강유전체를 이용한 이동통신주파수 대역용 박형 전파흡수체의 제조 및 특성

이영종; 윤여춘; 김성수; Young-Jong Lee; Yeo-Choon Yoon; Sung-Soo Kim

Korean Journal of Materials Research, Vol.12, No.2, 160-165, February, 2002

DOI10.3740/MRSK.2002.12.2.160 Export Citation

강유전체를 이용한 이동통신주파수 대역용 박형 전파흡수체의 제조 및 특성

Fabrication and Properties of Thin Microwave Absorbers of Ferroelectric Materials Used in Mobile Telecommunication Frequency Bands

이영종, 윤여춘, 김성수^†

충북대학교 공과대학 재료공학과, 컴퓨터 정보통신 연구소

Young-Jong Lee, Yeo-Choon Yoon, and Sung-Soo Kim^†

Research Institute for Computer and Information Communication, Chungbuk National University, Chungju 361-763, Korea

E-mail:

High-frequency dielectric and microwave absorbing properties have been investigated in ferroelectric materials (BaTiO 3 (BT), (1-x)Pb Mg 13 Nb 23 )O 3 -xPbTiO 3 (PMN-PT), (1-x)Pb Mg 13 Nb 23 O 3 -xPb(Zn_{\frac{1}{3}}Nb_{\frac{2}{3}})O _3$ (PMN-PZN) for the aim of thin microwave absorbers in the frequency range of mobile telecommunication. The specimenns are prepared by conventional ceramic processing and complex permittivity has been measured by transmission/reflection method. The ferroelectric materials show high dielectric constant and dielectric loss in the microwave range and their domiant loss mechanism is considered to be domain wall relaxation. The microwave absorbance of BT 0.9PMN-0.1PT, and 0.8PMN-0.2PZN specimen (determined at 2) are found to be 99.5% (at a thickness of 4.5 mm), 50% (2.5 mm), and 30% (2.5 mm), respectively. It is suggested that PMN-PT or PMN-PZN ferroelectrics are good candidate materials for the spacer of λ/4 absorber. The use of ferroelectric materials is effective in reducing the thickness of absorber with their advantage of high dielectric constant.

Keywords:ferroelectric;microwave;absorbers;mobile telecommunication

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[4] Matumoto M, Miyata Y, J. Appl. Phys., 79(8), 5486 (1996)

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[6] Swartz SL, Shrout TR, Schulze WA, Cross LE, J. Am. Ceram. Soc., 57(5), 311 (1974)

[7] Dielectric Ceramics, Short Course Book of 95th Annual Meeting of the American Ceramic Society, (1993) (1993)

[8] Wang HC, Schulze WA, J. Am. Ceram. Soc., 73, 825 (1990)

[9] Newnham RE, Jang SJ, Xu M, Jones F, pp. 51-67 in Ceramic Transactions Vol. 21, Microwaves : Theory and Application in Materials Processing, Edited by Clark DE, Gac FD, The American Ceramic Society, Inc.

[10] Poplavko YM, You YS, J. Kor. Phy. Soc., 32, S1737 (1998)

[11] Naito Y, Suetake K, IEEE Trans. MTT, 19(1), 65 (1971)

[12] von Hippel AR, Dielectrics and Waves, p.28, John Wiley & Sons, Inc., New York (1954) (1954)

[13] 橋本修, 花澤理宏, 守田幸信, 信學技報, EMCJ 98-32 (1998) (1998)