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I. Chapitre, Application des surfaces haute impédancè a la réalisation d'antennesàantennesà large bande passante

. Latroisì-emé-etape-consiste, a partir des motifsélémentairesmotifsélémentaires ainsi dimensionnés, ` a construire un diagramme de phase « large bande ». Celui-ci correspond au recouvrement optimal des bandes CMA de chaque rangée de motifs. Dans le cas de la spirale, la phase du coefficient de réflexion reste comprise entre deux valeurs limites, pp.120-120

L. Inclan-sanchez, Dans notre cas, les motifs sont radiaux et progressifs Du centre vers la périphérie chaque sous-bande de la spirale, définie par un anneau de rayonnement , se retrouve dans une bande CMA ou quasi-CMA de la structure Ce caractère est maintenu sur toute la bande de fréquences de fonctionnement de la spirale en s'assurant que la progression et les dimensions des motifs permettent le recouvrement des différentes bandes CMA. La figure IV.5 illustre la méthodologie proposée. [1] E. Rajo-Iglesias Mutual coupling reduction in patch antenna arrays by using a planar ebg structure and a multilayer dielectric substrate, IEEE Transactions on Antennas and Propagation, vol.56, issue.6, pp.1648-1655, 2008.

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M. Publications, F. Grelier, A. C. Linot, X. Lepage, M. Begaud et al., Analytical methods for AMC and EBG characterisations, META'10, 2nd International Conference on Metamaterials, Photonic Crystals and Plasmonics, pp.221-224, 2010.

:. C. Colloque-national-avec-comité-de-lecture, M. Djoma, X. Grelier, A. C. Begaud, S. Lepage et al., Méthode de Dimensionnement d'une Surface Haute Impédance compacte, 17 ièmes Journées Nationales Microondes, 2011.

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S. Conférence, Journées antennes non standard

G. Ondes, Groupe Antennes Réseaux TLB Caractérisation de surface hautes impédances " , présentation orale

C. Workshop and . Métamatériaux, ApplicationàApplicationà la miniaturisation d'antennesàantennesà très large bande passante " , présentation orale

S. De-la, 35 II.13 CircuitéquivalentCircuitéquivalent de la structure chargée périodiquement 35 II.14 CircuitéquivalentCircuitéquivalent de la structure chargée périodiquement, II.12 Configuration 38 II.17 Comparaison des résultats : approche analytique et expérimentale . . . . . . . 39 II.18 Répartition des champsélectromagnétiqueschampsélectromagnétiques : dans une ligne micro-ruban (a), p.39
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.. Cartographie-de-rayonnement-en-site, 49 III.7 Distribution du courant sur la spirale en espace librè a f=2, p.50

Z. Densité-de, 51 III 52 III.11Adaptation de la spirale : réflecteur, 53 III.14Cartographie des diagrammes en azimut pour h t = ? 1GHz, p.54

5. Du and C. , 55 III.17Comparaison de la densité d'´ energié electriquè a f=5GHz 56 III.18Comparaison de la densité d'´ energié electriquè a f=6 56 III.19Diagramme de phase analytique : cas, 59 III.23Cartographie des diagrammes en azimut pour h t = ? 1GHz, p.59

S. De-la, 66 IV.2 Evolution de ?f /f 0 et de ? m /P pour h = 2mm et ? r = 2 67 IV.3 Evolution de ?f, IV.1 Configuration, p.70

.. Plan-en-coupe-de-l-'antenne, V. , V. Entre-réf, and V. V03, 74 IV 76 IV.14Polarisation principale : comparaison entre Réf, 75 IV.13Adaptation : comparaison entre Réf., V03 V03 78 IV.17Cartographie des diagrammes en azimut : V03 78 IV.19Photographies des configurations V03 et 79 IV.21Polarisation principale : comparaison entre Réf. et V10 . . . . . . . . . . . . . . 80 IV.22Polarisation croisée : comparaison entre Réf. et V10 . . . . . . . . . . . . . . . 80 IV.23Cartographie des diagrammes en azimut, p.81