i have a rf-system that is working in frequency range of 100 MHz and try to match the impedance of the load to the source system (50 Ohm).

So, in general, i know that a network (P- or T-Network) has to be placed between the source and the load to maximize the power transmission between both. This should look like this one:

There also certain calculation rules to calculate the values of the matching circuit to fit between the source and the constnt load at the given frequency.

But know, i dont have a fixed impedance but an impedance curve over a frequency range in which i want to have the best coupling between the systems. The impedance load looks like this one here:

Do you know a good way to make the impedance matching circuit operating in a given frequency range for a given impedance curve. What is a good method to use for this kind of problem.

In general, a method to match such a network can be started by looking at the cause of the impedance shift. In your example, it would apear you have a resonant short at $$\f_m\$$ and resonant shunt at $$\f_n\$$. If you model those with poles and zeros you can tune them out in a more complex matching network.