Modélisation et caractérisation expérimentale d’un résonateur microruban reconfigurable en fréquence par décharge plasma

Dans ce papier, la reconfigurabilité en fréquence d’un résonateur microruban par décharge plasma est démontrée. Des simulations plasma (prenant en compte la dynamique des fluides, l’électrostatique, etc.) sont considérées afin d’intégrer un modèle de plasma réaliste dans les simulations électromagnétiques du résonateur. Les résultats de simulation sont cohérents avec la mesure et rendent prometteur cette technique d’intégration de plasma volumique dans des circuits microondes

Antenne VHF miniature reconfigurable en fréquence par décharge plasma : modélisation et résultats expérimentaux

Dans ce papier, nous proposons l’utilisation d’un plasma froid hors équilibre thermodynamique comme matériau à permittivité négative dans la réalisation d’une antenne sphérique miniature à résonance quasi-statique. Cette résonance est étudiée analytiquement puis numériquement et un prototype expérimental est présenté

Analytical Model to Study the Electrostatic Resonance of Sub-Wavelength Radially Inhomogeneous Negative Permittivity Spheres

This letter presents an analytical model to study the electrostatic scattering of subwavelength radially inhomogeneous spheres whose permittivity can be expressed as a general polynomial function of the radial distance r. This technique is particularly well suited to characterize the electrostatic resonance, also known as surface plasmon resonance, of radially inhomogeneous negative permittivity spheres

Modélisation et caractérisation expérimentale d’un résonateur microruban reconfigurable en fréquence par décharge plasma

Dans ce papier, la reconfigurabilité en fréquence d’un résonateur microruban par décharge plasma est démontrée. Des simulations plasma (prenant en compte la dynamique des fluides, l’électrostatique, etc.) sont considérées afin d’intégrer un modèle de plasma réaliste dans les simulations électromagnétiques du résonateur. Les résultats de simulation sont cohérents avec la mesure et rendent prometteur cette technique d’intégration de plasma volumique dans des circuits microondes

Frequency-agile microstrip resonator using DC plasma discharge

An original and integrated solution to provide frequency agility to microstrip circuits using plasma is proposed. A volume DC plasma discharge is implemented inside a microstrip circular resonator to change its dielectric permittivity in order to tune its frequency. Plasma relative permittivity indeed exhibits positive values lower than 1. Experimental measurements confirm the tuning abilities and performances of such a solution for different pressures and types of gas

Modeling and experimental measurements of a tunable microstrip resonator using plasma discharges.

In this paper, we suggest the use of a cold plasma as tunable material inside a microstrip resonant cavity. Plasma dielectric constant can indeed be moved to values below 1 to tune its resonant frequency. DC plasma analysis were conducted and integrated into classic electromagnetic solvers to investigate tuning abilities. Numerical simulations are consistent with experimental results and make this original tuning techniques viable for high power applications

Conjugated Polymer and Hybrid Polymer-Metal Single Nanowires: Correlated Characterization and Device Integration

This book describes nanowires fabrication and their potential applications, both as standing alone or complementing carbon nanotubes and polymers. Understanding the design and working principles of nanowires described here, requires a multidisciplinary background of physics, chemistry, materials science, electrical and optoelectronics engineering, bioengineering, etc. This book is organized in eighteen chapters. In the first chapters, some considerations concerning the preparation of metallic and semiconductor nanowires are presented. Then, combinations of nanowires and carbon nanotubes are described and their properties connected with possible applications. After that, some polymer nanowires single or complementing metallic nanowires are reported. A new family of nanowires, the photoferroelectric ones, is presented in connection with their possible applications in non-volatile memory devices. Finally, some applications of nanowires in Magnetic Resonance Imaging, photoluminescence, light sensing and field-effect transistors are described. The book offers new insights, solutions and ideas for the design of efficient nanowires and applications. While not pretending to be comprehensive, its wide coverage might be appropriate not only for researchers but also for experienced technical professionals

Experimental study of a tunable sub-wavelength plasma-based VHF-UHF resonator

In this paper, a tunable sub-wavelength resonator using a hemispherical plasma discharge is investigated at VHF-UHF frequencies. The overall setup is detailed. The resonance is experimentally investigated with an indirect method which consists in studying the influence of the plasma hemisphere on the transmission between two near-field monopole probes. The design presented here opens new perspectives for the realisation of plasma-based electrically small antennas thanks to a nonintrusive and adequate integration of the whole plasma control system below a ground plane

Preliminary study on the feasibility of a plasma-based electrically small ENG antenna

The use of low pressure non-equilibrium plasma as epsilon negative medium for a zero-order spherical antenna resonator is considered. Static behaviour of the resonance for a non-homogeneous plasma is investigated under quasi-static assumption and discrete radial description of the plasma. Analytical and numerical results are consistent and show that the implementation of such a plasma-based antenna is possible