This paper proposes a wireless power transmission system using a parallel transmission line in order support mobility for receivers. The secondary inductor circuit nearby the transmission line is magnetically coupled with the transmission line in order to transmit power. The circuit analysis shows that the proposed system has the same impedance conversion characteristics of LC high pass filters. This paper theoretically derives that the proposed system is capable of improving the power transmission efficiency performance. Computer simulation analysis based on electromagnetic field simulator also confirms that the proposed system achieves the high power transmission efficiency.