A Compact Low-Pass Filter Based on the Fe₃O₄@SiO₂-CCTO-Epoxy Composite Film

Abstract

A compact low-pass filter (LPF) with defect ground structure (DGS) is presented based on the Fe₃O₄@SiO₂-CCTO (CaCu₃Ti₄O₁₂)-epoxy three-phase composite film. The transmission performances of the LPF were investigated through EM simulation. The results show that the frequency of the attenuation poles is related with the electromagnetic property of the film. The LPF with DGS shows good suppression at the high frequency and little ripple in the passband. The higher permeability and permittivity, as well as the DGS, will result in the attenuation poles moving to the low frequency. These results demonstrated that the dielectric–magnetic–polymer composites film with high permittivity and permeability coupled with the DGS is an effective way for the LPF miniaturization.

Keywords:

• Magnetodielectric
• Fe₃O₄@SiO₂
• CCTO
• Low-pass filter
• DGS

Acknowledgments

The present research is supported by the research funding from National S&T Major Project with the contact No. 2009ZX02038 and the Guangdong Innovative Research Team Program (No. 2011D052).