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Wireless & Mobility · Intermediate

Beamwidth

The angle between the half-power (-3 dB) points of an antenna's main lobe.

Definition

Beamwidth is measured both horizontally and vertically. It is defined as the angular width where power is within 3 dB of the peak. Narrow beamwidth antennas have higher gain.

Example

A sector antenna may have 90 degrees horizontal and 10 degrees vertical beamwidth.

Exam tip

Beamwidth uses the -3 dB (half-power) points.

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