报告题目: Microstrip Branch-line Directional Couplers with Efficient Compensation of Junction Discontinuities

报告人:  Dmitry Kholodnyak

报告时间: 2025年7月28日(周一)上午10:00-11:30

地点：微波楼2楼会议室

主持人: 万发雨  教授

报告人简介:Dmitry Kholodnyak received the Diploma of Radio Engineer, the Ph.D. degree in antennas and microwave devices, and the Dr.Sc. degree in engineering, all from Saint Petersburg Electrotechnical University (ETU) “LETI”, Russia in 1996, 2012, and 2016, respectively. He has taught at ETU “LETI” since 2000. He is a Full Professor and the Head of the Department of Microwave Electronics. His research interests are focused on microwave applications of metamaterials, high-temperature superconductors, low temperature co-fired ceramics technology, and non-Foster circuits realizing negative inductors and capacitors to design advanced microwave devices with improved performance and enhanced functionality. Dr. Kholodnyak gained 30-year experience in practical design of microwave devices for different applications. He authored over 250 technical publications including 5 monographs and book chapters, 7 tutorial textbooks, 43 refereed journal articles, over 140 international conference papers, and 16 patents. He was a recipient of the 2003 State Prize of the Russian Federation awarded to young scientists for outstanding works in science and technology. Dr. Kholodnyak is a Senior Member of the IEEE MTT-S and AP-S. He is the Vice Chair of the IEEE Russia Northwest Section. He served as the Chair or the MTT7 Microwave Superconductivity and Quantum Technologies Committee in 2019-2020. He is also a member of the European Microwave Association (EuMA) and the Institute of Electronics, Information and Communication Engineers (IEICE), Japan.

报告摘要：

Although geometry of a branch-line directional coupler is very simple, its design and practical implementation are complicated by the need to compensate an impact of discontinuities of transmission line T-junctions, which is manifested in the input mismatch and shift of the main characteristics (power division, isolation and return loss) in frequency and with respect to each other. The available techniques to design microstrip branch-line directional couplers with compensated impact of junction discontinuities deal with correction of length and width of all the constituent transmission line sections and require a numerical optimization to find appropriate values of the geometrical parameters. A modified layout of the microstrip branch-line directional coupler has been recently proposed, which is less sensitive to the effect of junction discontinuities and allows for its easier and compensation compared to the known approaches.

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电子与信息工程学院

2025年7月25日