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Unformatted text preview: Department of Electrical and Computer Engineering ECSE 352 Electromagnetic Waves and Optics 7 Voltage standing wave ratio 1.7 Voltage standing wave ratio References: Hayt and Buck 11.10 AGK 2006 1.7-1 Overview Overview We know that reflections will occur when the load is not impedance matched to the transmission line. The reflected signal will propagate back along the line and will interfere with the incident wave. This interference can be observed as a periodic modulation of the voltage along the line (this is equivalent to light and dark interference fringes that can be bserved hen ser ght flects om bject) his observed when laser light reflects from an object). This modulation is called a standing wave pattern, and is a very important concept in transmission line systems. The magnitude, location and period of the standing wave pattern can give us a lot of information about the system. ©AGK 2006 ECSE 352 1.7-3 Transmission line classes 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 multiple reflections 9. Smith chart calculation techniques ingle stub matching 10. Single stub matching C. Digital signal transmission 11. Transient analysis ©AGK 2006 ECSE 352 1.7-4 12. Pulse propagation and initially charged lines Contents Contents • Origin of the voltage standing wave • Definition of the VSWR • VSWR in different situations ti f VSWR i d i i • Location of VSWR maxima and minima ©AGK 2006 ECSE 352 1.7-5 Learning outcomes Learning outcomes After taking this class you should be able to: • Define the voltage standing wave ratio (VSWR) • Calculate the VSWR of a given system t i th l ti f VSWR i d i i • Determine the location of VSWR maxima and minima relative to the load • Explain the relationship between the standing and p p g traveling wave signals on a transmission line....
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This note was uploaded on 01/27/2011 for the course ECSE 352 taught by Professor Mi during the Spring '10 term at McGill.
- Spring '10