aperture
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- In a directional antenna, the portion of a plane surface very near the antenna normal to the direction of maximum radiant intensity, through which the major part of the radiation passes. 2. In an acoustic device that launches a sound wave, the passageway, determined by the size of a hole in the inelastic material and the wavelength. [After 2196]
ATIS - Cite This Source - This Definition - radiant emittance, radiant energy, radiant intensity, radiant power, responsivity, shielding effectiveness, threshold frequency