Antennae have a variety of properties that define their operation and performance characteristics.
Frequency: Each antenna is tuned to a specific frequency by virtue of its size. You must match the frequency of the radio with the size of the antenna.
Power: Antennae are rated with a maximum power capacity (in terms of watts). Note, however, that given the relatively small power output of a typical WLAN radio, this is hardly ever a consideration. Most antennae are rated to withstand several watts of power, whereas most WLAN applications operate in the 30-100 milliwatt (mW) range.
Direction: Each antenna shapes the energy field in a particular direction. This pattern is often plotted in multiple dimensions to help visualize ...