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Abstract
A vertical microstrip-to-microstrip transition with ultra-wideband (UWB) filtering response is proposed and constituted based on the highpass or UWB bandpass filtering structure with the composite series or shunt stubs. By centrally feeding a slotline resonator on the common ground, two microstrip feed lines in the top and bottom layers are interconnected to make up a three-pole signal transmission network. Based on the ideal transmission-line model, this proposed transition is at first synthesised with the Chebyshev equal-ripple frequency responses. Next, the transition is formed on a two-layered dielectric substrate and its frequency response is simulated via the commercial electromagnetic simulator to confirm the predicted three-pole transmission behaviour from the synthesis approach. Finally, a prototype vertical transition centred at 6.0 GHz is fabricated and measured, showing the good agreement among predicted, simulated and measured results over a wide frequency band.
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Notes on contributors
Li Yang
Mr Li Yang received his M.Sc. degree in Electrical and Electronics Engineering from the University of Macau (UM) in 2013. He is currently working toward his Ph.D. degree in Electrical and Computer Engineering at the UM. His research interests include the synthesis and design of RF/microwave planar and multilayered components. He was the recipient of the Best Student Paper Award at the International Symposium on Antennas and Propagation 2010.
Lei Zhu
Prof Lei Zhu received his BEng and MEng degrees in Radio Engineering from the Nanjing Institute of Technology in 1985 and 1988, respectively, and his Ph.D. degree in Electronic Engineering from the University of Electro-Communications, Tokyo, Japan in 1993. From 1993 to 1996, he was a Research Engineer of the Matsushita-Kotobuki Electronics Industries Ltd., Tokyo, Japan. From 1996 to 2000, he was a Research Fellow with the École Polytechnique de Montréal, Quebec, Canada. From 2000 to 2013, he was an Associate Professor with the School of Electrical and Electronic Engineering, the Nanyang Technological University, Singapore. Since August 2013, he has been a Professor of the Faculty of Science and Technology, the UM. Since September 2014, he has also been serving as the Head of the Department of Electrical and Computer Engineering at the UM. He has authored and co-authored over 260 papers in peer-reviewed journals and conference proceedings. His papers have been cited more than 3200 times with the H-index of 31 (source: ISI Web of Science). His research interests include microwave circuits, guided-wave periodic structures, antennas, and computational electromagnetic techniques.
Wai-Wa Choi
Dr Wai-Wa Choi received his B.Sc., M.Sc. and Ph.D. degrees in Electrical and Electronics Engineering from the UM in 1993, 1997, and 2008, respectively.
From 1993 to 1995, he was a Research Assistant at the Institute of Systems and Computer Engineering (INESC), Lisbon, Portugal. Since 1995, he has been with the UM, where he is currently an Assistant Professor in the Department of Electrical and Computer Engineering. He has authored and co-authored over 40 internationally refereed journal and conference papers. His research interests are in the areas of microwave active and passive circuits, smart antennas and radar and radio frequency identification (RFID) systems. He was also the Chair of the IEEE Macau AP/MTT Joint Chapter in 2015.
Kam-Weng Tam
Prof Kam-Weng Tam received his B.Sc. degree and joint Ph.D. degree in Electrical and Electronics Engineering from the UM in 1993 and the Instituto Superior Técnico (IST), Technical University of Lisbon, Portugal in 2000, respectively. From 1993 to 1996, he was with the Instituto de Engenharia de Sistemas e Computadores (INESC), Lisbon, Portugal where he participated in research and development on a broad range of applied microwave technologies for satellite communication systems. From July 2000 to December 2001, he was the Director of the INESC in Macau. In 2001, he cofounded the microelectronic design house Chipidea Microelectrónica in Macau, where he was the General Manager until 2003. Since 1996, he has been with the UM, where he is currently a Professor and the Associate Dean (Research and Graduate Studies) of the Faculty of Science and Technology. He has authored and co-authored over 100 journal and conference papers. His research interests include multifunctional microwave circuits, RFID, UWB for material analysis and terahertz technology.