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Ultra Small Aperture Terminal for Ka-Band SATCOMAn ultra small aperture terminal (USAT) at Ka-band frequency has been developed by Lewis Research Center (LeRC) for data rates up to 1.5 Mbps in the transmit mode and 40 Mbps in receive mode. The terminal consists of a 35 cm diameter offset-fed parabolic antenna which is attached to a solid state power amplifier and low noise amplifier. A single down converter is used to convert the Ka-band frequency to 70 MHz intermediate frequency (IF). A variable rate (9.6 Kbps to 10 Mbps) commercial modem with a standard RS-449/RS-232 interface is used to provide point-to-point digital services. The terminal has been demonstrated numerous times using the Advanced Communications Technology Satellite (ACTS) and the 4.5 in Link Evaluation Terminal (LET) in Cleveland. A conceptual design for an advanced terminal has also been developed. This advanced USAT utilizes Microwave Monolithic Integrated Circuit (MMIC) and flat plate array technologies. This terminal will be self contained in a single package which will include a 1 watt solid state amplifier (SSPA), low noise amplifier (LNA) and a modem card located behind the aperture of the array. The advanced USAT will be light weight, transportable, low cost and easy to point to the satellite. This paper will introduce designs for the reflector based and array based USAT's.
Document ID
19980000109
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Acosta, Roberto (NASA Lewis Research Center Cleveland, OH United States)
Reinhart, Richard (NASA Lewis Research Center Cleveland, OH United States)
Lee, Richard (NASA Lewis Research Center Cleveland, OH United States)
Simons, Rainee (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1997
Subject Category
Communications And Radar
Report/Patent Number
E-10894
NAS 1.15:113126
NASA-TM-113126
Meeting Information
Meeting: Wireless and Microwave Technology 1997 Conference and Exposition
Location: Chantilly, VA
Country: United States
Start Date: October 6, 1997
End Date: October 10, 1997
Funding Number(s)
PROJECT: RTOP 315-90-2C
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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