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90 results on '"Gelin, Philippe"'

1. Generalized permeability tensor model: application to barium hexaferrite in a remanent state for self-biased circulators

Author

Gelin, Philippe and Queffelec, Patrick

Subjects
Magnetization -- Research, Barium -- Magnetic properties, Permeability -- Evaluation, Ferrites (Magnetic materials) -- Properties, Circulators (Electronics) -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

We describe a theoretical approach for determining the permeability tensor of polycrystalline ferrites regardless of their magnetization state. To take into account both the demagnetizing dynamic fields related to the magnetic domain and grain shapes and the magnetic interactions between adjoining domains and between adjoining grains, we transform the classical Landau-Lifschitz-Gilbert equation into a coupled two-equation system. We introduce statistical distribution laws for both the domain and grain demagnetizing coefficients into the calculation to take the domain and grain shape diversity into account and derive static vectorial quantities such as the internal magnetic dc field and magnetization in each domain that depends on the applied de magnetic field from the Stoner-Wohlfarth hysteresis model. We compare results with those for existing models for various magnetized states. Then we apply the model to predict the permeability tensor behavior of barium hexaferrite thin film, especially in the remanent state, which is of great interest for the design of self-biased Y-junction circulators in the millimeter-wave range. Index Terms--Anisotropic media, ferrites.

Published
2008

2. Effect of domain and grain shapes on the dynamical behavior of polycrystalline ferrites: Application to the initial permeability

Author

Gelin, Philippe, Queffelec, Patrick, and Pennec, Francois Le

Subjects
Polycrystalline semiconductors -- Magnetic properties, Ferrites (Magnetic materials) -- Magnetic properties, Magnetization -- Analysis, Physics
Abstract

A theoretical approach to calculate the permeability tensor of polycrystalline ferrites in various magnetization states, from the completely demagnetized state to saturation is described. Demagnetizing dynamic fields related to the magnetic domain and grain shapes are introduced in the initial equations to describe the interactions between domains in a grain and between grains.

Published
2005

3. A predictive model for the permeability tensor of magnetized heterogeneous materials

Author

Queffelec, Patrick, Bariou, David, and Gelin, Philippe

Subjects
Electromagnetism -- Research, Business, Electronics, Electronics and electrical industries
Abstract

This paper describes a mathematical model enabling the calculation of the effective permeability tensor of heterogeneous magnetic materials set in various magnetization states. The theoretical approach we propose permits to predict the microwave behavior of unsaturated magnetic loaded composites as well as those of unsaturated polycrystalline ferrites. The model gives all the complex components of the permeability tensor in a single calculation phase whatever the magnetization state of the material is. This is useful for the computer-aided design of microwave magnetic devices. The calculation of the effective permeability tensor is carried out from a limited number of parameters: saturation magnetization, anisotropy field, damping factor, external dc field strength, concentration, and shape of the magnetic particles or domains. The model is predictive in the way that the magnetization state of the material is determined from the strength of the external dc magnetic field applied on the material. Index Terms--Magnetic anisotropy, magnetic hysteresis, nonhomogeneous media, permeability.

Published
2005

4. Theoretical and experimental determination of the permeability tensor components of magnetized ferrites at microwave frequencies

Author

Mallegol, Stephane, Queffelec, Patrick, Le Floc'h, Marcel, and Gelin, Philippe

Subjects
Magnetism -- Research, Business, Electronics, Electronics and electrical industries
Abstract

We compare the diagonal [micro] and off-diagonal [kappa] permeability tensor components of magnetized polycrystalline ferrites given by the theoretical model of Gelin and Berthou with experimental ones at microwave frequencies. We used a broad-band and noniterative measurement technique recently developed within our research group. Whatever the ferrite magnetization state is, simulated and measured [micro] and [kappa] points agree well. This study provides an experimental validation of the Gelin--Berthou model. Moreover, by using this characterization method, we show how the measurement of the magnetic properties can be affected by the size of the ferrite sample under test. Index Terms--Anisotropic media, demagnetizing fields, ferrites, permeability, scattering parameters.

