Département Micro-ondes

%0 Journal Article
%T Magnetic coupling between coplanar filamentary coil antennas with uniform current
%+ Università Campus Bio-Medico di Roma / University Campus Bio-Medico of Rome ( UCBM)
%+ Università degli Studi dell'Aquila [L'Aquila] (UNIVAQ.IT)
%+ Lab-STICC_IMTA_MOM_DIM
%+ Département Micro-Ondes (IMT Atlantique - MO)
%A Parise, Mauro
%A Lombardi, Luigi
%A Ferranti, Francesco
%A Antonini, Giulio
%< avec comité de lecture
%Z 19614
%J IEEE Transactions on Electromagnetic Compatibility
%P .
%8 2019-04
%D 2019
%R 10.1109/TEMC.2019.2904516
%K Flux linkage
%K Loop antennas
%K Magnetic resonance imaging
%K Surface coils
%K Wireless power transfer (WPT)
%Z Engineering Sciences [physics]/ElectronicsJournal articles
%X This letter presents an analytical solution for the mutual inductance of two coplanar filamentary coil antennas. First, the Sommerfeld integral describing the flux linkage between two coplanar turns is converted into a double-integral involving the product of two Bessel functions. Next, analytical integration is performed after replacing the Bessel function that depends on the radii of the coils with its Maclaurin expansion. As a result, the flux linkage between single- or multi-turn pancake coils can be expressed as a combination of spherical Hankel functions. Numerical tests are performed to show the advantages of the proposed approach in terms of accuracy and time cost.
%G English
%L hal-02114078
%U https://hal.archives-ouvertes.fr/hal-02114078
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ CNRS
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_MOM_DIM
%~ IMTA_MO
%~ INSTITUT-TELECOM
%~ PRACOM
%~ LAB-STICC_IMTA

%0 Thesis
%T Unified computational frameworks bridging low to high frequency simulations : fast and high fidelity modelling from brain to radio-frequency scenarios
%+ Département Micro-Ondes (IMT Atlantique - MO)
%+ Lab-STICC_IMTA_MOM_PIM
%A Merlini, Adrien
%N 2019IMTA0130
%I Ecole nationale supérieure Mines-Télécom Atlantique
%Y Francesco Paolo Andriulli
%Z Joe Wiart [Président]
%Z Hélène Roussel [Rapporteur]
%Z Roberto D. Graglia [Rapporteur]
%Z Daniel Bourreau
%Z Kristof Cools
%Z Edouard Demaldent
%8 2019-01-31
%D 2019
%K Computational Electromagnetics
%K Low-Frequency
%K High-Frequency
%K Preconditioning
%K Electromagnétique computationnelle
%K Basses-Fréquences
%K Hautes-Fréquences
%K Préconditionnement
%Z Engineering Sciences [physics]/ElectromagnetismTheses
%X In computational electromagnetics, boundary integral equations are the scheme of choice for solving extremely large forward electromagnetic problems due to their high efficiency. However, two of the most used of these formulations, the electric and combined field integral equations (EFIE and CFIE), suffer from stability issues at low frequency and dense discretization, limiting their applicability at both ends of the spectrum. This thesis focusses on remedying these issues to obtain full-wave solvers stable from low to high frequencies, capable of handling scenarios ranging from electromagnetic compatibility to radar applications. The solutions presented include (i) extending the quasi-Helmholtz (qH) projectors to higher order modeling thus combining stability with high order convergence rates; (ii) leveraging on the qH projectors to numerically stabilize the magnetic field integral equation and obtain a highly accurate and provably resonance-free Calderón-augmented CFIE immune to both of the aforementioned problems; and(iii) introducing a new low frequency and dense discretization stable wire EFIE based on projectors and linear B-splines. In addition, a research axis focused on enhancing Brain Computer Interface (BCIs) with high resolution electromagnetic modeling of the brain has been opened ; a particular attention is dedicated to the inverse problem of electromagnetics and the associated integral equation-based forward problem. The first results of this new line of investigations include the development of one of the first peer-reviewed, freely available framework for end-to-end simulation of BCI experiments.
