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

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Presentation transcript:

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

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

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 : Marconi, using Herts-type equipment, transmits telegraphy signal over two-mile path during the period through Marconi was awarded a Nobel Prize in 1909 for this work on wireless telegraphy

Sogang Univ Herts original apparatus

Sogang Univ Recent Trend

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

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

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!!

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

Sogang Univ RF characteristic

Sogang Univ RF characteristic

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

Sogang Univ System configuration 2

Sogang Univ RF component

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

Sogang Univ

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)

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

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

Sogang Univ RF component

Sogang Univ

Oscillator

Sogang Univ PLL

Sogang Univ

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