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Wireless & Mobility · Intermediate

Semi-Directional Antenna

An antenna that focuses energy in one general direction, such as patch, panel, and Yagi antennas.

Definition

Semi-directional antennas are used for hallways, short building-to-building links, and high-density venues. They typically provide 6 to 18 dBi gain with moderate beamwidth. They also reduce co-channel interference by limiting coverage.

Example

Patch antennas under stadium seats point up to cover a seating section.

Exam tip

Choose semi-directional antennas to shape coverage in high-density or long narrow areas.

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