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ABSTRACT
An integrated 3rd-order pseudocombline bandpass filter with pre-designed second to fundamental harmonic ratio is designed based on 0.25 μm GaAs (Gallium Arsenide) process. λ0/4 microstrip loaded with capacitor is used as the resonator. The second to fundamental harmonic frequency ratio of the resonator is investigated, and the ratio can be controlled by the resonator's capacitor. The coupling coefficients and external quality factor are designed based on coupling matrix. This filter was fabricated with die size of 1050 μm×1556 μm. The measurement shows that the ratio of second to fundamental harmonic is 10.7, the stopband rejection keeps higher than 40 dB from 5.15 to 22.2 GHz, and a transmission zero is generated at 5.7 GHz due to the magnetic cross coupling between the first and third resonator. The −1 dB bandwidth is from 3.05 to 4 GHz, and the minimum insertion loss is 1.5 dB.
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No potential conflict of interest was reported by the authors.
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Notes on contributors
Mingye Fu
Mingye Fu received the B.E. degree from Southwest Jiaotong University, Chengdu, China in 2017. He is now studying for Ph.D Degree in Southwest Jiaotong University, focusing on microwave technology. His research interests include reconfigurable/tunable RF circuits, MMIC design for broadband/high speed communications.
Qianyin Xiang
Qianyin Xiang received the Ph.D. degree in the Communication and Information Systems from Southwest Jiaotong University, Chengdu, China, in 2013. He is currently with the Institute of Microelectronics, Southwest Jiaotong University. He has been the principle investigator or researcher in many national research projects supported by the National Natural Science Foundation of China, and Chinese national 863 plan. In recent 5 years, he has published more than 30 research Journal papers on microwave circuits. He is also an active peer reviewer for IEEE Transactions on Microwave Theory and Techniques, IEEE Microwave and Wireless Components Letters, and so on. In 2015, he was awarded as the Young Scientist “Sishi Star” of SWJTU. His current research focuses on reconfigurable/tunable RF circuits, and MMIC design for broadband/high speed communications.
Quanyuan Feng
Quanyuan Feng received the M.S. degree in Microelectronics and Solid Electronics from the University of Electronic Science and Technology of China, Chengdu, China, in 1991, and the Ph.D. degree in Traffic Information Engineering and Control from Southwest Jiaotong University, Chengdu, China, in 2000. He is the Head of Institute of Microelectronics, Southwest Jiaotong University. He has been honored as the “Excellent Expert” and the “Leader of Science and Technology” of Sichuan Province because of his outstanding contributions. His research interests include RF and microwave circuits, antennas, EM compatibility, and environmental electromagnetics.
Zongliang Zheng
Zongliang Zheng received the Ph.D. degree in electronic science and technology from the University of Electronic Science and Technology of China, Chengdu, China, in 2016. From 2014 to 2015, he was a visiting scholar at the Department of Electrical and Computer Engineering, Center for Microwave Magnetic Materials and Integrated Circuits (CM3IC), Northeastern University, Boston, USA. In 2016, he joined the School of Information Science and Technology, Southwest Jiaotong University (SWJTU), Chengdu, China, as an assistant professor and master’s supervisor. He is also a member of the Institute of Microelectronics, SWJTU, and a member of IEEE. His current research interests include microwave magnetic materials and devices, novel antenna designs, magneto-dielectric materials for antenna applications, RFID technology. In recent years, Dr. Zheng has authored or co-authored more than 30 papers and invited papers in international journals and conference proceedings. He has also served as reviewer members for many journals and conferences, such as IEEE Transactions on Microwave Theory and Techniques, IEEE Transactions on Magnetics, Journal of Magnetism and Magnetic Materials, Journal of Electromagnetic Waves and Applications, AIP Advances, IEEE INTERMAG Conference, MMM Conference, etc. He now acts as the principle investigator for projects of National natural Science Foundation of China (NSFC) and Fundamental Research Fund for the Central Universities.
Zhixiong Di
Zhixiong Di received B.S. degree and Ph.D. degree in microelectronic and solid electronics from the Fuzhou University, Fuzhou, China in 2007, and Xidian University, Xi’an, China in 2014, respectively. He is currently a Lecturer with the School of Information Science & Technology, Southwest Jiaotong University, Chengdu, China. His research interests include VLSI architecture design and SoC design methodology.
Ting Peng
Ting Peng received the B.S. degree in Physics and Ph.D. degrees in Microelectronics and Solid-State Electronics, from Wuhan University, Hubei, China, in 2005 and 2010, respectively. Since 2011, he has been working on the research and development of GaAs based electron devices and process, with GaAs Technology Department, Chengdu HiWafer Semiconductor Co. Ltd., where he is currently the Manager of the Department.