Published
2003

5. Extension of the effective medium approximation for determination of the permeability tensor of unsaturated polycrystalline ferrites

Author

Bariou, David, Queffelec, Patrick, Gelin, Philippe, and Le Floc'h, Marcel

Subjects
Anisotropy -- Evaluation, Ferrites (Magnetic materials) -- Evaluation, Permeability -- Evaluation, Business, Electronics, Electronics and electrical industries
Abstract

This paper presents a physical model of the properties of polycrystalline ferrites below magnetic saturation, a common condition in many applications of ferrites in microwave devices. The properties are mainly characterized through the elements of the effective permeability tensor as functions of magnetization state, anisotropy field, and frequency. Partially magnetized states are characterized by a suitable distribution of magnetic domains over orientations. The magnetic domain shapes studied were cylinders and spheres. Homogeneity of the medium is obtained in the effective medium approximation, which allows us to treat heterogeneous magnetic materials as a function of the volume fraction of nonmagnetic matter present in the material. The model gives all the components of the permeability tensor in a single calculation phase. The paper presents results for different partially magnetized states at remanence (with no external field applied) and compares them with empirical formulations of permeability tensor components, in their domain of validity. Index Terms--Anisotropic media, ferrimagnetic materials, ferrites, permeability.

Published
2001

6. Nonreciprocal cell for the broad-band measurement of tensorial permeability of magnetized ferrites: direct problem

Author

Queffelec, Patrick, Le Floc'h, Marcel, and Gelin, Philippe

Subjects
Magnetization -- Research, Ferrites (Magnetic materials) -- Research, Permeability -- Research, Anisotropy -- Research, Waveguides -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

In this paper, a broad-band characterization method for measuring the complex permeability tensor components and complex scalar permittivity of magnetized ferrites is described. The technique is based on the reflection/transmission measurement of a rectangular waveguide partly filled with the ferrite that is to be characterized. The fundamental principle of the measurement consists in using the anisotropy of the material to lead to the nonreciprocity of the device in order to have the same number of measurable parameters (the S-parameters of the cell) for the characteristics we want to determine. Here, we will recall the principle of the mode-matching method used for the electromagnetic analysis of the cell (direct problem). We will bring to the fore the difficulties linked to the determination of the complex propagation constants of the different modes and will present a calculation procedure that makes this determination in a wide-frequency range easier. We will then compare at X-band frequencies (8-12 GHz) the theoretical S-parameters with those measured for ferrites of well-known properties in order to validate the direct problem. The determination of the permittivity and permeability values from the measured parameters (inverse problem) is not addressed here. Index Terms - Anisotropic media, ferrites, microwave measurements, permeability measurement, waveguide discontinuities.

Published
1999

8. FDTD treatment of partially magnetized ferrites with a new permeability tensor model

Author

Monediere, Thierry, Berthou-Pichavant, Karine, Marty, F., Gelin, Philippe, and Jecko, Francoise

Subjects
Finite element method -- Usage, Numerical analysis -- Usage, Ferrites (Magnetic materials) -- Analysis, Electromagnetic interactions -- Analysis, Business, Computers, Electronics, Electronics and electrical industries
Abstract

This paper outlines the finite-difference time-domain (FDTD) treatment of partially magnetized ferrites characterized by a permeability tensor model, which was recently published [15]. Its causal aspect makes this tensor well adapted to time-domain simulations. Validation is demonstrated for a resonant ferrite structure. Numerical and analytical results are compared, showing good agreement. Index Terms - FDTD, ferrite.

Published
1998

9. New consistent model for ferrite permeability tensor with arbitrary magnetization state

Author

Gelin, Philippe and Berthou-Pichavant, Karine

Subjects
Ferrites (Magnetic materials) -- Usage, Circulators (Electronics) -- Models, Time-domain analysis -- Usage, Permeability -- Measurement, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Partially magnetized ferrites play an important role in a large class of microwave devices. For instance, when the optimal design of circulators, which operate with ferrite in the low magnetic field region, and other ferrite devices (phase shifters, isolators etc.) are considered, permeability tensor is required for arbitrary magnetization. The existing models do not simultaneously provide all tensor components, and their validity domain is limited. The proposed model provides integral expressions for all permeability tensor components, which can be treated numerically without difficulties. The physical nature of the model enforces the causal aspect that is required when numerical time-domain methods (such as finite-difference time domain (FDTD), transmission-line matrix (TLM), time-domain finite-element method (TDFEM), etc.) are used. Finally, the comparison with measurements or specific cases, which can be treated by available models, demonstrates the validity of the proposed approach.

