Frequency tuning has been carried out to mitigate the frequency splitting effect and to obtain high efficiency at close distances .
23] < 30cm, the efficiency decreases due to the frequency splitting effect .
Another remedy is to adjust the input frequency at the distance closer than the critical coupling point where the transmit and receive coils are over-coupled and frequency splitting is occurred .
Capable of simultaneously processing digital signals across a wide spectrum in real-time, the basic PFT architecture utilises a series of frequency splitting
stages to sub-divide the signal-of-interest band.