Sectoral Antenna sometimes called the Antenna Patch Panel is basically not much different with omni antenna. Typically used for connection to the Access Point Point-to-Multi-Point (P2MP). Generally sectoral antenna has vertical polarization, some of which also has a horizontal polarization.
Sectoral Antenna reinforcement generally have higher than about 10-19 dBi omni antenna. Very good to provide service in areas within a distance of 6-8 km. Strengthening of sectoral antenna height is usually in compensation to the width of a narrow radiation pattern of 45-180 degrees. Clearly, in the service area that can become more narrow, and this is very profitable.
In the figure below show the sectoral antenna radiation pattern. In general, more radiation antenna to the antenna face, not a lot of radiation behind the antenna sector. Radiation vertical pieces do not vary much with omni antenna.
Sectoral Antenna usually put on top of a tall tower, therefore, usually on tilt a bit to provide services to areas underneath.
Ref :
http://opensource.telkomspeedy.com/wiki/index.php/Antenna_Sectoral
http://en.wikipedia.org/wiki/Sector_antenna
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