• 전기학회논문지
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• 제59권4호
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• pp.774-778
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• 2010

In this paper, the preliminary EMC analysis process between the Communication, Ocean and Meteorological Satellite (COMS) and the Geostationary Earth Orbit (GEO) launch vehicles in the frequency range is described. The considered launch vehicles are Arian Ⅴ, Sea Launch, Land Launch, Atlas III&Ⅴ, Delta IV, Proton M/breeze M, Soyuz, H II-Aa. The launch vehicle Radiated Susceptibility (RS) specifications have been compared to COMS satellite Radiated Emission (RE) limits. The COMS Radiated Emission (RE) level is determined by calculating the radiated field equal to the quadratic sum of radiated emissions of each equipment switched "ON" during launch. As a result, The RS requirements of Arian V, Atlas III&V and Delta IV lauchers are compliant with COMS RE limits. The negative margins appear between the others launch vehicle RS (Sea Launch, Land Launch, Proton M/Breeze M, Soyuz and H II-A) and COMS RE. Then, if the launchers that have negative margin were chosen by the customer, The EMC tests should be performed at satellite level in order to demonstrate the compatibility with respect to launch vehicles requirements.

• 한국전자파학회논문지
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• 제20권12호
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• pp.1272-1278
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• 2009

본 논문은 신호 전송용 비아가 있는 4층 PCB(Printed Circuit Boards)의 P/G(power/ground)면 사이에서 발생되는 공진을 상쇄시켜 복사성 방사(RE: Radiated Emission) 성능을 개선할 수 있는 기법을 제안하였다. 면간 공진 상쇄를 확인하기 위하여 비아가 있는 4층 PCB에서 신호 전송 선로의 전송 특성, PCB 개방 모서리를 통한 방사(radiation)와 RE 세기를 계산하고, 측정하여 제안된 기법의 타당성을 입증하였다.

• 전기학회논문지
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• 제57권3호
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• pp.439-445
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• 2008

In this paper, the preliminary EMC analysis process between the Communication, Ocean and Meteorological Satellite (COMS) and Geostationary Earth Orbit (GEO) launch vehicles in the frequency range [1MHz-47MHz] is described. The considered launch vehicles are arian V, sea Launch, land Launch, atlas III&V, delta IV, proton M/breeze M, soyuz, HII-A and Angara. The launch vehicle Radiated Emission (RE) specifications have been compared to COMS satellite Radiated Susceptibility (RS) limits. The COMS RS limits are the RS qualification levels of COMS units during launch. As a result, The radiated emission levels of arian V, sea launch, atlas III&V, delta IV, proton M/breeze M, HII-A and angara are compliant with COMS RS limits. The negative margins appear between land launch or soyuz launch vehicle RE and COMS RS. Then, if the land launch or soyuz is chosen by the customer, The tests should be performed at satellite level in order to demonstrate the compatibility with respect to launch vehicles specifications.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1574_1575
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• 2009

This paper investigates the reduction of RE(Radiated Emission) noise in a high power LED module circuit using PWM(Pulse Width Module) switching controller circuit. Poorly designed LED lighting module can experience the RE and CE(Conducted Emission) noise problem. This paper propose the reduction of noise source and improvement of EMI filter design in a high power LED lighting module. The experimental and simulation results showed that reduce the RE noise level effectively.

• 항공우주기술
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• 제8권2호
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• pp.33-40
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• 2009

본 논문에서 [1MHz-47MHz]의 주파수 범위에서의 통신해양기상위성과 정지궤도 발사체와의 예비적인 EMC 해석 과정을 기술한다. 정지궤도용 발사체 최대 복사 방출 한계치와 위성의 최대 복사 감응 한계치와 비교한다. 전자파 호환이 되지 않는 발사체로는 land launch와 소유즈가 있다. 만약에 이 발사체가 선정된다면 위성체 레벨에서 전자파 시험을 통하여 검증하여야 한다.

• Journal of electromagnetic engineering and science
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• 제7권1호
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• pp.7-11
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• 2007

PCB Power-Bus (comprising power/ground planes) impedance and fields are evaluated by an efficient series expansion method that is suggested in this paper. It is used to investigate the structure's radiated emission(RE) levels and find acceptable ways of loading the power/ground planes such as decoupling capcitor(DeCap)s, balanced feeding and slits, in order to reduce the interferences. Also, the calculations and measurements of a proposed geometry are verified by vector fitting as a analysis model to check the behavior of the slit.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2007년도 학술대회
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• pp.31-33
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• 2007

This work presents the simplified mechanism that the microstrip line generates the radiated emission which is one of the measures on the EMI levels. The electric currents on the metallization of the structure are input to the radiation integrals with the Green's functions being derived to consider the stratification of the microstrip. The simulated results suggest the method of the conceptualization on the RE characteristics of the signal trace in the PCB structure.

• 한국항공우주학회지
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• 제48권1호
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• pp.63-72
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• 2020

본 연구에서는 위성용 전장품 보드의 성능 요구조건과 설계 복잡도가 높아지면서 증가되는 노이즈 문제를 최소화하기 위해 전원 건전성(Power Integrity) 및 신호 건전성(Signal Integrity)의 설계 분석이 수행되었고 이를 통해 적용된 설계 개선 내용을 기술하였다. 전원 건전성은 정전류 전압강하(DC IR drop) 해석을 통해 정적 전원의 특성을 분석하였고, 각 전원의 임피던스 해석을 통해 동적 전원의 특성을 분석하여 각 분석 결과를 이용한 설계 개선 방안들이 적용되었다. 신호 건전성 측면에서는 주요 데이터버스 신호에 대한 시간영역 파형 분석과 PCB(Printed Circuit Board) 설계 수정을 통해 노이즈가 개선된 결과를 확인하였다. 또한 설계된 PCB 보드의 전원 층에 대한 공진모드를 분석하여 발생된 공진 영역들에 완화 조치를 적용하였고 조치결과를 시뮬레이션을 통해 확인하였다. 최종적으로 분석을 통해 설계 개선이 적용된 유닛에 대해 수정 전과 후의 EMC(Electro Magnetic Compatibility) RE(Radiated Emission) 노이즈 측정결과를 비교함으로써 방사성 노이즈가 감소되었음을 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.1403-1405
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• 2008

In this paper, the preliminary EMC analysis process between the Communication, Ocean and Meteorological Satellite (COMS) and Geostationary Earth Orbit (GEO) launch vehicles in the frequency range [1MHz-47MHz] is described. The considered launch vehicle is the Arian V. The launch vehicle Radiated Emission (RE) specifications have been compared to COMS satellite Radiated Susceptibility (RS) limits. The COMS RS limits are the RS qualification levels of COMS units during launch. As a result, The radiated emission levels of the Arian V is compliant with COMS RS limits.

• Journal of electromagnetic engineering and science
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• 제1권2호
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• pp.126-130
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• 2001

The performance of a fully anechoic chamber (FAC) for radiated emission (RE) measurements has been evaluated using the normalized site attenuation (NSA). To do this, the antenna factor (AF) of a set consisting of nearly identical antennas has been calibrated at an open area test site (OATS). Appropriate correlation factor (CF) between the chamber and the OATS has been calculated. Results show that the performance of the chamber is fairly good with respect to the ANSI-limit except 41~66 MHz far vertical polarization and near 900 MHz for horizontal polarization.