce EMI, and the radio wave absorber is a sheet in which MnZn or NiZn ferrite is dispersed in a binder (rubber or synthetic resin). As the ferrite dispersed in the rubber ferrite sheet radio absorber is mainly used, the loss occurs due to resonance caused by the movement or spin of the magnetic walls in a specific frequency band. When an electromagnetic wave of a specific frequency enters, electromagnetic energy is converted into thermal energy by magnetic loss, thereby absorbing electromagnetic waves.

상기 고무 페라이트 시트는 MnZn 페라이트 70 중량% 를 고무 30 중량% 에 분산하여 두께 3mm 의 시트로 성형할 경우 500MHz~10GHz 주파수대역에서 2-5dB 정도의 반사감쇠량을 얻을 수 있는 것이다.(도 2 참조)When the rubber ferrite sheet is formed by dispersing 70% by weight of MnZn ferrite in 30% by weight of rubber and forming a sheet having a thickness of 3 mm, the amount of reflection attenuation of about 2-5 dB can be obtained in the frequency band of 500 MHz to 10 GHz.

그러나 상기한 고무 페라이트 시트 전파흡수체는 페라이트의 공명현상에 의한 손실을 이용하여 전자파를 흡수하는 것임으로 페라이트에 고주파 자계가 인가되었을 때 결합재에 분산된 페라이트가 절연성을 갖는 물질로 도포되어 있으면 페라이트끼리 접속되어도 전기저항이 크게 되어 손실을 증가시키지만, 절연성을 갖는 물질로 도포되어 있지 않으면 페라이트끼리 완전히 연속되어 전기저항이 저하하여 페라이트 내부에 전류가 유기됨으로 전파흡수능이 낮아지게 됨으로 전파흡수능을 증대하기 위하여 그 두께를 두껍게 할 수밖에 없는 것이다.However, the above-mentioned rubber ferrite sheet absorber absorbs electromagnetic waves by using the loss caused by the resonance of ferrite. When the high frequency magnetic field is applied to the ferrite, ferrite dispersed in the binder is coated with an insulating material so that the ferrites are connected to each other. Although the electrical resistance increases, the loss increases, but if it is not coated with an insulating material, the ferrites are completely continuous and the electrical resistance decreases, and the electric current is induced inside the ferrite, so that the electric wave absorption capacity is lowered. There is no choice but to thicken the thickness.

상기와 같이 전파흡수능이 낮아지고 두께가 두껍게 되면, 예를 들면 최근 소형화되고 있는 휴대용 전화기 등의 전자기기에 이를 부설할 경우, 전자기기의 소형화에 부응하지 못할 뿐 아니라 EMI 감소대책이 만족스럽지 못하게 됨으로써 고주파영역에서 전파흡수능이 양호하고 그 두께가 박형인 전파흡수체의 개발이 요구되고 있다.As described above, when the radio wave absorbing ability is lowered and the thickness becomes thicker, for example, when the electronic device such as a portable telephone, which has been miniaturized recently, is not installed, it does not meet the miniaturization of the electronic device and the measures to reduce EMI are not satisfactory. There is a demand for the development of a radio wave absorber having good radio wave absorbing ability in a high frequency region and having a thin thickness.

본 발명자 등은 상기한 요구에 부응하기 위하여, MnZn 페라이트 90~99.9 중량% 와 심성화강암 0.1~10 중량% 를 혼합소성한 페라이트ㆍ심성화강암 복합분체 30~80 중량% 를 고무 또는 염소화 폴리에틸렌 20~70 중량% 에 분산한 광대역 전파흡수체를 2001년 특허출원 제 70016 호(이하 "전자" 라 함)로 제안한 바 있다. In order to meet the above-mentioned demands, the present inventors have prepared 30-80% by weight of ferritic and deep-hardened granite composite powders in which 90% to 99.9% by weight of MnZn ferrite and 0.1% to 10% by weight of deep granite are mixed with rubber or chlorinated polyethylene. A broadband wave absorber dispersed in weight percent was proposed in 2001 Patent Application No. 70016 (hereinafter referred to as "electronic").

