Noun
the property of a microphone or antenna of being more sensitive in one direction than in another
the quality of being directive
Source: WordNetthe antenna received signals with no directivity Source: Internet
Above and below the ends of the more or less rectangular ribbon, there is less audible output due to phase cancellation, but the precise amount of directivity depends on ribbon length. Source: Internet
Clearly then, sensitivity does not correlate precisely with efficiency, as it also depends on the directivity of the driver being tested and the acoustic environment in front of the actual loudspeaker. Source: Internet
Reciprocity justifies taking the properties of a receiving antenna, such as efficiency, directivity, and gain, to be those of that antenna when used for transmission. Source: Internet
Directive gain or directivity is a different measure which does not take an antenna's electrical efficiency into account. Source: Internet
That is, : An isotropic antenna, meaning one with the same radiation intensity in all directions, therefore has directivity 1 in all directions independently of its efficiency. Source: Internet