Published
1997

10. Wave propagation in heterogeneous anisotropic magnetic materials

Author

Berthou-Pichavant, Karine, Liorzou, Franoise, and Gelin, Philippe

Subjects
Wave propagation -- Analysis, Magnetic materials -- Analysis, Anisotropy -- Analysis, Business, Computers, Electronics, Electronics and electrical industries
Abstract

In order to examine guided wave propagation in unsaturated magnetized materials, it seems reasonable to consider an alternation of layers with antiparallel magnetization in a rectangular waveguide. This approach is coherent with Schlomann's model [1] which considers partially magnetized ferrites as an alternation of antiparallel coaxial cylinders. The finite-difference time-domain (FDTD) method had been used in the case of an homogeneously filled rectangular waveguide. It is adapted here to a guide partially filled with two antiparallel magnetization layers. The modification of the FDTD algorithm at the air/ferrite and ferrite/ferrite interfaces is presented. Results are compared with the ones obtained by a mode-matching technique.

Published
1997

11. Influence of higher order modes on the measurements of complex permittivity and permeability of materials using a microstrip discontinuity

Author

Queffelec, Patrick and Gelin, Philippe

Subjects
Microwave wiring -- Research, Electromagnetism -- Analysis, Broadband transmission -- Measurement, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The accurate electromagnetic analysis of discontinuities in a microstrip device, used for the broad band measurement of complex permittivity and permeability of materials, is presented. This analysis is based on the spectral domain approach together with the mode matching method which consists in the electromagnetic field matching at the discontinuities for each mode of the microstrip line. The study of the influence of higher order modes on the S-parameter measurements enabled us to determine the domain of validity of the transmission-line theory that has been used until now in the processing of the data. The use of the transmission-line theory for the description of the electromagnetic behavior of the cell discontinuities permits in the 45 MHz-14 GHz frequency band the achievement of a good precision (better than 5%) for the results on materials with low electromagnetic characteristics ([Epsilon][prime] 10 and [Mu][prime] < 10). The improvement in high frequencies of the results on materials with greater permittivity and permeability is provided by the calculation of higher order modes (about 10) in the analysis of the microstrip discontinuity.

Published
1996

12. A microstrip device for the broad band simultaneous measurement of complex permeability and permittivity

Author

Queffelec, Patrick, Gelin, Philippe, Gieraltowski, Jacek, and Loaec, Jean

Subjects
Broadband transmission -- Research, Microwave wiring -- Usage, Electromagnetism -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The method presented here aims at determining the complex permeability [[Mu].sup.*] and permittivity of [[Epsilon].sup.*] with an automatic and broad band (45 MHz-18 GHz) system from the reflection-transmission measurement of the S-parameters of a microstrip test device. The complex values [[Epsilon].sup.*] and [[Mu].sup.*] are obtained with the S-parameters from a specific software created within the context of this work. Compared with previous methods, our measurement technique is fast, easy to implement and does not require any calibration test sample or pick-up coils. Lastly, an analysis of the error depending on the method used and the results found with bulk isotropic materials (dielectrics and ferrites) are presented.

Published
1994

15. Self-biased Y-junction circulators using polycrystalline hexaferrite: An accurate electromagnetic analysis

Author

Guennou, Annaig, Queffelec, Patrick, Gelin, Philippe, and Mattei, Jean Luc

Subjects
Physics
Abstract

A theoretical approach for accurately describing the electromagnetic response of a self-biased Y-junction circulator composed of a polycrystalline hexaferrite operating at millimeter wavelengths is presented. The results obtained from the proposed approach are compared in the case of polycrystalline hexaferrite-made circulator operating at remanence.

Published
2006

16. Experimental demonstration of the nonreciprocity of magnetic composite materials for microwave applications

Author

Queffelec, Patrick, Konn, Anne-marie, Gelin, Philippe, Mallegol, Stephane, and Hisatake, K.

Subjects
Microwaves -- Research, Ferromagnetism -- Research, Physics
Abstract

The validation of powders technology for microwave applications, was proved by ferrimagnetic powder loaded composites, which exhibit a nonreciprocal effect. To prove the same, the demonstration in the case of thick ferromagnetic powder loaded layers deposited by silkscreen printing was reproduced.

