Quaser Tech

The present communication revolution is in the nature of a race from wire to unwire medium. This has led to a significant shift in the area of broadcasting and communication. In this decade, we witnessed widespread growth in the area of terrestrial wireless services (Mobile Communication), particularly in China and South-east Asia. The upgradation in terms of speed and range of these services would lead to significant interference with ‘C’ band satellite communication services because WiMAX wireless services being developed lately are using the same frequency spectrum as allotted to C band satellite link. Satellite link providers would encounter this interference after implementation of WiMAX technology by terrestrial telecommunication operators.

The radio frequency spectrum is a limited natural resource and is a part of the electromagnetic spectrum extending up to approximately 3000 GHz. ‘C’ band is a portion of the electromagnetic spectrum in the microwave range of frequency. Theoretically the band extends from 4 to 8 GHz. It was the first frequency band allocated for commercial ground to satellite communication and vice versa.

A typical ‘C’ band satellite uses 3.7 – 4.2 GHz for downlink and 5.925 to 6.425 for uplink. ‘C’ band is primarily used for open satellite communication and is highly associated with satellite reception systems. There are slight variations in the ‘C’ band frequency and these are approved by ITU for usage in different parts of the world.

Source: Science Reporter, January 2009 issue.

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