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Record 1 of 961
Beam forming networks for mm-wave satellite communications
Author and Affiliation:
Sharon, T. E.(Electromagnetic Sciences, Inc., Norcross, GA, United States)
Abstract: Technology features of a beam forming network (BFN) employing ferrite devices to provide multiple beam antenna pattern control for satellites used in telecommunications are described. The BFN produces the phase and amplitude distribution for each horn in an antenna array, with the number of horns in the array being equal to the number of outputs in the BFN. One configuration involves microwave switches and permits illumination of a single feed horn at a time using ferrite latching circulators that function by reversing the circulation direction. A more flexible version, yielding a variable amplitude distribution across the feed horn array to accommodate changing traffic patterns or serving a TDMA system, includes the capability of forming nulls in the system with a variable phase shifter in the input ports. The antenna scan angles in phased arrays can be limited to 8 deg from center. Acceptable insertion losses have been demonstrated in BFN with hundreds of ports and switching rates as high as 10 kHz.
Publication Date: Aug 01, 1983
Document ID:
19830064782
(Acquired Nov 30, 1995)
Accession Number: 83A46000
Subject Category: COMMUNICATIONS AND RADAR
Document Type: Journal Article
Publication Information: Microwave Journal (ISSN 0026-2897); 26; Aug. 198
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Electromagnetic Sciences, Inc.; Norcross, GA, United States
Description: 7p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: COMMUNICATION NETWORKS; COMMUNICATION SATELLITES; MICROWAVE SWITCHING; MILLIMETER WAVES; MULTIBEAM ANTENNAS; NETWORK CONTROL; ANTENNA FEEDS; ANTENNA RADIATION PATTERNS; HORN ANTENNAS; INSERTION LOSS; PHASED ARRAYS; TRANSMISSION EFFICIENCY
Imprint And Other Notes: Microwave Journal (ISSN 0026-2897), vol. 26, Aug. 1983, p. 105, 106, 108 (4 ff.). NASA-supported research.
Miscellaneous Notes: p. 105, 106, 108 (4 ff.). NASA-supported research
Availability Source: Other Sources
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