Title :
L-band travelling wave tubes amplifiers for navigation satellites
Author :
Ehret, Peter ; Vogt, Helmut ; Peters, Andreas ; Bosch, Ernst
Author_Institution :
Thales Electron Devices, Ulm, Germany
Abstract :
Summary form only given. Based on the upcoming needs in new navigation systems, Thales Electron Devices (TED) performed an upgrade program to extend the performance of its L-band TWT family. In the meantime, up to 250 W of output power can be provided by a single TWT, with efficiencies as high as 63% in saturated operation. The TWTs have been tested against all sensitive parameters and could so far support all modulations schemes, yielding very low values for group delay and group delay stability. To meet the linearity requirements, the tube can be operated either in backoff mode or in combination with a lineariser. This presentation shows the actual performance data of TED´s improved L-band tubes, and demonstrates through the obtained results that L-band TWTAs provide attractive solutions, suited for all navigation systems.
Keywords :
UHF power amplifiers; circuit stability; linearisation techniques; satellite navigation; travelling wave amplifiers; 250 W; 63 percent; TWT efficiency; TWT linearity; back-off mode operation; group delay stability; lineariser; navigation satellites; power L-band TWT amplifiers; travelling wave tubes amplifiers; Digital communication; Electron devices; L-band; Power amplifiers; Power generation; Power system reliability; Radio frequency; Radiofrequency amplifiers; Satellite broadcasting; Satellite navigation systems;
Conference_Titel :
Vacuum Electronics Conference, 2004. IVEC 2004. Fifth IEEE International
Print_ISBN :
0-7803-8261-7
DOI :
10.1109/IVELEC.2004.1316310
