[HELP] Spiral Coils Simulation in COMSOL 4.2

Hi everybody,

I've tried to design a spiral coil in COMSOL but the model did not work because of the wrong port excitation.

My goal is to build a system of two planar spiral coils and simulate the power transmission between them.

Would you all give me an instruction?

P/S: I've attached my COMSOL file.

Thanks in advance