Magnetic-dielectric property of FeAlSi-CCTO-Epoxy composite for antennas miniaturization and embedded inductor-capacitor application

This paper reports a FeAISi (sendust)/CaCu₃Ti₄O₁₂ (CCTO)/Epoxy three-phase composite prepared through a simple procedure. The magnetic-dielectric properties of the composites were analyzed using impedance analyzer (Agilent 4991) in a frequency range from 10⁶ to 10⁹ Hz. The results show the weak coupling effect between the FeAISi and CCTO fillers in the three-phase composite. The real permeability (μ´) of the composite slightly increases from 1.4 to 1.6 with the CCTO content increasing from 3vol% to 18vol% at 10⁸ Hz. The magnetic loss tangent remains at a relatively low level. The real dielectric constant (ε_r´) of the composite rises from 14 to 24.5 with the low loss tangent about 0.05 when the volume fraction of CCTO (f_CCTO) increases from 3vol% to 18vol% at 10⁸ Hz and room temperature. The applications in antenna miniaturization and embedded capacitors and inductors were discussed in view of several aspects.