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24th European microwave conference, EumA 1994

作者： Etourneau, P. Leveque, P. Jecko, B. I.R.C.O.M. - U.R.A. Au C.N.R.S. N° 356 C.R.E.A.P.E. Parc ESTER Technopôle Limoges Cedex87069 France I.R.C.O.M. - U.R.A. Au C.N.R.S. N° 356 Equipe 'Electromagnétisme' Faculté des Sciences 123 Avenue Albert Thomas Limoges Cedex87 060 France

increasing the substrate thickness of a coaxially fed microstrip antenna reinforces interactions between modes, and provides the antenna with specific characteristics. Then a new working domain, monitored by an empiric law, is defined ensuring a broad band matching. such an antenna shows the same radiation pattern as one running on its fundamental mode. © 1994 iEEE.

关键词： microstrip antennas

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surFAcE imPEDAncE moDELinG oF DEBYE-mEDiA

SURFACE IMPEDANCE MODELING OF DEBYE-MEDIA

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1994 roma international symposium on Electromagnetic compatibility, Emc 1994

作者： reineix, A. Kellali, s. Leveque, Ph. Jecko, B. I.R.C.O.M. U.R.A. C.N.R.S. n° 356 - Equipe "Electromagnetisme" Faculte des Sciences 123 avenue Albert Thomas Limoges87060 Cedex France

ISBN: (纸本)9781509031993

For studying the interactions between a structure situated above a ground and an incident electromagnetic wave, a surface impedance formalism has been developed. This approach has already been developed for taking into account interfaces between vacuum and as soil of characteristics (er,o) with er constant value. in this paper we propose to extend such a formalism to take into account interfaces between vacuum and dispersive media characterized by e(w) where permittivity follows a DEBYE's law. The validation of this formalism is made on various examples. © 1994 iEEE. All rights reserved.

关键词： Vacuum applications

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rADiATion LossEs in THE TimE DomAin TrAnsmission LinE mETHoD

RADIATION LOSSES IN THE TIME DOMAIN TRANSMISSION LINE METHOD

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1994 roma international symposium on Electromagnetic compatibility, Emc 1994

作者： reineix, A. Jecko, B. I.R.C.O.M. U.R.A. C.N.R.S. n° 356 - Equipe "Electromagnetisme" Faculty des Sciences 123 avenue Albert Thomas Limoges87060 Cedex France

ISBN: (纸本)9781509031993

The classical transmission line method only allows to take into account the propagation of a TEm mode, then all pheno.ena of radiation are neglected. As these pheno.ena become important when studying Emc coupling problems, an original formalism is proposed to introduce radiating losses in this method. some example will validate the method and show the versatility of this approach. © 1994 iEEE. All rights reserved.

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FrEQuEncY-DEPEnDEnT FiniTE-DiFFErEncE TimE-DomAin [(FD)(2)TD] FormuLATion APPLiED To FErriTE mATEriAL

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microWAVE AnD oPTicAL TEcHno.oGY LETTErs 1994年第12期7卷 577-579页

作者： mELon, c LEVEQuE, P monEDiErE, T rEinEiX, A JEcKo, F I.R.C.O.M.-U.R.A. No. 356 au C.N.R.S. Faculté des Sciences 123 Avenue Albert Thomas 87 060 Limoges Cedex France

When subjected to a constant magnetic field, ferrites exhibit anisotropic constitutive parameters. This anisotropy can be described in the frequency domain by using a permeability tensor [mu(omega)] instead of the usual scalar permeability. This article introduces a new method to analyze saturated ferrite structures by a FDTD algorithm where the convolution between the permeability tensor [mu(t)] = F-1 ([mu(omega)]) and the magnetic field H(t) = F-1(H(omega)) are to be calculated results are obtained for a two-dimensional problem and are compared with those given by direct differential FDTD algorithm [1] and a mode-matching method [2]. (c) 1994 John Wiley & sons, inc.

关键词： FErriTE FiniTE DiFFErEncE TimE DomAin conVoLuTion

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A new Behaviour of coaxially Fed rectangular microstrip Antennas Printed on Thick substrate

A New Behaviour of Coaxially Fed Rectangular Microstrip Ante...

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European conference on microwave

作者： P. Etourneau Ph. Leveque B. Jecko U.R.A. au C.N.R.S. no 356 Equipe Electromagnetisme Faculté des Sciences I.R.C.O.M. Limoges France I.R.C.O.M. - U.R.A. au C.N.R.S. n° 356 C.R.E.A.P.E. Parc ESTER Technopôle 87069 LIMOGES CEDEX Tel: 55.42.60.50 Fax: 55.42.60.55 Equipe "Electromagnétisme" Faculté des Sciences 123 Avenue Albert Thomas 87 060 LIMOGES CEDEX

关键词： microstrip antennas coaxial components impedance Probes Frequency Antenna feeds Antenna radiation patterns Dielectric substrates Polarization monitoring

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surface impedance modeling of Debye-media

Surface Impedance Modeling of Debye-Media

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Emc'94 roma, international symposium on Electromagnetic compatibility

作者： A. reineix s. Kellali Ph. Leveque B. Jecko I.R.C.O.M. - U.R.A. au C.N.R.S. n° 356 - Equipe "Electromagnétisme" - Faculté des Sciences -123 avenue Albert Thomas - 87060 LIMOGES CEDEX - FRANCE

ISBN: (纸本)9781509031993

For studying the interactions between a structure situated above a ground and an incident electromagnetic wave, a surface impedance formalism has been developed. This approach has already been developed for taking into account interfaces between vacuum and as soil of characteristics (ε r ,σ) with ε Γ constant value. in this paper we propose to extend such a formalism to take into account interfaces between vacuum and dispersive media characterized by ε(ω) where permittivity follows a DEBYE's law. The validation of this formalism is made on various examples.

