KR20030039096A

KR20030039096A - Broad-Band Electromagnetic Wave Absorber by NC-added Rubber Ferrite

Info

Publication number: KR20030039096A
Application number: KR1020010070016A
Authority: KR
Inventors: 김동일; 이장우; 송재만; 배재영; 구동우
Original assignee: 김동일
Priority date: 2001-11-12
Filing date: 2001-11-12
Publication date: 2003-05-17
Also published as: KR100455342B1

Abstract

PURPOSE: A broadband radio absorptive material using a rubber-natural ceramic ferrite is provided to improve the property of radio absorption by using a natural ceramic ferrite. CONSTITUTION: A natural ceramic is made of SiO2 of 79.7wt%, Al2O3 of 9.87wt%, Fe2O3 of 0.21wt%, K3O of 3.79wt.%, Na2O of 2.8wt%, CaO of 1.59wt%, MgO of 0.86wt%, and Ge of 0.5-2ppm. A rubber-natural ceramic ferrite is made of a mixture of the natural ceramic and a ferrite, and a hold-back agent with a ratio of (30-80)wt%:(70-20)wt%. The rubber-natural ceramic ferrite has the superior property of radio absorption of 11dB(decibel) in a frequency range of 500MHz to 2GHz. The ferrite mixed with the natural ceramic includes a NiZn ferrite and a MnZn ferrite.

Description

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

일반적으로 성능이 우수한 전파흡수체라는 것은 두께가 얇고 광대역에서 높은 전파흡수능을 가지는 것이다. 그러나 기존의 고무페라이트는 500 MHz 이상의 주파수 영역에서 반사감쇠량이 낮아 이들을 사용하여 레이더파, 휴대전화, 각종 전자기기로 부터의 방사전자파를 흡수하고자 하는 경우, 요구되는 전파흡수능을 만족시키기 어려우며, 특히 두께가 두꺼워 지거나 가격이 비싸지는 등의 제약이 크다.In general, the excellent radio wave absorber is thin and has a high radio wave absorption capacity in a wide band. However, the conventional rubber ferrite has a low reflection attenuation in the frequency range of 500 MHz or more, so that it is difficult to satisfy the required radio wave absorption ability when absorbing radiated electromagnetic waves from radar waves, mobile phones, and various electronic devices. There are big constraints such as thickening and expensive price.

[도 1]에서 알 수 있는 바와 같이, 기존의 고무페라이트 전파흡수체는 500 MHz∼5 GHz의 주파수 대역에서 2∼6 dB 정도의 매우 낮은 반사감쇠량을 가지므로, 본 발명의 기술적 과제는 차세대 재료인 심성화강암(NC ; Natural Ceramics, 주성분 : SiO₂79.7 wt%, Al₂O₃9.87wt%, Fe₂O₃0.21 wt%, K₂O 3.79 wt%, Na₂O 2.8 wt%,CaO 1.59 wt%, MgO 0.86 wt%, Ge 0.5-2 ppm)과 페라이트를 최적의 비율로 보지재 B(고무, CPE, PVC 등의 수지)를 (NC+페라이트):B=(30∼80)wt%:(70∼20)wt%로 배합하여 얻어지는 고무-NC페라이트 전파흡수체에 관한 것으로서, 이들은 기존의 고무페라이트(페라이트:고무=70wt%:30wt%)에 비해 특히 500 MHz∼2 GHz의 주파수 범위에서 11 dB이상의 매우 우수한 전파흡수특성을 가지도록 전파흡수체를 제작하는 것이다.As can be seen in Figure 1, the conventional rubber ferrite absorber has a very low reflection attenuation of about 2 to 6 dB in the frequency band of 500 MHz to 5 GHz, the technical problem of the present invention is Deep granite (NC; Natural Ceramics, main component: SiO ₂ 79.7 wt%, Al ₂ O ₃ 9.87wt%, Fe ₂ O ₃ 0.21 wt%, K ₂ O 3.79 wt%, Na ₂ O 2.8 wt%, CaO 1.59 wt% , MgO 0.86 wt%, Ge 0.5-2 ppm) and ferrite in an optimal ratio to the holding material B (resin such as rubber, CPE, PVC) (NC + ferrite): B = (30 to 80) wt%: (70 Rubber-NC ferrite absorber obtained by compounding at -20) wt%, which is 11 dB or more in the frequency range of 500 MHz to 2 GHz, compared to conventional rubber ferrite (ferrite: rubber = 70 wt%: 30 wt%) It is to produce a radio wave absorber to have a very good radio wave absorption characteristics.