Published
2003

17. A Broadband Permeameter for 'in situ' Measurements of Rectangular Samples

Author

Salahun, Erwan, Queffelec, Patrick, Le Floc'h, Marcel, and Gelin, Philippe

Subjects
Magnetic materials -- Analysis, Thin films -- Magnetic properties, Microwave devices -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

The measurement method presented here permits the determination of the complex permeability [Mu]* and permittivity [Epsilon]* of rectangular samples of various thicknesses (0.1 [micro]m-1800 [micro]m) over the (130 MHz-7 GHz) frequency band. This method is based on the S-parameters measurements of an asymmetrical stripline containing the sample under test. It does not require any magnetic reference sample. The originality of this method is to reproduce the same environment for the material under test as encountered in microwave devices. The results given by this 'in situ' measurement technique are more useful to design microwave devices than those given by traditional measurement methods. Index Terms--Magnetic materials, permeability measurement, stripline, thin films.

Published
2001

18. New Method for Determining the Permeability Tensor of Magnetized Ferrites in a Wide Frequency Range

Author

Queffelec, Patrick, Le Floc'h, Marcel, and Gelin, Philippe

Subjects
Ferrites (Magnetic materials) -- Heat treatment, Waveguides -- Analysis, Permeability -- Measurement, Business, Computers, Electronics, Electronics and electrical industries
Abstract

To provide a broad-band method for measuring the complex permeability tensor components of magnetized ferrites we have realized a nonreciprocal rectangular waveguide cell. A network analyzer setup is used to measure the scattering parameters of the cell over a wide range of frequencies. The nonreciprocity of the cell permits the determination of the permeability tensor components in a single experimental phase. Complex permittivity and complex components of the permeability tensor are computed from a data-processing program, taking into account higher order modes excited at the cell discontinuities and using a numerical optimization procedure to match calculated and measured values of the S-parameters. We have studied the convergence of the calculated S-parameters as the number of modes taken into account in the calculations. Sensitivity to the input parameters for the optimization algorithm is discussed. A thru-reflect-line calibration in conjunction with a specific sample holder is used to eliminate systematic errors inherent in the S-parameter measurements. Measured complex permeability tensor components data for microwave ferrites are presented at X-band frequencies (8-12 GHz). Experimental results are in good agreement with theoretical results given by the ferromagnetic material theory. Index Terms--Anisotropic media, ferrites, inverse problem, microwave measurements, permeability measurement, waveguides.

Published
2000

22. Extension de la méthode TLM à l'analyse de structures électromagnétiques comportant des milieux dispersifs

Author

Farhat, Arij, Le Maguer, Sandrick, Queffelec, Patrick, Gelin, Philippe, Ney, Michel, Télécom Bretagne, Bibliothèque, Département Micro-Ondes (MO), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192) (Lab-STICC), Université européenne de Bretagne - European University of Brittany (UEB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Département Electronique - UFR Sciences et Techniques - Université de Brest, Université de Brest (UBO), Lab-STICC_TB_MOM_PIM, and Université de Brest (UBO)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université européenne de Bretagne - European University of Brittany (UEB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM)

Subjects
ComputingMilieux_MISCELLANEOUS, [SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

National audience

Published
2009

23. Optimization guidelines for a partially lined semi-anechoic chamber using CEM

Author

Dun, Gwenaël, Rosnarho, Jean-François, Gelin, Philippe, Le Pennec, François, SIEPEL, Direction Recherche et Développement (SIEPEL, Direction Recherche et Développement) (SIEPEL), Département Micro-Ondes (MO), Institut Mines-Télécom [Paris] (IMT)-Télécom Bretagne-Université européenne de Bretagne - European University of Brittany (UEB), Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Lab-STICC_TB_MOM_PIM, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192) (Lab-STICC), Université européenne de Bretagne - European University of Brittany (UEB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université européenne de Bretagne - European University of Brittany (UEB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), and Télécom Bretagne (devenu IMT Atlantique), Ex-Bibliothèque

Subjects
electromagnetic interference, [SPI.TRON] Engineering Sciences [physics]/Electronics, Anechoic chambers (electromagnetic), [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience; Electromagnetic interference measurements (EMI) for EMC qualification of products have to be made in normalized test sites such as an open area test site or a semi-anechoic chamber. Site validation is defined by European and international standards for the frequency range between 30 MHz and 1 GHz. Using Computational ElectroMagnetics (CEM), it is now possible to predict chamber performance. The work presented in this paper is on the optimisation of the dimensions and the surface of ferrite tile absorbers, due to the important impact of these parameters on the cost of an EMC chamber.

