Explain the types of Microwave Transmission?

Microwave transmission uses electromagnetic frequencies in the lower gigahertz range, which are higher than radio frequencies and provide better throughput and performance. This transmission technology can be classified into two main types: Terrestrial and Satellite microwave systems.

Terrestrial Microwave Transmission

Terrestrial microwave systems use directional parabolic antennas to transmit and receive signals in the lower gigahertz range. These signals are highly focused and travel in straight lines (line-of-sight). Relay towers can extend signal coverage over longer distances by acting as intermediate stations.

Smaller terrestrial microwave systems can operate within buildings, and some microwave LANs work at low power using small transmitters that communicate with omnidirectional hubs.

Characteristics of Terrestrial Microwave Systems

• Frequency range − Operates from 4-6 GHz and 21-23 GHz bands

• Bandwidth − Provides 1 to 10 Mbps data rates

• Interference − Signals affected by EMI, jamming, and eavesdropping

• Installation − Line-of-sight requirement makes setup challenging

• Cost − Short-distance systems are inexpensive; long-distance systems are costly

Satellite Microwave Communication

Satellite transmission operates like line-of-sight microwave transmission where one station is a satellite orbiting Earth. The satellite acts as a super-tall antenna and repeater, allowing microwave signals to span continents and oceans with a single bounce while reducing distance limitations imposed by Earth's curvature.

Comparison of Microwave Transmission Types

Advantages and Disadvantages

Satellite Advantages

• Wide coverage − Single satellite visible from vast geographical area

• Distance independent − Transmission costs don't increase with distance

• Self-monitoring − Transmission station can verify signal integrity

Satellite Disadvantages

• High cost − Extremely expensive to launch and maintain satellites

• Security concerns − Global transmission makes messages vulnerable

• Interference − Susceptible to electromagnetic interference

Conclusion

Microwave transmission offers two distinct approaches: terrestrial systems for shorter, line-of-sight connections and satellite systems for wide-area coverage. While terrestrial systems are cost-effective for short distances, satellite systems excel in spanning continents despite higher initial costs.