1_6 wave refelect

1_6 wave refelect - Department of Electrical and Computer...

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Department of Electrical and Computer Engineering ECSE 352 Electromagnetic Waves and Optics 6 Wave reflection 1.6 Wave reflection References: Hayt and Buck 11.9 Andrew Kirk 2005 1.6-1 Overview Reflections of waves from discontinuities (typically changes in impedance) is one of the most important aspects of electromagnetic wave theory and practise. When we use transmission lines we usually want to transfer as much power as possible to the load. However, if the impedance of the load does not match that of the line, there will be reflections. The flected ave ill terfere ith e rward oing ave d reflected wave will interfere with the forward going wave and cause several interesting effects. Sometimes these can be useful and other times they are annoying! The concepts that we develop inthi sclass will return many times during the course. ©AGK 2006 ECSE 352 1.6-3 TV cable example • The TV cable from the previous class has a loss of 9.4 x 10 -4 Np/m and an impedance of 80 Ω • The operating frequency is 84 MHz he cable is connected to a TV that has an input The cable is connected to a TV that has an input impedance of 100 Ω • Assuming that the initial signal is 10V and the cable is 500 m long, how much signal power is delivered to the TV? f =84 MHz ource 100 Ω ©AGK 2006 ECSE 352 1.6-4 500 m, 80 Ω source
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Transmission line classes A. Transmission line basics Introduction Lossless transmission lines Harmonic waves on transmission lines Time independent (phasor) notation ower transmission and loss Power transmission and loss B. Analog signal transmission 6. Resistive loads and reflections 7. Voltage standing wave ratio 8. Finite lines and input impedance 9. Smith chart calculation techniques 0 ingle stub matching 10. Single stub matching C. Digital signal transmission 11. Transient analysis ©AGK 2006 ECSE 352 1.6-5 12. Pulse propagation and initially charged lines
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1_6 wave refelect - Department of Electrical and Computer...

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