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abstraction > mathematical concept > number > quantity > angle > half-power beamwidth
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half-power beamwidth comparison table
Subject has acronym is a kind of has definition
angle quantity 
half-power beamwidthHPBWangleThe angle across the main lobe of an antenna pattern between the two directions where the sensitivity of the antenna is half the value at the center of the lobe. This is the nominal resolving power of the antenna system.

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