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Microwave antenna holographyThis microwave holography technique utilizes the Fourier transform relation between the complex far field radiation pattern of an antenna and the complex aperture field distribution. Resulting aperture phase and amplitude distribution data can be used to precisely characterize various crucial performance parameters, including panel alignment, panel shaping, subreflector position, antenna aperture illumination, directivity at various frequencies, and gravity deformation effects. The methodology of data processing presented here was successfully applied to the Deep Space Network (DSN) 34-m beam waveguide antennas. The antenna performance was improved at all operating frequencies by reducing the main reflector mechanical surface rms error to 0.43 mm. At Ka-band (32 GHz), the estimated improvement is 4.1 dB, resulting in an aperture efficiency of 52 percent. The performance improvement was verified by efficiency measurements and additional holographic measurements.
Document ID
19920063438
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Rochblatt, David J. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Seidel, Boris L. (JPL Pasadena, CA, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1992
Publication Information
Publication: IEEE Transactions on Microwave Theory and Techniques
Volume: 40
Issue: 6, Ju
ISSN: 0018-9480
Subject Category
INSTRUMENTATION AND PHOTOGRAPHY
Distribution Limits
Public
Copyright
Other