Publications associées à Multi-Photon Fabrication of Ultra-compact Optical Waveguides in Polydimethylsiloxane

Radiative transfer in luminescent solar concentrators

A luminescent solar concentrator (LSC) offers a viable solution to spectrally convert and concentrate both direct and diffuse sunlight without the need for tracking. Its potential for commercialization is currently limited by the optical performance. A det ...

2024

Biomaterial devices on Arecanut palm leaf for microwave applications

Anja Skrivervik, Sujith Raman

This paper presents an investigation on the possibility of arecanut palm leaf as a biomaterial substrate for various microwave devices such as transmission lines, antenna, filter and a radio frequency identification device (RFID). The dielectric properties ...

IEEE2023

High power mm-wave loss measurements of ITER ex-vessel waveguide components at the FALCON test facility at the Swiss Plasma Center

René Chavan, Timothy Goodman, Avelino Mas Sanchez, Anastasia Xydou, Humberto Torreblanca Quiroz

Many future fusion devices will rely heavily, if not solely, on electron cyclotron (EC) heating subsystems to provide bulk heating, instability control (neoclassical tearing mode (NTM) stabilization), and thermal instability control. Efficient use of the i ...

E D P SCIENCES2023

Photonic microwave generation in the X- and K-band using integrated soliton microcombs

Rui Ning Wang, Tobias Kippenberg, Erwan Guillaume Albert Lucas, Maxim Karpov, Hairun Guo, Junqiu Liu, Arslan Sajid Raja, Jijun He

Microwave photonic technologies, which upshift the carrier into the optical domain, have facilitated the generation and processing of ultra-wideband electronic signals at vastly reduced fractional bandwidths. For microwave photonic applications such as rad ...

Nature Publishing Group2020

Efficient wavelength conversion of exchange magnons below 100 nm by magnetic coplanar waveguides

Dirk Grundler, Ping Che, Anna Kúkol'ová

Exchange magnons are essential for unprecedented miniaturization of GHz electronics and magnon-based logic. However, their efficient excitation via microwave fields is still a challenge. Current methods including nanocontacts and grating couplers require a ...

Nature Research2020

Thermal mechanical analyses of the mm-wave miter bend for the ITER electron cyclotron upper launcher first confinement system

René Chavan, Timothy Goodman, Jean-Daniel Landis, Avelino Mas Sanchez, Florian Ramseyer, Matteo Vagnoni

Each of the 4 ITER Electron Cyclotron Heating Upper Launcher (ECHUL) features 8 transmission lines used to inject microwave power of up to 1.31 MW (at the source) per line, into the plasma at 170 GHz. The microwaves are guided from the gyrotrons via (empty ...

ELSEVIER SCIENCE SA2018

Dispatching Stochastic Heterogeneous Resources Accounting for Grid and Battery Losses

Jean-Yves Le Boudec, Mario Paolone, Lorenzo Enrique Reyes Chamorro, Fabrizio Sossan, Eleni Stai

We compute an optimal day-ahead dispatch plan for distribution networks with stochastic resources and batteries, while accounting for grid and battery losses. We formulate and solve a scenario-based AC Optimal Power Flow (OPF), which is by construction non ...

2018

Electronics Emulation for Real-Time Fault Location in Power Systems

François Pierre Gaugaz

This research presents a high-speed hardware platform dedicated to emulate electrical power networks for the fault location. The solution implements an algorithm based on the Electromagnetic Time-Reversal (EMTR) principle, which allows locating faults in v ...

EPFL2017

Nonreciprocal reconfigurable microwave optomechanical circuit

Tobias Kippenberg, Nathan Rafaël Bernier, Marie Adrienne Ioannou, László Dániel Tóth, Akshay Koottandavida

Devices that achieve nonreciprocal microwave transmission are ubiquitous in radar and radio-frequency communication systems, and commonly rely on magnetically biased ferrite materials. Such devices are also indispensable in the readout chains of supercondu ...

