the ratio, generally expressed in decibels, of the electromagnetic field due to edge diffraction by an isolated obstacle, to the field which would occur due only to spherical diffraction in the absence of the obstacle Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-05-58
the ratio, generally expressed in decibels, of the electromagnetic field due to edge diffraction by an isolated obstacle, to the field which would occur due only to spherical diffraction in the absence of the obstacle