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Amalogon

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where ZL1 is the first microstrips wave impedance and RLast should be (if I didn't misunderstood the formula) the load on the other side of the first microstrip conduction line.

So much for the theory. Now, in my opinion, R_Last should be half of the series circuit of the microstrips wave impedances ZL2 and ZL3 and the terminating resistor Rv

However, according to a solution I have, this does not seem to be the case. According to this solution, RLast should be only half of ZL2. Why? Is this even the case?

Here is my sketch of the circuit in microstrip technology (L2 and L3 should simply mark the lengths of the respective conductors here; all conductors are assumed to be lossless):

The deeper sense of the task is to calculate ZL2 as a function of ZL1 if wave matching is to exist ( thus r is zero at all times), independent of the length L2.