Les terminaux de télécommunication face à l’environnement radioélectrique

This paper presents the work being carried out in the Emc field for the new telecommunication terminals so that the french telecommunications network should not be disturbed and a good service quality could be maintained even in presence of high level radio frequency ambients.     

Détecteurs HgCdTe pour télécommunication par fibres optiques

This paper deal with the studies and manufacture of HgCdTe detectors for fibre optics telecommunications, operating at 1,3 μm and 1,55 μm either with the Pin structure or with the avalanche mode. Electronic properties of the HgCdTe alloy with the appropriate composition range value, crystal growth methods, means of characterization of the materiel and process technology are described. Performances of the different types of diodes are reported, together with reliability tests, applications and prospects.     

Antennes compactes pour télécommunications: Modélisation et perspectives

Next telecommunication systems involving multimé-dia, internet and spatial technics will need improved performances of radio segment. Antenna stands as a critical component more and more integrated that must be designed and optimized taking into account its close environment. During these last years CNET supported R&D in this field through its cti actions involving university research. Its “Antenna department” performed some original work associated with leat. This paper present a review of some of their recent developments involving compact elements. Main issues associated with small antennas are addressed: numerical modeling, increasing the bandwidth, designing dual polarized elements, reducing the size to the max. At last, a large part of the paper is devoted to the prospects and trends in this field for the next future. The conclusion emphasize higher and higher frequencies, imbrication between antennas, active or optical components and signal processing to converge toward smart antennas.