Performance investigation of data transmission in wireless power transfer with coil displacements

This paper investigates the relationship between antenna position and data communication performance in a magnetic resonance wireless power transfer (MRWPT) system. In MRWPT information such as the types of equipments, the required amount of electrical power, or the timing of power transfer should be transmitted from the antenna. It is assumed here that power transfer coils in the MRWPT system are employed as antennas for data communication. The frequency characteristic of the antennas change due to coil displacements. The power transfer coils are modeled as a band pass filter (BPF) and the frequency responses of the filter are presented in this paper. The characteristics of the filter are derived through circuit simulation and resulting data communication performance is evaluated. Numerical results obtained through computer simulation show that the bit error late (BER) performance can be improved by controlling the center frequency of the communication link.