Aperture

From International Dictionary of Marine Aids to Navigation
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4-1-315

Aperture (of a directional antenna)

That portion of a plane surface near the antenna, perpendicular to the direction of maximum radiation, through which the major part of the radiation passes.

Reference: I.R.E.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

charge current

Intensity

Illuminance

Energy

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM