Radio Frequency Peripherals
In addition to changing antennas to improve wireless LAN range and performance, wireless
LANs can use various RF peripherals. For example, an RF splitter routes a single RF source
down two separate paths. This is useful when an access point must cover two separate areas.
Bear in mind that each splitter inserts significant attenuation, which reduces the effective range
of the antenna; however, using a splitter might make sense if you must cover two areas with a
single access point.
Wireless LAN amplifiers are available to increase the signal power feeding the antenna. This
improves the range within the beamwidth of the antenna. Instead of replacing the antenna with
one having higher gain (which decreases the beamwidth), an amplifier pushes the radio signals
farther over the entire beamwidth. Amplifiers are available up to 6 watts. In the United States,
FCC licensing is necessary for amplifiers, as well as when you are using RF components that
are different from what is certified with the FCC by the access point and radio card vendor.
Canadian regulations for wireless LAN frequency allocations are nearly identical to U.S.
regulations, but they are governed by Industry Canada. Other countries might have differing
regulations, so consult the appropriate rules before installing accessories or changing antennas
on your wireless LAN.