Скачать или смотреть Metasurfaces Design for Magnetic Resonance Imaging and Wireless Power Transfer Applications

Microwave Seminar at The Department of Physics & Engineering, ITMO | 01 Feb 2021

Timecodes are below the abstract.

Dr. Danilo Brizi
Department of Information Engineering, University of Pisa, Italy

Title: "Metasurfaces Design for Magnetic Resonance Imaging and Wireless Power Transfer Applications"

Abstract: In this talk, an overview on our activity on magnetic metasurfaces for Magnetic Resonance Imaging and resonant inductive Wireless Power Transfer applications is provided. In particular, the use of miniaturized spiral resonators to decouple MRI RF coils is presented. Attention is firstly directed to the spiral resonators electromagnetic characterization and then specific MRI test-cases are considered, from the basic theoretical aspects up to preliminary experimental validations carried out on fabricated prototypes. Then, bi-dimensional metasurfaces for resonant inductive Wireless Power Transfer are examined. Metasurfaces can produce an excellent WPT performance enhancement, as well as a reduced exposure in terms of Specific Absorption Rate which make them good candidates for biomedical applications and rechargeable devices. Finally, an overview on possible technological outcomes for MRI and WPT applications deriving from metasurfaces’ response control is discussed.

00:00:00 Intro
0:01:22 Speaker and group introduction by Agostino Monorchio
0:03:40 Group introduction by Danilo Brizi
0:04:46 Talk outline
0:05:56 Introduction to metasurface applicaion at low frequencies
0:07:42 Introduction to magnetic resonance imaging (MRI)
0:09:33 Coil coupling in MRI
0:11:09 Distributed magnetic traps for coil decoupling
0:12:37 Spiral resonators and their characterization
0:16:42 Theorectical approach to coil decoupling: impedance and effective permeability
0:19:12 Decoupling in double-tuned coils
0:21:25 Decoupling in coil arrays
0:23:06 Introduction to resonant inductive wireless power transfer (WPT)
0:24:32 Metasurfaces in WPT
0:26:02 Ultra-thin double-spiral metasurface design for WPT
0:28:48 Double-spiral metasurface evaluation
0:31:36 Common assumptions in metasurface design
0:33:07 Metasurface response homogenization
0:34:00 Numerical verification with spiral resonator metasurface
0:37:04 Question from Alexey Slobozhanyuk on homogenization stability under lossy load
0:40:45 Question from Stanislav Glybovski on the different modes in a metasurface
0:42:49 Questions from Mikhail Zubkov on the homogenization procedure and on the SAR distribution
0:44:46 Question from Alexey Slobozhanyuk on homogenization at different distances from the metasurface
0:46:24 Arbitrary field distribution control
0:47:03 Conclusion
0:48:46 Question from Polina Kapitanova on WPT metasurface application in the case of many receivers
0:50:36 Questions from Stanislav Glybovski on the decoupling efficiency compared to the overlapping technique and on the decoupling stability under geometrical distortions
0:53:28 Questions from Pavel Seregin on comparison with preamplifier decoupling and on combining different decoupling methods
0:55:12 Questions from Mikhail Zubkov on decoupling bandwidth and on the SAR hotspots in WPT
0:59:39 Concluding remarks
1:00:11 End

The Department of Physics and Engineering of ITMO University (Saint Petersburg, Russia) hosts online weekly seminars to discuss recent scientific achievements of researchers from all over the world with a wide audience. The topics include experimental (Optical seminar) and theoretical (Theoretical seminar) aspects of nanophotonics, solid-state physics, material science, as well as design and applications of radiofrequency structures and devices (Microwave seminar).

Upcoming and past events can be found at https://physics.itmo.ru/en/seminars

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