Effect of Dopants on the Microwave Dielectric Properties of <TEX>$(1-x)MgTiO_3-xCaTiO_3$</TEX> Ceramics

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J. Korean Ceram. Soc. > Volume 34(8); 1997 > Article

Journal of the Korean Ceramic Society 1997;34(8): 843.

불순물 첨가에 따른 $(1-x)MgTiO_3-xCaTiO_3$ 세라믹스의 마이크로웨이브 유전특성변화

우동찬, 이희영, 한주환, 김태홍¹, 최태구¹

영남대학교 금속공학 및 재료공학부
¹한국전자통신연구소 통신부품연구실

Effect of Dopants on the Microwave Dielectric Properties of $(1-x)MgTiO_3-xCaTiO_3$ Ceramics

ABSTRACT

The effect of dopant on microwave dielectric properties of (1-x)MgTiO3-xCaTiO3 ceramics, known to be used as microwave dielectric resonators for global positioning system and personal communication system, has been analyzed in terms of variations in defect concentrations and microstructural features with its addition. The addition of dopants was revealed to result in a significant change in the microstructure as well as defect concentration of the ceramics. For instance, the quality factor is proportional to sintered density of the ceramics by inversely proportional to grain size as well as vacancy concentration. Accordingly, it is believed that the dopant effect on the microwave dielectric properties should be separately analyzed with either microstructural change or the change in vacancy concentration.

Key words: Microwave, Dielectric Resonator, $(1-x)MgTiO_3-xCaTiO_3$, Dopant, Defect, Microstructure, Dielectric Properties