SrTiO<sub>3</sub>-에폭시 복합재료의 전기적 특성

최형도; 조광윤; 박찬식; 윤호규

Polymer(Korea), Vol.21, No.6, 1039-1044, November, 1997

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SrTiO₃-에폭시 복합재료의 전기적 특성

Electric Properties of SrTiO₃-Exoxy/Composites

최형도, 조광윤, 박찬식, 윤호규

초록

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.

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.

[References]

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[3] Choi HD, Kim WS, Jeon IS, Yoon HG, Moon TJ, Polym.(Korea), 21(1), 112 (1997)

[4] Naito Y, Yin J, Mizumoto T, Inst. Elec. Commun. Eng. Jpn., J70-C(8), 1141 (1987)

[5] Kobayashi T, Nijima T, Yamada K, Uebayashi S, IEEE Trans. Microwave Theory Tech., 41(1), 136 (1993)

[6] Lee AK, ETRI J., 17, 45 (1995)

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[10] Lichtenecker K, Phys. Z., 10, 1005 (1908)

[11] Birks JB, Proc. Phys. Soc., 25(1), 81 (1951)

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[13] Han KC, Korea Univ., Ph.D. Thesis (1994)

[14] Snoek JL, Physica, 14, 207 (1948)

[15] Siwiak K, "Radiowave Propagation and Antennas for Personal Communication," p. 11, London (1995)

[16] Choi HD, Cho KY, Han S, Yoon HG, Moon TJ, J. Appl. Polym. Sci., in press (1997)