Directivity

n. property of being directional (of a microphone or antenna)

In electromagnetics, directivity is a figure of merit for an antenna. It measures the power density an actual antenna radiates in the direction of its strongest emission, relative to the power density radiated by an ideal isotropic radiator antenna radiating the same amount of total power. Mathematically, the directivity is defined as the maximum of the directive gain: where and are the standard spherical coordinates anglesRadiated power density is the power per unit solid angle such that is the total solid angle for a sphere (also the surface area of a unit sphere, similar to being the total angle for a circle and a the perimeter of a unit circle).The denominator, , represents the average radiated power density
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Noun
1. the property of a microphone or antenna of being more sensitive in one direction than in another
(synonym) directionality
(hypernym) radial asymmetry

B: (Fisika) keterarahan; direktivitas
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