Why do reflections occur in transmission lines. Why does the wave travel back from the load?
I do not think there is any better way to do it. Circuits, disregarding RF and microwave circuits, largely ignore wave theory. So there isn't a direct analog along those lines. But there are a large number of typical daily experiences that we can look towards. How about the reflection and transmission of sound? When you yell at a barrier, some of the sound is reflected (echo) and some is transmitted (some bloke on the other side hears your muffled screams). This happens for the same reasons, the barrier represents a change in the impedance of the medium. Why does a change in impedance cause reflections? Well, one way to think about it is conservation of momentum. When light goes from one medium to the next its velocity changes (if there is a change in the index of refraction). This means that the momentum of the wave changes and for the momentum to be conserved there must be some reflection. This is probably the most physical analogue that we can use though it requires us to think more quantum mechanically than the classical theory that we use to derive the behavior.lalbatros, thanks for the explanation. Optics analogy is great. But how to explain it to ppl who come from circuit background(non-Electromagnetics).
This is straigthforward, using a lumped elements model of the transmission line.lalbatros, thanks for the explanation. Optics analogy is great. But how to explain it to ppl who come from circuit background(non-Electromagnetics).