Q XUE_Chapter1 - Chapter 1 Introduction to Wireless...

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Chapter 1 Introduction to Wireless Techniques
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Scope of Applications 1. Wireless Communications 2. Radar 3. Navigation 4. Remote Sensing 5. RFID 6. Broadcasting 7. Automobile and Highway 8. Sensors 9. Surveillance and Electronic Warfare 10. Medical 11. Radio Astronomy and Space Exploration 12. Wireless Power Transmission
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Frequency Range According to US Federal Commission of Communications (FCC), Radio frequency (RF) and microwave can range from very low frequency at couple of kHz to 300 GHz. However, when we talking about RF or microwave, we indicate a frequency band of 300MHz to 110GHz.
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Spectrum Allocation 30-300kHz 300kHz-3MHz 3-30MHz 30-300MHz Ultra High Freq.(UHF) 300MHz-1GHz L Band 1GHz-2GHz S Band 2GHz-4GHz C Band 4GHz-8GHz X Band 8-12GHz Ku Band 12-18GHz K Band 18-26.5GHz Ka Band 26.5-40GHz Millimeter Wave 40-100GHz 300-3000GHz 100-07μm 0.7-0.43μm 0.43-0.003μm Visible Ultraviolet Very High Frequency VHF Microwave Sub-millimeter wave Infrared Mid Wave MW High Frequency HF Long Wave LW RF
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Spectrum Allocation Radio Frequency 300MHz -1GHz Microwave 1 GHz- 40 GHz Millimeter wave 40 GHz-300 GHz Sub-millimeter wave 300GHz-3000GHz Also called Tera-Hertz, or THz. Tera- means 12 10 +
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Propagation Characteristic Propagate at optical speed in free space (1) Radiation power density (2) The power attenuate at the rate of inverse square of the distance. If the distance of the receiver increased by 2 times, the radiation power should be 4 times larger for receiving the same power.
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