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16 results on '"Camille Jouvaud"'

1. Co-Design and Characterization of a Differential Wireless Passive Micro-Electromechanical System Pressure Sensor

Author

Romain Alcesilas, Jean Claude Bastien, Marc Sansa, Camille Jouvaud, Patrice Rey, and Christophe Delaveaud

Subjects
sensor, MEMS, miniature antenna, pressure, RF, General Works
Abstract

We present a differential wireless passive sensor based on a miniature antenna associated with a MEMS capacitive pressure sensor. In this configuration, a change in the external pressure results in a shift of the antenna resonance frequency and, thus, a variation in the antenna Radar Cross Section (RCS) detectable from a distance of a few meters. The MEMS and the antenna are modelled and simulated, and a co-design procedure is developed to optimize their performance. The MEMS are fabricated on a 200-mm technological platform and characterized. A specific setup was conceived to characterize the antenna sensor as a function of pressure in an anechoic chamber.

Published
2024
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6. Polarization Conversion from a Two-Port Impedance Loaded Tag

Author

Luis Felipe Fonseca Dias, Camille Jouvaud, Christophe Delaveaud, Herve Aubert, Département Systèmes (DSYS), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Équipe MIcro et Nanosystèmes pour les Communications sans fil (LAAS-MINC), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
[SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, polarization conversion, polarization diversity, passive scatterer, electromagnetic backscattering
Abstract

International audience; In this paper, we propose a Polarization Diversity scheme based on a multiport microstrip patch antenna as a batteryless backscattering target using a simple 4-resistance load arrangement. When illuminated by circularly-polarized (CP) field, 4 polarization states are achieved, namely Vertical, Horizontal, Left-Handed and Right-Handed (VP, HP, LHCP and RHCP). For CP responses, Axial Ratio (AR) inferior to 1.5 dB and, for Linear Polarization (LP), more than 25 dB performances have been experimentally validated. The LHCP to LHCP conversion as a particularly advantageous attainment for better indoor propagation. The load is part of a Coplanar Transmission Line (CPTL) integrated to the ground of the tag. This solution can be easily integrated to already existing RFID systems

Published
2022
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7. Linear-to-Circular Polarization Conversion from Impedance Loading of Single-Port Patch Antennas

Author

Christophe Delaveaud, Luis Felipe Fonseca Dias, Hervé Aubert, Camille Jouvaud, Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Équipe MIcro et Nanosystèmes pour les Communications sans fil (LAAS-MINC), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), and Université Fédérale Toulouse Midi-Pyrénées

Subjects
Materials science, Scattering, Acoustics, 020208 electrical & electronic engineering, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, 020206 networking & telecommunications, Port (circuit theory), 02 engineering and technology, Polarization (waves), law.invention, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, law, Hardware_GENERAL, 0202 electrical engineering, electronic engineering, information engineering, Clutter, Radar, Antenna (radio), Electrical impedance, Circular polarization, Computer Science::Information Theory
Abstract

International audience; Electromagnetic theory of antenna scattering has been previously applied to the minimization/maximization of radar signatures, and has been eventually used for designing antenna sensors for passive wireless sensing systems, in which the antenna backscattering mode is controlled by loading impedances. To mitigate the clutter and reduce polarization mismatch in such wireless systems, this paper investigates the linear-to-circular conversion of electric field from loading single-port patch antennas by passive impedance.

Published
2020
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8. Enhancing surface coil sensitive volume with hybridized electric dipoles at 17.2 T

