Transmission Media (Wireless)

Introduction to Wireless Transmission Media

In this section, we will explore different methods of wireless transmission media used in communication systems, including microwave, satellite, radio, and infrared.

Microwave Communication

• Microwave communication involves sending high-frequency signals from towers called transponders.

• Transponders are placed about 40 to 50 meters apart and the signal is sent directly through line-of-sight from one tower to another.

• This type of communication is used by telephone networks, internet service providers, and companies for remote monitoring and management.

Satellite Communication

• Satellite communication aims to overcome line-of-sight barriers that can occur due to geographical obstacles.

• Transponders are still spaced far apart but a satellite is set up in space that rotates with the Earth's movement.

• Data sent up to the satellite is known as an uplink, while data returned back to Earth is known as a downlink.

• Satellite communication allows for long-distance transmission of signals.

Radio Waves

• Radio waves are used for wireless technologies such as Wi-Fi, RFID, NFC, and Bluetooth.

• Radio towers emit radio signals for various purposes like listening to radio broadcasts or setting up home Wi-Fi networks.

• These wireless networks can be established locally within houses or in public places like shopping centers.

Infrared Communication

• Infrared communication uses a direct line-of-sight approach using infrared lasers with low-frequency light.

• Devices like TV remotes use infrared technology where the signal needs to be aimed directly at the receiver.

• Infrared communication has limited range and can be easily blocked by obstacles.

Conclusion

The transcript concludes by highlighting various applications of wireless communication mediums such as home entertainment systems, intrusion detectors, fire detectors, and medical diagnostic equipment.