Low-Loss Composite NiCuZnCo–BaTiO3 With Matched Permeability and Permittivity in High Frequency Range

The magnetic and dielectric properties of the composites Ni
_0.35
Cu
_0.18
Zn
_0.45
Co
_0.02
Fe
_1.95
O
₄
+ x wt% BaTiO
₃
(x = 0, 5, 10, 15, 20, 25) were investigated. All samples were sintered at 1080 °C for 3 h to obtain approximately equal real permeability and permittivity. X-ray diffraction results indicated that there had no obvious reaction between the NiCuZnCo ferrite and the BaTiO
₃
in all samples. BaTiO
₃
powder could obviously suppress grain growth of the composites. The sample Ni
_0.35
Cu
_0.18
Zn
_0.45
Co
_0.02
Fe
_1.95
O
₄
+ 15 wt% BaTiO
₃
presented a real permeability of ~29 (loss tangent ~0.02) and a real permittivity of ~28.3 (loss tangent ~0.002), respectively, over 3-30 MHz. This composite material had potential prospects in antenna miniaturization at HF band (3-30 MHz).