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Designing ground antennas for maximum G/T : Cassegrain or Gregorian

Show simple item record Imbriale, William A. 2009-01-22T17:20:05Z 2009-01-22T17:20:05Z 2005-05-31
dc.identifier.citation 28th ESA Antenna Workshop on Space Antenna Systems and Technology, Noordwijk, The Netherlands, May 31, 2005. en_US
dc.identifier.clearanceno 05-1119
dc.description.abstract For optimum performance, a ground antenna system must maximize the ratio of received signal to the receiving system noise power, defined as the ratio of antenna gain to system-noise temperature (G/T). The total system noise temperature is the linear combination of the receiver noise temperature (including the feed system losses) and the antenna noise contribution. Hence, for very low noise cryogenic receiver systems, antenna noise-temperature properties are very significant contributors to G/T. It is well known that, for dual reflector systems designed for maximum gain, the gain performance of the antenna system is the same for both Cassegrain and Gregorian configurations. For a 12-meter antenna designed to be part of the large array based Deep Space Network, a Cassegrain configuration designed for maximum G/T at X-band was 0.7 dB higher than the equivalent Gregorian configuration. This study demonstrates that, for maximum GIT, the dual shaped Cassegrain design is always better than the Gregorian. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2005. en_US
dc.subject ground antennas en_US
dc.title Designing ground antennas for maximum G/T : Cassegrain or Gregorian en_US
dc.type Preprint en_US

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