coma lobe
coma lobe
[′kō·mə ‚lōb] (electromagnetism)
Side lobe that occurs in the radiation pattern of a microwave antenna when the reflector alone is tilted back and forth to sweep the beam through space because the feed is no longer always at the center of the reflector; used to eliminate the need for a rotary joint in the feed waveguide.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive
Coma produces a large first sidelobe, the coma lobe, which quickly grows to within a few dB of the gain peak.
The F/D ratio of the entire reflector surface is 0.95 for a comparably sized paraboloid, gain at 30 [degrees] falls by more than 2 dB, and the coma lobe is as high as 7 dB down from peak gain.
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