BaTiO₃-Refined NiCuZn Ferrites Towards Enhanced Pulse Detection Sensitivity for a High-Frequency Current Transformer

High-frequency current transformer (HFCT) sensors are widely used in pulse detection at high frequencies. The sensitivity of the HFCT needs to be improved for low-level pulse detection at high frequencies because their waveforms can rapidly attenuate and disperse. This research shows that refining the ferrites of the magnetic cores can improve their permeability at high frequencies. We employed a two-step sintering technique to refine the nickel-copper-zinc (Ni-Cu-Zn) ferrites by adding barium titanate (BaTiO₃). The contribution of the spin rotation to the magnetization was thereby improved. As a result, the transfer functions of the HFCT sensors made from the refined ferrites were improved, significantly improving their sensitivity for pulse detection at high frequencies.