fanning beam[′fan·iŋ ‚bēm]
Narrow antenna beam which is repeatedly scanned over a limited arc.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A radiant energy beam, such as a radar beam, which sweeps back and forth over a limited arc.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved