Concept

Impedance of free space

Related publications (28)

Spiral spin-liquid and the emergence of a vortex-like state in MnSc2S4

Jonathan White, Gregory Scott Tucker, Romain Sibille, Shang Gao

Spirals and helices are common motifs of long-range order in magnetic solids, and they may also be organized into more complex emergent structures such as magnetic skyrmions and vortices. A new type of spiral state, the spiral spin-liquid, in which spins f ...

Nature Publishing Group2017

Design Considerations for Wearable Antennas

Anja Skrivervik, Zvonimir Sipus, Jovanche Trajkovikj, Benjamin Fuchs

With the development of generalized connectivity and the increased use of Body Area Networks, wearable antennas have become ubiquitous in the last decade. Their design presents a challenge, as they per definition are located at the interface between free s ...

Ieee2016

Design of Compact Air-Vias-Perforated SIW Horn Antenna With Partially Detached Broad Walls

Lei Wang

A novel substrate-integrated waveguide (SIW) horn antenna with partially detached broad walls is designed and analyzed. The conventional SIW horn antenna suffers from narrow-operating bandwidth, which mainly results from the mismatch at the horn aperture b ...

Ieee-Inst Electrical Electronics Engineers Inc2016

Wearable, multi-parametric wireless system-in-patch for hydration level monitoring

Mihai Adrian Ionescu, Hoël Maxime Guérin

Wearable system based on an in-situ four-probe impedance measurement at different signal frequencies for the topical monitoring of at least one physiological parameter reflecting the hydration status such as skin conductivity, ion concentration in sweat or ...

2016

Feeding structure influence on performance of two UWB antennas near a human arm

Anja Skrivervik, Mohsen Koohestani

This paper reports a study of the feeding structure influence on impedance matching and system fidelity factor of two loaded UWB antennas when placed near a human arm. To this aim, two identical dielectric loaded versions of the same UWB antenna designs wi ...

2014

Metamaterial buffer for broadband non-resonant impedance matching of obliquely incident acoustic waves

Romain Christophe Rémy Fleury

Broadband impedance matching and zero reflection of acoustic waves at a planar interface between two natural materials is a rare phenomenon, unlike its optical counterpart, frequently observed for polarized light incident at the Brewster angle. In this art ...

Acoustical Society of America2014

Parametric inversion of spin currents in semiconductor microcavities

Hugo Pierre Alexandre Flayac

The optical spin-Hall effect results in the formation of an antisymmetric real-space polarization pattern giving birth to spin currents. In this work, we show that the exciton-polariton parametric scattering allows us to reverse the sign of these currents. ...

Amer Physical Soc2013

Piezoelectric Actuators Characterization

Pierre-André Farine, Alexis Boegli, Christian Robert, Patrick Stadelmann

This paper describes a system to drive piezoelectric actuators over more than one decade of voltages and one octave of frequencies, in order to perform high-speed complex impedance characterization at a user chosen voltage excitation level. This characteri ...

Ieee Computer Soc2012

High Intensity Beam Issues in the CERN Proton Synchrotron

Sandra Aumon

This PhD work is about limitations of high intensity proton beams observed in the CERN Proton Synchrotron (PS) and, in particular, about issues at injection and transition energies. With its 53 years, the CERN PS would have to operate beyond the limit of i ...

EPFL2012

On the Characteristics of Highly Confined Light Fields

Myun Sik Kim

The Investigation of highly confined light fields created by different mechanisms, such as refraction, diffraction, and scattering, are the main subject of this thesis. We distinguish a specific scattering phenomenon of dielectric microspheres from general ...

EPFL2011

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