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My question is to the circuit drawing I have attached. (representing a simplified rfid system, with "Circuit 1 being the tranceiver antenna, "Load" being a transponder and "Circuit 2" represents an additional circuit between)

...

For optimal performance the circuit should resonate at a given frequency. When calculating the needed capacitance in circuit 1, do I have to consider the mutual inductance between L1 and L2 ? (For now I assume the coupling factor between L3 and L4 is small compared to the coupling factor between L1 and L2.)

[tex]Z_{1}=R+\frac{1}{j\omega C_{1}}+j\omega L_{1}-j\omega M[/tex]

And that the needed capacitance is simply such that it cancels out the inductive reactance given by [tex]j\omega L_{1}[/tex] and [tex]jwM[/tex].

Am I on the right track????

If I am, I assume that the capacitor C2 must be found the same way?

best regards

eirik

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# Resonance in coupled circuit

Can you offer guidance or do you also need help?

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