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Q factor in impedance matching network


Feb 22, 2021
Feb 22, 2021
I learnt that in series network, Q = reactance / resistance; while in shunt network, Q = resistance / reactance (shown in Figure 1).
figure 1.jpg
I come across an example showing the way in constructing an impedance matching network (shown in Figure 2).
figure 2.jpg
The writer says that in the load network (figure 3), Q = RL / Xp2, and Q = Xs2 / Rvirtual
figure 3.jpg
and in the source network (figure 4) , Q = Xs1 / Rvirtual, and Q = Rs / Xp1
figure 4.jpg
I cannot find out how to determine when the connections are considered as "series" and "shunt" in this network. Q = RL/Xp2 can easily be seem as shunt, but I cannot figure out the logic for the Q of other three connections.

Can anyone help me ?

Thank you in advance.

Jack from HK