equisignal surface

equisignal surface

[¦e·kwə¦sig·nəl ‚sər·fəs]
(electromagnetism)
Surface around an antenna formed by all points at which, for transmission, the field strength (usually measured in volts per meter) is constant.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.