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#11
September 21st 03, 12:00 PM
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Cecil Moore wrote:
wrote: I somewhat sympathize with your dilemma. You have latched on to these forward and backwards waves for so long that you have started to believe that they are real and are therefore ascribing to them all the properties one would expect of a real EM wave such as current and power. So what causes standing waves if there are no forward and backwards waves? When you solve the differential equations describing the circuit with distributed capacitance, inductance, resistance and conductance, given the excitation and boundary conditions, you discover that the voltage and current distributions along the line form a standing wave. No need for reflections at all. It is a whole lot more convenient using the reflection model though. Just for a brief moment attempt to relax your hold on forward and reverse waves and think of the real voltages and currents on the line. I will just as soon as you demonstrate how to generate standing waves without the existence of a forward wave and reverse wave. OK. Go for it. ....Keith |
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