Epoxy/BaTiO3composites have been of great interest as embedded capacitor materials, mainly due to high dielectric constant of ceramic powders, and good process compatibility of epoxy with printed circuit boards (PCBs). However, one of the potential problems of epoxy/BaTiO3composite is the dielectric relaxation at gigahertz range. In this paper, epoxy/SrTiO3composite embedded capacitor films (ECFs) were fabricated for high-frequency applications. Dielectric constants of epoxy/SrTiO3composite embedded capacitor films with various SrTiO3particles loading for three different commercial SrTiO3powders were measured, and experimental data were fitted to the Lichtenecker equation for the prediction of the effective dielectric constant of SrTiO3powders in epoxy/ SrTiO3composite ECFs. Using a rectangular cavity resonator method, dielectric constants of epoxy/SrTiO3composite ECFs were measured at gigahertz range (1-10 GHz). At gigahertz frequencies, dielectric constants of epoxy/SrTiO3composite ECFs were nearly constant. In contrast, epoxy/BaTiO3composite ECFs showed decrease of dielectric constants above 5 GHz. Therefore, it is concluded that epoxy/SrTiO3composite ECFs can be more effectively to be applied for high-frequency applications.
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Lee et al. (2007) studied this question.
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