let's consider a transmission line of length L closed on a mismatched load. So, there will be a travelling wave and a reverse travelling wave:
V(z) = V+(z) + V-(z)
My question is: will there always be a standing wave, or does it depend on if it is true that L = n * Lambda/2, with n integer?
Sometimes I read that to have a standing wave it is sufficient to have two waves of same frequency going in opposite direction, while sometimes I read that it is necessary that the length of the medium respects the previous formula.