1.1.8 Frequency

 

1.1.8 Frequency

 

Frequency is the number of signal cycles or waves transmitted in one second through a communication channel. It determines how fast and efficiently signals are transmitted over wired or wireless networks.

Simple Meaning:
Frequency tells us how many signal waves are sent in one second.

 

How It Works

In telecommunication, data is transmitted using electrical or radio signals. These signals travel in the form of waves. The number of waves sent every second is called frequency.

Different communication technologies use different frequency ranges to transmit data.

 

Units of Measurement

Frequency is measured in Hertz (Hz).

Unit	Full Form	Value
Hz	Hertz	1 cycle per second
kHz	Kilohertz	1,000 Hz
MHz	Megahertz	1,000,000 Hz
GHz	Gigahertz	1,000,000,000 Hz

Importance of Frequency

• Determines the speed of signal transmission.
• Helps improve communication quality.
• Supports wireless communication.
• Reduces interference between communication systems.
• Enables different technologies to use separate frequency bands.

 

Uses of Frequency

• 📶 Wi-Fi , 🎧 Bluetooth , 📱 4G and 5G mobile networks , 📻 Radio broadcasting
• 📺 Television broadcasting , 📡 Satellite communication , 🏷️ RFID systems
• 🍲 Microwave ovens

 

Advantages of Higher Frequency

• Faster data transmission.
• Better quality communication.
• Supports modern wireless technologies.
• Carries more information in less time.

Limitations

• Higher-frequency signals travel shorter distances.
• They are more easily blocked by walls, buildings, and trees.
• Higher frequencies require more communication towers or access points.

 

Examples of Frequency in Daily Life

Technology	Frequency Range	Purpose / Use
Wi-Fi	2.4 - 2.5 GHz	Wireless Internet
Bluetooth	2.4 - 2.5 GHz	Wireless connection between devices
FM Radio	88 - 108 MHz	Music and news broadcasting
AM Radio	530 - 1710 kHz	Long-distance radio broadcasting
Microwave Oven	2.45 GHz	Heating food
RFID (UHF)	860 - 960 MHz	Smart cards and inventory tracking
Television (UHF)	470 - 890 MHz	Digital TV broadcasting
5G (mmWave)	24 - 100 GHz	Ultra-fast mobile communication