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10 results on '"Antenna radiation"'

1. Comparison of Antenna Radiation Efficiency Measurement Techniques in Reverberation Chamber Using or Not a Reference Antenna

Author

Jerome Sol, W. Krouka, Elodie Richalot, Philippe Besnier, Francois Sarrazin, Electronique, Systèmes de communication et Microsystèmes (ESYCOM), Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Université Paris-Est Marne-la-Vallée (UPEM)-ESIEE Paris, 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), Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Université Paris-Est Marne-la-Vallée (UPEM)-ESIEE Paris, and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
Computer science, Acoustics, 020208 electrical & electronic engineering, 020206 networking & telecommunications, 02 engineering and technology, Antenna efficiency, [SPI.TRON]Engineering Sciences [physics]/Electronics, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Characterization methods, 0202 electrical engineering, electronic engineering, information engineering, Reference antenna, Antenna (radio), Antenna radiation, Electromagnetic reverberation chamber, Coherence (physics), Computer Science::Information Theory
Abstract

International audience; Antenna characterization using reverberation chamber (RC) has become the new trend in RC measurements. In this work, we compare three antenna characterization methods in RC. These methods are applied in order to determine the radiation efficiency of a patch and a log-periodic antenna. Results are compared and show good coherence. The accuracy of the applied methods is discussed and a solution is proposed in order to enhance the accuracy of reference antenna based methods.

Published
2020
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2. Mechanically reconfigurable radiation pattern slot antenna array feeded by bended sectoral horn and metalized wood splitter

Author

Antoine Jouade, Alexis Martin, Vincent Le Neillon, and Mohamed Himdi, 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), DGA, Direction Générale de l’Armement, 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), and Jonchère, Laurent

Subjects
Reconfigurable radiation patterns, Horn antennas, In-phase, Slot antenna, 02 engineering and technology, Antenna radiation, 7. Clean energy, Radiation pattern, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Optics, Microwave antennas, 0202 electrical engineering, electronic engineering, information engineering, Metallizing, Power distributions, Antenna arrays, Physics, Reduce costs, [INFO.INFO-NI] Computer Science [cs]/Networking and Internet Architecture [cs.NI], business.industry, 020208 electrical & electronic engineering, 020206 networking & telecommunications, [SPI.TRON] Engineering Sciences [physics]/Electronics, Electronic, Optical and Magnetic Materials, [SPI.TRON]Engineering Sciences [physics]/Electronics, Power splitters, High power applications, Mechanical reconfiguration, Splitter, Horn (acoustic), business, Slot antennas H-planes
Abstract

International audience; In this paper, an antenna with reconfigurable radiation pattern in H-plane at 2.45 GHz for high power applications is presented. It is based on a 3-slot array in E-plane covered partially with two mobile metallic flaps in order to reduce their length, and in consequence, they ensure the mechanical reconfiguration pattern in H-plane. The power distribution of the array is ensured with a power splitter in E-plane, and the uniform and in phase field distribution on the slots is ensured with a sectorial horn placed before the splitter. To reduce cost and weight, the power splitter is realized with metalized wood. © 2017, Electromagnetics Academy. All rights reserved.

Published
2017

3. Effect of finite ring radius and antenna radiation on spatial correlation in multiprobe Over-The-Air Tests

Author

Raffaele D'Errico, Mounia Belhabib, Uguen Bernard, 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), 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
Finite ring, Spatial correlation, Device under test, 02 engineering and technology, Antenna radiation, Multiprobes, law.invention, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Optics, law, Spatial correlations, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Dipole antenna, Over the airs, Physics, Ring (mathematics), Half-wavelength dipoles, Directional antenna, Antenna effects, Design for testability, business.industry, 020208 electrical & electronic engineering, 020206 networking & telecommunications, Antenna effect, Correlation errors, Radius, [SPI.TRON]Engineering Sciences [physics]/Electronics, Finite rings, Probes, business
Abstract

International audience; This paper investigates the effect of the radius of a Over-The-Air (OTA) multi-probes ring employing half-wavelength dipoles, on the emulated spatial correlation. The Device Under Test (DUT) is considered randomly oriented in the test zone. Based on the correlation error metric, antenna effect on correlation is evaluated for a Clarke's and single cluster scenarios and OTA two-dimensional rings with up to 32 probes. © 2016 European Association of Antennas and Propagation.

