Chapter 2 / 2.7 / 2.7.5

2.7.5 What Frequencies Are Used For Communications?

Examine the portions of the electromagnetic spectrum used for communications, from audio frequencies and radio waves to microwave, infrared, optical, and emerging terahertz systems. Learn why different services use different frequency bands and how frequency affects range, bandwidth, and antenna size.

1. What Is the Electromagnetic Spectrum?
2. What Are Audio Frequencies and Radio Frequencies?
3. What Are the Main Radio Frequency Bands?
4. What Are VHF, UHF, and Microwave Frequencies?
5. Why Do Different Services Use Different Frequencies?
6. Why Do Mobile Phones Use UHF and Microwave Frequencies?
7. Why Do Satellite Systems Use Microwave Frequencies?
8. What Frequencies Are Used by Fiber-Optic Systems?
9. What Is Free-Space Optical Communication?
10. What Are Terahertz Communications?
11. How Does Frequency Affect Antenna Size?
12. Will Communications Systems Continue to Move to Higher Frequencies?

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