[AP-S Seminar Series] Space-Time Metasurfaces, Sajjad Taravti, Apr. 29, 4-5 PM EST
The University of Toronto Student Chapter of the IEEE Antennas and Propagation Society (AP-S) invites you to the following talk in our 2020-2021 seminar series:
Space-Time Metasurfaces: Physics and Applications to Modern Communication Systems, presented by Sajjad Taravati, PDF at the University of Toronto, on Thursday, Apr. 29, 2021, 4-5 PM EDT.
Abstract: In this talk, I discuss the latest findings on the theory, design procedure, practical implementation scenarios and applications of space-time metasurfaces. Recent progress on space-time metasurfaces for breaking time-reversal symmetry and reciprocity reveals a great potential for applications of such metasurfaces for low-energy and energy-harvesting telecommunication systems, and compact and integrated nonreciprocal devices, and sub-systems. Recently there has been a growing interest on four-dimensional metasurfaces, where adding the temporal variation to three-dimensional metasurfaces leads to functionalities that are far beyond the capabilities of conventional static metasurfaces. Space-time metasurfaces are capable of four-dimensional electromagnetic wave transformations which are significantly more versatile and useful than the three-dimensional wave transformations of conventional spatially variant static metamaterials and metasurfaces. I first present key properties of space and time interfaces, including spatial interfaces, temporal interfaces, and space-time interfaces, and practical implementation of a space-time moving interface using a nonreciprocal metasurface. Next, analysis of general STM metasurfaces will be given, including derivation of scattered electromagnetic fields, four-dimensional dispersion diagrams, boundary conditions, and spatiotemporal decomposition. Then, I discuss about finite difference time domain (FDTD) simulation of space-time metasurfaces. I will also present some of the unique applications of space-time metasurfaces, including nonreciprocal full-duplex communication, pure frequency conversion, parametric wave amplification, spatiotemporal decomposition, space-time wave diffraction, antenna-mixer-amplifier transceiver functionality, radiation pattern coding, and mixer-duplexer-antenna leaky-wave operation.
Date and Time
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- Date: 29 Apr 2021
- Time: 04:00 PM to 05:00 PM
- All times are (GMT-05:00) Canada/Eastern
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- Toronto, Ontario
- Canada
- Starts 09 April 2021 09:34 AM
- Ends 29 April 2021 03:00 PM
- All times are (GMT-05:00) Canada/Eastern
- No Admission Charge
Speakers
Sajjad Taravati
Biography:
Sajjad Taravati received his Ph.D. degree in 2017 in electrical engineering from Polytechnique Montreal, Montreal, QC, Canada, where he was conducting research on nonreciprocal magnetless electromagnetic systems and analog signal processing. From 2017 to 2018, he was a Postdoctoral Fellow in the group of Prof. Ahmed A. Kishk at the Concordia University, Montreal, Canada, where he was conducting research in the field of electromagnetics, nonreciprocity, and space-time modulation. He is currently a Post-Doctoral Fellow at the University of Toronto, Toronto, Ontario, Canada. His current research interests include nonreciprocal magnetless systems, space–time-modulated structures, electronic circuits and systems, broadband phase shifters, wave engineering, airborne telecommunication transceivers, analysis and design of microwave active and passive circuits, RF modules, antennas, electromagnetic theory, invisibility cloaking, and active and nonreciprocal metasurfaces. Dr. Taravati received the Khwarizmi International Award in 2010 and the Outstanding Researcher Student Award of IUST in 2012. In 2018, he received the Horizon Postdoctoral Fellowship and the Graduate Student Award both from the Concordia University, Montreal. Dr. Taravati is now the Technical Advisor at LATYS Intelligence (latys.ca), a start-up company that is supported by the well-known start-up incubator TandemLaunch Inc. and is established based on two of Dr. Taravati’s research work on versatile and programmable space-time metasurfaces.