The Workshop on Metasurfaces

13.09.2019
10:00
Begin
13.09.2019
10:00
Place

Lomonosova 9, room 1220

The Workshop on Metasurfaces and resonators for Wireless Power Transfer

If you want to know how to charge your phone without using a cable and how the WPT can be useful in real life, attend the workshop and find out!

 

1.       Geoffroy Lerosey (co-founder and the inventor of the concepts behind the deeptech startup Greenerwave, France) will deliver a talk «Wavefront shaping in the microwave domain using tunable metasurfaces for enhanced electromagnetic wave control: From theory to products» in which he will show how the original ideas of time reversal of ultrasounds and microwaves developed at Institut Langevin during the past 30 years have led to a very rich and interesting research domain in optics that is called wavefront shaping, explain how the idea to transpose the concept of wavefront shaping to the microwave domain appeared, propose the concept of wave field shaping in cavities using tunable metasurfaces, describe briefly its main different physical regimes and talk about various applications, starting from wireless communications, and talk about the startup we founded to valorize it: Greenerwave.

2.       Andreas Rennings (University of Duisburg-Essen, Germany) will present a talk «Dielectric resonators to enhance the radiation of the chip» in which he will propose a solution for the use of the dielectric resonators. For operation frequencies above 200 GHz the integration of antennas directly on the chip is crucial. The corresponding radiators are termed on-chip antennas. The so-called back end of line (BEOL) of the chip, where all the passive circuitry (including the antennas) is realized on, is extremely thin -- only around 10 micron. Thus, standard planar antennas, like patches, are inefficient and narrow-band up to roughly 0.5 THz, due to the close proximity of the patch to the ground plane. Here in this talk a potential solution of the mentioned issue is considered -- dielectric resonators (DRs) are utilized to enhance the radiation of the chip. The original metallic antenna structure works now as a coupling element to the DR, which acts like an interface to free space. Single DRs of different shape are evaluated as 250 GHz radiators. Furthermore several DRs are applied for arrays with more directivity. Here the coupling between adjacent DRs matters and the electric field is organically out-coupled to free-space.

3.       Jayathurathnage Prasad (Aalto University, Finland) will present recent investigations on “Automatic power flow control in multi-transmitter wireless power transfer”. Free positioning of receivers is one of the key requirements for many wireless power transfer (WPT) applications, required from the end-user point of view. However, realization of stable and effective wireless power transfer for  freely positioned receivers is technically challenging task because of the requirement of complex control and tuning. In this talk, the concept of automatic receiver tracking and power channeling for multi-transmitter WPT systems is introduced. The proposed WPT system is capable of maintaining stable output power with constant high efficiency regardless of the receiver position and without having any active control or tuning.

4.       Polina Kapitanova (ITMO University, Russia) will introduce a concept of a metasurface-based smart table for WPT applications. The smart table with the metasurface embedded or placed underneath the desktop allows powering multiple devices simultaneously, regardless of how they are located on the table and oriented relative to each other. The main novelty is the utilization of numerous exotic functionalities of metasurfaces and their potentials to arbitrarily control of electromagnetic fields. The results of numerical simulations and first experimental data of smart table prototypes will be demonstrated.
 

5.       Irina Munina (LETI, Russia) will present a talk "Simplified Beamforming for High Capacity Wireless Networks". The spatial division represents an efficient approach to increasing data throughput in wireless networks. It can be implemented by spanning the channel in spatial domain with several beams. The beams can be generated by a Fourier transform (FT) beamforming network or transmitarray. This work presents a feasibility study of a simplified front-end architecture based on a spatial discrete FT beamforming network, with the number of the output ports being lower than the number of the elements in the antenna array. The second approach is using 1-bit transmitarray. We report on the design, simulation and measurement of a novel tiled 1-bit transmitarray operated in C-band. The device works at two orthogonal polarizations and, as such, can support polarization diversity communication schemes. 

 Join us this Friday, no registration is needed!