Wireless transmission Media:

Following are different types of wireless transmission media:

1.     Microwaves

2.     Satellite

3.     Infrared

4.     Bluetooth

5.     Wifi

6.     Wimax

Microwaves: Microwaves are radio waves that provie high speed signal transmission. Microwaves transmission involves sending signals from one microvwave staion to another. It contains antenna, tranceiver and other equipment necessary for microwave communicatons. Microwaves sometimes called fixed points wireless.

Satellite: In popular usage, the term satellite normally refers to an artificial satellite, which would be a man-made object that orbits the Earth (or another body)

Satellite links uses microwaves frequencies. Satellite contains amplifier that amplify frequencies coming from earth stations.

Major drawbacks of the satellite communication is high cost of installing satellite in its orbit.Three satellite spaced at equal interval on120 angular degree can give  coverage of entire globe.

Infrared: It is the type of electromagnetic wave of large wavelength and small frequencies than visible light. Its frequencies id low. IR dat transmission is alsoemployed in short range comunicationan among computer peripherals.

It is used in optic fibre communication, wireless LAN, computre and printers & in many other electonic devices.

Bluetooth:  Bluetooth is a radio standard and communications protocol primarily designed for low power consumption, with a short range (power class dependent: 1 meter, 10 meters, 100 meters) based around low-cost transceiver microchips in each device.

Bluetooth lets these devices communicate with each other when they are in range. The devices use a radio communications system, so they do not have to be in line of sight of each other, and can even be in other rooms, so long as the received power is high enough.

Wifi:   It is an international standard describing the characteristics of a wireless local area network (WLAN). The name Wi-Fi (short for "Wireless Fidelity", sometimes incorrectly shortened to WiFi) corresponds to the name of the certification given by the Wi-Fi Alliance, formerly WECA (Wireless Ethernet Compatibility Alliance), the group which ensures compatibility between hardware devices that use the 802.11 standard. Today, due to misuse of the terms (and for marketing purposes), the name of the

standard is often confused with the name of the certification. A Wi-Fi network, in reality, is a network that complies with the 802.11 standard. Hardware devices certified by the Wi-Fi Alliance are allowed to use this logo:

With Wi-Fi, it is possible to create high-speed wireless local area networks, provided that the computer to be connected is not too far from the access point. In practice, Wi-Fi can be used to provide high-speed connections (11 Mbps or greater) to laptop computers, desktop computers, personal digital assistants (PDAs) and any other devices located within a radius of several dozen metres indoors (in general 20m-50m away) or within several hundred metres outdoors.