Aperture

urn:mrn:iala:dic:4-1-0315

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)

English

charge current

Intensity

Reserve buoyancy

Reflected amplitude

Range (also ρ)

Illuminance

Energy

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