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Directional – Refers to the antenna coverage pattern. A directional antenna focuses its lobe or radiated energy
in a particular direction. In general, as the gain of a directional antenna increases, the radiating beamwidth or
lobe decreases. This design increases the transmitted power and communication distance in a specific direction
at the expense of uniform coverage, as compared to an omnidirectional antenna. A directional antenna must be
"aimed" at the intended coverage zone.
Gain – Expressed in dBi, indicates the relative increase in radiated power over an isotropic point radiating
source with a reference gain of 1.0.
Each 3 dB increment in power effectively doubles the radiated energy. For example, an antenna with a gain of
9 dBi
increases the transmit power 8 times more than an isotropic point radiating source.
12.5 mW = 11 dBm
11 dBm + 9dBi = 20 dBm
20 dBm = 100 mW
100mw/12.5 mW = 8 times more power
E-Plane graph – The elevation plane graph shows the radiated antenna coverage pattern as a vertical cross
section - as if looking directly at the antenna from the side.
H-Plane graph – The horizontal plane graph shows the radiated antenna coverage pattern as a horizontal cross
section - as if looking directly at the antenna from above.
Avaya WLAN Series 2332 Access Point Installation Guide
External Antennas 123
For example:
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