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Your search keyword '"Université de Nantes (UN)-Université de Rennes 1 (UR1)"' showing total 8 results
Start Over Author "Université de Nantes (UN)-Université de Rennes 1 (UR1)" Journal 2017 11th european conference on antennas and propagation (eucap)
8 results on '"Université de Nantes (UN)-Université de Rennes 1 (UR1)"'

1. A multifunction antenna with direct modulation and beam agility

Author

Samir Ouedraogo, Regis Guinvarc'h, Israel Hinostroza, Raphaël Gillard, Sondra, CentraleSupélec, Université Paris-Saclay (COmUE) (SONDRA), ONERA-CentraleSupélec-Université Paris Saclay (COmUE), Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Laboratoire franco-singapourien de recherche en électromagnétisme et radars ( SONDRA ), ONERA-SUPELEC-National University of Singapore ( NUS ) -DSO National Laboratories-CentraleSupélec, Institut d'Electronique et de Télécommunications de Rennes ( IETR ), Université de Nantes ( UN ) -Université de Rennes 1 ( UR1 ), Université de Rennes ( UNIV-RENNES ) -Université de Rennes ( UNIV-RENNES ) -Institut National des Sciences Appliquées - Rennes ( INSA Rennes ) -CentraleSupélec-Centre National de la Recherche Scientifique ( CNRS ), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
Super high frequency, Engineering, horn antenna, Directional antenna, business.industry, [ INFO.INFO-NI ] Computer Science [cs]/Networking and Internet Architecture [cs.NI], Electrical engineering, ComputerApplications_COMPUTERSINOTHERSYSTEMS, 020206 networking & telecommunications, Side looking airborne radar, Slot antenna, 02 engineering and technology, [ SPI.TRON ] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics, slotted waveguide, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Horn antenna, Radar engineering details, multifunction antenna, 0202 electrical engineering, electronic engineering, information engineering, ComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMS, 020201 artificial intelligence & image processing, Antenna (radio), business, Slotted waveguide
Abstract

International audience; An antenna system simultaneously providing a radar function and a secondary communication function with beam agility is proposed. The system is composed of a slotted waveguide (for the communication function) feeding a horn antenna (for the radar function). Direct modulation in four different directions can be obtained for communication provided each radiating slot is equipped with a simple switch. © 2017 IEEE.

Published
2017

2. Analytical study of free-space coupling of THz radiation for a new radioastronomy receiver concept

Author

Luis-Enrique Garcia Munoz, John Anthony Murphy, D. McCarthy, Stefan Malzer, Gottfried H. Dohler, Kerlos Atia Abdalmalak, Daniel Segovia-Vargas, David Gonzalez-Ovejero, Maria-Theresa Schlecht, Heiko B. Weber, Harald G. L. Schwefel, Gabriel Santamaria Botello, Florian Sedlmeir, Institut d'Électronique et des Technologies du numéRique (IETR), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Université de Nantes (UN)-Université de Rennes 1 (UR1)

Subjects
Coupling, Physics, Total internal reflection, business.industry, Cosmic microwave background, Physics::Optics, 020206 networking & telecommunications, 02 engineering and technology, 01 natural sciences, Photon counting, law.invention, 010309 optics, Lens (optics), Optical pumping, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Resonator, Optics, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, business, ComputingMilieux_MISCELLANEOUS, Gaussian beam
Abstract

In this paper, a scheme for coupling free-space THz radiation into a nonlinear whispering-gallery mode (WGM) resonator is presented. The purpose is to detect the weak THz radiation from the cosmic microwave background (CMB) by up-converting the signal into the optical domain via the nonlinearity of the medium. Such high-sensitivity receiver has theoretically shown capabilities towards photon counting at room temperature, however, it is critical to efficiently couple the THz radiation into the resonator. Therefore, by using the Schelkunoff-Waterman method (the so called T-matrix method) we perform an analytical evaluation of two different free-space coupling techniques: a frees-pace Gaussian beam, and a Gaussian beam incident in a silicon lens under total internal reflection. By comparing the excited modes in the resonator, the optimal parameters for each case are given.

