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By Dr M. Senthilkumar Assistant Professor Department of Computer Science Government Arts and Science College, Avinashi - 641654 Waves, Frequency, Wavelength, Amplitude, Time, Applications

Waves, Frequency, Wavelength, Amplitude, Time, Applications

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Page 1: Waves, Frequency, Wavelength, Amplitude, Time, Applications

By

Dr M. Senthilkumar

Assistant Professor

Department of Computer Science

Government Arts and Science College, Avinashi - 641654

Waves, Frequency, Wavelength,

Amplitude, Time, Applications

Page 2: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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Types of Waves

Page 3: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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Speed, Wavelength, Frequency

✓ Light speed = Wavelength x Frequency

= 3 x 108 m/s

= 300,000 km/s

Page 4: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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System, Frequency, Wavelength

System Frequency Wavelength

AC current 60 Hz 5,000 km

FM radio 100 MHz 3 m

Cellular 800 MHz 37.5 cm

Ka band

satellite

20 GHz 15 mm

Ultraviolet light 1015 Hz 10-7 m

Page 5: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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Frequencies for Mobile Communication

✓ VHF-/UHF-ranges for mobile radio

✓ Simple, small antenna for cars

✓ Deterministic propagation characteristics,

reliable connections

Page 6: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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Frequencies for Mobile Communication

✓ SHF and higher for directed radio links, satellite

Communication

✓ Small antenna, beam forming

✓ Large bandwidth available

Page 7: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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Frequencies for Mobile Communication

✓ Wireless LANs use frequencies in UHF to SHF range

✓ Some systems planned up to EHF

✓ Limitations due to absorption by water and

oxygen molecules (resonance frequencies)

✓ Weather dependent fading, signal loss caused by

heavy rainfall etc

Page 8: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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Wavelength and Amplitude

Page 9: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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Electromagnetic Spread Spectrum

Page 10: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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The Radio Spectrum

Page 11: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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Frequencies and Applications

Page 12: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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Micro Waves Frequencies and Applications

Page 13: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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References

✓ Books:

✓ Data communication and Networking, 4th Edition,

Behrouz A Forouzan

✓ Computer Networks, 4th Edition, Andrew S. Tanenbaum

✓ Various relevant Websites

Page 14: Waves, Frequency, Wavelength, Amplitude, Time, Applications

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Thank You