MTTW’2024 Program and Keynote Speakers
Riga Technical University, Scientific Library
Address: Paula Valdena street 5, 2.12 room, Riga, LV-1048.
Viewing sessions online
Online MTTW’24 sessions on October 3 will be transmitted in Zoom separately (see links in program). Program and parallel sessions of ITMS’24 conference are published on https://itms.rtu.lv/ and https://ictfest.org/.
For technical reasons, October 4, 2024, sessions will be in-person only.
Program
IMPORTANT! Links to the papers will be available during the Workshop.
| October 3, 2024 |
| 10:15–11:00 | Introductory Lecture Microstrip Divider-Combiner Based Pulse Expander by Tatjana Solovjova The presentation is devoted to a passive microwave device, which employs multiple branches with different delays to achieve pulse expansion in time from 200 ps to 450 ps. The device consists of the single printed circuit board (PCB) with a microstrip pulse splitter, three microstrip delay lines with different lengths, and a microstrip pulse combiner. The main challenge of the design lies in the necessity to match components of the pulse expander in an extremely broad frequency range from DC to approximately 4 GHz. The research consisted of several stages, which included theoretical calculations, modeling in HFSS of separate parts and whole expander, and, finally, experimental validation of components and whole microwave device. Online connection: https://rtucloud1.zoom.us/j/96804216211 IEEE Registration: https://events.vtools.ieee.org/m/436599 |
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| 11:00–13:00 | Session B1: Wireless Communications Remote Chairs: Prof. Dr. Artūrs Āboltiņš, Dr. Deniss Kolosovs Online connection: https://rtucloud1.zoom.us/j/93700461394 IEEE Registration: https://events.vtools.ieee.org/m/436611
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| 13:00–13:45 | Coffee Break | ||||||||||||||||
| 13:45–14:30 | Introductory Lecture Eighth-Order Coil Systems for Generating High Uniformity Extremely Low-frequency EM Fields: Field Computation, Application-specific Constraints and Heating Estimation by Dr. Romāns Kušņins The lecture is concerned with designing various coil systems capable of producing a magnetic field exhibiting a high degree of uniformity. Recent advances in cell therapy and molecular biology have captivated minds of researchers around the globe thereby stimulating intense scientific efforts. Promising findings in this field might substantially improve the existing medications and treatment strategies, as well as bring about novel ones. One finding is that the secretion of extracellular vesicles (EV) may be stimulated by exposing them to extremely low-frequency electromagnetic fields (ELF-EMF) without any noticeable adverse effect on their biological properties. However, it is by no means the only application of ELF-EMF produced by seemingly trivial current coil arrangements. The underlying mechanisms and workings of such coil systems will be discussed, as well as various practical challenges that must be addressed to construct practical coil systems with desired characteristics. In some specific cases, it is tremendously difficult to simultaneously ensure high magnetic field intensity, sufficiently large high-field uniformity region size, and compactness. Namely, compactness is the essential aspect of biomedical applications requiring the placement of the system into a bioreactor used to cultivate Mesenchymal Stem Cells due to the relatively small interior space. The heat produced by such systems is another critical aspect to be considered at the design stage and will also be addressed in this lecture. Online connection: https://rtucloud1.zoom.us/j/93395319114 IEEE Registration: https://events.vtools.ieee.org/m/436620 |
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| 14:30–16:30 | Session B2: Microwave Technology Remote Chairs: Dr. Romāns Kušņins, Tatjana Solovjova Online connection: https://rtucloud1.zoom.us/j/97444723426 IEEE Registration: https://events.vtools.ieee.org/m/436626
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| 18:00–21:00 | Conference Gala Dinner Czech brewery with a restaurant “Stargorod,” Republikas Laukums 1, Riga. IEEE Registration: https://events.vtools.ieee.org/m/436629 |
| October 4, 2024 |
| 09:00–09:30 | ITMS Registration | ||||||||||||||||
| 09:30–09:45 | ITMS Opening Ceremony Prof. Dr. Jānis Grabis, Prof. Dr. Oksana Ņikiforova |
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| 09:45–11:45 | ITMS In-Person Session 2 Chairs: Dr. Inese Poļaka, Dr. Bohdan Haidabrus |
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| 12:00–13:30 | ITMS In-Person Session 3 Chairs: Dr. Jana Bikovska, Dr. Jeļena Pečerska |
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| 13:30–14:00 | Coffee Break & MTTW Registration | ||||||||||||||||
| 14:00–14:15 | MTTW Opening Ceremony Prof. Dr. Anna Litviņenko, Dr. Andrejs Romānovs, Prof. Dr. Nadežda Kuņicina IEEE Registration: https://events.vtools.ieee.org/m/436634 |
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| 14:15–15:00 | Keynote Lecture Pulse Position Modulation (PPM) for Energy-Efficient Optical Communication Over Large Distances by Prof. Dr. Artūrs Āboltiņš In this presentation, we will discuss the design of the signalling waveform and the impact of the PPM waveform parameters on the energy efficiency and bitrate of the communication link. International standards which regulate signalling protocols will be reviewed in the second part. In the third part of the presentation, we will pay attention to the ongoing industrial and academic activities in Latvia and abroad related to implementing efficient PPM communication systems in terrestrial and space applications. IEEE Registration: https://events.vtools.ieee.org/m/436638 |
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| 15:00–15:45 | Keynote Lecture Lens Antennas for Future 6G and Satellite Communications by Prof. Dr. Oscar Quevedo-Teruel One of the most limiting parts of these high-frequency communications systems is the transmitters and receivers, in which antennas play a key role. Unlike conventional antennas, the new satellite and 5G/6G communications antennas must be highly directive to mitigate the free space attenuation, and they must be able to reconfigure their radiation patterns in real time. Additionally, they should have low losses to reduce the transmitted power consumption. Due to the required characteristics of these antennas, new approaches have been explored in the literature. Conventionally, arrays were employed to produce highly directive antennas at low-frequency regimes. However, at millimeter and sub-millimeter regimes, the losses of their feeding networks are high, and their cost of implementation for massive production is prohibitive. Other candidates, such as conventional reflector antennas, have problems producing electronically steerable radiation beams. In this talk, I will explain the basic operation of lens antennas, and their potential for future telecommunication systems, especially in the millimeter-wave regime.IEEE Registration: https://events.vtools.ieee.org/m/436642 |
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| 15:45–17:45 | Session A1: Microwave Technology and Wireless Communications In-Person Chairs: Dr. Deniss Kolosovs, Prof. Dr. Oscar Quevedo-Teruel IEEE Registration: https://events.vtools.ieee.org/m/436649
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| 17:45–18:00 | Closing and Awards Ceremony IEEE Registration: https://events.vtools.ieee.org/m/436651 |
Keynote Speakers
Lens Antennas for Future 6G and Satellite Communications
Oscar Quevedo-Teruel
Bio: Oscar Quevedo-Teruel is an IEEE Fellow. He received his Telecommunication Engineering and Ph.D. Degrees from Carlos III University of Madrid, Spain in 2005 and 2010. From 2010-2011, he joined the Department of Theoretical Physics of Condensed Matter at Universidad Autonoma de Madrid as a research fellow and went on to continue his postdoctoral research at Queen Mary University of London from 2011-2013.
