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- Vendik, Irina, et al.
(author)
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CAD Model for Microstrips on r-cut Sapphire Substrates
- 1994
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In: International Journal of Microwave and Millimeter-Wave Computer-Aided Engineering. - : Wiley. - 1050-1827 .- 1522-6301. ; 4:4, s. 374-383
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Journal article (peer-reviewed)abstract
- Simple and correct formulas are derived for calculation of an effective isotropic dielectric constant, which characterizes the wave propagation in microstrip lines on anisotropic substrates made of r-cut sapphire crystals. The r-plane is extensively used for epitaxial growth of high-Tc superconductor YBa2Cu3O7 films as applied to microwave integrated circuits. In contradistinction to previous models developed for z-cut sapphire, the nondiagonal dielectric permittivity tensor of r-cut sapphire is used. The effective dielectric constant of a microstrip line on r-cut sapphire substrate is found as a function of the strip-line geometry and the orientation of the crystallographic axes with respect to the symmetry plane of the microstrip line
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