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김동일(Dong Il Kim),최동한(Dong Han Choi),구동우(Dong Woo Ku),김도연(Do Yearn Kim),옥승민(Seung Min Ok),양은정(Eun Jung Yang),김보영(Bo Young Kim) 한국항해항만학회 2002 한국항해항만학회 학술대회논문집 Vol.1 No.-
In this paper, we explain new EM(electromagnetic) wave absorber that mixed NC(Natural Ceramics) and Ferrite with NL(Natural Lacquer). At first, a mixed NC and Ferrite(NC : F = (0.1~30)wt% : (99.9~70)wt%) burn at 950˚~1250˚C. And then, it is comminuted and injected into NL((NC+F) : NL = (30~80)wt% : (70~20)wt%), finally we made Ferrite-NL EM wave absorber. Generally, conventional labor Ferrite covers only 500 MHz to 10 GHz under tolerance limits of 2 to 6 dB in absorption, and Ferrite-NL is over 8~14 dB. However, NCFerrite-NL has superior absorption ability. It is over 16 ro 19 dB through 500 MHz to 10 GHz.
김동일,구동우,양은정,김도연,예병덕,Kim, Dong-Il,Ku, Dong-Woo,Yang, Eun-Jung,Kim, Do-Yearn,Yea, Byeong-Dok 한국항해항만학회 2002 한국항해항만학회지 Vol.26 No.5
제안된 EMC 필터는 높은 투자율의 페라이트 비드와 관통형 콘덴서로 구성하여 제작하였고, 10 MHz ~ 1.5 GHz에서 전원선에서 광대역 노이즈 신호에 대한 EMC 요구를 만족시킨다. 최적의 필터를 설계하기 위하여 페라이트 비드의 임피던스를 계산하여 찾았다. 그 결과, 광대역 EMC 필터는 차동모드 노이즈와 공통모드 노이즈에 대해 10 MHz ~ 1.5 GHz대역에서 30 dB 이상의 필터 특성을제안된 EMC 필터는 높은 투자율의 페라이트 비드와 관통형 콘덴서로 구성하여 제작하였고, 10 MHz ~ 1.5 GHz에서 전원선에서 광대역 노이즈 신호에 대한 EMC 요구를 만족시킨다. 최적의 필터를 설계하기 위하여 페라이트 비드의 임피던스를 계산하여 찾았다. 그 결과, 광대역 EMC 필터는 차동모드 노이즈와 공통모드 노이즈에 대해 10 MHz ~ 1.5 GHz대역에서 30 dB 이상의 필터 특성을 나타내었다. 그리고, DC ~ 1.8 GHz 주파수 대역에서 10 ~ 30 dB이상의 내성 특성을 향상시켰다. 나타내었다. 그리고, DC ~ 1.8 GHz 주파수 대역에서 10 ~ 30 dB이상의 내성 특성을 향상시켰다. The proposed EMC filter composed with feed-through capacitors and ferrite beads of high permeability was prepared which satisfy the EMC standard for a wide-band noise signal in the frequence of 10 MHz to 1.5 GHz in power supply line. The optimum structure of ferrite bead was found by calculating the load effect of ferrite beads. As a result, the filter showed excellent differential- and common-mode noises filtering characteristics above 30dB in the frequency band from 10 MHz to 1.5 GHz. The immunity characteristics are improved more than 10 to 30 dB over the frequency band from DC to 1.8GHz.
김동일,배재영,손준영,구동우 한국해양대학교 산업기술연구소 2002 연구논문집 Vol.19 No.-
Along with the increase of demand of radio communications and with the rapid progress of communication systems, the radio frequency interference of neighbor nations is a matter of argue. This problem is a delicate matter which must be dealt diplomatically with by having a distinct technical back ground. After the radio interference has been experienced in the Korean TRS service on the south seashore due to the base stations including the Fukuoka station in Japan, the radio interference problem between neighbor nations has become the matter of conflict. For the purpose to solve this problem. We have measured the radio waves that come from Fukuoka in Japan mainly to Pusan in Korea and also collected data in real-time.
김동일,구동우,손준영,배재영,송재만 한국해양대학교 산업기술연구소 2002 연구논문집 Vol.19 No.-
As electronic industry and radio communication technologies progress. mankind enjoys its abundant life. On the other hand, it becomes possible that the electrical and electronic equipments are on light weight, small size, high speed, broad bandwidth, and operation by small energy. At the same time, many social problems like EMI/EMS by electromagnetic waves occur. Therefore, the organizations such as CISPR, FCC, ANCI, etc., have provided the standards of electromagnetic wave environments for the countermeasure of the EMC. In this paper, we designed and studied a new EMI filter for multi-tap in the frequency band from 150 kHz to 30 MHz.