상기한 페라이트ㆍ심성화강암 복합분체로 된 전파흡수재는 페라이트에 심성화강암을 코팅하여 고주파영역에서 페라이트의 도전율을 저감시킴으로써 페라이트의 투자율이 저하되지 않고, 전기저항도 크게 유지할 수 있게 되어 두께 3mm 의 시트상으로 형성하여서 500MHz~2.5GHz 주파수대역에서 반사감쇠량 14dB 을, 2.5~5GHz 주파수대역에서 반사감쇠량 14~8dB 의 광대역이고, 우수한 전파흡수능을 얻을 수 있었다.The radio wave absorber made of the above ferrite and deep granite composite powder is coated with ferrite granite on the ferrite to reduce the ferrite conductivity in the high frequency region so that the permeability of the ferrite is not lowered and the electrical resistance is also maintained. In this case, it was possible to obtain an excellent radio wave absorbing capacity of 14 dB in the attenuation amount of 14 dB in the frequency band of 500 MHz to 2.5 GHz and 14 to 8 dB in the amount of reflection attenuation in the frequency band of 2.5 to 5 GHz.

또한 본 발명자 등은 옻칠이 유전손실이 큰 것에 착안하여, 상기 페라이트ㆍ 심성화강암 복합분체 30~80 중량% 를 옻칠 20~70 중량% 에 분산하여 페이스트 상으로 형성한 옻칠을 소재로 한 전파흡수체를 2002년 특허출원 제 8615 호(이하 "후자" 라 함)로 제안한 바 있으며, 상기 옻칠 소재 전파흡수체는 두께 3mm 의 시트 상으로 형성하여서 500MHz~10GHz 주파수대역에서 16~19dB 의 광대역이고, 우수한 전파흡수능을 얻었다.In addition, the present inventors pay attention to the fact that the lacquer has a large dielectric loss, and a radio wave absorber made of a lacquer-based material is formed by dispersing 30-80% by weight of the ferrite-deep granite composite powder in 20-70% by weight of the lacquer. It was proposed in 2002 Patent Application No. 8615 (hereinafter referred to as "the latter"), the lacquer material radio absorber is formed in the form of a sheet of 3mm thick, has a broadband of 16 ~ 19dB in the 500MHz ~ 10GHz frequency band, excellent radio absorption capacity Got.

상기한 본 발명자 등의 선출원에서 페라이트에 코팅되는 심성화강암은 SiO₂(규사)와 Al₂O₃(알루미나)가 주성분(상세조성은 선출원 명세서 참조)으로서, 페라이트와 심성화강암을 혼합소성할 때 주성분 등이 페라이트에 일부 침식됨과 동시 에 코팅되어 Al₂O₃가 절연체로서의 기능을 함으로써 고주파영역에서 페라이트의 투자율이 저하되지 않고, 전기저항을 크게 유지하기 때문에 전파흡수능이 우수하게 되는 것이다. In the above-described application of the present inventors, the deep granite coated with ferrite is composed of SiO₂ (silica sand) and Al₂O₃ (alumina) as the main component (detailed composition is referred to the specification of the application). Al ₂ O ₃ is coated at the same time and partially eroded, so that the permeability of ferrite in the high frequency region is not lowered and the electrical resistance is maintained.

그러나 상기한 전자의 것은 2GHz 이상의 고주파수영역에서, 후자는 4GHz 이상의 고주파수영역에서 전파흡수능이 만족스럽지 못한 바,(전파흡수체는 전자파 에너지를 99% 흡수하는 값인 반사감쇠량 20dB 를 목표로 하는 경우가 많음)However, the former is unsatisfactory in the high frequency region of 2 GHz or higher, and the latter is not satisfactory in the high frequency region of 4 GHz or higher. (The radio absorber often aims at a reflection attenuation of 20 dB, which absorbs 99% of electromagnetic energy.)

상기한 선출원에서 페라이트에 코팅되는 심성화강암은 주 절연기능을 하는 Al₂O₃(알루미나)의 조성비가 10% 미만임으로 상기 고주파수영역 이상에서는 페라이트의 절연기능이 저하되어서 페라이트에 와전류손실이 생겨 투자율이 저하되기 때문이다.Since the deep granite coated on ferrite in the above-mentioned source has a composition ratio of Al₂O₃ (alumina) which serves as the main insulation function, the ferrite is degraded due to the eddy current loss in the ferrite and the permeability of the ferrite in the high frequency region. to be.

또한 상기한 선출원은 그 두께가 3mm 임으로 전자기기의 소형화 추세에 부응하는 데에 미흡한 실정이다.In addition, the above-described application is insufficient to meet the trend of miniaturization of electronic devices because the thickness is 3mm.

본 발명자들은 상기한 선출원의 페라이트의 절연기능 저하의 개선 및 두께의 감소 등에 대하여 많은 연구를 하여서 본 발명을 완성하였다.The present inventors have done much research on the improvement of the fall of the insulation function of the ferrite of the said prior application, the reduction of thickness, etc., and completed this invention.

본 발명은 고주파영역에서 전파흡수능이 양호하고, 박형이며, 저렴하게 제조할 수 있는 광대역 전파흡수체를 제공하는 것을 목적으로 한다.An object of the present invention is to provide a broadband radio wave absorber having good radio wave absorption ability in a high frequency region, which can be manufactured thinly and inexpensively.

상기한 목적을 달성하기 위하여, 본 발명은 페라이트 45~94.9 중량% 와 심성화강암 0.1~10 중량% 및 알루미나 5~45 중량% 를 혼합소성한 페라이트ㆍ심성화강암ㆍ알루미나 복합분체 30~80 중량% 를 옻칠 20~70 중량% 에 분산한 것이다.In order to achieve the above object, the present invention is the ferrite, core granite, alumina composite powder 30-80% by weight of ferritic 45 ~ 99.4% by weight of ferritic granite, 0.1 ~ 10% by weight and alumina 5 ~ 45% by weight It is dispersed in 20 to 70% by weight of lacquer.

본 발명은 MnZn 또는 NiZn 페라이트 45~94.9 중량% 와 심성화강암 0.1~10 중량% 및 알루미나 5~45 중량% 를 혼합하여 950~1250℃ 에서 1~3시간 소성하여 페라이트ㆍ심성화강암ㆍ알루미나 복합분체를 제조하고, 상기 페라이트ㆍ심성화강암ㆍ알루미나 복합분체 30~80 중량% 를 옻칠 20~70 중량% 에 분산하여 페이스트 상으로 형성한 것이다.The present invention is mixed with 45 ~ 94.9% by weight of MnZn or NiZn ferrite, 0.1 ~ 10% by weight of deep granite and 5 to 45% by weight of alumina, and then calcined at 950-1250 ° C for 1 to 3 hours to form a ferrite-hardened granite and alumina composite powder. 30 to 80% by weight of the ferrite, deep granite, and alumina composite powder are dispersed in 20 to 70% by weight of lacquer to form a paste.

상기 심성화강암은 주성분으로서 SiO₂79.7 중량% 및 Al₂O₃9.87 중량% 를 함유하고 있는 바, 이들은 소성시에 특히 페라이트에 SiO₂의 일부가 침식됨으로써 Al₂O₃의 코팅이 신속하고 양호하게 되는 것이다.The deep granite rock contains 79.7% by weight SiO2 and 9.87% by weight Al2O3 as the main components, which are particularly effective when the part of SiO2 is eroded into the ferrite during firing, so that the coating of Al2O3 is quick and good.

상기 알루미나는 열전도율, 전기절연성 및 고주파손실이 양호한 반면에, 페라이트에 직접 코팅이 어려움으로 상기 심성화강암에 함께 혼합하여 소성하면 심성화강암에 함유한 SiO₂의 침식에 의하여 페라이트에 코팅이 신속하게 됨과 동시에 절연체로서의 기능을 양호하게 달성함으로써 고주파영역에서 페라이트의 투자율이 저하되지 않고, 전기저항도 크게 유지할 수 있으며, 또한 열전도율이 양호함으로 전자파를 흡수할 때 변환되는 열에너지를 신속히 발산하여 전파흡수체의 내구성을 양호하게 유지할 수 있는 것이다.While the alumina has good thermal conductivity, electrical insulation, and high frequency loss, it is difficult to directly coat the ferrite, and when mixed and fired together with the deep granite, the alumina is quickly coated with ferrite by the erosion of SiO2 contained in the deep granite. By achieving good function, ferrite does not decrease in high frequency region, electrical resistance can be maintained largely, and thermal conductivity is good, and heat energy converted when absorbing electromagnetic waves can be quickly dissipated to improve durability of radio wave absorber. It is sustainable.

