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The design of an ultra-low sidelobe offset-fed 1.22m antenna for use in the broadcasting satellite serviceA feed design and reflector geometry were determined for an ultra low sidelobe offset fed 1.22 meter antenna suitable for use in the 12 GHz broadcasting satellite service. Arbitrary constraints used to evaluate the relative merits of the feed horns and range of f/D geometries are: minimum efficiency of 55 percent, -30 dB first sidelobe level (relative to on axis gain), a 0 dBi plateau beyond the near in sidelobe region, and a Chebyshev polynomial based envelope (borrowed from filter theory) for the region from the -3 dB beamwidth points to the 0 dBi plateau region. This envelope is extremely stringent but the results of this research effort indicate that two steps of corrugated feed and a cluster array of small 1 lambda horns do meet the constraints. A set of performance specifications and a mechanical design suitable for a consumer oriented market in the broadcasting satellite service was developed. Costs for production quantities of 10,000 units/yr. are estimated to be around $150.
Document ID
19810019774
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Janky, J. M. (Edutel Communications and Development, Inc. Palo Alto, CA, United States)
Date Acquired
September 4, 2013
Publication Date
June 1, 1981
Subject Category
Communications And Radar
Report/Patent Number
NASA-CR-165368
Accession Number
81N28312
Funding Number(s)
CONTRACT_GRANT: NAS3-22344
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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