%X Dans le domaine de l’électromagnétisme computationnel, les équations intégrales de frontière sont très largement utilisées pour résoudre certains des plus grands problèmes directs, grâce à leur grande efficacité. Cependant les équations intégrales du champ électrique et du champ combiné (EFIE et CFIE), deux des formulations les plus employées, souffrent d’instabilités à basse fréquence et à haute discrétisation, ce qui limite leur versatilité. Dans cette thèse différentes approches sont présentées pour obtenir des algorithmes applicables aussi bien à des problèmes de compatibilité électromagnétique qu’à des applications radar. Les solutions présentées incluent (i) l’extension des projecteurs dit quasi-Helmholtz (qH) aux modélisations d’ordre supérieur ; (ii) l’utilisation de ces projecteurs pour stabiliser l’équation intégrale du champ magnétique et former une CFIE extrêmement précise, augmentée par des techniques de type Calderón, qui ne souffre de problèmes ni à basse fréquence ni à haute discrétisation et qui n’est pas sujette aux résonances artificielles ; (iii) le développement d’une EFIE filaire, basée sur des B-splines linéaires et les projecteurs qH, stable aux deux extrémités du spectre. Ces travaux ont été suivis de l’ouverture d’un nouvel axe de recherche visant l’amélioration des techniques de résolution des problèmes inverses en électromagnétique, avec pour objectif principal l’augmentation des performances des interfaces cerveau machine (BCIs). Les premiers résultats obtenus incluent le développement de l’un des premiers systèmes libres de simulation de bout en bout de session de BCI ayant été publié après revue par les pairs.
%G English
%2 https://tel.archives-ouvertes.fr/tel-02136211/document
%2 https://tel.archives-ouvertes.fr/tel-02136211/file/2019IMTA0130_Merlini-Adrien.pdf
%L tel-02136211
%U https://tel.archives-ouvertes.fr/tel-02136211
%~ STAR
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ CNRS
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_MOM_PIM
%~ IMTA_MO
%~ INSTITUT-TELECOM
%~ PRACOM
%~ LAB-STICC_IMTA

%0 Thesis
%T Detection on HF radio transmitters using passive geolocation techniques
%+ Département Micro-Ondes (IMT Atlantique - MO)
%+ Lab-STICC_IMTA_MOM_PIM
%A Jain, Ankit
%N 2019IMTA0128
%I Ecole nationale supérieure Mines-Télécom Atlantique
%Y Michel Ney
%Z Yvon Erhel [Président]
%Z Martine Liénard [Rapporteur]
%Z Valérie Vigneras [Rapporteur]
%Z Denis Le Jeune
%Z Pascal Pagani
%8 2019-01-24
%D 2019
%K HF geolocation
%K Ionosphere
%K Time difference of arrival
%K HF measurements
%K Géolocalisation HF
%K Différence de temps d'arrivée
%K Mesures HF
%Z Engineering Sciences [physics]/Signal and Image processing
%Z Engineering Sciences [physics]/ElectronicsTheses
%X Long-range radio transmission in the HF band can cover large geographical areas using light and mobile equipment. It is therefore well suited for communications during military operations orfor the rapid deployment of an agile communication network during humanitarian operations. In this context, it is important to determine the geographic location of the transmitters by analyzing the electromagnetic communication signals. The aim of the thesis is to develop an alternative, complementary geolocation technique, entitled Time Difference of Arrival (TDoA) that has rarely been studied in the case of ionospheric propagation. As a first step, HF geolocation algorithm based on TDoA is setup and analyzed by parametric software simulations. Simulation results demonstrate that increasing the number of receivers leads to a significant improvement in the geolocation accuracy. In order to study the feasibility of a practical HF geolocation system based on TDoA, multiple remotely controllable HF receivers are designed using software defined radio (SDR) modules and a country wide operational receiver network is deployed in France. A concept of cross-channel sounding along with its mathematical description is proposed to evaluate the propagation duration differences between the signals captured by two distinct receivers. Preliminary experimental results show that it is possible to locate the HF transmitters under favorable conditions with a relative geolocation error ranging from about 0.1 to 10% of the actual ground distance. Data captured during the large scale measurement campaign are analyzed statistically to evaluate the performance of the geolocation algorithm and define parameters that could be considered in an operational approach.
