Sector antenna

Horizontal and vertical radiation patterns. The antenna radiates a horizontal fan-shaped beam, sharp in the vertical axis so it doesn't spill over into neighboring sectors.

Top of cellular base station tower with sector antennas

An antenna at bottom has bigger mechanical downtilt

A sector antenna is a type of directional microwave antenna with a sector-shaped radiation pattern. The word "sector" is used in the geometric sense; some portion of the circumference of a circle measured in degrees of arc. 60°, 90° and 120° designs are typical, often with a few degrees 'extra' to ensure overlap and mounted in multiples when wider or full-circle coverage is required (see photos below). The largest use of these antennas is as antennas for cell phone base-station sites. They are also used for other types of mobile communications, for example in WiFi networks. They are used for limited-range distances of around 4 to 5 km.

单词	Sector antenna
释义	Sector antenna 英语百科 Sector antenna A sector antenna is a type of directional microwave antenna with a sector-shaped radiation pattern. The word "sector" is used in the geometric sense; some portion of the circumference of a circle measured in degrees of arc. 60°, 90° and 120° designs are typical, often with a few degrees 'extra' to ensure overlap and mounted in multiples when wider or full-circle coverage is required (see photos below). The largest use of these antennas is as antennas for cell phone base-station sites. They are also used for other types of mobile communications, for example in WiFi networks. They are used for limited-range distances of around 4 to 5 km.
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