half-power beamwidth; 3dB beamwidth
Technical term used in antenna theory, signal processing, and optics to describe the angular width where power is at least half the maximum.
The half-power beamwidth of an antenna is an important indicator of directivity.
ビーム幅 is a broader term for beam width, while 半値電力幅 specifically refers to the half-power (3dB) angular width.
Compound of 半値 (half value), 電力 (electric power), and 幅 (width). A direct calque of the English technical term 'half-power beamwidth'.