Texte remanié de: Th. doct.--Paris 7, 1984. / En appendice, choix de documents. Bibliogr. p. 293-316. Glossaire.

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In practice, the radiation efficiency of antennas is often measured by the anechoic chambers. For this method, it takes plenty time and cost. In order to bring down the measurement costs, another alternative method was proposed and published by H.A. Wheeler in 1959. The Wheeler Cap method can measure the radiation efficiency of the antenna quickly and easily during the design and development stage. It has the many benefits, such as simple construction, easy and fast to implement, lower cost and accurate enough compared to other methods. Moreover, it is a reliable and extensively used method for measuring the antenna’s radiation efficiency. The basic concept about Wheeler’s method is to use the "radiansphere" which is the boundary between the near field and the far field of any small antenna to measure the radiation efficiency of antenna under test. The radiation efficiency is obtained by performing measurement in two steps i.e. measuring the antenna under test (AUT) without and with conducting radiation metal shield. The main objective of this thesis work is to design and construct a Wheeler cap test set-up. This thesis is performed to study a modified Wheeler cap method which is based on constant power loss principle and according to this principle the loss resistance of AUT remains constant whether the Wheeler cap is placed or removed, it means the AUT has zero or finite radiation resistance. Thus, the radiation efficiency can be measured using the return loss magnitude with or without Wheeler cap. The equivalent RLC circuits of AUT in the free space and with a Wheeler cap have been theoretically reviewed and analyzed. At the same time, the mathematical expressions of radiation efficiency were presented in terms of return loss using equivalent RLC circuits. In this thesis, four types of antenna have been selected to find their radiation efficiency by the Wheeler cap method using HFSS software. To compare the simulation and measurement results of radiation efficiency, lossless wire monopole antenna and lossy loop antenna are simulated, fabricated and measured. It is found that the measurement results correlates with the simulation results.

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Ce projet de recherche-action examine l’expérience d’enseignants participant à une communauté d’apprentissage professionnelle (CAP) afin d’améliorer leur enseignement de l’écriture en classe d’immersion française au primaire. Il s’est agi, d’une part, de déterminer si la participation des enseignants à la CAP leur a fourni un encadrement propice pour un tel développement professionnel et, d’autre part, de décrire les démarches entreprises par les participants pour élaborer un plan d’action et en évaluer les effets sur le rendement et la motivation de leurs élèves. Les résultats confirment ce qui a été observé dans plusieurs recherches antérieures : la CAP a fourni un lieu d’échanges et de collaboration propice au développement professionnel, ce qui, en retour, a affecté de façon positive la motivation, l’engagement et le rendement des élèves. Également, les résultats de cette étude mettent en évidence l’importance de s’assurer que certaines conditions soient en place afin qu’une CAP atteigne et maintienne un haut niveau de fonctionnement.

Universiẗat, Habil.-Schr., 2005--Hannover.

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