Published
2016
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4. Increasing the radiation efficiency and matching stability of in-body capsule antennas

Author

Ronan Sauleau, Denys Nikolayev, Pavel Karban, Maxim Zhadobov, Institut d'Electronique et de Télécommunications de Rennes (IETR), Centre National de la Recherche Scientifique (CNRS)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-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)-Université de Rennes (UNIV-RENNES)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES), 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 Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-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
Permittivity, Medradio, Materials science, Radiation efficiency, 02 engineering and technology, Efficiency, Antenna radiation, Microstrip, law.invention, Microstrip antenna, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Optics, Narrowband, law, 0202 electrical engineering, electronic engineering, information engineering, Microstrip antennas, Dipole antenna, Miniature antenna, Reflection coefficient, Biotelemetry, ISM bands, Patch antenna, business.industry, 020208 electrical & electronic engineering, 020206 networking & telecommunications, Implantable antennas, Antenna efficiency, [SPI.TRON]Engineering Sciences [physics]/Electronics, Optoelectronics, Biocompatibility, business, Conformal antennas
Abstract

International audience; We propose an approach to increase the operating range and matching stability of in-body ingestible or implantable capsule antennas. It involves using high permittivity biocompatible superstrate on a high-Q narrowband microstrip antenna. In this way, the antenna-body coupling can be significantly reduced, resulting in improved detuning immunity, increased radiation efficiency, and reduced power absorption inside the body. To demonstrate the feasibility of the proposed approach, we designed a mid-ISM band (433 to 434.8) MHz low-profile (85 μm) conformal microstrip antenna loaded with high permittivity ceramic superstrate. We achieved a simulated gain of -20.4 dBi. The radiation efficiency reaches 0.6%, which exceeds the counterparts operating within the same band by at least 3.5 times. The bandwidth is 26 MHz (6%), while the antenna remains matched (S11 < -10 dB) at 434 MHz within a wide range of tissue-equivalent phantoms. To validate the numerical results, we manufactured an antenna prototype and characterized it in terms of reflection coefficient S11. © 2016 European Association of Antennas and Propagation.

Published
2016
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5. Advances in FETI methods for the simulation of multi-source electromagnetic problems

Author

Barka, André, Roux, François-Xavier, André, Cécile, ONERA - The French Aerospace Lab [Toulouse], ONERA, ONERA - The French Aerospace Lab [Palaiseau], and ONERA-Université Paris Saclay (COmUE)

Subjects
FINITE ELEMENT TEARING AND INTERCONNECTING, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [SPI.ELEC] Engineering Sciences [physics]/Electromagnetism, KRYLOV SPACES, ANTENNA ARRAY, ANTENNA RADIATION, ANTENNA RCS, Mathematics::Numerical Analysis
Abstract

International audience; We present the performances of new way of using Krylov type algorithms in FETI methods for solving multi-source electromagnetic problems.

Published
2016

6. Radiation pattern synthesis for monopulse radar applications with a reconfigurable transmitarray antenna

Author

Laurent Dussopt, Antonio Clemente, Philippe Pouliguen, Patrick Potier, Luca Di Palma, Ronan Sauleau, 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), 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), DGA Mission Recherche et Innovation Scientifique (DGA MRIS), DGA, DGA Maîtrise de l'information (DGA.MI), Direction générale de l'Armement (DGA), French Ministry of Defense (Direction Générale de l’Armement), 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
Monopulse radar, Beam steering, Radar equipment, 02 engineering and technology, Directional patterns (antenna), Radiation, Antenna radiation, Radiation pattern, law.invention, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Optics, Microwave antennas, law, Radar antennas, 0202 electrical engineering, electronic engineering, information engineering, Antenna arrays, Electrical and Electronic Engineering, Radar, Reconfigurable array, Physics, business.industry, 020208 electrical & electronic engineering, Electrical engineering, Planar lens, 020206 networking & telecommunications, Reconfigurable computing, Reconfigurable hardware, Beam-steering, [SPI.TRON]Engineering Sciences [physics]/Electronics, Azimuth, Transmit arrays, Antenna (radio), Radiation pattern synthesis, business
Abstract

We investigate here the capabilities of a 400-element reconfigurable transmitarray antenna to synthesize monopulse radiation patterns for radar applications in $X$ -band. The generation of the sum ( $\Sigma )$ and difference ( $\Delta $ ) patterns are demonstrated both theoretically and experimentally for broadside as well as tilted beams in different azimuthal planes. Two different feed configurations have been considered, namely, a single focal source and a four-element focal source configuration. The latter enables the simultaneous generation of a $\Sigma $ - and two $\Delta $ -patterns in orthogonal planes, which is an important advantage for tracking applications with stringent requirements in speed and accuracy.