%X La transmission radioélectrique à longue distance dans la bande HF permet de couvrir de vastes zones géographiques à l’aide d’infrastructures légères et mobiles. Elle est donc bien adaptée pour établir des communications lors d’opérations militaires ou pour le déploiement rapide d'un réseau de communication agile lors d'opérations humanitaires. Dans ce contexte, il est important de pouvoir localiser les émetteurs inconnus par l’analyse des signaux électromagnétiques de communication. L’objectif de la thèse est de développer une technique de géolocalisation alternative et complémentaire, intitulée Time Difference of Arrival (TDoA), qui a rarement été étudiée dans le cas de la propagation ionosphérique. Dans un premier temps, l'algorithme de géolocalisation HF basé sur la technique TDoA est adapté et optimisé par des simulations paramétriques. Les résultats de simulation montrent que l'augmentation du nombre de récepteurs entraîne une amélioration significative de la précision de géolocalisation. Afin d'étudier la faisabilité de mise en oeuvre d'un système de géolocalisation HF basé sur la technique TDoA, plusieurs récepteurs HF pilotable à distance ont été développés à partir de modules de radio logicielle, et un réseau national de récepteurs a été déployé en France. Un concept original de sondage de canal croisé est proposé et décrit mathématiquement. Il permet d’évaluer les différences de durée de propagation entre les signaux reçus sur deux récepteurs synchronisés distincts. Les résultats expérimentaux collectés montrent qu'il est possible de localiser les émetteurs HF dans des conditions favorables avec une erreur de géolocalisation relative comprise entre 0,1 et 10% de la distance réelle au sol. Les données collectées lors de la campagne de mesure sont analysées de manière statistique afin d’évaluer la performance de l'algorithme de géolocalisation et de définir les paramètres les plus pertinents à prendre en compte pour déployer cette technique dans une approche opérationnelle.
%G English
%2 https://tel.archives-ouvertes.fr/tel-02133926/document
%2 https://tel.archives-ouvertes.fr/tel-02133926/file/2019IMTA0128_Jain-Ankit.pdf
%L tel-02133926
%U https://tel.archives-ouvertes.fr/tel-02133926
%~ STAR
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ CNRS
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_MOM_PIM
%~ IMTA_MO
%~ INSTITUT-TELECOM
%~ PRACOM
%~ LAB-STICC_IMTA

%0 Journal Article
%T Strong Coupling of Magnons to Microwave Photons in Three-Dimensional Printed Resonators
%+ Département Micro-Ondes (IMT Atlantique - MO)
%+ IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique)
%+ Elliptika
%+ Centre National de la Recherche Scientifique (CNRS)
%A Castel, Vincent
%A Ben Ammar, Sami
%A Manchec, Alexandre
%A Cochet, Gwendal
%A Ben Youssef, Jamal
%< avec comité de lecture
%@ 1949-307X
%J IEEE Magnetics Letters
%I IEEE
%P 1-1
%8 2019-01-15
%D 2019
%Z Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]Journal articles
%G English
%L hal-01982850
%U https://hal-imt.archives-ouvertes.fr/hal-01982850
%~ INSTITUT-TELECOM
%~ CNRS
%~ IMT-ATLANTIQUE
%~ IMTA_MO

%0 Journal Article
%T On the passivity of the quasi-static partial element equivalent circuit method
%+ Lab-STICC_IMTA_MOM_DIM
%+ Département Micro-Ondes (IMT Atlantique - MO)
%+ Università degli Studi dell'Aquila [L'Aquila] (UNIVAQ.IT)
%A Ferranti, Francesco
%A Romano, Daniele
%A Antonini, Giulio
%< avec comité de lecture
%Z 19298
%J International Journal of circuit theory and applications
%P .