Nature Research2017

Progress of the ECRH Upper Launcher design for ITER

René Chavan, Timothy Goodman, Olivier Sauter, Jean-Daniel Landis, Francisco Sanchez, Emanuele Poli

The design of the ITER ECRH system provides 20 MW millimeter wave power for central plasma heating and MHD stabilization. The system consists of an array of 24 gyrotrons with power supplies coupled to a set of transmission lines guiding the beams to the fo ...

Elsevier Science Sa2014

Properties and Printability of Inkjet and Screen-Printed Silver Patterns for RFID Antennas

Nico de Rooij, Francisco Molina Lopez, Danick Briand, Jinyu Jason Ruan

We report the modeling, and geometrical and electrical characterization, of inkjet and screen-printed patterns on different polymeric substrates for use as antennas in radio-frequency identification (RFID) applications. We compared the physical and electri ...

Springer Verlag2014

A Low-Loss Planar Ka-Band Antenna Subarray for Space Applications

Juan Ramon Mosig, Jean-François Zürcher, Rafal Glogowski

This paper presents the design, optimization, and experimental characterization of a planar antenna subarray for space applications. The proposed component is intended to be used as a building block for a large Ka-band antenna systems. It is a one-dimensio ...

Institute of Electrical and Electronics Engineers2013

Electromagnetic Modelling of Planar Circuits Embedded in Laterally Shielded Multilayered Media

Laleh Golestanirad

Multilayered media with printed circuits embedded between their dielectric layers are one of the most successful technologies for manufacturing planar structures with a very promising performance-to-price ratio. These planar structures include many differe ...

EPFL2011

A New Planar Antenna Element For Ka-Band Applications

Juan Ramon Mosig, Jean-François Zürcher, Rafal Glogowski

One of the most promising bands for long-range radiocommunications is the Ka-band (25-40 GHz). This is due to the existence of a natural radio transmission window around 30 GHz. Both terrestrial and satellite transmission systems are planned on this freque ...

2011

Optical Transmission Through Sub-Wavelength Slits in Metals : from Theory to Applications

This thesis explores the properties of the transmission of light through subwavelength slits in metal films. Theoretical and experimental studies on the transmission through slits in metals are presented. In addition, the potential use of these slits for d ...

EPFL2010

Tunable band-stop filter based on single RF MEMS capacitive shunt switch with meander arm inductance

Catherine Dehollain, Mihai Adrian Ionescu, Montserrat Fernandez-Bolanos Badia

This paper presents a novel high-frequency tunable band-stop filter concept based on a single MEMS capacitive shunt device which uses meander arm anchoring inductors and with a total size of 300 × 600 μm. Tuning ranges of the central frequency in the order ...

Elsevier2010

A theory of sound transmission through a clamped curved piezoelectric membrane connected to a negative capacitor

Hervé Lissek, Pavel Mokry, Tomas Sluka

An analytical calculation of the acoustic transmission loss of sound propagating through a thin cylindrically curved piezoelectric membrane, which is rigidly clamped at its straight ends, is presented. The membrane is placed inside an acoustic tube and con ...

Elsevier2010

Generalized from of Telegrapher’s Equations for the Electromagnetic Field Coupling to Buried Wires of Finite Length

Farhad Rachidi-Haeri

In this paper, a generalized form of telegrapher's equations for electromagnetic field coupling to buried wires is derived. The presented approach is based on thin-wire antenna theory. The effect of a dissipative half-space is taken into account via the re ...

2009

Tunable band-stop filter based on single RF MEMS capacitive shunt switch with meander arm inductance

Catherine Dehollain, Mihai Adrian Ionescu, Montserrat Fernandez-Bolanos Badia

This paper presents a novel high-frequency filter concept based on a single MEMS capacitive shunt structure using meander arm inductance. Tuning ranges of the central frequency in the order of 55% are experimentally demonstrated for filters operating betwe ...

2009

Contribution to characterization techniques for practical metamaterials and microwave applications

Frédéric Bongard

Metamaterials (MTMs) are broadly defined as artificial composite materials specifically engineered to produce desired unusual electromagnetic properties not readily available in nature. The most interesting unusual property achievable with MTMs is probably ...

EPFL2009