Published
2016
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7. Impacts of Human Body on Antenna Radiation in Indoor Environments : Numerical Modeling and Experimental Validation

Author

Mohamed Latrach, Zaher Sayegh, Gheorghe Zaharia, Ghaïs El Zein, Fumie Costen, ESEO - Groupe Radio et Hyperfréquences, ESEO-Tech, Université Bretagne Loire (UBL)-Université Bretagne Loire (UBL), School of Computer Science [Manchester], University of Manchester [Manchester], 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 Bretagne Loire (UBL)-École supérieure d'électronique de l'ouest [Angers] (ESEO)-Université Bretagne Loire (UBL)-École supérieure d'électronique de l'ouest [Angers] (ESEO), 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
Computer science, Antenna radiation patterns, business.industry, human body, FDTD, 05 social sciences, Finite-difference time-domain method, 050301 education, Numerical modeling, 020206 networking & telecommunications, 02 engineering and technology, Experimental validation, [SPI.TRON]Engineering Sciences [physics]/Electronics, wireless communications, indoor environments, Wireless communication systems, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Wireless, Radiowave propagation, measurements, Antenna radiation, business, 0503 education
Abstract

International audience; The presence of human body has an important influence on the wireless communication systems in indoor environments. The need of efficient prediction for such coverage becomes essential. This paper present an efficient electromagnetic indoor propagation modeling, taking into account the presence of human body and the nature of materials of the complex environment, based on the Finite-Difference Time-Domain method. Numerical results are compared with measurement results and show a good agreement.

Published
2013

8. New definitions of antenna correlations without channel estimation

Author

Franck Nivole, Christian Brousseau, Stéphane Avrillon, 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), Institut d'Electronique et de Télécommunications de Rennes (IETR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), 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), Centre National de la Recherche Scientifique (CNRS)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-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)-Université de Rennes (UNIV-RENNES)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES), and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
Correlation, 0203 mechanical engineering, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, 020206 networking & telecommunications, 020302 automobile design & engineering, 02 engineering and technology, Topology, Antenna radiation, Polarization (waves), ComputingMilieux_MISCELLANEOUS, Computer Science::Information Theory, Mathematics
Abstract

New correlation coefficients have been defined in order to differentiate multi-antennas system diversities: polarization, magnitude, and phase. Coefficients are linked to antenna radiation functions without channel characteristics and can be calculated in any direction (thetas,φ). The approach used to define these coefficients is explained and several examples of diversity schemes are given. It permits to point out the use of these coefficients to select antenna designs that match channel characteristics. (6 pages)

Published
2007

9. Evaluation of antenna radiation Q using FDTD method

Author

Ala Sharaiha, Kouroch Mahdjoubi, Sylvain Collardey, 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
Computer simulation, business.industry, Antenna radiation patterns, Numerical analysis, Mathematical analysis, Finite-difference time-domain method, 020206 networking & telecommunications, 02 engineering and technology, Radiation, 020210 optoelectronics & photonics, Optics, Q factor, 0202 electrical engineering, electronic engineering, information engineering, Electrical and Electronic Engineering, Antenna (radio), business, Antenna radiation, ComputingMilieux_MISCELLANEOUS, Mathematics
Abstract

A new and simple method is proposed for determining the radiation Q of an antenna using the finite difference time domain (FDTD) method. The numerical results are compared with analytical formulas and good agreement is reported.

Published
2005

10. Discussion on the Definition of the Antenna Radiation Q

Author

Ala Sharaiha, Kouroch Mahdjoubi, Jean-Charles Bolomey, Benoit Derat, Institut d'Electronique et de Télécommunications de Rennes (IETR), Centre National de la Recherche Scientifique (CNRS)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-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)-Université de Rennes (UNIV-RENNES)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES), 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)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Mathematical analysis, Bandwidth (signal processing), 020206 networking & telecommunications, 02 engineering and technology, AC power, Effective radiated power, 021001 nanoscience & nanotechnology, Lower limit, Q factor, Excited state, Quantum mechanics, 0202 electrical engineering, electronic engineering, information engineering, 0210 nano-technology, Antenna radiation, Mathematics
Abstract

According to the classical theories developed by Chu, Wheeler and subsequent authors, there exists a fundamental law which restricts the performances of antennas enclosed in a given volume. This law states that the antenna radiation quality factor Q (proportional to the ratio of time-average non-propagating energy to radiated power) cannot be smaller than the one obtained if only the lowest spherical order mode is excited out of the minimal sphere containing the antenna. However, some authors have recently contradicted this lower limit of Q, exhibiting antennas overcoming this bound. This paper shows that the contradiction mainly relies on a problem of formulation of the quality factor, resulting in a different definition of Q, compared with the classical one. Nevertheless, this raises the question of the interest of using other expressions of Q, depending on the parameters of the problem to be optimized. In fact, it is shown that, if the goal is to obtain the largest matching bandwidth or efficiency, then the Q factor should not be considered at the frequency point of balance between the electric and magnetic stored energies, as it is classically done. It would rather be calculated at the frequency where the reactive power is null (the antenna is matched) which is generally not equivalent to the stored energies balance for complex multi-mode antennas.

Published
2005

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