The transmission line is without loss of length λ / 4, the load $Z_L$ is a short circuit and $Z_G = Z_0$.
At $t = 0$, an incident wave of voltage $V_1$ and current $I_1$ such that $V_1 = Z_0 * I_1$ travel to the load, before $V_1$ reaches plane B the source $V_G$ delivers a power $P_G = V_G^2 / (Z_G + Z_0)$, then the waves $V_1$, $I_1$ reach the plane B and are fully reflected, generating reflected waves $V_2$, $I_2$ such that $V_2 = Z_0 * I_2$ that travel towards the source $V_G$, both form standing waves of total voltage $V = V_1 + V_2$ and total current $I = I_1 + I_2$ such that in plane A, $V / I = Z_{in} = ∞$ then the source sees an open circuit at A and cannot deliver any more energy.
If the above is correct, my questions are:
- once the $V_2$, $I_2$ waves reached the source, what happens to them?
- If the answer is that they dissipate in $Z_G$, where does that energy come from? since the source sees an open circuit ($Z_{in} = ∞$) and for this to happen I need $V_1$, $I_1$ and $V_2$, $I_2$ at all times.