Published
2008

24. Circuits agiles à base de cristaux liquides: vers un procédé technologique plus fiable

Author

Bernigaud, Jean-François, Laurent, Paul, Martin, Noham, Quendo, Cédric, Tanné, Gérard, Della, Bernard, Huret, Fabrice, Gelin, Philippe, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192) (Lab-STICC), Université européenne de Bretagne - European University of Brittany (UEB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Département Micro-Ondes (MO), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), and Martin, Noham

Subjects
[SPI.TRON] Engineering Sciences [physics]/Electronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

National audience

Published
2008

27. REMAP for video soundtrack indexing

Author

Gelin, Philippe, Wellekens, Christian J, Gelin, Philippe, and Wellekens, Christian J

Subjects
video signal processing, video soundtrack indexing, multimedia database navigation, wordspotting techniques, fast response, concise processed speech i
Published
1997

28. Coupled Magnetostatic / Electromagnetic Studies of Non-Uniformly Biased Y-Junction Circulator: Application to Transmission Bandwidth Increase

Author

Guennou, Annaïg, Queffelec, Patrick, Gelin, Philippe, Mattei, Jean-Luc, Laboratoire d'Electronique et Systèmes de Télécommunications (LEST), Université de Brest (UBO)-Ecole Nationale Supérieure des Télécommunications de Bretagne-Centre National de la Recherche Scientifique (CNRS), and Queffelec, Patrick

Subjects
[SPI]Engineering Sciences [physics], [SPI] Engineering Sciences [physics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2007

29. Apport des cristaux liquides pour la réalisation de fonctions agiles en fréquence. Application aux filtres DBR

Author

Bernigaud, Jean-François, Laurent, Paul, Martin, Noham, Quendo, Cédric, Tanné, Gérard, Della, Bernard, Huret, Fabrice, Gelin, Philippe, Martin, Noham, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192) (Lab-STICC), Université européenne de Bretagne - European University of Brittany (UEB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Electronique et Systèmes de Télécommunications (LEST), Université de Brest (UBO)-Ecole Nationale Supérieure des Télécommunications de Bretagne-Centre National de la Recherche Scientifique (CNRS), Département Micro-Ondes (MO), and Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)

Subjects
ComputingMilieux_MISCELLANEOUS, [SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

National audience

Published
2007

30. Keyword spotting enhancement for video soundtrack indexing

Author

Gelin, Philippe, Wellekens, Christian J, Gelin, Philippe, and Wellekens, Christian J

Subjects
speech coding, speaker-independent keyword spotting, video soundtrack indexing, multimedia databases, semantic access, frame labeling, word detection, open vocabulary, phonemic representation, off-line process, query time, response speed
Published
1996

31. Keyword spotting for video soundtrack indexing

Author

Gelin, Philippe, Wellekens, Christian J, Gelin, Philippe, and Wellekens, Christian J

Subjects
multimedia computing, query processing, indexing, information retrieval systems, speech recognition, multimedia communication, vocabulary, video sound
Published
1996

32. Microwave Tunable filter using liquid crystal

Author

Bernigaud, Jean-François, Laurent, Paul, Martin, Noham, Quendo, Cédric, Tanné, Gérard, Della, Bernard, Huret, Fabrice, Gelin, Philippe, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192) (Lab-STICC), Université européenne de Bretagne - European University of Brittany (UEB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Electronique et Systèmes de Télécommunications (LEST), Université de Brest (UBO)-Ecole Nationale Supérieure des Télécommunications de Bretagne-Centre National de la Recherche Scientifique (CNRS), Département Micro-Ondes (MO), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), and Martin, Noham

Subjects
[SPI.TRON] Engineering Sciences [physics]/Electronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience

Published
2006

33. Performance prediction of 3 meter semi-anechoic chamber between 30 and 200MHz taking into account the near field effect

Author

Dun, Gwenaël, Rosnarho, Jean-François, Le Pennec, François, Gelin, Philippe, SIEPEL, Direction Recherche et Développement (SIEPEL, Direction Recherche et Développement) (SIEPEL), Laboratoire d'Electronique et Systèmes de Télécommunications (LEST), Université de Brest (UBO)-Ecole Nationale Supérieure des Télécommunications de Bretagne-Centre National de la Recherche Scientifique (CNRS), Département Micro-Ondes (MO), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), and Télécom Bretagne, Bibliothèque