%8 2018-12
%D 2018
%R 10.1002/cta.2588
%K Admittance and impedance representations
%K Circuits
%K Descriptor systems
%K Partial element equivalent circuit (PEEC) method
%K Passivity
%Z Engineering Sciences [physics]/ElectronicsJournal articles
%X The partial element equivalent circuit (PEEC) electromagnetic method has attracted a lot of attention for its capability to give a circuit interpretation to Maxwell's equations. The PEEC equivalent circuits are usually connected with terminations such as drivers and receivers in a time‐domain circuit simulator. Passivity is a fundamental property for the time‐domain simulations of circuit models connected to terminations at their electrical ports. Stable, but nonpassive, models can produce unstable systems when connected to other stable, even passive, loads. The so‐called quasi‐static PEEC formulations leads to a descriptor state‐space circuital representation of the electromagnetic phenomena. Multiple state‐space representations are possible. In this paper, we study the passivity property of different quasi‐static PEEC representations in detail. A novel analytical additive decomposition is proposed concerning the admittance formulation, which allows extracting the polynomial part of the transfer function that represents the behavior at infinity in the Laplace domain. This decomposition is discussed from a mathematical and a physical point of view. Such a detailed study for the passivity of quasi‐static PEEC models and the novel analytical decomposition is not available in the literature. Numerical results support the theoretical analysis.
%G English
%L hal-01950621
%U https://hal.archives-ouvertes.fr/hal-01950621
%~ CNRS
%~ UNIV-BREST
%~ UNIV-UBS
%~ INSTITUT-TELECOM
%~ ENIB
%~ LAB-STICC
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_MOM_DIM
%~ IMTA_MO
%~ LAB-STICC_IMTA
%~ PRACOM

%0 Conference Proceedings
%T Dipole Antenna Printed on Paper Substrate for WLAN Applications
%+ Thomson Research (THOMSON RESEARCH)
%+ Département Micro-Ondes (IMT Atlantique - MO)
%A Hine Tong, D. Lo
%A Minard, Ph
%A Person, Christian
%A Coupez, J, Ph
%A Borel, P.
%A Izoard, D.
%< avec comité de lecture
%B 2018 15th European Radar Conference (EuRAD)
%C Madrid, Spain
%I IEEE
%P 457-460
%8 2018-09-26
%D 2018
%K MIMO antenna
%K dipole antenna
%K paper substrate
%K balun
%Z Engineering Sciences [physics]/Electromagnetism
%Z Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
%Z Engineering Sciences [physics]/ElectronicsConference papers
%X The design of a dipole antenna printed on a paper substrate is presented in this paper. The antenna which integrates a compact balun is devoted for dual-band 2.4/5 GHz WLAN applications. The antenna is based on a double-side printed multilayer paper substrate and is fed with a coaxial cable for the testing. The simulated results of the whole structure are also presented in detail and compared with the measured performances.
%G English
%2 https://hal.archives-ouvertes.fr/hal-02114562/document
%2 https://hal.archives-ouvertes.fr/hal-02114562/file/EUMC_2018_TCH_vf.pdf
%L hal-02114562
%U https://hal.archives-ouvertes.fr/hal-02114562
%~ IMT-ATLANTIQUE
%~ IMTA_MO

%0 Conference Proceedings
%T Implementing Wideband Monopole/Dipole Antennas on Paper Substrates
%+ Département Micro-Ondes (IMT Atlantique - MO)
%+ Lab-STICC_IMTA_MOM_DIM
%+ Thomson Research (THOMSON RESEARCH)
%A Person, Christian
%A Nguyen, Duc
%A Coupez, J, Ph
%A Minard, Ph
%A Lohine Tong, D.
