Alvarion BreezeNET DS.11 User Manual page 85

Appendix B. Radio Signal Propagation
Figure A-4. Top View
Directional Antenna
Radiates and receives most of the signal power in one direction. The following
diagram shows the radiation pattern of a directional antenna with its side lobes in
polar form:
Figure A-5. Radiation Pattern of Directional Antenna
Antenna Beamwidth
The directiveness of a directional antenna. Defined as the angle between two half-
power (-3 dB) points on either side of the main lobe of radiation.
BreezeNET BU-DS.11/RB-DS.11 A-5 User's Guide