Subjects
[SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience; This paper addresses EMI (ElectroMagnetic Interference) chamber performance in the frequency range between 30 and 200MHz, which is where chambers exhibit their deficiencies. The difference between attenuation in an open area test site (OATS), called Normalized Site Attenuation (NSA) and this same measure in the test chamber gives the performances. The European EN50147-2 (1) and American ANSI C63-4 standards (2) authorize a maximum deviation of  4 dB. Numerical modelling enables us to identify performances and thus optimise the chamber. In this work, we propose a whole new chamber modelling with a boundary condition taking into account the reflectivity of ferrite tile. Also we focus on antenna modelling because of the significant mutual coupling effect in this frequency range, unlike other previous works (3,4,5) which consider electrically small antennas.

Published
2006

34. Electromagnetic modeling of semi-anechoïc chamber between 30 and 200 MHz

Author

Dun, Gwenaël, Rosnarho, Jean-François, Le Pennec, François, Gelin, Philippe, SIEPEL, Direction Recherche et Développement (SIEPEL, Direction Recherche et Développement) (SIEPEL), Département Micro-Ondes (MO), Institut Mines-Télécom [Paris] (IMT)-Télécom Bretagne-Université européenne de Bretagne - European University of Brittany (UEB), Télécom Bretagne, Bibliothèque, and Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)

Subjects
Anechoic Chamber, NSA, OATS, optimization, [SPI.TRON] Engineering Sciences [physics]/Electronics, Ferrite tile reflectivity, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience; This paper addresses EMI (ElectroMagnetic Interference) chamber performance in the frequency range between 30 and 200MHz, which is where chambers exhibit their deficiencies. The difference between attenuation in an open area test site (OATS), called Normalized Site Attenuation (NSA) and this same measure in the test chamber gives the performances. The European EN50147-2 and American ANSI C63-4 standards authorize a maximum deviation of ± 4 dB. Numerical modelling enables us to identify performances and thus optimise the chamber. In this work, we propose a whole new chamber modelling with a boundary condition taking into account the reflectivity of ferrite tile. Also we focus on antenna modelling because of the significant mutual coupling effect in this frequency range, unlike other previous works which consider electrically small antennas.

Published
2006

35. Filtre DBR accordable à base de cristaux liquides

Author

Bernigaud, Jean-François, Martin, Noham, Laurent, Paul, Quendo, Cédric, Tanné, Gérard, Huret, Fabrice, Gelin, Philippe, Martin, Noham, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192) (Lab-STICC), Université européenne de Bretagne - European University of Brittany (UEB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Electronique et Systèmes de Télécommunications (LEST), Université de Brest (UBO)-Ecole Nationale Supérieure des Télécommunications de Bretagne-Centre National de la Recherche Scientifique (CNRS), Département Micro-Ondes (MO), and Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)

Subjects
ComputingMilieux_MISCELLANEOUS, [SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

National audience

Published
2006

36. Tunable Filter using Liquid Crystal

Author

Bernigaud, Jean-François, Martin, Noham, Laurent, Paul, Quendo, Cédric, Tanné, Gérard, Della, Bernard, Huret, Fabrice, Gelin, Philippe, Tanné, Gérard, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192) (Lab-STICC), Université européenne de Bretagne - European University of Brittany (UEB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Lab-STICC_UBO_MOM_DIM, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Département Micro-Ondes (MO), and Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)

Subjects
[SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2006

37. Prédiction des performances d'une chambre semi-anechoide entre 30 et 200MHz : prise en compte des couplages champ proche

Author

Dun, Gwenaël, Rosnarho, Jean-François, Le Pennec, François, Gelin, Philippe, Télécom Bretagne, Bibliothèque, Département Micro-Ondes (MO), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), Laboratoire d'Electronique et Systèmes de Télécommunications (LEST), and Université de Brest (UBO)-Ecole Nationale Supérieure des Télécommunications de Bretagne-Centre National de la Recherche Scientifique (CNRS)

Subjects
Chambre semi-anéchoïque, [SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

National audience; Prédiction des performances d'une chambre semi-anéchoïque entre 30 et 200 MHz : prise en compte des couplages champ proche

