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Abstract
This paper presents some multi-function microwave components based on implantable filters. It is found that some bandpass filters (BPFs) have the properties of ±K-inverters, meaning that they can be utilised to replace 90° or 270° transmission lines in passive microwave components such as in-phase and out-of-phase power dividers and rat-race couplers to realise both filtering and power-splitting functions. The ±K-inverter properties also mean that the proposed filters can be employed as impedance transformers in output-matching networks (OMNs) of power amplifiers for efficiency improvement and harmonic suppression. As a demonstration, some power combining and dividing components and power amplifiers are implemented based on the implantable filters, which exhibit dual functions, good performance and compact size.
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Notes on contributors
Xiu Yin Zhang
Prof Xiu Yin Zhang received his M.Sc. degree in Electronic Engineering from the South China University of Technology in 2006 and his Ph.D. degree in Electronic Engineering from the City University of Hong Kong (CityU) in 2009.
From 2001 to 2003, he was with ZTE Corporation. He was a Research Assistant from July 2006 to June 2007, and a Research Fellow from September 2009 to February 2010 at the CityU. He is currently a Professor of the School of Electronic and Information Engineering at the South China University of Technology. He has authored and co-authored over 100 international journal and conference papers. His research interests include microwave circuits and antennas, LTCC, wireless power transfer.
Prof Zhang has served as a Technical Programme Committee Member and a Session Organiser/Chair for a number of conferences. He has been a regular reviewer of several international journals, including six IEEE Transactions and two IEEE Letters. He has been a recipient of the Top-Notch Young Talents Programme of China, the National Science Foundation for Outstanding Young Scholars of China and the Guangdong Natural Science Fund for Distinguished Young Scholars. He was the supervisor of several best paper conference award winners.
Kai Xu Wang
Mr Kai Xu Wang received his B.Sc. and M.Sc. degrees in Information Engineering from the South China University of Technology in 2012 and 2015, respectively and is currently working towards his Ph.D. degree in Electronic Engineering at the CityU. His current research interests include microwave RF circuits and antennas.
Yuan Chun Li
Dr Yuan Chun Li received her B.Sc. degree in Electronic Engineering from Anhui University in 2006, M.Sc. degree in Electronic Engineering from the University of Science and Technology of China in 2009, and Ph.D. degree in Electronic Engineering from the CityU. From October 2012 to June 2015, she was a Research Fellow of the CityU. She is currently an Associate Professor of the School of Electronic and Information Engineering at the South China University of Technology. Her research interests include RF and microwave passive and active circuits and monolithic microwave integrated circuits.
Li Gao
Mr Li Gao received his B.Sc. and M.Sc. degrees in Electronic Engineering from the South China University of Technology in 2012 and 2015, respectively. He is currently working to obtain his Ph.D. degree in the Department of Electrical and Computer Engineering at the University of California San Diego (UCSD), the USA. His research interests include RF circuits and antennas.
Xiao Feng Liu
Mr Xiao Feng Liu received his B.Sc. degree from the South China University of Technology in 2013 and is currently working to obtain his M.Sc. degree in the School of Electronic and Information Engineering at the South China University of Technology. His research interests include RF circuits and microwave passive components.