1. RF (Radio Frequency) 의 응용 서강대학교 전자공학과 2005 년 정보통신공학개론

2. Sogang Univ Contents Wireless Communication History System configuration Wireless system & RF RF Definition Characteristic Application of RF Related subject

3. Sogang Univ Wireless Communication Electromagnetic and waves 1831: Faraday discovers electromagnetic induction 1864: Maxwell presents his theory of electromagnetic 1877: Lord Rayleigh present his theory of sound propagation Application of Microwaves-Communication 1844: Morse invents telegraphy 1876: Bell invents the telephone 1885: Hertz demonstrates electromagnetic-wave propagation in a series of experiments covering a period through 1897 1894: Marconi, using Herts-type equipment, transmits telegraphy signal over two-mile path during the period through 1896. Marconi was awarded a Nobel Prize in 1909 for this work on wireless telegraphy

4. Sogang Univ Herts original apparatus

5. Sogang Univ Recent Trend

6. Sogang Univ Recent Trend Paging system CT2 Cellular PCS 3G(WCDMA, EV-DO….) 4G system

7. Sogang Univ System configuration 1 A(t) : information A(t)cos(wt) :modulated carrier

8. Sogang Univ Why carrier Radio transmission needs antenna Antenna size depends on wave length If f=3000Hz ramda=c/f Ramda=10 5 m : impossible!!

9. Sogang Univ Contents Wireless Communication History System configuration Wireless system & RF RF Definition Characteristic Application of RF Related subject

10. Sogang Univ RF characteristic

11. Sogang Univ RF characteristic

12. Sogang Univ RF analysis Short wavelength Lumped & Distributed concept S-parameter Smith chart Impedance matching Transmission line Passive component Active componenet

13. Sogang Univ System configuration 2

14. Sogang Univ RF component

15. Sogang Univ Contents Wireless Communication History System configuration Wireless system & RF Why RF ? Definition Why RF? Characteristic Application of RF Related subject

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24. Etc. Astronomy and space exploration- Deep space probe Communication Direct broadcast satellite HDTV Domestic & industrial application Agriculture Automobile-antithieft detection, Collision avoidable radar, near obstacle detection, radar speed sensor, automatic tall collection, vehicle detection, Microwave imaging-hidden weapon detection Medical application Microwave imaging Cancer cell killing Wireless application Wireless local area networks (LANs)

25. Sogang Univ Contents Wireless Communication History System configuration Wireless system & RF RF Definition Characteristic Application of RF Related subject

26. Sogang Univ Related Subject Basic circiut theory Microwave Engineering Electromagnetic Physical Electronics Electronic circiut Communication system Digital signal processing Real application

27. Sogang Univ RF component

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29. Oscillator

30. Sogang Univ PLL

31. Sogang Univ