Study performance of near-field HF antenna using undercover ferrite sheet

A planar loop antennas with and without undercover ferrite are studied in this paper. The field simulated results show that the antenna with undercover ferrite provides more magnetic flux density at the same distance away from it. Using a receiving loop antenna in the simulation, the power gain of both transmitting antennas is compared. By using proper matching networks, the planar loop antenna with undercover ferrite provides a better power gain than that of the planar loop antenna.