| 报告题目：Graphene Applications from RF/Microwave to THz Frequencies 报告人： 郝阳（Professor Yang Hao） 英国，玛丽女王大学 时 间： 12月29日上午10：00-11：00 地 点： 3412会议室 主 办： 东南大学毫米波国家重点实验室 IEEE AP-MTT-EMC Joint Nanjing Chapter 江苏省电子学会天线与微波专委会 报告人简历：Yang Hao is currently a Professor of antennas and electromagnetics in the Antenna Engineering Group, Queen Mary, University of London. Prior to his appointment at Queen Mary, he was a postdoc research fellow at School of Electronic, Electrical and Computer Engineering, University of Birmingham. Professor Hao currently leads a £4.6M project on transformation electromagnetics and microwave metamaterials. He is also a management board member of Cambridge Graphene Center. Over the years, he developed several fully-integrated antenna solutions based on novel artificial materials to reduce mutual RF interference, weight, cost and system complexity for security, aerospace and healthcare. He developed, with leading UK industries, novel and emergent gradient index materials to reduce mass, footprint and profile of low frequency and broadband antennas. He also co-developed the first stable active non-Foster metamaterial to enhance usability through small antenna size, high directivity, and tuneable operational frequency. He coined the term ‘Body-centric wireless communications’, i.e. networking among wearable and implantable wireless sensors on the human body. He was the first to characterize and include the human body as a communication medium between on-body sensors using surface and creeping waves. He contributed to the industrial development of the first wireless sensors for healthcare monitoring. Professor Hao is a strategic advisory board member for Engineering and Physical Sciences Research Council (EPSRC), where he is committed to championing RF/microwave engineering for reshaping the future of UK manufacturing and electronics. Professor Hao is active in a number of areas, including computational electromagnetics, microwave metamaterials, graphene and nanomicrowaves, antennas and radio propagation for body centric wireless networks, active antennas for millimeter/sub-millimeter applications and photonic integrated antennas. Professor Hao has published over 140 journal papers and he was a co-editor and co-author of the books Antennas and Radio Propagation for Body-Centric Wireless Communications (Boston, MA, USA: Artech House, 2006, 2012), and FDTD Modelling of Metamaterials: Theory and Applications (Boston, MA, USA: Artech House, 2008), respectively. Prof. Hao is currently an Editor-in-Chief of IEEE Antennas and Propagation Letters. He was an Associate Editor of the same journal, IEEE Transactions on Antennas and Propagation during 2008-2013, and also a Co-Guest Editor for the IEEE Transactions on Antennas and Propagation in 2009. Professor Hao is a member of Board of the European School of Antenna Excellence, a member of EU VISTA Cost Action and the Virtual Institute for Artificial Electromagnetic Materials and Metamaterials, Metamorphose VI AISBL. He was a Vice Chairman of the Executive Team of IET Antennas and Propagation Professional Network. Professor Hao has published more than 120 journal papers and served as an invited and keynote speaker, conference General Chair, session chair and short course organizer at many international conferences. He won IET AF Harvey Research Prize in 2016, BAE Chairman’s Silver award in 2014 and is a current holder of the Royal Society Wolfson Research Merit Award. Professor Hao was elected as a Fellow of the ERA Foundation in 2007, Fellow of the IET in 2010 and Fellow of the IEEE in 2013. 内容摘要：The development of transparent radio-frequency electronics has been limited, until recently, by the lack of suitable materials. Naturally thin and transparent graphene may lead to disruptive innovations in such applications. In this talk, I will present some of our recent work on applications of graphene from RF/Microwave to THz frequencies. For example, optically transparent broadband absorbers operating in the millimetre wave regime achieved by stacking graphene bearing quartz substrates on a ground plate will be demonstrated. Broadband absorption is a result of mutually coupled Fabry-Perot resonators represented by each graphene-quartz substrate. An analytical model has been developed to predict the absorption performance and the angular dependence of the absorber. Using a repeated transfer-and-etch process, multilayer graphene was processed to control its surface resistivity. Millimetre wave reflectometer measurements of the stacked graphene-quartz absorbers demonstrated excellent broadband absorption of 90% with a 28% fractional bandwidth from 125�165 GHz. The data suggests that the absorbers' operation can also be extended to microwave bands for effective EM shielding. Extending to THz frequencies, multi-functional devices such as tuneable polariser, Faraday rotator and modulator will be presented. As graphene is an ideal platform for the integration of RF/microwave electronics and electromagnetic devices, graphene based transistors such as GFET can be used to realise non-Foster negative impedance convertors. Its use for broadband high-impedance surfaces and absorbers will be also discussed. | ||
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