学　术

　　由电子科学与工程学院主办的“电子论坛”第53期邀请到IETE(India) Fellow、IEEE Life Senior Member、南洋理工大学Sheel Aditya教授与我校师生共同探讨新型平面螺旋线行波管的微细加工。具体安排如下，欢迎感兴趣的师生参加。

　　主　题：Planar helix- A novel slow-wave structure for microfabricated TWTs　　

　　主讲人：Prof.Sheel Aditya （ IETE(India) Fellow，IEEE Life Senior Member）

　　时　间：2018年12月11日（周二）9:30-10:30

　　地　点：沙河校区逸夫楼521会议室

　　内容简介：

　　The most common slow-wave structure in travelling-wave tubes is the circular helix because of its un-matched capability for strong electron-wave interaction over large bandwidths. However, the circular helix is not amenable to fabrication using printed-circuit or microfabrication techniques. Microfabrication techniques are very important for extending the operating frequencies of vacuum electron devices to millimetre-wave and higher frequencies. Planar helix is a novel slow-wave structure which retains the broadband properties of the circular helix and is amenable to fabrication using printed-circuit or microfabrication techniques. This presentation will describe the evolution of the planar helix structure, the techniques used for its analysis, and the attempts made to fabricate the structure using both the printed-circuit and microfabrication techniques. Design results will be presented for TWT amplifiers and Backward-Wave Oscillator at Ka and W bands incorporating the planar helix slow-wave structure.

　　主讲人简介：

　　Sheel Aditya received the B.Tech. and Ph.D. degrees in electrical engineering from the Indian Institute of Technology (IIT) Delhi, India, in 1974 and 1979, respectively. From 1979 to 2001, he held academic positions ranging from Lecturer to Professor in the Department of Electrical Engineering, IIT Delhi. Since 2001, he has been an Associate Professor with the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore.

　　Dr. Aditya has been teaching courses in the area of Electromagnetics and RF Engineering since the beginning of his career. He won the Year 3 Teaching Excellence Award in 2012 in the School of EEE, Nanyang Technological University. He has published more than 260 journal and conference papers, on the topics of planar microwave waveguides and antennas, integrated optics, microwave photonics, optical fiber communication, and microfabricated RF vacuum electron devices. He has been involved in a number of research and development projects and is the co-holder of five patents in India, Singapore, and USA.

　　Dr. Aditya has held visiting assignments at Chalmers University of Technology, Sweden; Indian Institute of Science, India; Florida State University, USA; and Nanyang Technological University, Singapore. He has been an Editor (Electromagnetics) for IETE Journal of Research (India) since 2008 and extensively reviews submissions to IEEE journals. He was the General Chair of ICICS 2011 (International Conference on Information, Communications, and Signal Processing, December 2011, Singapore).

　　He is a Fellow of IETE (India) and a Life Senior Member of IEEE.

　　　　　　　　　　　　　　　　　　　　　　　　　电子科学与工程学院

　　　　　　　　　　　　　　　　　　　　　　　　　　2018年12月10日