CONTRIBUTION À L’ÉTUDE ET À LA RÉALISATION D’ÉMETTEURS RADIOFRÉQUENCES COMPACTS. OPTIMISATION DES PERFORMANCES PAR UNE APPROCHE CONJUGUÉE THERMIQUE –ÉLECTROMAGNÉTISME.

摘要

The proposed thesis is about the optimization of miniaturized transmitters modules using the potentials of hybrid multi-layer technologies, such as SoP technology. Firstly, we present a brief state of the art of power transmitters and multi-layer technologies. Then, we present method of experimental characterization for the technology that we have chosen. The development of such compact transmitters requires the best management of the thermal problems associated with the integration. Thus it is suitable to develop high efficiency power amplifiers structures. This development takes into account the current and the future constraints imposed by the development of communication and detection systems. This led us to study and to develop Doherty amplifiers. The achieved results on this type of architecture are similar to the actual state of the art in view of the used transistors. The most cumbersome element in current transmitters is the radiator associated with the power transistor. We show that it is possible to eliminate this radiator using a modified antenna integrated into the module. This antenna is thermally active and is connected to the transistor by a heat sink. This heat sink is placed in weak electromagnetic field zone to minimize its impact on the antenna performance. Finally, we study the electrical and thermal behaviour of the passive circuits used in the integrated module, then we show the advantage of SoP technology in building highly compact transmitters. In this way, we develop original thermal analysis based on infra-red imaging techniques.