NDLI: Design of an offset fed scanning antenna for the shuttle imaging microwave system. [performance prediction parabolic reflectors and microwave antennas for space shuttles

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Design of an offset fed scanning antenna for the shuttle imaging microwave system. [performance prediction parabolic reflectors and microwave antennas for space shuttles

Content Provider	NASA Technical Reports Server (NTRS)
Author	Gustincic, J. J.
Copyright Year	1975
Description	A design study is described for a mechanically scanned offset fed parabolic torus reflector antenna having a 4m x 2m aperture for simultaneous use at eleven frequency channels from UHF to millimeter wavelengths. A design for the antenna is presented utilizing dipole and horn feeds at the low frequencies and a Gregorian aberration correcting subreflector system for feeding the torus at the high frequencies. The results and details of a theroetical study based on geometrical optics performed to evaluate the high frequency design and the results of an experimental study involving a one-tenth scale model for evaluation of the low-frequency behavior are given. Beam efficiencies, antenna patterns, beamwidths and cross polarization levels are presented and these results demonstrate that the antenna concept is viable for the Shuttle Imaging Microwave System requirement.
File Size	1681572
Page Count	64
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19760015199
Archival Resource Key	ark:/13960/t5t776062
Language	English
Publisher Date	1975-04-14
Access Restriction	Open
Subject Keyword	Spacecraft Instrumentation Microwave Antennas Toruses Radar Beams Antenna Design Scale Models Space Shuttles Performance Prediction Polarization Waves Frequency Ranges Parabolic Reflectors Antenna Radiation Patterns Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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