Micro Waves travels at high frequency than radio waves and provide through put as a wireless network media. Micro wave transmission requires the sender to be inside of the receiver.Following are the types of Micro waves:
- Terrestrial Micro waves
- Satellite Micro waves
1. Terrestrial Micro waves:
Terrestrial Micro waves are used are used to transmit wireless signals across a few miles. Terrestrial system requires that direct parabolic antennas can be pointed to each other. These systems operate in a low Giga Hertz range.
CHARACTERISTICS of Terrestrial Micro waves:
- Moderate to high cost.
- Moderately difficult installation
- 1 M bps to 10 M bps capacity
- Variable attenuation
- Low immunity to EMI
2. Satellite Micro waves:
The main problem with aero wave communication is the curvature of the earth, mountains & other structure often block the line of side. Due to this reason, many repeats are required for long distance which increases the cost of data transmission between the two points. This problem is recommended by using satellites.
Satellite micro wave transmission is used to transmit signals through out the world. These system use satellites in orbit about 50,000 Km above the earth. Satellite dishes are used to send the signals to the satellite where it is again send back down to the receiver satellite. These transmissions also use directional parabolic antenna’ with in line of side.
In satellite communication micro wave signals at 6 GHz is transmitted from a transmitter on the earth through the satellite position in space. By the time signal reaches the satellites becomes weaker due to 50,000 Km distance. The satellite amplifies week signals and transmits it back to the earth at the frequency less than 6 GHz.
Characteristics Satellite Micro Waves:
- High cost
- Extremely difficult and hare installation.
- Variable attenuation.
- Low immunity to EMI
- High security needed because a signal send to satellite is broadcasts through all receivers with in satellite.
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