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Recent developments in EHF Satcom technologyThe state-of-the-art in EHF Satcom technology is assessed and hardware samples are described. Travelling wave tube amplifiers provide up to 30 percent efficiency for 20 GHz spaceborne operations and up to 20 percent efficiency at 30/44 GHz in ground operations. Solid-state power amplifiers incorporate FET and IMPATT diode technologies for 20-44 GHz transmissions using GaAs FETs and Si or GaAs diodes. Noise is reduced with loss image-enhanced mixers coupled to an IF FET amplifier, resulting ultimately in 6-7 dB noise levels compared to 19 dB gain. Finally, high power varactor upconverters have been developed to provide up to 50 mW RF output at at least 10 percent efficiency at frequencies up to 50 GHz.
Document ID
19840063833
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Okean, H. C.
(LNR Communications, Inc. Hauppauge, NY, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1983
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Accession Number
84A46620
Funding Number(s)
CONTRACT_GRANT: F33575-80-C-1182
CONTRACT_GRANT: NAS3-22494
CONTRACT_GRANT: N00123-79-C-1529
CONTRACT_GRANT: NAS3-22491
Distribution Limits
Public
Copyright
Other

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