Perun
radial grating
[′rād·ē·əl ′grād·iŋ](electromagnetism)
Conformal wire grating consisting of wires arranged radially in a circular frame, like the spokes of a wagon wheel, and placed inside a circular waveguide to obstruct E waves of zero order while passing the corresponding H waves.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
radial grating
Nonrectangular grating, in which the bearing bars extend radially from a common center and the cross bars have a pattern of concentric circles.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.