%A Borel, P
%A Izoard, D
%< avec comité de lecture
%B 2018 15th European Eurepean Conference (EuRAD)
%C Madrid, Spain
%8 2018-09-26
%D 2018
%R 10.23919/EuRAD.2018.8546518
%K wideband antennas
%K Flexible Printed Circuit
%K paper substrates
%K conformable structure
%K integrated balun
%Z Engineering Sciences [physics]/Electronics
%Z Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
%Z Engineering Sciences [physics]/ElectromagnetismConference papers
%X Advanced internet and multimedia set-top boxes are today massively based on 4*4 MIMO systems, with multi-sub-bands standards (Wifi bands, LTE, Bluetooth,…). Multiple antennas spatially distributed on the plastic casing become therefore a great challenge for cost and performances motivations, thus promoting flexible technology and substrate, for assembling subsystems , under compactness considerations, as well as electrical performances improvement. In this paper, we discuss about the characterisation of Multi-band antennas designed on an ultra-low cost material (a cellulosic substrate, i.e. a paper) with design challenges in terms of radiation efficiency maximization and wideband properties under compactness constraints. Simulation and measurements are proposed to validate the designs.
%G English
%2 https://hal.archives-ouvertes.fr/hal-02114426/document
%2 https://hal.archives-ouvertes.fr/hal-02114426/file/PID5421025%20anten.pdf
%L hal-02114426
%U https://hal.archives-ouvertes.fr/hal-02114426
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ CNRS
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_MOM_DIM
%~ IMTA_MO
%~ INSTITUT-TELECOM
%~ PRACOM
%~ LAB-STICC_IMTA

%0 Conference Paper
%F Oral
%T Characterization of Flex to Printed Circuit Board Interconnections using Insertion Connectors
%+ Département Micro-Ondes (IMT Atlantique - MO)
%+ Lab-STICC_IMTA_MOM_DIM
%+ Thomson Research (THOMSON RESEARCH)
%A Person, Christian
%A Nguyen, Duc
%A Coupez, J, Ph
%A Minard, Ph
%A Lohine Tong, D.
%A Borel, P.
%A Izoard, D
%< avec comité de lecture
%B 2018 13th European Microwave Integrated Circuits Conference (EuMIC)
%C Madrid, France
%I IEEE
%P 377-380
%8 2018-09-23
%D 2018
%K RF interconnection
%K Flexible Printed Circuit
%K paper substrates
%K conformable structure
%Z Engineering Sciences [physics]/Electromagnetism
%Z Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
%Z Engineering Sciences [physics]/ElectronicsConference papers
%X Advanced internet and multimedia set-top boxes are today massively based on 4*4 MIMO systems, with multi-sub-bands standards (WIFI bands, LTE, Bluetooth,…). Interconnections between the numerous access ports of different radio chipsets mounted on a main PCB (Printed Circuit Board) and multiple antennas spatially distributed on the plastic casing become therefore a great challenge for cost and performances motivations. The flex technology, based on well-controlled and low cost process, brings new functionalities and opportunities for assembling subsystems , under compactness considerations, as well as electrical performances improvement. In this paper, we discuss about the characterisation of connectors used for flexible printed circuit to a main PCB interconnections. The choice of the connectors is a critical issue, and must be properly done considering both local ground and signal interconnections constraints. Simulation and measurements are performed up to 15Ghz covering WIFI bands.
