Abstract
The wireless communications have been tremendously developed in the recent ubiquitous age. The utilizable frequency region has been expanded to millimeterwaves because of shortage of conventional frequency regions. For the ultra high frequencies of millimeterwaves, dielectrics with ultra high quality factor Q and low dielectric constant ε r are desired. Low ε r is necessary to short the delay time of signals and to make devices small in size. Silicates for candidate of millimeterwave materials have low dielectric constant, because of silica-oxygen tetrahedra composed of half covalent bonds. Forsterite (Mg2SiO4) as such kind of silicates has high Q ⋅ f of 270000 GHz and low ε r of 6.8. The temperature coefficient of resonant frequency τ f was improved by adding rutile TiO2 with high τ f of plus 450 ppm/∘C. In this paper, these results for forsterite are summarized.
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Ohsato, H., Tsunooka, T., Sugiyama, T. et al. Forsterite ceramics for millimeterwave dielectrics. J Electroceram 17, 445–450 (2006). https://doi.org/10.1007/s10832-006-0452-6
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DOI: https://doi.org/10.1007/s10832-006-0452-6