Directivity

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

In electromagnetics, directivity is a parameter of an antenna or optical system which measures the degree to which the radiation emitted is concentrated in a single direction. It is the ratio of the radiation intensity in a given direction from the antenna to the radiation intensity averaged over all directions.

Excerpt from the Wikipedia article “Directivity”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Timothy Truckle, CC BY-SA 4.0, via Wikimedia Commons.