Published
2017

3. Characteristic modes optimisation approach to design a wideband electrically small antenna

Author

Sylvain Collardey, Ala Sharaiha, Abdullah Haskou, Hussein Jaafar, Dominique Lemur, Institut d'Électronique et des Technologies du numéRique (IETR), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)

Subjects
0209 industrial biotechnology, Engineering, Differentrial Evolution (DE), Data_CODINGANDINFORMATIONTHEORY, 02 engineering and technology, Antenna tuner, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Electrically small antenna, 020901 industrial engineering & automation, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Omnidirectional antenna, Computer Science::Information Theory, Coaxial antenna, business.industry, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Antenna measurement, Electrically Small Antenna (ESA), Astrophysics::Instrumentation and Methods for Astrophysics, Electrical engineering, 020206 networking & telecommunications, Antenna factor, [SPI.TRON]Engineering Sciences [physics]/Electronics, Antenna efficiency, characteristic modes, Antennas, Antenna (radio), wide band antennas, business
Abstract

International audience; A design methodology based on the combination of the Theory of Characteristic Modes (TCM) with an Optimization Algorithm, to design a wideband Electrically Small Antenna (ESA) is presented. Unlike other design techniques, loads or matching networks are not needed at the input of the antenna. A design example of an Inverted-L Antenna (ILA) is presented to validate the effectiveness of this technique. © 2017 Euraap.

Published
2017

4. Dual-band dual-polarized transmitarrays at Ka-band

Author

Antonio Clemente, Kien Pham, Erwan Fourn, Ronan Sauleau, Fatimata Diaby, Laurent Dussopt, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), 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), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Université de Nantes (UN)-Université de Rennes 1 (UR1)

Subjects
Engineering, Interleaving, business.industry, 020208 electrical & electronic engineering, dual-polarized antenna, Electrical engineering, 020206 networking & telecommunications, 02 engineering and technology, [SPI.TRON]Engineering Sciences [physics]/Electronics, Dual polarized, SATCOM, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Optics, dual-band, Telecommunications link, 0202 electrical engineering, electronic engineering, information engineering, Satellite, Ka band, transmitarray, Multi-band device, business
Abstract

International audience; Transmitarray antennas with dual-band and dual-polarization capabilities are studied here numerically. The antennas are designed based on linearly-polarized unit-cells working at Ka-band for satellite applications. The unit-cells include two printed patches and a connecting via; a 180° phase shift is obtained by rotating one of the patches. The dual-band property is achieved by interleaving unit-cells dedicated to each band, and two different polarizations in each band. The numerical results demonstrate the working principles of dual-band dual-polarized transmitarrays. © 2017 Euraap.

Published
2017

5. Wireless power transfer: Are children more exposed than adults?

Author

Mauro Ettorre, Maxim Zhadobov, Mohsen Koohestani, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Engineering, dosimetry, exposure assessment, Adult male, business.industry, wireless power transfer, 01 natural sciences, [SPI.TRON]Engineering Sciences [physics]/Electronics, 030218 nuclear medicine & medical imaging, Power (physics), Root mean square, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], 03 medical and health sciences, 0302 clinical medicine, 0103 physical sciences, Dosimetry, Wireless power transfer, Whole body, business, Simulation
Abstract

International audience; Aiming at comparing the exposure levels among children and adults, this paper investigates the exposure due to a representative wireless power transfer system in three different human body models, i.e. adult male and female as well as a child. A dosimetry study has been performed to evaluate the exposure levels with respect to the ICNIRP basic restrictions. Differences in terms of dosimetric quantities (E99, J1cm 2, and local and whole body SAR) has been assessed and reported. Maximum allowable input power has been computed for a representative scenario. It has been found that, for the considered scenario, the exposure due to a resonant WPT system in a child is the same or lower than in an adult. Moreover, the impact of the body dimensions is more pronounced for peak RMS values of E99 and J1cm 2 compared to those obtained for SAR10g and SARwb· J1cm 2 is found to be the most restrictive dosimetric quantity for both the child and adults. © 2017 Euraap.

