표 1. | Table 1. 결합계수에 따른 TX 코일 전압과 전류의 위상차가 0이 되는 주파수 케이스 분류 | Frequency at which the phase difference between TX coil voltage and current according to the coupling coefficient becomes 0.

Relative coupling coefficient	Frequency where the TX coil voltage and current phase difference becomes zero
k>kcritical	ωa, ωb (two positive frequencies)
k=kcritical	ωa=ωb (only one positive frequency)
k<kcritical	- (two complex frequencies)