free-space radiation pattern

free-space radiation pattern

[′frē ‚spās rād·ē′ā·shən ‚pad·ərn]
(electromagnetism)
Radiation pattern that an antenna would have if it were in free space where there is nothing to reflect, refract, or absorb the radiated waves.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.