상기 심성화강암 및 알루미나의 총혼합량은 5.1~55 중량% 인바, 5.1 중량% 이하이면 페라이트의 절연성이 취약하여 고주파영역에서 페라이트의 투자율이 저하됨으로 전파흡수능이 낮아지게 되고, 55 중량% 이상이면 페라이트가 고립됨으로써 투자율이 작게 되어 전파흡수능이 낮아지게 되는 것이다.If the total amount of deep granite and alumina is 5.1 to 55% by weight, the ferrite is weak in the high frequency region because the insulation of ferrite is weak when the amount is less than 5.1 to 55% by weight. By isolation, the magnetic permeability is small, and the radio wave absorption capacity is lowered.

상기 페라이트의 입경은 0.5~10㎛ 이 바람직하고, 상기 심성화강암 및 알루 미나의 입경은 100~1,000㎚ 가 바람직하다.The particle diameter of the ferrite is preferably 0.5 to 10 µm, and the particle diameter of the deep granite and alumina is preferably 100 to 1,000 nm.

상기 옻칠은 유전손실이 양호하여 그 자체만으로 18GHz 대역까지 1~2dB 의 전파흡수능을 가지고 있고, 입사되는 전자파의 반사를 억제함으로써 기존의 유기결합재인 고무, 염소화 폴리에틸렌, 폴리비닐 클로라이드 등에 비하여 전파흡수능을 더욱더 양호하게 할 수 있는 것이다.The lacquer has a good dielectric loss and has a radio absorption capability of 1 to 2 dB up to 18 GHz by itself, and by suppressing reflection of incident electromagnetic waves, the lacquer has a radio absorption capability compared to rubber, chlorinated polyethylene, and polyvinyl chloride, which are conventional organic binders. It can be made even better.

(실시예 1)(Example 1)

심성화강암 분체 3 중량%, MnZn 페라이트 분체 67 중량%, 알루미나 분체 30중량% 를 혼합하여 1150℃ 에서 3시간 소성한 후 분쇄하여 페라이트ㆍ심성화강암ㆍ알루미나 복합분체를 제조하고, 상기 페라이트ㆍ심성화강암ㆍ알루미나 복합분체 80 중량% 를 옻칠 20 중량% 에 분산하여 페이스트 상으로 형성하여서 테이블 위에 종이를 깔고 종이 위에 롤에 의하여 수회를 도포하여 두께 2mm 의 시트를 제조한 후 시트에서 종이를 제거하고 동축관법에 의하여 전파흡수능을 측정한 바, 도 1과 같이 광대역이고, 전파흡수능이 우수한 전파흡수체를 얻었다.3% by weight of granulated granite powder, 67% by weight of MnZn ferrite powder, and 30% by weight of alumina powder were mixed and calcined at 1150 ° C. for 3 hours, and then pulverized to prepare ferrite, granite granite, and alumina composite powder. 80% by weight of the alumina composite powder was dispersed in 20% by weight of lacquer to form a paste. The paper was laid on a table and applied several times with a roll on a paper to prepare a sheet having a thickness of 2 mm, and then the paper was removed from the sheet. As a result, the radio wave absorbing ability was measured. As shown in FIG. 1, a radio wave absorber having a wide band and excellent radio wave absorbing ability was obtained.

(실시예 2)(Example 2)

심성화강암 분체 3 중량%, MnZn 페라이트 분체 56 중량%, 알루미나 분체 11 중량% 를 혼합하여 1250℃ 에서 3시간 소성한 후 분쇄한 페라이트ㆍ심성화강암ㆍ알루미나 복합분체 80 중량% 를 옻칠 20 중량% 에 분산하여 페이스트 상으로 형성하여 상기 실시예 1과 같은 방법으로 두께 2mm 로 제조한 후, 실시예 1과 같은 방법으로 전파흡수능을 측정한 바, 도 1과 같이 광대역이고, 전파흡수능이 우수한 전파흡수체를 얻었다.3% by weight of granulated granite powder, 56% by weight of MnZn ferrite powder and 11% by weight of alumina powder were calcined at 1250 ° C. for 3 hours, and 80% by weight of the ground ferrite, granite granite and alumina composite powder were dispersed in 20% by weight of lacquer. And formed into a paste to form a thickness of 2 mm in the same manner as in Example 1, and then measured the radio wave absorption ability in the same manner as in Example 1, to obtain a radio wave absorber having a broadband and excellent radio wave absorption capability as shown in FIG. .