关键词： impedance surface impedance Dispersion media Time-domain analysis Time-frequency analysis surface waves Permittivity Wire Electromagnetic compatibility

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radiation Losses in the Time Domain Transmission Line method

Radiation Losses in the Time Domain Transmission Line Method

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Emc'94 roma, international symposium on Electromagnetic compatibility

作者： A. reineix B. Jecko I.R.C.O.M. - U.R.A. au C.N.R.S. n° 356 - Equipe ”Electromagnétisme" - Faculté des Sciences -123 avenue Albert Thomas - 87060 LIMOGES CEDEX - FRANCE

ISBN: (纸本)9781509031993

关键词： cables Power transmission lines mathematical models integral equations Elbow Time-domain analysis impedance Wires couplings Electromagnetic compatibility

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cELLuLAr comPLEXEs As sTrucTurED sEmi-simPLiciAL sETs

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international Journal of shape modeling 1994年第2期1卷 191-217页

作者： HErVE ELTEr PAscAL LiEnHArDT I.M.A. — C.N.R. Via De Marini 6 16149 Genova Italy Research fellow — Lavoisier Grant of the French Ministère des Affaires Etrangères. Département d'Informatique S.I.C. (I.R.C.O.M. — U.R.A. C.N.R.S. 356) 40 avenue du Recteur Pineau 86022 Poitiers Cedex France

in geometric modeling, numerous combinatorial structures have been proposed for modeling the topology of subdivisions. often, these structures are deduced from analyses of the topology of cellular subdivisions of E 3 when main combinatorial structures defined in combinatorial topology are simplicial . Here, we present a general framework for the definition of combinatorial structures, for the representation of the topology of triangulable cellular objects. starting from semi-simplicial sets, which are well kno.n structures in combinatorial topology, we define a simple mechanism, inspired by barycentric triangulation , leading to the definition of a wide class of combinatorial cellular complexes. other combinatorial structures are deduced for particular subclasses of cellular complexes, using other mechanisms. our approach is a purely combinatorial one. Advantages and drawbacks are discussed. For instance, relations between these combinatorial structures and geometric objects are deduced from that with semi-simplicial sets. many important topological properties can be computed on these structures. For particular subclasses of cellular complexes, we can deduce equivalent structures, where less information is explicitly represented, decreasing thus the data storage complexity, and, sometimes, the time complexity of algorithms. one of the main drawbacks is the fact that cells of so-defined cellular complexes are always contractible into a vertex, due to the mechanism inspired from barycentric triangulation. relations with other works are also discussed.

关键词： Geometric modeling topology-based modeling cellular complexes simplicial sets semi-simplicial sets generalized maps chains of maps

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suscEPTiBiLiTY oF microsTriP PATcH AnTEnnAs usED in THE sPAcE DomAin To ELEcTromAGnETic PuLsE inTErFErEncEs 10

SUSCEPTIBILITY OF MICROSTRIP PATCH ANTENNAS USED IN THE SPAC...

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10th international Zurich symposium and Technical Exhibition on Electromagnetic compatibility, Emc 1993

作者： Delaveaud, ch. seaux, J.P. Jecko, B. I.R.C.O.M. - U.R. A. au C.N.R.S. n°356 - Equipe "Electromagnétisme" Faculté des Sciences 123 avenue Albert Thomas Limoges87060 Cedex France

ISBN: (纸本)9781509031955

This paper deals with electromagnetic susceptibility of satellites microstrip patch antennas illuminated by electromagnetic pulses such as electrostatic discharges. Two successive methods of calculation have been developped to evaluate the behaviour of an antenna. The first one consists in directly resolving the mAXWELL's curl equations in the time domain using a total-field Finite-Difference computer code. The second one consists in establishing a broadband equivalent circuit where the elements values are analytically calculated. The two methods show interference resonances below the well-kno.n working frequencies of the antenna. measurements carried out in the cnET of Lannion using an EmP simulator confirm the results. © 1993 iEEE. All rights reserved.

关键词： Electromagnetic pulse

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rADiATion cHArAcTErisTics oF A microsTriP TrAVELinG-WAVE AnTEnnA - PoWEr BALAncE

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microWAVE AnD oPTicAL TEcHno.oGY LETTErs 1993年第12期6卷 694-697页

作者： ALAEDDinE, A rEinEiX, A JEcKo, B I.R.C.O.M.–-U.R.A. au C.N.R.S. No. 356 Equipe “Electromagnétisme” Faculté des Sciences 123 avenue Albert Thomas 87060 Limoges Cedex France

The radiation behavior of a microstrip traveling-wave antenna is theoretically analyzed using a time-domain method based on the FDTD. The time evolution of the fields and currents computed by the FDTD can be given in the frequency domain on a large bandwidth using Fourier transforms. Then it is possible to deduce classical parameters as the radiated field, the gain, and the power delivered by the antenna. (c) 1993 John Wiley & sons, inc.

关键词： microsTriP AnTEnnA TrAVELinG-WAVE AnTEnnA FiniTE-DiFFErEncE TimE-DomAin mETHoD

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