https://orcid.org/0000-0002-6216-7581
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ABSTRACT
In this paper, the realization of traveling-wave directional filters allowing for selectivity improvement without increasing filter’s order is presented and studied. It is shown that the introduction of loose cross-coupling between #(n-1)th loop resonator and isolated port of the nth-order directional filter allows for generating transmission zeros in the bandpass branch and thus to improve the filter`s roll-off. Moreover, the electrical length of the cross-coupling connecting transmission line allows for adjusting the location of transmission zeros and realizing symmetric or asymmetric frequency response. The presented approach is theoretically analyzed and experimentally verified. Exemplary second- and third-order directional filters with symmetrically placed transmission zeros were designed to operate at f0 = 1 GHz, manufactured and measured. The obtained results prove their applicability towards the realization of frequency multiplexers.
Disclosure statement
No potential conflict of interest was reported by the authors.
ORCID
Jakub Sorocki http://orcid.org/0000-0002-6216-7581
Kamil Staszek http://orcid.org/0000-0002-3866-8466
Ilona Piekarz http://orcid.org/0000-0001-9862-5794
Slawomir Gruszczynski http://orcid.org/0000-0002-0370-8640
Krzysztof Wincza http://orcid.org/0000-0002-4471-7842
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Funding
Notes on contributors
Jakub Sorocki
Jakub Sorocki received the MSc and PhD degrees in the field of electrical engineering from the AGH University of Science and Technology, Krakow, Poland in 2013 and 2018, respectively. Since 2012 he has been cooperating with Microwave Technology and High Frequency Electronics research group at Department of Electronics, AGH UST. In 2017 he was a visiting researcher at the Michigan State University, East Lansing, MI, USA. He has co-authored over 65 publications in peer-reviewed journals and conferences. His research interests are focus on development of low-loss and high-performance microwave circuits is strip transmission line technique.
Kamil Staszek
Kamil Staszek received the MSc and PhD degrees in electronics engineering from the AGH University of Science and Technology, Kraków, Poland, in 2011 and 2015, respectively. He is currently with the Department of Electronics, AGH University of Science and Technology. He has co-authored over 28 journals and 25 conference papers. His current research interests include multiport measurement techniques and design of the broadband passive components.
Ilona Piekarz
Ilona Piekarz received the MSc and PhD degrees in the field of electrical engineering from the AGH University of Science and Technology, Krakow, Poland in 2013 and 2018, respectively. Since 2011 she has been cooperating with Microwave Technology and High Frequency Electronics research group at Department of Electronics, AGH UST. In 2017 she was a visiting researcher at the Michigan State University, East Lansing, MI, USA. She has co-authored over 65 publications in peer-reviewed journals and conferences. Her research interests include development of novel sensors and measurement systems in strip transmission line technique as well as miniaturization of passive microwave circuits.
Slawomir Gruszczynski
Slawomir Gruszczynski received the MSc and PhD degrees in electronics and electrical engineering from the Wroclaw University of Technology, Wroclaw, Poland, in 2001 and 2006, respectively. From 2001 to 2006, he was with the Telecommunications Research Institute, Wroclaw, and from 2005 to 2009, he was with the Institute of Telecommunications, Teleinformatics, and Acoustics, Wroclaw University of Technology. In 2009, he joined the Faculty of Informatics, Electronics, and Telecommunications, AGH University of Science and Technology, Krakow, Poland, where he became the Head of the Department of Electronics in 2012. He has co-authored more than 40 journals and more than 50 conference scientific papers. Dr Gruszczynski is a member of the Young Scientists' Academy at the Polish Academy of Sciences (PAN) and the Committee of Electronics and Telecommunications at PAN.
Krzysztof Wincza
Krzysztof Wincza received the MSc degree and the PhD degree in electronics and electrical engineering from the Wroclaw University of Technology, Poland, in 2003 and 2007, respectively. In 2007, he joined the Institute of Telecommunications, Teleinformatics and Acoustics, Wroclaw University of Technology, and since 2009 he has held the position of an Assistant Professor at the Department of Electronics at AGH University of Science and Technology, Krakow, Poland, where in 2012 he received the DSc degree (habilitation). In 2012 Dr Wincza attended the training program at the Stanford University, USA. Dr Wincza has co-authored over 40 journal and over 50 scientific conference papers. His current research interests concern analysis and development of microwave passive devices, such as ultra-broadband directional couplers, microstrip antenna arrays and composite right-left handed artificial transmission lines, as well as multiport reflectometers. He is currently a member of the Editorial Boards of the IEEE Microwave and Wireless Components Letters and the Technical Program Committee of the International Conference on Microwaves, Radar, and Wireless Communications (MIKON). He served as an expert of the European Union COST 284 Project (2003–2006) and as an expert of the Polish National Science Center (2012–2014). Dr Wincza was the recipient of The Youth Award presented at the 10th National Symposium of Radio Sciences (URSI) and the Young Scientist Grant awarded by the Foundation for Polish Science in 2001 and 2008, respectively.