KR200262142Y1

KR200262142Y1 - Broad-Band Electromagnetic Wave Absorber by NC-added Ferrite

Info

Publication number: KR200262142Y1
Application number: KR2020010000484U
Authority: KR
Inventors: 김동일; 배대환; 손준영; 배재영; 구동우
Original assignee: 김동일
Priority date: 2001-01-09
Filing date: 2001-01-09
Publication date: 2002-03-18

Abstract

본 고안은 차세대 재료인 심성화강암(NC ; Natural Ceramics, 주성분 : SiO2 79.7 wt%, Al2O3 9.87wt%, Fe2O3 0.21 wt%, K2O 3.79 wt%, Na2O 2.8 wt%, CaO 1.59 wt%, MgO 0.86 wt%, Ge 0.5-2 ppm)을 MnZn계 페라이트에 최적의 비율로 첨가하고 1100-1250 ℃에서 소결 처리함으로써 얻어지는 대체 페라이트를 사용한 전파흡수체에 관한 것으로서, 이들은 가격이 10배 정도 비싼 NiZn계 페라이트와 동일하거나 보다 우수한 특성을 가지는 것이다.The present invention is a next-generation material of deep granite (NC; Natural Ceramics, main component: SiO2 79.7 wt%, Al2O3 9.87wt%, Fe2O3 0.21 wt%, K2O 3.79 wt%, Na2O 2.8 wt%, CaO 1.59 wt%, MgO 0.86 wt% , Which relates to a radio wave absorber using an alternative ferrite obtained by adding Ge 0.5-2 ppm) to an MnZn-based ferrite at an optimum ratio and sintering at 1100-1250 ° C., which is the same as NiZn-based ferrite, which is about 10 times as expensive. It has better characteristics.

Description

Broadband Electromagnetic Wave Absorber using Natural Ceramic Additive Ferrite

MnZn계 페라이트는 초투자율이 높고 완화주파수가 낮아 전자파 재료로 사용할 경우, 주로 저주파영역에서 밖에 사용할 수 없는 한계점을 가지고 있다. 한편 NiZn계 페라이트는 300 MHz 이상의 고주파영역에서도 효과적으로 사용할 수 있으나 가격이 MnZn계 페라이트보다 10배 정도 비싼 결점을 가지고 있다. 특히, 전파흡수체로 사용할 경우 MnZn계는 흡수대역이 상대적으로 좁은 문제점이 있다.MnZn-based ferrites have a high super-permeability and low relaxation frequency, so they have a limitation that they can be used mainly in the low frequency region when used as electromagnetic materials. On the other hand, NiZn-based ferrites can be effectively used in the high frequency region of 300 MHz or more, but the defects are about 10 times more expensive than MnZn-based ferrites. In particular, the MnZn system has a relatively narrow absorption band when used as a radio wave absorber.

전파암실용 전파흡수체의 규격은 크게 전자파흡수대역과 전자파흡수능으로 나누어진다. CISPR11에서 1998년 발표한 상기의 규제범위는 30 MHz - 18 GHz 대역에서 20 dB 이상의 전자파흡수능을 가지는 것이다. 따라서, 본 발명의 기술적 과제는 30 MHz - 20 GHz 이상의 대역에서 20 dB 이상의 전자파흡수능을 만족시키는 광대역 전파흡수체를 저렴하고 용이하게 구현하는 것이다.The specifications of the radio absorber for the radio darkroom are largely divided into the electromagnetic wave absorption band and the electromagnetic wave absorption capability. The above regulatory range, published in CISPR11 in 1998, has electromagnetic absorption above 20 dB in the 30 MHz to 18 GHz band. Therefore, the technical problem of the present invention is to implement a broadband radio absorber that satisfies the electromagnetic wave absorption capacity of 20 dB or more in the band of 30 MHz-20 GHz or more inexpensively and easily.

제 1 도는 본 발명의 전파흡수체 실시예의 사시도1 is a perspective view of a radio wave absorber embodiment of the present invention

제 2 도는 본 발명의 전파흡수특성의 비교도2 is a comparison of radio wave absorption characteristics of the present invention.