Author

Julien de Rosny, Tania S. Vergara Gomez, Frank Kober, Redha Abdeddaim, Stefan Enoch, Abdelwaheb Ourir, Camille Jouvaud, Marc Dubois, Luisa Ciobanu, Institut FRESNEL (FRESNEL), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Centre de résonance magnétique biologique et médicale (CRMBM), Assistance Publique - Hôpitaux de Marseille (APHM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), CLARTE (CLARTE), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut Langevin - Ondes et Images (UMR7587) (IL), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut des Sciences du Vivant Frédéric JOLIOT (JOLIOT), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Service NEUROSPIN (NEUROSPIN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-Assistance Publique - Hôpitaux de Marseille (APHM)-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Electronique et des Technologies de l'Information (CEA-LETI), Université Grenoble Alpes (UGA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Université Grenoble Alpes (UGA), Institut Langevin - Ondes et Images, Université Paris Diderot - Paris 7 (UPD7)-ESPCI ParisTech-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA))

Subjects
Larmor precession, [PHYS]Physics [physics], Nuclear and High Energy Physics, Materials science, Field (physics), business.industry, Plane (geometry), Biophysics, Metamaterial, 010402 general chemistry, Condensed Matter Physics, 01 natural sciences, Biochemistry, Imaging phantom, 030218 nuclear medicine & medical imaging, 0104 chemical sciences, 03 medical and health sciences, Resonator, Electric dipole moment, 0302 clinical medicine, Optics, Signal-to-noise ratio (imaging), business
Abstract

International audience; Preclinical MR applications at 17.2 T can require field of views on the order of a few square centimeters. This is a challenging task as the proton Larmor frequency reaches 730 MHz. Most of the protocols at such frequencies are performed with surface transceiver coils for which the sensitive volume and the signal to noise ratio (SNR) is given by their size. Here we propose an approach based on metamaterials in order to enhance the sensitive volume of a commercial surface coil for small animal imaging at 17.2 T. We designed a passive resonator composed of four hybridized electric dipoles placed onto the floor of the MRI bed. Combining numerical and experimental results on a phantom and in vivo, we demonstrate a 20% increase of the sensitive volume in depth and 25% along the rostro-caudal axis while maintaining more than 85% of the local SNR right beneath the surface coil plane. Moreover, our solution gives the ability to double the average SNR in the region between 1.2 and 2 cm away from the loop using a single layer of 1 mm thick metallic wires easy to design and manufacture.

Published
2019
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9. High self-interference mitigation achieved thanks to significant antenna isolation and advanced RF frontend for In-Band Full-Duplex communications

Author

David Dassonville, Camille Jouvaud, and Patrick Rosson

Subjects
Antenna isolation, Patch antenna, Test bench, Computer science, 020208 electrical & electronic engineering, Environment controlled, 020206 networking & telecommunications, 02 engineering and technology, Polarization (waves), Self interference, Front and back ends, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Broadside
Abstract

Several techniques are used to mitigate the Self-Interference (SI) in In-Band Full-Duplex (IBFD) applications. Antenna isolation and especially dual polarized antenna is an efficient way to reach such objective in restricted footprint. Moreover antenna isolation does not generate noise and it does not create non-linear distortion. A test bench, including dual port antenna, analog and digital cancellation techniques is proposed, and the SI cancellation is evaluated in a controlled environment. A specific design of antenna is presented. An isolation of 47.5 dB is experimentally obtained between the two cross-polarized ports of a particular patch antenna. Matching of the antenna’s reflection parameters to -20 dB and broadside gains of 8 dBi are obtained. The additional analog and digital cancellers bring 48.9 dB more cancellation to reach 103 dB Self Interference mitigation.

Published
2019
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10. Robust reconfigurable electromagnetic pathways within a photonic topological insulator

Author

S. Hossein Mousavi, Alexander B. Khanikaev, Azriel Z. Genack, Xiang Ni, Xiaojun Cheng, and Camille Jouvaud

Subjects
Materials science, business.industry, Scattering, Mechanical Engineering, Metamaterial, 02 engineering and technology, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Topology, 01 natural sciences, Electromagnetic radiation, Mechanics of Materials, Robustness (computer science), Topological insulator, 0103 physical sciences, Optoelectronics, General Materials Science, Gauge theory, Photonics, 010306 general physics, 0210 nano-technology, business, Microwave
Abstract

The discovery of topological photonic states has revolutionized our understanding of electromagnetic propagation and scattering. Endowed with topological robustness, photonic edge modes are not reflected from structural imperfections and disordered regions. Here we demonstrate robust propagation along reconfigurable pathways defined by synthetic gauge fields within a topological photonic metacrystal. The flow of microwave radiation in helical edge modes following arbitrary contours of the synthetic gauge field between bianisotropic metacrystal domains is unimpeded. This is demonstrated in measurements of the spectrum of transmission and time delay along the topological domain walls. These results provide a framework for freely steering electromagnetic radiation within photonic structures.

