Nano Satellite

Nano Satellite

  • Submitted By: arvind1420
  • Date Submitted: 10/13/2011 10:41 AM
  • Category: Technology
  • Words: 2780
  • Page: 12
  • Views: 281

Arvind kumar Singh, Aakriti Vaish
EC department, NIET

Abstract- this document provide overview of the E- band wireless communication that allows gigabit per second (gbps) data rates and provide high security, high speed, point to point, non-wire-line communications and simultaneously transmit power wirelessly.
Keywords – millimeter waves , high speed communication , gbps data rate, point to point communication, wireless power transmission.
Introduction- Wireless communication systems traditionally have not provided any level of security. In fact, the early value of wireless was its ability to be widely detected and decoded (for example, terrestrial TV and radio broadcasts). However, the growth of data communications for Internet and e-commerce services has forced systems designers to start considering security as a primary system requirement.

Why 70 and 80 GHz?
Atmospheric absorption varies significantly with frequency, as shown in Figure 1. At conventional microwave frequencies, atmospheric attenuation is reasonably low, until a peak is seen at 60 ghz, where absorption by oxygen molecules results in 15 dB/km attenuation, seriously limiting radio transmission distances.
After this peak is a large window where attenuation drops to less than 1 dB/km (effectively negligible) before rising again due to other molecular effects. This window has a minimum at 94 GHz,which is why this frequency has been previously exploited for military applications. It can be seen that the spectrum from around 70 GHz up to around 120 GHz exhibits low atmospheric attenuation and fortunately is relatively unused.
One strong benefit of E-band wireless is that it is unaffected by many other transmission deteriorations. Thick fog, for example, at
a density of 0.1 g/m3 (about 50 m visibility) has just 0.4 dB/km attenuation at 70/80 GHz[5], compared to more than 225 dB/km at visible...

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