Wireless LAN Antennas
Several concepts are important in understanding wireless antennas:
■ Gain—The energy an antenna adds to the RF signal.
■ Directionality—How the radio coverage is distributed.
■ Polarization—The physical orientation the RF element. Cisco Aironet
antennas use vertical polarization.
■ Multipath Distortion—Receiving both direct and reflected signals
arriving from different directions.
■ Effective Isotropic Radiated Power (EIRP)—The AP radio’s effective
transmission power. Includes gain from the antenna and loss from the
antenna’s cable.