Published
2016
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11. Maximization of measurement sensitivity and reading range of passive RF sensors from complex impedance optimization

Author

Francois Sarrazin, Christophe Delaveaud, Camille Jouvaud, Herve Aubere, Victor Engelhardt, Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Équipe MIcro et Nanosystèmes pour les Communications sans fil (LAAS-MINC), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
business.industry, Computer science, 020206 networking & telecommunications, 02 engineering and technology, Maximization, Temperature measurement, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Range (statistics), Wireless, Radio frequency, Sensitivity (control systems), Antenna (radio), business, Electrical impedance
Abstract

International audience; This paper reports a method to improve the performances of passive Radiofrequency sensors in terms of reading range and measurement sensitivity. More specifically the impedance profile of the sensing device that maximizes the measurement sensitivity and reading range is derived. This profile allows predicting the largest achievable reading range and the highest measurement sensitivity that can be achieved by a given sensor antenna. The proposed original method is illustrated through the design of a wireless and passive temperature sensor. Experimental results are reported for validation purposes.

Published
2017
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12. Optimisation d'une antenne miniature pour des applications de capteurs sans fil

Author

Victor Engelhardt, Francois SARRAZIN, Camille Jouvaud, Christophe Delaveaud, Hervé Aubert, Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Équipe MIcro et Nanosystèmes pour les Communications sans fil (LAAS-MINC), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
[SPI.ELEC]Engineering Sciences [physics]/Electromagnetism
Abstract

National audience; Cet article présente le développement et la réalisation d'une antenne miniature destinée à être utilisée pour des capteurs sans fil. Une étude sur la topologie de l'antenne a été effectuée afin d'optimiser ses performances. Son ren-dement important ainsi que son fort facteur de qualité per-mettent ainsi d'augmenter sa portée ainsi que d'accroître son efficacité spectrale. La mesure des propriétés d'im-pédance et de rayonnement de trois prototypes valide le comportement obtenu en simulation.

Published
2017

13. SURFACE WAVES RADIATION BY FINITE ARRAYS OF MAGNETOELECTRIC RESONATORS

Author

Julien de Rosny, Abdelwaheb Ourir, and Camille Jouvaud

Subjects
Coupling, Physics, Radiation, business.industry, Condensed Matter Physics, Computational physics, Resonator, Wavelength, Dipole, Optics, Surface wave, Q factor, Wavenumber, Electrical and Electronic Engineering, business, Magnetic dipole
Abstract

We study the propagation of waves on inflnite and flnite size arrays made of subwavelength magnetoelectric resonators. We propose an analytical study where each magnetoelectric resonator is modelled simultaneously by an electric and a magnetic dipole. We show how near fleld coupling and wavenumber quantiflcation due to the flnite size of the structure induce a frequency splitting of the resonator fundamental mode. We theoretically demonstrate that despite a spatial period of the waves smaller than half wavelength (in vacuum), the structure can e-ciently emits radiations. An analytic expression of the Q factor associated to the radiation losses is proposed. To correctly estimate this factor, we show that not only near but also far fleld interaction terms between the dipoles must to be considered.