%G English
%2 https://hal.archives-ouvertes.fr/hal-02114545/document
%2 https://hal.archives-ouvertes.fr/hal-02114545/file/PID5421021%20interco.pdf
%L hal-02114545
%U https://hal.archives-ouvertes.fr/hal-02114545
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ CNRS
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_MOM_DIM
%~ IMTA_MO
%~ INSTITUT-TELECOM
%~ PRACOM
%~ LAB-STICC_IMTA

%0 Conference Proceedings
%T Micro heat pipe design and fabrication on LTCC
%+ Département Micro-Ondes (IMT Atlantique - MO)
%+ Département Optique (IMT Atlantique - OPT)
%+ Lab-STICC_IMTA_MOM_DIM
%+ Lab-STICC_IMTA_MOM_PIM
%A Tlili, Malika
%A Sinou, Maïna
%A Kärnfelt, Camilla
%A BOURREAU, Daniel
%A Peden, Alain
%< avec comité de lecture
%Z 19151
%( Proceedings ESTC2018: Electronics System-Integration Technology Conference
%B ESTC2018: Electronics System-Integration Technology Conference
%C Dresde, Germany
%P .
%8 2018-09-18
%D 2018
%K Thermal management
%K Sacrifcial volume material (SVM)
%K Low Temperature Co-fired Ceramics (LTCC)
%K Micro heat pipe (MHP)
%Z Engineering Sciences [physics]/ElectronicsConference papers
%X This paper presents work on micro heat pipe (MHP) fabrication in Low Temperature Cofired Ceramics (LTCC) modules for cooling purpose. The MHPs are fabricated in a 10 layer structure using ESL41020 tape. Different fabrication settings have been tested to minimize swelling and groove deformation. The best result is obtained by using fugitive tape, extended firing profile, and hot lamination at 50°C for 5 minutes with 70 bar pressure.
%G English
%L hal-01881235
%U https://hal.archives-ouvertes.fr/hal-01881235
%~ INSTITUT-TELECOM
%~ TELECOM-BRETAGNE
%~ CNRS
%~ UNIV-BREST
%~ UNIV-UBS
%~ ENIB
%~ LAB-STICC
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_MOM_PIM
%~ LAB-STICC_IMTA_MOM_DIM
%~ IMTA_MO
%~ LAB-STICC_IMTA
%~ IMTA_OPT
%~ PRACOM

%0 Conference Proceedings
%T A Design Method of Cognitive Overlay Links for Satellite Communications
%+ Département Micro-Ondes (IMT Atlantique - MO)
%+ Lab-STICC_IMTA_CID_TOMS
%+ Airbus Defence and Space (AIRBUS)
%A Barros Cardoso Da Silva, Luciano
%A Benaddi, Tarik
%A Franck, Laurent
%< avec comité de lecture
%Z 19219
%( Proceedings ASMS 2018: 9th Advanced Satellite Multimedia systems conference
%B ASMS 2018: 9th Advanced Satellite Multimedia systems conference
%C Berlin, Germany
%P .
%8 2018-09-10
%D 2018
%K Satellite communications
%K Cognitive Radio
%K Overlay paradigm
%K Dirty paper coding
%K Trellis precoding
%K Flexible playloads
%Z Engineering Sciences [physics]/ElectronicsConference papers
%X In this paper, we present a method to design cognitive overlay links for satellite communications, in order to allow the primary and the cognitive users to transmit concurrently while using efficiently the available power resources. By means of trellis shaping based dirty paper coding (DPC) and superposition techniques, numerous schemes are investigated in various realistic scenarios, and different tradeoffs between power efficiency vs complexity are made. By simulations, we first show that we are able to design schemes where the primary user bit error rate (BER) is maintained as in the absence of the cognitive user interference. Secondly, thanks to trellis precoding and an appropriate constellation expansion, we show that the BER of the cognitive user can be made within 1dB of corresponding the Gaussian channel BER.
%G English
%L hal-01879094
%U https://hal.archives-ouvertes.fr/hal-01879094
%~ CNRS
%~ UNIV-BREST
%~ UNIV-UBS
%~ INSTITUT-TELECOM
%~ ENIB
%~ LAB-STICC
%~ IMT-ATLANTIQUE
%~ LAB-STICC_IMTA_CID_TOMS
%~ IMTA_MO
%~ LAB-STICC_IMTA
%~ PRACOM