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华北电力大学“前沿&创新”论坛第328期:IEEE EMC Beijing Chapter:Distinguished Lecturer

【讲座题目】IEEE EMC Beijing ChapterDistinguished Lecturer

1Effective Modeling and Characterization of Lightning Effect on Aircraft Composite

2Common-mode Electromagnetic Noise Mitigation for High Speed Electronics

【讲座时间】20191025日(周五)上午930

【讲座地点】主楼A322

【主讲人】高先科博士

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【主讲人简介】

高先科博士于新加坡国立大学获得博士学位。他曾先后在大学、研究机构和工业届工作30余年,现就职于新加坡A*STARAgency for Science, Technology and Research)高性能计算研究院,担任资深科学家与团队带人,RF工程研究室主任。在国际重要期刊和重要会议上发表论文80多篇,IET专著一章,同时领导和参与了数十个国家和工业研究项目和新产品的开发。高先科博士是IEEE高级会员,URSI会员,并被评为2018-19年度IEEE EMC协会卓越讲师。他是IEEE 电磁兼容学报副主编(客座编辑)。担任2018IEEE电磁兼容(EMC)和亚太电磁兼容(APEMC)联合国际会议、2019IEEE亚太微波会议和2020IEEE 亚太电磁兼容国际会议技术委员会(TPC)主席,并受邀担任多个国际会议与学会的理事职务,在2010-2011年和2016-2017年担任IEEE EMC新加坡分会主席。高先科博士长期担任各种国际期刊和国际会议评审委员会委员,曾获2016APEMC最佳论文奖和2019IEEE EMC协会技术成就奖。其主要研究方向为:电磁兼容,雷电和静电放电,屏蔽与滤波,超材料,无线能量传输,天线,RFID,鲁棒设计与优化技术。

【讲座内容简介】

1Effective Modeling and Characterization of Lightning Effect on Aircraft Composite

The lightning strike on aircraft can induce a very huge amount electric current which would redistribute on the aircraft skin. This could lead to a possible hazard. The extent of damage caused by lightning strike increases with more composite material used in aircraft development nowadays. For instance, carbon fiber reinforced polymer (CFRP) is employed for aircraft fuselage and wing design. Since the lightning phenomenon and its direct redistribution effects are very complex, it is imperative to study the intrinsic characteristics of lightning direct and indirect effects on composite material through theoretical modeling and computational simulation. This is because the experimental labs much difficultly mimic the real lightning phenomenon. Computer modeling study examines the internal electromagnetic performances of different plies of composite materials and understands the physical conditions that may result in delamination or dielectric breakdown at the interface in the composite laminates and between composite and metallic objects. The current-carrying capability of composite is characterized for enhancing the aircraft lightning protection. Another critical concern for composite aircraft is the electromagnetic leakage, which would affect and degrade the electronic equipment and systems in the cabin when electromagnetic field transmits through the composite aircraft skin. The electromagnetic shielding effectiveness is thus addressed and analyzed by extracting the equivalent electromagnetic constitutive parameters of composite.

2Common-mode Electromagnetic Noise Mitigation for High Speed Electronics

Due to the peculiar electromagnetic properties, metamaterial has gained wide attention and also been increasingly applied in electromagnetic compatibility (EMC). In this talk, the metamaterial associated EMC design has been addressed through inhibiting common-mode electromagnetic noise in high speed electronic circuits. By using specific slots etched in ground metallic plane which forms a defected ground structure (DGS), a wideband and compact microstrip filter is developed to mitigate the common-mode noise. The effect of the DGS on the electromagnetic characteristics of the microstrip lines is examined.  It is proved that the common-mode noise can be reduced at least by 15 dB at operational frequency with a broad bandwidth, whilst the differential signal is unaffected. An equivalent circuit model is also built based on the simulation result to understand the filtering behavior. The filter size is comparably small to the operational wavelength. A substrate-filled metallic cavity beneath a conventional DGS is proposed for the application in multiplayer printed circuit boards. Behaving as electromagnetic shielding and absorption for the cavity, the back-radiation from the DGS is effectively reduced, whilst the filtering characteristic of the DGS is retained in the interested frequency band. A robust design optimization technique is subsequently employed to realize optimal filter with robustness property. The DGS based filtering technique can effectively tackle the EMI issue and can be used extensively in microwave filter design.