What is dual band in WLAN?
You’ll hear a lot in the press about the different prominent wireless technologies – some people will be preaching 802.11b, some 802.11a and the others will most likely have moved to trying to sell 802.11g (even though its not yet ratified by the IEEE.) However, what most people don’t actually talk about is the specific band (frequency ranges) that the devices operate in. Some time ago the governments around the world put aside a few parts of the spectrum, termed ISM bands, to be used for Industrial, Scientific and Medical purposes. Essentially they created parts of the Radio Frequency (RF) spectrum that people can utilize without requiring a RF Spectrum License from the relevant authority (the classic example is the use of a microwave oven – it produces RF signals in the 2.4-2.5 GHz band as a by-product of its operations but owners are not required to purchase a RF Spectrum License in order to buy or use one.) Currently there are two predominant ISM bands in use for 802.11 wireless ne
