A procedure to estimate S parameters and farfield radiation power from structural parameters of coupledresonant wireless power transfer in kHz range is discussed. Helical antenna is modeled by series connection of loop antennas. All combinations of loop antennas are taken into account for calculation of self and mutual inductance. Stray capacitance between neighboring loops and ohmic loss are also regarded. Numerical demonstration shows that the proposed procedure has calculation accuracy as same as method of moment (MoM) calculation, when wire length is much smaller than the wavelength. Calculation time for the proposed procedure was 0.5 seconds whereas MoM requires 200minutes.
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