Published
2017

6. Analysis and design of a continuous parallel plate waveguide multiple beam lens antenna at Ku-band

Author

Etienne Girard, Herve Legay, Ronan Sauleau, Nelson J. G. Fonseca, Francois Doucet, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Université de Nantes (UN)-Université de Rennes 1 (UR1)

Subjects
0301 basic medicine, Engineering, Phase (waves), Physics::Optics, geometrical optics, 02 engineering and technology, Radiation, Ku band, law.invention, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], 03 medical and health sciences, Optics, law, 0202 electrical engineering, electronic engineering, information engineering, antenna design, Ideal (set theory), ray tracing, business.industry, constrained lens, 020206 networking & telecommunications, Parallel plate, [SPI.TRON]Engineering Sciences [physics]/Electronics, Lens (optics), 030104 developmental biology, beamformer, linear array, line source, Ray tracing (graphics), business, parallel plate waveguide, Waveguide
Abstract

International audience; This paper presents the description and analysis of a continuous parallel plate waveguide (PPW) lens-like beamformer. The main design parameters of the continuous delay lens are defined starting from an ideal bifocal constrained lens. A dedicated ray tracing analysis tool is developed to better describe propagation effects in the delay lens and provide more insight on phase aberrations versus pointing angle. Numerical results of a specific design at Ku-band are reported by comparing radiation patterns obtained with the ray tracing tool and a full-wave method. These results are also compared to the ideal bifocal constrained lens design. © 2017 Euraap.

Published
2017

7. Long slot array for wireless power transmission

Author

Mauro Ettorre, Anthony Grbic, Waleed Alomar, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
Power transmission, Engineering, retrodirective antennas, Directional antenna, business.industry, Bandwidth (signal processing), Electrical engineering, 020206 networking & telecommunications, Field of view, Slot antenna, 02 engineering and technology, [SPI.TRON]Engineering Sciences [physics]/Electronics, law.invention, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], law, 0202 electrical engineering, electronic engineering, information engineering, wideband arrays, Wireless, Wireless power transfer, Dipole antenna, business
Abstract

International audience; Retrodirective antennas used for radiative wireless power transfer (WPT) are typically resonant and exhibit strong backscatter, a limited field of view and small bandwidth. These limitations are here overcome by using an array of long slots fed by parallel plate waveguides (PPWs). It is shown that the array can collect the total power impinging from a remote source over a large field of view and bandwidth. The conclusions arrived at for the infinite case are extended to the finite case through full-wave simulations. © 2017 Euraap.

Published
2017

8. Flexible and conformal printed monopoles for reconfigurable antennas

Author

Mohamed Himdi, Asmae Hachi, Hassan Lebbar, Laboratoire d’Electronique Quantique [USTHB - Alger] (LEQ), Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger] (USTHB), Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
Reconfigurable, Monopole, High Energy Physics::Lattice, Conformal antenna, Random wire antenna, 02 engineering and technology, law.invention, Radiation pattern, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Microstrip antenna, Optics, law, Wire, 0202 electrical engineering, electronic engineering, information engineering, Dipole antenna, Helical antenna, Monopole antenna, Computer Science::Information Theory, Physics, Reconfigurable antenna, Conformal, business.industry, 020208 electrical & electronic engineering, 020206 networking & telecommunications, Radiation control, [SPI.TRON]Engineering Sciences [physics]/Electronics, Antenna, Disk, business, Flexible
Abstract

International audience; This paper presents the development and design of flexible and conformai printed monopoles for reconfigurable antennas. The main objective is to control the level of radiation in broadside antenna from zero to a maximum by changing the curvature of printed board. Two printed antenna types are considered: thin wire and disk monopole. In the further, with curving radius R increasing, the classical null on the broadside radiation pattern disappears gradually for both wire and disk. Increasing the curvature radius of conformal flexible antenna, and keeping all other parameter's value, wire monopole antenna become mismatched while the disk monopole antenna remains matched for all radius of curvature. The simulated results of various monopoles are compared successfully with measurements. © 2017 Euraap.

Published
2017

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