Given the desire to integrate a large number of new services in latest generation of hand held devices and in order to meet their dimensional constraints, new concepts of smart antennas are considered to be the subject of many researches. Among several solutions mentioned in the bibliography, the technique of loading the antenna with tunable material is particularly interesting because it combines the effects of miniaturization and tunability. The studies in this thesis focus on the integration of La-Ti-O-N and BST thin films in antenna conception for miniaturization and agility in frequency. A study of dielectric properties (permittivity, loss tangent and tunability) of La-Ti-ON thin films was realized. These properties are found to be depending on the structural characteristics of the thin films, which derived from the nature of the substrate and the deposition conditions. In the mean time, another study for the integration of these materials in radiating structures to achieve agility in frequency was carried out. Demonstrations of miniaturized and reconfigurable antennas based on La-Ti-ON and BST thin films were fabricated and characterized.
