| Definition: | in a specified plane containing the direction of maximum radiation or the axis of symmetry of a beam or a radiation lobe, angle between two directions (corresponding, for example, to a given fraction of the maximum radiation or to the first minimums) on both sides of this direction or axis
Note 1 to entry: The most generally used fraction is half-power beamwidth.
Note 2 to entry: The term "beamwidth" has different meanings in optical fibre communication (see IEV 731-01-35) and the field of ultrasonics (see IEV 802-01-20).
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