2015-09-14
浏览次数：263
报告题目：On how the development of active harmonic load-pull is driving the development of RFPAs
时间：2015年9月17日（星期四）上午10：30-12：00
地点：逸夫科学馆107室
报告人：Prof.Johannes Benedikt卡迪夫大学电子电气工程教授，高频中心研究经理
报告摘要：
The development of efficient RFPA designs has been often evaluated through employment of active harmonic load-pull, which allow to emulate suitable input and output matching network during the design of RFPAs. However, it has been far more than just a verification tool for confirming theoretical PA concepts. It was actually the insight obtained from searching ideal PA modes of operation within a real power device that triggered new ideas and concepts such as the new continuous class-J, class-F or the harmonic injection PA modes. The presentation will provide an overview of active load-pull systems, how its application stimulated new research on RFPAs and explore some new developments in this field.
报告人简介
Johannes Benedikt received the Dipl.-Ing. Degree in electrical engineering from the University of Ulm, Germany in 1997 and shortly after he started a PhD course at Cardiff University. During his PhD project he developed a £0.5M research project with Nokia on RF power amplifiers and took on the position of senior research associate at Cardiff University starting at October 2000. He was awarded a PhD degree in 2002 and was appointed as a Lecturer in 2004 and a Senior Lecturer from August 2009. Following his success in research and engagement activities with industry he was awarded a personal chair in May 2010.
His teaching tasks comprise mainly third and fourth year modules on Communication Systems and their development to reflect the rapid changes in this area.
His research responsibilities include the management of the High Frequency Laboratory at the School of Engineering resulting in strong participation from industry. He is also actively promoting the measurement capabilities of the research lab as a service for industry, attracting several national and international companies. This activity has been recently awarded £0.4M from the Welsh Assembly Government (A4B) as part of the The Knowledge Transfer Center: Green Communications.
His research interests are focused on large-signal measurement systems at RF and high frequencies, large-signal device characterisation including novel active harmonic source- & load-pull systems, and the development of efficient and linear high power amplifiers for the mobile telecommunication sector. Since 2000 he has been involved in the development of a number of time-domain characterisation and active harmonic load pull systems.
He has a strong industrial background which he acquired in the last 10 years working together with DaimlerChrysler, Siemens, Robert Bosch, Nokia, Agilent, and Tektronix. His industrial involvement and inventiveness is underlined by three internationally granted patents, all submitted during his work with Cardiff University.
Since April 2009 he took on in addition the position of a CTO at Mesuro Ltd, leading the commercial introduction of new measurement solutions that enable systematic waveform engineering at RF and microwave frequencies.