Published
2012
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14. Electromagnetic coupling in a planar periodic configuration of resonators

Author

A. Ourir, J. de Rosny, and Camille Jouvaud

Subjects
Physics, lcsh:QC501-766, Radiation, Resonance, Periodic, lcsh:QC1-999, Electronic, Optical and Magnetic Materials, Computational physics, Electromagnetic, Split-ring resonator, Resonator, Dipole, Coupling, Nuclear magnetic resonance, Dispersion relation, lcsh:Electricity and magnetism, Resonators, Electrical and Electronic Engineering, Antenna (radio), Magnetic dipole, Coupling coefficient of resonators, lcsh:Physics
Abstract

We are studying arrays composed of a periodic arrangement of sub-wavelength resonators. An analytical model is developed inside an array of 4 by 4 multi-gap split ring resonators. To describe the frequency splitting of the single fundamental resonance, we propose a simple model based on the approximation of each resonator as an electrical dipole and a magnetic dipole that are driven by the same complex amplitude. We show that the relative strength of the two dipoles strongly depends on cell symmetry. With this approximation, the dispersion relation can be obtained for an infinite size array. A simple matrix diagonalization provides a powerful way to deduce the resonant frequencies for finite size array. These results are comforted by numerical simulations. Finally, an experimental demonstration of a tunable antenna based on this study is presented.

Published
2012

15. Optical properties of metamaterials: Influence of electric multipoles, magnetoelectric coupling, and spatial dispersion

Author

N. Guth, J. de Rosny, Redha Abdeddaim, Abdelwaheb Ourir, Bruno Gallas, G. Guida, Johan Grand, Camille Jouvaud, Josette Rivory, Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Nanostructures et optique (INSP-E4), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Institut Langevin - Ondes et Images (UMR7587) (IL), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Energétique Mécanique Electromagnétisme (LEME), Université Paris Nanterre (UPN), Sorbonne Université (SU)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Paris (UP)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Coupling, Physics, Permittivity, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Condensed matter physics, business.industry, Surface plasmon, Magnetoelectric effect, Physics::Optics, Metamaterial, Condensed Matter Physics, Polarization (waves), 01 natural sciences, Chirality (electromagnetism), Electronic, Optical and Magnetic Materials, 010309 optics, Optics, 0103 physical sciences, Mueller calculus, 010306 general physics, business, ComputingMilieux_MISCELLANEOUS
Abstract

We present a study on the optical properties of metamaterial layers containing U-shaped resonators with resonances in the near infrared. We show that the description of the optical properties requires taking into account permittivity, permeability, and chirality tensors. The elements of these tensors were tentatively attributed to surface plasmon resonances of the arms, magnetoelectric coupling, and spatial dispersion. We show that measurements of the Mueller matrix of the sample in appropriately chosen conditions allow unambiguous discrimination of the contribution of the different elements of the tensors to the optical properties of the metamaterial. Emphasis is put on the description of transfers of polarization and symmetries among the Mueller matrix elements. The findings of the theoretical part are confirmed by spectroscopic ellipsometric measurements made on this sample. The spectral dispersion of the different elements of permittivity, permeability, and chirality, modeled using oscillators with Lorentzian line shape, allows correct adjustment of measurements.

Published
2012
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16. Adaptive metamaterial antenna using coupled tunable split‐ring resonators

Author

J. de Rosny, A. Ourir, and Camille Jouvaud

Subjects
Physics, Reconfigurable antenna, business.industry, Planar array, law.invention, Radiation pattern, Split-ring resonator, Resonator, Optics, law, Optoelectronics, Dipole antenna, Electrical and Electronic Engineering, Antenna (radio), business, Metamaterial antenna
Abstract

A planar array of coupled split-ring resonators (SRRs) shows many resonances over a broad frequency band at which the structure efficiently emits waves. The mode splitting due to coupling offers an unprecedented way for configuring the radiation pattern of the SRR array. It is shown that specific radiation patterns that include dipolar and quadrupolar oscillation patterns can be constructed by varying the self-impedance of the resonators. Presented is an experimental demonstration based on this concept using electronically tuned SRRs. With this setup, the radiation pattern at a given frequency can be adjusted using a DC voltage command. The proposed structure is an efficient and compact alternative to traditional electronic beam-steering antennas.

Published
2013
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