学术报告:Planar Helix-based Slow Wave Structure for Millimeter Wave Traveling-Wave Tubes

 

   发布日期:2016-10-28  浏览次数:745

 

报告题目:Planar Helix-based Slow Wave Structure for Millimeter Wave Traveling-Wave Tubes

主讲人:DrChen Zhao

时间:2016114日(周五)14:30-16:00

地点:仙林校区电子学科楼二楼223会议室

主办单位:电子科学与工程学院


讲座简介:Circular helix is a very popular slow-wave structure (SWS) for application in traveling-wave tubes (TWTs). But it is not easy to be fabricated using printed-circuit or microfabrication techniques which are important for low-cost fabrication and high frequency applications. In this context, during the last few years, a planar helix SWS with straight-edge connections (PH-SEC) has been proposed and studied. Unlike the circular helix, the PH-SEC is suitable to be fabricated using printed circuit or microfabrication techniques. However, there are still some issues and problems that need to be addressed for the PH-SEC when used in millimeter wave TWTs. First of all, there can be backward wave oscillations when the TWT is working at high voltages. Secondly, the size of the SWS, the electron beam tunnel, and the beam get very small, causing difficulty in fabrication, alignment, and focusing of the electron beam. Thirdly, at millimeter wave frequencies, it is more likely that the electrons hit the supporting dielectric, causing dielectric charging which will affect the performance of the TWT adversely. Moreover, PH-SEC can be dispersive in the presence of dielectric loading, reducing the bandwidth of operation. This talk presents novel SWSs which are based on the PH-SEC and solve some of these problems.

主讲人简介:Dr. Chen Zhao received the B. Eng. Degree, from University of Electronic Science and Technology of University, Chengdu, China in 2011 and received the Ph. D. degree at Nanyang Technological University, Singapore in 2016. He has been a research scientist in Temasek lab National University of Singapore since 2015. He was awarded the government research scholarship during his Ph. D. study. His current research interests include planar slow wave structures, miniaturized traveling-wave tubes and functional metamaterials.

 
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