제 1 도는 본 발명의 전파흡수특성 비교도.1 is a comparison diagram of radio wave absorption characteristics of the present invention.

기존의 고무페라이트는 500 MHz∼5 GHz의 주파수 영역에서 반사감쇠량이 매우 낮아 이들을 사용하여 레이다, 휴대전화, 각종 전자기기로부터의 방사 전자파를 흡수하기 위한 전파흡수체를 활용할 경우 국제 규격을 만족시키기가 어렵고, 반사감쇠량을 높이기 위해서는 전파흡수체의 두께가 늘어나는 등의 단점을 가지고 있다. 따라서 상기의 문제점들을 해결하기 위해서 기존의 고무페라이트와는 달리 NiZn 페라이트 또는 MnZn 페라이트에 NC를 첨가한 NC페라이트를 보지재에 혼입하여 전파흡수체를 제작함으로써 기존의 고무페라이트보다 11 dB 이상의 전파흡수능을 개선하는 것이다.Existing rubber ferrites have very low reflection attenuation in the frequency range of 500 MHz to 5 GHz, which makes it difficult to meet international standards when using radio absorbers to absorb radiated electromagnetic waves from radars, mobile phones, and various electronic devices. In order to increase the reflection attenuation, the thickness of the radio wave absorber is increased. Therefore, in order to solve the above problems, unlike the conventional rubber ferrite, by mixing the NCZ ferrite or NC ferrite added NC to MnZn ferrite into the holding material to produce a radio wave absorber improves the radio absorption ability of 11 dB or more than the conventional rubber ferrite It is.

(실시예)(Example)

MnZn 페라이트와 NC를 3 wt%:97 wt%로 합성하여 1150℃에서 2.5시간 반응시켜 제조된 NC페라이트(NCF)와 PVC를 NCF:PVC=70 wt%:30 wt%로 제작하여 얻어진 전파흡수체(고무NC페라이트)는 [도 1]의 실선과 같이 우수한 특성을 나타내었으며, 한편 기존의 고무페라이트(RF)를 3 mm의 두께로 RF:PVC=70 wt%:30 wt%로 제작한 경우의 전파흡수체는 [도 1]의 파선과 같이 열악한 전파흡수특성을 나타내었다.MnZn ferrite and NC were synthesized at 3 wt%: 97 wt%, and the result was obtained by producing NC ferrite (NCF) and PVC produced by NCF: PVC = 70 wt%: 30 wt%. Rubber NC ferrite) exhibited excellent characteristics as shown in the solid line of FIG. 1, while conventional rubber ferrite (RF) was produced at a thickness of 3 mm with RF: PVC = 70 wt%: 30 wt%. The absorber exhibited poor radio wave absorption characteristics as shown by the broken line in FIG. 1.

본 발명에 의한 전파흡수체를 사용하여 전파무향실을 구성하였을 경우, 기존의 고무페라이트 보다 높은 전파흡수능을 가지며, 전파무향실의 유효공간 확장에도 매우 유리한 이점을 가지게 된다.When the radio wave anechoic chamber is configured using the radio wave absorber according to the present invention, it has a radio wave absorption capability higher than that of a conventional rubber ferrite, and has a very advantageous advantage in the effective space expansion of the radio wave anechoic chamber.

Claims

The radio wave absorber of the present invention is a broadband high-performance radio wave absorber prepared by mixing NC holding MnZn ferrite (NCF) with a holding material (B) in a ratio of NCF: B = (30 to 80) wt%: (70 to 20) wt%. .

The broadband high-performance radio wave absorber using NiZn ferrite in place of NC-added MnZn ferrite according to claim 1.