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Theses

Optimisation d'un isolateur coplanaire à déplacement de champ et ondes magnétostatiques opérant en bande X

Abstract : The microwave isolator is a two-port device with unidirectional transmission, used most often to protect sources from damage from potential power reflections in transmission chains. A previously realized isolator, consisting of an asymmetric coplanar line deposited on a YIG substrate and a lower ground plane on one side, with a vertically applied magnetic polarization, shows a Left-Hand propagation around 10 GHz. This device operates at a frequency close to the gyromagnetic resonance, has a correct isolation, but insertion losses still too important for a commercial application. An evolution of this structure is realized, with two designs of isolators, one of which is an asymmetrical structure with the same characteristic with a width of 1.3mm, and a polarization field of 200mT. This structure shows important performances, with an isolation of -19.1dB and insertion losses around 0.5dB, generated by the appearance of magnetostatic waves around 10GHz. A second structure with two symmetrical slots shows better performance than the single slot structure, with a non-reciprocal effect of almost 28dB, and an isolation of -29.5dB for insertion losses of -1.5dB around 10GHz.
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https://hal-ujm.archives-ouvertes.fr/tel-01385352
Contributor : Eric Verney Connect in order to contact the contributor
Submitted on : Monday, November 15, 2021 - 3:50:52 PM
Last modification on : Tuesday, November 16, 2021 - 3:56:29 AM
Long-term archiving on: : Wednesday, February 16, 2022 - 6:00:51 PM

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  • HAL Id : tel-01385352, version 1

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Ouzer-Nabil Adam. Optimisation d'un isolateur coplanaire à déplacement de champ et ondes magnétostatiques opérant en bande X. Electromagnétisme. Université Jean Monnet de Saint-Étienne, 2016. Français. ⟨tel-01385352⟩

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