The IT Stuff

WLAN uses the radio waves at the Physical layers
WLAN use CSMA/CA(collision Avoidance) for Media Access
LAN use CSMA/CD(collision Detection) for Media Access
WLAN use Two way radio (half duplex ) for communication.
WLAN have the following problems

Coverage Probelms
Interference
Noise

To Share bandwidth Access point are used in WLAN instead of Ethernet Hub in LAN
WLANs must meet country specific RF regulation [...]

WiMax (802.16e) is a newer standard of wireless networking designed to provide the last mile of high speed internet access to the end user.
WiMax was designed to provide (MAN) Metropolitan Area Access, to homes and businesses.
WiMax provides up to 72 Mbit/s symmetric broadband speed without the need for cables
WiMAX  enabling the delivery of last [...]

WiMAx is the new wireless broadband with a range of up to 80km, with a bandwith of up to 75bps.  It is the successor to Wi-Fi.WiMAX is a wireless digital communications system, also known as IEEE 802.16, that is intended for wireless “metropolitan area networks”.   WiMAX can provide broadband wireless access (BWA) up to 30 [...]

In the 802.11n draft, the first requirement is to support an OFDM implementation that improves upon the one employed in the 802.11a/g standards, using a higher maximum code rate and slightly wider bandwidth.
When  every possible option enabled, 802.11n could offer raw data rates up to 600 Mbps. In 2006, for example, most draft-n WLAN hardware [...]

Dual band (also known as dual-band or dualband) refers to functionality that allows a device  to support two frequency bands.
Dual-band technology allows you to operate in both the 2.4 and 5 GHz radio bands simultaneously, so it effectively doubles your available wireless bandwidth.
You could set up your network to handle time-sensitive gaming, music or video [...]