ground plane

noun
1.
(in perspective drawing) the theoretical horizontal plane receding from the picture plane to the horizon, beginning at the level of the base line.
2.
Electricity. a ground plate or an underground mesh of radial wires connected to a vertical antenna (ground plane antenna) that is grounded in order to provide suitable radiation characteristics.

Origin:
1825–35

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The ground plane ranges from stiff radial wires to sheet metal discs and cones.
Shrubs soften the transition between wall and ground plane.
The second mast site should be selected to avoid digging cable conduit runs across ground plane radials.
The purpose of the ground plane is to reduce electrostatic coupling to the plasma.
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