The effect of volume fraction of SrTiO₃ on electromagnetic properties and the frequency dispersion behavior of the complex permittivity of the SrTiO₃-epoxy composite were investigated. The composites were prepared by the cement mixing method and shaped to coaxial type. The complex permittivity and permeability were measured using a network analyzer in frequency range 130 MHz-10 GHz. The complex permittivity of the composites was found to increase as the amount of SrTiO₃ increased. The logarithmic model well coincided with the effective permittivity of composite as a function of SrTiO₃ volume fraction. The resonance frequency of composites was found to show good agreement with the theoretical values calculated by the equation proposed in this article. Also, a model to discribe the frequency dispersion characteristic of the complex permittivity was proposed.

SrTiO₃-에폭시 복합재료의 SrTiO₃함량에 따른 전자기적 특성과 복소유전율의 주파수 거동을 살펴보았다. 복합재료는 시멘트 혼합방법에 의해 혼합되었고, 측정시편은 동축형으로 만들었다. 130MHz부터 10GHz의 주파수 영역에서 network analyzer를 이용하여 복합재료의 복소투자율과 복소유전율을 구한 결과, 복소유전율은 SrTiO₃함량이 증가함에 따라 증가하고, SrTiO₃함량에 른 실효유전율은 대수혼합식과 비교적 잘 일치하며, 공진주파수는 본 논문에서 제시한 식과 일치 하는 것을 알았다. 또한 복초유전율의 주파수 분간거동에 대한 모델을 제시하였다.

Keywords: