한국해양대학교

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電波無響實用 廣大域 페라이트 電波吸收體의 設計 및 製作에 관한 연구

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dc.contributor.author 元榮秀 -
dc.date.accessioned 2017-02-22T06:58:20Z -
dc.date.available 2017-02-22T06:58:20Z -
dc.date.issued 2002 -
dc.date.submitted 56797-10-27 -
dc.identifier.uri http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002174014 ko_KR
dc.identifier.uri http://repository.kmou.ac.kr/handle/2014.oak/10089 -
dc.description.abstract Recently, the use of equipments related to information communication has increased drastically. Since unnecessary electromagnetic waves are radiated from electronic equipments and systems, it is reported that the mall function of the equipments and some fatal damage to human life occur. For the countermeasure to the above, several regulations for the electromagnetic wave interference, have been enacted internationally by CISPR, FCC, ANSI, etc. In the domestic case, the regulations related to the Electromagnetic Interference (EMI) and the Electromagnetic Susceptibility (EMS) have been established and enacted. For measurement of such EMI and EMS, an equivalent, free space from electromagnetic waves are required. As the means of the equivalent space, an anechoic chamber is widely used. The Frequency range for EMI test was from 30MHz to 1GHz. However it was broadband from 1GHz to 18GHz additionally by CISPR 11 on November, 1998. To construct in anechoic chamber for the above purpose, it is needed that the electromagnetic wave absorber has the capability to absorb the EM wave more than 20dB over the frequency band. The ferrite tile in a single layer type has been used, the frequency band of which is about 30MHz ~ 400MHz, with more than 20dB of absorption capability. In the case of a grid type absorber developed by Y. Naito, the frequency range to satisfy the above absorption characteristics is approximately from 30MHz ~ 870MHz. Thus it was not sufficient to satisfy the above condition. Accordingly, in this dissertation, in order to satisfy the above demand, the electromagnetic wave absorbers with wide band characteristics was proposed by controlling shape and dimension. The proposed electromagnetic wave absorber in cutting cone-shaped one is of less than 5cm in thickness. The bandwidth of the proposed absorber is from 30MHz to 6GHz, which was designed by the EMCM and confirmed by simulation and experiments. As a measuring method of the absorption characteristics of the ferrite electromagnetic wave absorber, tapered rectangular coaxial line, was fabricated and used, which has 50Ω adapter with l3/8 in diameter. In addition, the characteristics of the anechoic chamber by the proposed cross-shaped absorber were evaluated be the image method. They were compared with those of the OATS. -
dc.description.tableofcontents 목차 Nomenclature = iv Abbreviations = vi Abstract = vii 제1장 서론 = 1 1.1 연구배경 = 1 1.2 연구 목적 = 3 1.3 연구 방법 = 5 제2장 전파흡수체 설계 이론 = 7 2.1 전파흡수체의 분포정수회로화 = 7 2.1.1 파동방정식(Helmholtz Equation) = 7 2.1.2 분포정수회로화 = 13 2.2 전파흡수체 재료와 측정 = 20 2.2.1 손실재료 = 20 2.2.2 재료의 측정법 = 29 2.3 등가재료정수법에 의한 전파흡수체 해석 = 37 2.3.1 페라이트 전파흡수체의 주파수 분산 특성 = 37 2.3.2 등가재료정수법 = 45 제3장 광대역 페라이트 전파흡수체의 설계 및 특성 = 54 3.1 타일형 및 그리드형 페라이트 전파흡수체 = 54 3.1.1 수직입사(垂直入射) 특성과 ?瑛犢?(斜入射) 특성 = 54 3.1.2 타일형 및 그리드형 전파흡수체 = 64 3.2 십자돌기형 페라이트 전파흡수체 = 66 3.2.1 십자돌기형 페라이트 전파흡수체의 설계 = 66 3.2.2 십자돌기형 페라이트 전파흡수체의 성능평가 = 71 3.3 원추절단형 페라이트 전파흡수체 = 79 3.3.1 원추절단형 페라이트 전파흡수체의 설계 = 79 3.3.2 원추절단형 페라이트 전파흡수체의 성능평가 = 82 제4장 십자돌기형 페라이트 전파흡수체의 전파반무향실(電波半無響室) 특성 평가 = 85 4.1 전파반무향실 이론 = 86 4.1.1 시험장 이론 = 86 4.1.2 상호결합(Mutual Coupling) = 96 4.1.3 하이트 패턴(Height Pattern) = 103 4.2 타일형 및 그리드형 전파흡수체를 적용한 전파반무향실의 특성 = 108 4.2.1 타일형 및 그리드형 전파흡수체의 입사 특성 = 108 4.2.2 시험장 감쇠량 = 109 4.2.3 시험장감쇠량의 계산치와 실측치의 비교 = 119 4.2.4 상호결합을 고려한 시험장감쇠량 = 123 4.2.5 수평편파와 수직편파간의 시험장감쇠량 비교 = 126 4.3 십자돌기형 전파흡수체를 적용한 전파반무향실의 특성 = 129 4.3.1 십자돌기형 페라이트 전파흡수체 특성 = 129 4.3.2 시험장 감쇠량 = 129 4.3.3 타일 및 그리드형과 십자돌기 전파흡수체를 적용한 전파반무향실의 특성 비교 = 138 제5장 전파흡수체의 흡수능 측정 = 139 5.1 동축관에 의한 전파흡수능 측정기법 = 140 5.1.1 전파흡수능 측정기법의 종류 = 140 5.1.2 동축선로의 임피던스 해석 = 144 5.2 테이퍼 구형 동축관 측정시스템 제작과 측정 = 153 5.2.1 구형동축관을 이용한 흡수능 측정시스템의 구성 = 153 5.2.2 구형동축관을 이용한 흡수능 측정 = 161 제6장 결론 = 166 참고문헌 = 168 -
dc.publisher 한국해양대학교 -
dc.title 電波無響實用 廣大域 페라이트 電波吸收體의 設計 및 製作에 관한 연구 -
dc.title.alternative A Study on Design of Ferrite Electromagnetic Wave Absorber with Wide-Band Characteristics for the Use of Anechoic Chamber -
dc.type Thesis -
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전자통신공학과 > Thesis
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