NiZn계 페라이트는 초투자율이 낮고 완화주파수가 높아 고주파 특성이 좋으며, 광대역에 걸쳐 전파흡수능이 MnZn보다 뛰어나지만 가격이 고가이어서 경제적인 면에서 경쟁력을 확보할 수 없다. 그러나, 가격이 NiZn계의 10분의 1 정도인 MnZn계 페라이트에 NC를 첨가 고온 처리한 고성능의 페라이트를 활용한 전파흡수체를 제작하면 상기한 문제점은 해결할 수 있다.NiZn-based ferrites have high ultra-low permeability and high relaxation frequency, so they have good high-frequency characteristics, and the radio absorption ability is superior to MnZn over broadband, but the price is high, so economic competitiveness cannot be secured. However, the above-mentioned problems can be solved by fabricating a radio wave absorber using high-performance ferrite, which is a high-temperature treatment of NC by adding NC to MnZn-based ferrite whose price is about one tenth of that of NiZn-based.

제 1 도는 본 발명의 전파흡수체 구성 예를 나타내고 있으며, 제 2 도는 본 발명의 전파흡수특성을 순수 MnZn계 페라이트 전파흡수체의 특성과 비교하여 나타내었다.FIG. 1 shows an example of the structure of the radio wave absorber of the present invention, and FIG. 2 shows the radio wave absorption characteristics of the present invention compared with that of pure MnZn ferrite wave absorbers.

또한 NiZn계 페라이트에도 NC를 첨가 고온 처리하여 고성능의 대체 페라이트로 전파암실용 전파흡수체를 비롯하여 EMI 대책용 파워코드 및 필터용 비더, TV의 고스트 방지대책 및 레이다파흡수체, 나아가 전자렌지 (Microwave Oven)나 각종 OA기기로부터 누설되는 전파 억제용 흡수체를 저가로 만들수 있는 장점이 있다.In addition, NiZn-based ferrite is a high-performance alternative ferrite, which is a high-performance alternative ferrite for radio darkroom radio absorber, EMI countermeasure power cord and filter bead, TV anti-ghost protection and radar wave absorber, and microwave oven (Microwave Oven) In addition, there is an advantage that the absorber for suppressing radio waves leaking from various OA devices can be made at low cost.

본 발명에 의한 전파흡수체는 국내는 물론 세계적으로도 경쟁력이 높은 성능을 가지고 있다. 따라서, 전파암실용 전파흡수체 시장에서 국내는 물론 세계시장에서도 우위를 선점할 수 있을 것이다. 또한, 제조원가 측면에서도 획기적인 원가절감 효과를 얻을 수 있다.The radio wave absorber according to the present invention has a competitive performance both domestically and globally. Therefore, in the radio wave absorber market for radio darkrooms, it will be able to preoccupy an advantage not only in Korea but also in the world market. In addition, it is possible to obtain a significant cost reduction effect in terms of manufacturing costs.

Claims

A tile-type ferrite magnetic material is placed on the reflecting plate, and a cone-cut column is placed thereon to have a two-layer structure as a whole. The period a of the ferrite array is 20 mm, and the diameter b of the two-layer upper side of the conical ferrite is 8 mm. <b ≤ 15 mm, diameter d on the bottom of the second floor is 15 mm ≤ d <20 mm, height h1 of the first layer is 4 mm ≤ h1 ≤ 8 mm, height h2 of the second layer is 20 mm ≤ h2 ≤ 65 mm , h3 is 0.5 mm ≤ h2 ≤ 5 mm, characterized in that the alternative ferrite made by high-temperature treatment at 1100-1250 ℃ with the composition ratio of MnZn-based ferrite [90-99.9 wt%] and NC [0.1-20 wt%] Broadband ferrite absorber.

The ferrite radio wave absorber according to claim 1, wherein an alternative ferrite made by high-temperature treatment at 1100-1250 ° C is used in a composition ratio of NiZn ferrite [95-99.9 wt%] and NC [0.1-5 wt%].

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