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Wireless & Mobility · Advanced

Front-to-Back Ratio

The ratio of an antenna's gain in its forward direction to its gain in the opposite direction.

Definition

A high front-to-back ratio means little energy radiates behind the antenna. It is important when using directional antennas to avoid interfering with areas behind them. It is expressed in dB.

Exam tip

Directional antennas with high front-to-back ratio reduce rear interference.

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