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ABSTRACT
A frequency and polarization reconfigurable patch antenna is proposed in this letter. The antenna consists of a circular patch surrounded by four sector-shaped patches. Four pairs of varactor diodes are introduced to bridge the gaps between the circular patch and the sector-shaped patches; the capacitance of the varactors is controlled by two DC signals. By adjusting the reverse bias voltage of the varactors, the proposed antenna can switch between linear polarization (LP), right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP). Furthermore, the operating frequency of each polarization state can be independently tuned. A prototype has been designed and fabricated. The results indicate the proposed antenna with a continuously tunable frequency range from 1.82 to 2.28 GHz in LP states, and from 1.88 to 2.25 GHz in either RHCP or LHCP states. Meanwhile, stable radiation patterns with low cross-polarization and back radiation levels (<−15 dB) are achieved for all states.
Additional information
Notes on contributors
Hui Gu
Hui Gu was born in Jiangsu, China. He received the M.S. degree in Communication and Information System from Nanjing University of Science and Technology, Nanjing, China, in 2016. He is currently pursuing the PhD degree in information and communication engineering, Shenzhen University, Shenzhen, China. His recent research interest focuses on wideband antenna, patch antennas, base station antennas, reconfigurable antennas and the antennas for cognitive radio.
Jianpeng Wang
Jianpeng Wang received the PhD degree from the University of Electronic Science and Technology of China (UESTC), Chengdu, China, in 2007. From 2005 to 2006, he was a Research Assistant with the Institute for Infocomm Research, Singapore. From 2010 to 2011, he was a Research Fellow with the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore. From October 2013 to December 2013, he was a Visiting Scholar with the School of Engineering and Physical Sciences, Heriot Watt University, Edinburgh, UK. From July 2014 to October 2014 and March 2016 to August 2016, he has been a Research Fellow with the Faculty of Science and Technology, University of Macau, Macau, China. He is presently an Associate Professor with the School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, China. He has authored or coauthored more than 60 papers in international journals and conference proceedings. His research interests include microwave circuits, antennas, and low-temperature co-fired ceramic (LTCC)-based millimeter-wave circuits. Dr Wang is the Associate Editor for the IET Electronics Letters (2015–present).
Lei Ge
Lei Ge (S'11–M'15) was born in Jiangsu, China. He received the BS degree in Electronic Engineering from Nanjing University of Science and Technology, Nanjing, China, in 2009 and the PhD degree in electronic engineering from City University of Hong Kong, Hong Kong, in 2015. From September 2010 to July 2011, he was a Research Assistant with the City University of Hong Kong. From April 2015 to October 2015, he was a Postdoctoral Research Fellow at the State Key Laboratory of Millimeter Waves, City University of Hong Kong. He is currently Assistant Professor and Associate Head of the Department of Electronic Engineering at Shenzhen University, China. He received the Honorable Mention at the student contest of 2012 IEEE APS-URSI Conference and Exhibition held in Chicago, US. He won the First Prize in the Student Innovation Competition of 2014 IEEE International Workshop on Electromagnetics (IEEE iWEM) held in Sapporo, Japan, in 2014. He was the TPC Member of the APCAP 2016. He was a recipient of the IEEE Antennas and Propagation Society Top 10 Outstanding Reviewer Award from 2017 to 2018. His recent research interest focuses on wideband antennas, patch antennas, base station antennas, reconfigurable antennas, millimeter-wave antennas, and filtering antennas.
Lijie Xu
Lijie Xu was born in Jiangyin, Jiangsu, China, in 1987. She received the BS and PhD degree from the Department of Electronic Science & Technology, Nanjing University of Science and Technology (NUST), Nanjing, China in 2009 and 2014, respectively. She is currently a lecturer at Nanjing University of Posts and Telecommunications (NJUPT), China. From December 2010 to June 2011, she was a visiting scholar with the Department of Electrical and Computer Engineering, National University of Singapore, Singapore and then became a joint PhD student supported by China Scholarship Council (CSC) and National University of Singapore from September 2011 to August 2013. Her main research interests include implantable antennas for biomedical applications, low-pass and band-pass filters.