In 2014, he joined the Division for Electromagnetic Engineering in the School of Electrical Engineering and Computer Science at KTH Royal Institute of Technology in Stockholm, Sweden where he is a Full Professor, the Responsible for the Antenna Laboratory and Director of the Master Programme in Electromagnetics Fusion and Space Engineering. He was an Associate Editor of the IEEE Transactions on Antennas and Propagation since 2018-2022 and Track Editor since 2022. He is the founder and editor-in-chief of the EurAAP journal Reviews of Electromagnetics since 2020. He was the EurAAP delegate for Sweden, Norway, and Iceland from 2018-2020, and he has been a member of the EurAAP Board of Directors since January 2021. Since January 2022, he is the vice-chair of EurAAP. He was a distinguished lecturer of the IEEE Antennas and Propagation Society for the period of 2019-2022, and Chair of the IEEE Antennas and Propagation Society’s Educational Initiatives Programme since 2020.
He has made scientific contributions to higher symmetries, transformation optics, lens antennas, metasurfaces, leaky wave antennas and high impedance surfaces. He is the co-author of more than 130 papers in international journals and more than 200 at international conferences.
Abstract: One of the most limiting parts of these high-frequency communications systems is the transmitters and receivers, in which antennas play a key role. Unlike conventional antennas, the new satellite and 5G/6G communications antennas must be highly directive to mitigate the free space attenuation, and they must be able to reconfigure their radiation patterns in real time. Additionally, they should have low losses to reduce the transmitted power consumption. Due to the required characteristics of these antennas, new approaches have been explored in the literature. Conventionally, arrays were employed to produce highly directive antennas at low-frequency regimes. However, at millimeter and sub-millimeter regimes, the losses of their feeding networks are high, and their cost of implementation for massive production is prohibitive. Other candidates, such as conventional reflector antennas, have problems producing electronically steerable radiation beams. In this talk, I will explain the basic operation of lens antennas, and their potential for future telecommunication systems, especially in the millimeter-wave regime.
Pulse Position Modulation (PPM) for Energy-Efficient Optical Communication Over Large Distances.
Arturs Aboltins
Bio: Arturs Aboltins is a seasoned researcher and professor with extensive experience in telecommunications and software development. Since 2008, he has been a Senior Researcher and Professor at Riga Technical University (RTU), where he lectures on signal theory and software-defined radio while conducting scientific research in wireless communication, ultra-wideband technology, and radar/lidar systems. Since 2022, he has been with Eventech LTD, consulting on implementing PPM-based communication systems for space applications. Arturs has a solid background in telecommunications, electronics, and software development and has worked as an engineer for telecom companies. His technical expertise includes programming languages like Python, MATLAB, C/C++, and JavaScript. He holds a PhD in Circuits and Systems from RTU and is a prolific author with over 50 scientific publications in international conferences and journals. Additionally, he has been actively involved in IEEE as the chair of the Latvia Section for Communication, Microwave, and Antenna Propagation from 2018 to 2022. His career combines academic leadership, technical innovation, and significant contributions to telecommunications research.
Abstract: Deep space communication is poised to be a key enabler of future space exploration, and the interplay between government initiatives and private ventures will likely shape its evolution over the coming decades. Demand for high-speed connections is related to the need to send large amounts of measurements from imaging and other sensors. Radio communications can provide very limited data transfer rates over distances of more than 100 000 km. Therefore, future missions to the Moon (384400 km), Mars (54.6 million km), and Jupiter (588 million km) require switching to free space optical communications (FSO) and advanced signalling techniques, such as pulse position modulation (PPM). These techniques, in conjunction with sophisticated signal processing and coding techniques, allow for significantly increased communication distance and save the power budget of the spacecraft.
In this presentation, we will discuss the design of the signalling waveform and the impact of the PPM waveform parameters on the energy efficiency and bitrate of the communication link. International standards which regulate signalling protocols will be reviewed in the second part. In the third part of the presentation, we will pay attention to the ongoing industrial and academic activities in Latvia and abroad related to implementing efficient PPM communication systems in terrestrial and space applications.