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3 results on '"Olivier Pascal"'

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

Author

Vincent Laquerbe, Thierry Callegari, Laurent Liard, Olivier Pascal, Romain Pascaud, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Département Electronique, Optronique et Signal (DEOS), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Groupe de Recherche Energétique, Plasmas et Hors Equilibre (LAPLACE-GREPHE), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Groupe de Recherche en Electromagnétisme (LAPLACE-GRE), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
Permittivity, Physics::Optics, 02 engineering and technology, 01 natural sciences, Resonance (particle physics), Sub wavelength, Scattering, Optics, Negative Permittivity Spheres, Electrostatics, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Traitement du signal et de l'image, Laplace equations, Analytical models, Electrical and Electronic Engineering, Surface plasmon resonance, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Physics, Resonant frequency, Condensed matter physics, Nonhomogeneous media, business.industry, [SPI.PLASMA]Engineering Sciences [physics]/Plasmas, 020206 networking & telecommunications, Function (mathematics), Surface Plasmon Resonance, Sub-Wavelength Inhomogeneous Resonator, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, SPHERES, business
Abstract

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.

Published
2017
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2. Sierpinski Pyramidal Antenna Loaded With a Cutoff Open-Ended Waveguide

Author

Hervé Aubert, Sami Hebib, Nelson Fonseca, Lionel Ries, Jean-Marc Lopez, Olivier Pascal, 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), Groupe de Recherche en Electromagnétisme (LAPLACE-GRE), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Centre National d'Études Spatiales [Toulouse] (CNES), 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 Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3)

Subjects
Electromagnetic field, Impedance matching, 02 engineering and technology, Sierpinski triangle antennas, law.invention, Optics, law, 0202 electrical engineering, electronic engineering, information engineering, Pyramidal antenna, Cutoff, Electrical and Electronic Engineering, Circular polarization, Computer Science::Information Theory, Ground plane, Physics, business.industry, 020206 networking & telecommunications, multiband applications, 021001 nanoscience & nanotechnology, [SPI.TRON]Engineering Sciences [physics]/Electronics, Sierpinski triangle, cutoff open-ended waveguide, Antenna (radio), 0210 nano-technology, business, Waveguide
Abstract

International audience; A new pyramidal antenna for satellite application is presented. Sierpinski triangle antennas are chosen as radiating elements for their multiband features. The ground plane of the antenna is perforated and loaded with a cutoff open-ended waveguide: this original configuration leads to a good tradeoff between rear radiation and impedance matching. Ideal trap-loads are used to improve the multiband operation of the Sierpinski radiating elements. The antenna radiates circularly polarized electromagnetic fields with a large coverage at multiple operating frequencies. A specific application is given in this paper for a triband operation. Experimental results are reported and discussed.

Published
2009
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3. Use of modified Gaussian beams to optimize shaped reflectors

Author

Olivier Pascal, F. Lemaitre, and P. Schott

Subjects
Physics, business.industry, Aperture, Iterative method, Gaussian, Astrophysics::Instrumentation and Methods for Astrophysics, Reflector (antenna), Physical optics, Numerical integration, Radiation pattern, symbols.namesake, Optics, symbols, Electrical and Electronic Engineering, business, Gaussian beam
Abstract

An efficient electromagnetic method for the optimization of shaped reflectors is presented. The repeated computation of scattering from a reflector surface at each iteration, using the conventional numerical techniques of either physical optics (PO) or aperture integration (AI), usually makes the iterative procedures very inefficient for the synthesis of large reflectors. An asymptotic Gaussian beam (GB) technique has been developed and applied successfully to the fast analysis of reflector antennas of various shapes (Cabbage, H.-T. et al., Proc. IEEE Ant. and Propag. Society URSI Symp., vol. 4, p.2336-9, 1999). This GB technique completely avoids numerical integration and thus makes the analysis very efficient. Our method uses the GB technique, coupled with a local description of the primary source and the reflector. The primary source radiation is expanded using a modified Gaussian beams basis. An antenna pattern calculation is demonstrated on a reflector that is described by local parameters in a novel way. By virtue of these local properties and the use of a steep step descent algorithm, a basic display of antenna pattern optimization is presented to illustrate the effectiveness of our method.

Published
2003
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