公开(公告)号：EP3618306A1

公开(公告)日：2020-03-04

申请号：EP19192637.7

申请日：2019-08-20

申请人： Space Systems / Loral LLC

发明人： TURGEON, Ghislain ,  GALLAGHER, Vijaya

IPC分类号： H04B7/185 ,  H04B7/204 ,  H04B10/118 ,  H04J14/02

摘要： A system described herein includes a ground based gateway subsystem configured to transmit an RF feeder uplink beam to a satellite, and a space based subsystem of the satellite configured to receive the RF feeder uplink beam (602) and produce in dependence thereon an optical ISL beam that is transmitted to another satellite (618). The ground based gateway subsystem can include a ground based beamformer used to produce the RF feeder uplink beam. The optical ISL beam, produced by the space based subsystem and transmitted to the other satellite, can comprise a wavelength division multiplexed optical signal (614) having RF frequencies within a same specified RF frequency range within which the other satellite is configured to transmit a plurality of RF service downlink beams, thereby eliminating any need for the other satellite to perform any frequency conversions when producing the plurality of RF service downlink beams in dependence on the optical ISL beam.

公开(公告)号：EP3618271A1

公开(公告)日：2020-03-04

申请号：EP19192648.4

申请日：2019-08-20

申请人： Space Systems / Loral LLC

发明人： TABATABAEI, Seyed ,  SOWERS, Jim ,  TURGEON, Ghislain

IPC分类号： H03F1/02 ,  H03F3/195 ,  H03F3/24

摘要： A solid state power amplifier uses a Doherty power amplifier that can be implemented as a monolithic microwave integrated circuit. By adjusting the DC bias (923; 933) of the amplifying stages (903a, 903b; 913a, 913b) in each branch of the Doherty amplifier, the output power, linearity, and DC power can be adjusted to provide a specified output, where the specification for the output can include the maintaining of desired DC power and linearity. The Doherty power amplifier can be used in a satellite payload or other application utilizing solid state power amplifiers, while providing the proper amount of RF output power and DC power. A single amplifier can have its bias levels adjusted for different output levels, helping to minimize the number of designs that are required for a given satellite payload, reducing the variety of parts in a satellite payload.