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Propriétés électromagnétiques de nanofils métalliques magnétiques orientés : effets non-réciproques

Abstract : Microwave devices mostly use ferrite circulators, which need an external magnetic bias. Cost and size of these circulators lead to study various materials in order to replace the ferrites. Among the candidates, irradiated polymer membranes, filled by oriented magnetic metallic nanowires, have already been used in an unbiased non-reciprocal device, which exhibits more than 10 dB insertion loss. Lower insertion loss is required to make efficient nanowired circulators. In this thesis, the nanowired membrane properties, useful for designing, modelling and making non-reciprocal devices, are studied. Contribution of the different loss factors can then be estimated, thus allowing to identify the key loss factor and then to propose solutions to reduce conductor loss, magnetic loss, and dielectric loss in new devices. Device modelling and measurement of these solutions are carried out. The performance improvement can then be quantified. Finally, new nanowired membrane technologies to be explored are suggested, as they could allow achieving the implementation of all the solutions into the same device.
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https://tel.archives-ouvertes.fr/tel-00290836
Contributor : Jean-François Allaeys <>
Submitted on : Thursday, June 26, 2008 - 3:22:51 PM
Last modification on : Monday, October 19, 2020 - 11:06:39 AM
Long-term archiving on: : Friday, May 28, 2010 - 10:52:59 PM

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Jean-François Allaeys. Propriétés électromagnétiques de nanofils métalliques magnétiques orientés : effets non-réciproques. Matière Condensée [cond-mat]. Université Paris Sud - Paris XI, 2007. Français. ⟨tel-00290836⟩

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