(실시예 3)(Example 3)

심성화강암 분체 3 중량%, MnZn 페라이트 분체 78 중량%, 알루미나 분체 19 중량% 를 혼합하여 1100℃ 에서 3시간 소성한 후 분쇄한 페라이트ㆍ심성화강암ㆍ알루미나 복합분체를 실시예 1과 같은 조성, 방법 및 두께로 제조하여 실시예 1과 같은 방법으로 전파흡수능을 측정한 바, 도 1과 같이 광대역이고, 전파흡수능이 우수한 전파흡수체를 얻었다.3% by weight of granulated granite powder, 78% by weight of MnZn ferrite powder, and 19% by weight of alumina powder were mixed at 1100 ° C. for 3 hours, and then pulverized ferrite, granite granite, and alumina composite powder were prepared in the same composition, method, and method. When prepared by the thickness and the radio wave absorption capacity was measured in the same manner as in Example 1, a radio wave absorber having a broadband and excellent radio wave absorption capacity as shown in FIG.

이상과 같이 본 발명은 페라이트에 심성화강암 및 알루미나를 혼합소성한 페라이트ㆍ심성화강암ㆍ알루미나 복합분체를 유전손실이 비교적 크고 접착성이 양호한 옻칠에 분산하여 페라이트끼리의 절연을 양호하게 유지함으로서, 고주파영역에서 페라이트의 투자율이 감소되지 않고 전기저항도 크게 유지할 수 있기 때문에 광대역에서 전파흡수능이 양호하고, 두께가 박형인 전파흡수체를 얻을 수 있음으로 전자기기의 소형화 추세에 부응할 수 있고, 또한 페라이트에 심성화강암 및 알루미나를 혼합하여 소성만 하면 페라이트에 심성화강암 및 알루미나가 양호하게 코팅됨으로 저렴하고 간편하게 생산할 수 있는 것이다.As described above, the present invention disperses ferrite, deep granite, and alumina composite powder mixed with ferrite granite and alumina in a ferrite in a lacquer with a relatively high dielectric loss and good adhesion to maintain good insulation between ferrites. Since the permeability of ferrite is not reduced and the electrical resistance can be maintained largely, it is possible to meet the trend of miniaturization of electronic devices by obtaining a radio wave absorber having a good radio wave absorbing capacity and a thin thickness in a wide band, and also to the ferrite core granite And alumina is mixed with alumina and the ferrite granite and alumina are coated well, so that it is possible to produce cheaply and simply.

Claims (1)

페라이트 45~94.9 중량% 와 심성화강암 0.1~10 중량% 및 알루미나 5~45 중량% 를 혼합소성한 페라이트ㆍ심성화강암ㆍ알루미나 복합분체 30~80 중량% 를 옻칠 20~70 중량% 에 분산한 광대역 전파흡수체.Broadband radio wave with 30 ~ 80% by weight of ferrite, deep granite, and alumina composite powder mixed with 45 ~ 94.9% by weight of ferrite, 0.1 ~ 10% by weight of granite granite, and 5 ~ 45% by weight of alumina Absorber.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR980001904A (en) * 1996-06-27 1998-03-30 정재영 Manufacturing method of harmful electromagnetic wave absorbing neutralized ceramic sintered body
KR19980085370A (en) * 1997-05-26 1998-12-05 김종운 Method for manufacturing far-infrared radiation ceramic using waste ferrite core
JP2000021620A (en) 1998-04-28 2000-01-21 Hitachi Metals Ltd Compound magnetic substance and manufacture thereof
JP2000077222A (en) 1998-09-02 2000-03-14 Hitachi Metals Ltd Porous composite magnetic body and manufacture of the same
KR20030039096A (en) * 2001-11-12 2003-05-17 김동일 Broad-Band Electromagnetic Wave Absorber by NC-added Rubber Ferrite

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR980001904A (en) * 1996-06-27 1998-03-30 정재영 Manufacturing method of harmful electromagnetic wave absorbing neutralized ceramic sintered body
KR19980085370A (en) * 1997-05-26 1998-12-05 김종운 Method for manufacturing far-infrared radiation ceramic using waste ferrite core
JP2000021620A (en) 1998-04-28 2000-01-21 Hitachi Metals Ltd Compound magnetic substance and manufacture thereof
JP2000077222A (en) 1998-09-02 2000-03-14 Hitachi Metals Ltd Porous composite magnetic body and manufacture of the same
KR20030039096A (en) * 2001-11-12 2003-05-17 김동일 Broad-Band Electromagnetic Wave Absorber by NC-added Rubber Ferrite

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