Published
2006

38. Design of broadband Ka band spatial power amplifiers

Author

Houbloss, Omar, Bourreau, Daniel, Peden, Alain, Della, Bernard, Jezequel, Raymond, Gelin, Philippe, Département Micro-Ondes (MO), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), Laboratoire d'Electronique et Systèmes de Télécommunications (LEST), Université de Brest (UBO)-Ecole Nationale Supérieure des Télécommunications de Bretagne-Centre National de la Recherche Scientifique (CNRS), Lab-STICC_TB_MOM_PIM, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192) (Lab-STICC), Université européenne de Bretagne - European University of Brittany (UEB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université européenne de Bretagne - European University of Brittany (UEB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), and Université de Brest (UBO)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Coplanar waveguides, MMIC power amplifiers, rectangular waveguides, bridge circuits, waveguide transitions, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience; This paper presents the designs of two Ka band spatial power amplifiers using MMIC circuits and multilayer technology. The design approach is based on quasioptical or spatial power combining techniques in a rectangular waveguide and according to the tray topology. An improved matching waveguide to coplanar transition is presented first with integrated bridges on the coplanar section for even mode cancellation. The transition exhibits very low insertion loss, better than 1 dB over the entire Ka band. The designed spatial amplifiers use two trays with either one MMIC amplifier on each tray (2×1) or two MMICs (2×2). The performances of the 2×1 spatial amplifier are presented showing a gain of 20 dB and a combining efficiency higher than 85% between 31 and 36 GHz. Simulation results of the 2×2 spatial amplifier are also presented showing a good combining efficiency level.

Published
2005

39. Antennes agiles miniatures en technologie mousse/cristaux liquides - caractérisation fonctionnelle

Author

Martin, Noham, Laurent, Paul, Person, Christian, Gelin, Philippe, Huret, Fabrice, Département Micro-Ondes (MO), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), Institut Mines-Télécom [Paris] (IMT)-Télécom Bretagne-Université européenne de Bretagne - European University of Brittany (UEB), and Télécom Bretagne, Bibliothèque

Subjects
[SPI.TRON] Engineering Sciences [physics]/Electronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience; *

Published
2005

40. Field computation in multi-layered lossy media produced by VLF arbitrary current source

Author

Gelin, Philippe, Ney, Michel, Lassudrie Duchesne, Patrick, Le Pennec, François, Le Maguer, Sandrick, Département Micro-Ondes (MO), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), Laboratoire d'Electronique et Systèmes de Télécommunications (LEST), Université de Brest (UBO)-Ecole Nationale Supérieure des Télécommunications de Bretagne-Centre National de la Recherche Scientifique (CNRS), and Télécom Bretagne, Bibliothèque

Subjects
calculation, VLF, Electromagnetic fields, Multi-layers, [SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience; Cette publication analyse comment des sources arbitraires de courants peuvent être utilisées pour calculer les champs électromagnétiques induits à basses fréquences (VLF) dans des milieux stratifiés multi-couches.

Published
2005

42. Conception de transitions guide d'onde ligne coplanaire pour des combineurs de puissance en bande X et Ka

Author

Houbloss, Omar, Della, Bernard, Bourreau, Daniel, Peden, Alain, Gelin, Philippe, Télécom Bretagne, Bibliothèque, Département Micro-Ondes (MO), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), Laboratoire d'Electronique et Systèmes de Télécommunications (LEST), and Université de Brest (UBO)-Ecole Nationale Supérieure des Télécommunications de Bretagne-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience; Conception de transitions guide d'onde ligne coplanaire pour des combineurs de puissance en bande X et Ka

Published
2005

43. Antenne agile en fréquence en technologie mousse utilisant des cristaux liquides nématiques

Author

Martin, Noham, Laurent, Paul, Person, Christian, Gelin, Philippe, Huret, Fabrice, Département Micro-Ondes (MO), Institut Mines-Télécom [Paris] (IMT)-Télécom Bretagne-Université européenne de Bretagne - European University of Brittany (UEB), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), and Télécom Bretagne, Bibliothèque

Subjects
[SPI.TRON] Engineering Sciences [physics]/Electronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience; *

Published
2004

44. Frequency adjustable patch antenna by means of using liquid crystal

Author

Martin, Noham, Laurent, Paul, Person, Christian, Gelin, Philippe, Huret, Fabrice, Département Micro-Ondes (MO), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), Télécom Bretagne, Bibliothèque, and Institut Mines-Télécom [Paris] (IMT)-Télécom Bretagne-Université européenne de Bretagne - European University of Brittany (UEB)

Subjects
[SPI.TRON] Engineering Sciences [physics]/Electronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience; *

Published
2003

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