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Auteur / Autrice : François Ziadé
Direction : Eric Bergeault
Type : Thèse de doctorat
Discipline(s) : Électronique et communications
Date : Soutenance en 2008
Etablissement(s) : Paris, ENST

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Résumé

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All measuring device have to be related to a reference named a standard. In each country a reference institute is in charge of its standards: National Laboratory of Metrology (LNM). The Laboratoire National de Métrologie et d’Essais (LNE) is in charge of the French metrology. For most of the LNMs, the reference standard in high frequency power (HF) is constituted by a microcalorimiter and a bolometer mount. This PhD work, done in collaboration between the HF group of LNE and Radiofrequency and Microwave group (RFM) of the TELECOM ParisTech School, aims to study the feasibility of a calculable HF power standard. A calibrating procedure is no more necessary with a calculable power standard since it is only based on physical and mathematical principles. The metrological parameter of a HF power standard is its efficiency h which represents the losses. This PhD work aims to establish a complete electrical model of the standard in order to calculate its efficiency. First, a power standard has been realized in coplanar (CPW) technology with a reflection coefficient matched to 8 GHz. Then, 3D electromagnetic simulations and Multiline TRL measurements have allowed us to establish its complete electrical model which takes into account: the transition between SMA connector and CPW line, the radiation, the propagation constant g and characteristic impedance Zc of the CPW line, the DC block capacitor, the electromagnetic interaction between components. The mean deviation between the calculated h and the h measured by microcalorimeter method is less than 1. 2%. Such a good concordance between calculation and measurement opens the gate to a calculable HF power standard.