Title :
Analysis of anisotropic conductors on anisotropic substrates
Author :
Megahed, Mohamed A. ; El-Ghazaly, Samir M.
Author_Institution :
Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ, USA
Abstract :
A full-wave finite-difference time-domain technique is used to study the anisotropy associated with anisotropic conductors on anisotropic substrates. The scheme is applied to analyze high temperature superconductor (HTS) YBCO film deposited on anisotropic sapphire substrate. The effect of the anisotropy on the performance of the coplanar waveguide and the microstrip line is evaluated. The losses and the dispersion characteristics, as well as the current distributions inside the HTS, are calculated. It is shown that the 90/spl deg/ r-cut sapphire substrate structure has lower loss and lower effective dielectric constant than the 0/spl deg/ r-cut substrate.<>
Keywords :
coplanar waveguides; current distribution; dispersion (wave); electromagnetic wave propagation; finite difference time-domain analysis; high-temperature superconductors; losses; microstrip lines; permittivity; superconducting microwave devices; Al/sub 2/O/sub 3/; YBaCuO-Al/sub 2/O/sub 3/; anisotropic conductors; anisotropic substrates; coplanar waveguide; current distributions; dispersion characteristics; effective dielectric constant; full-wave finite-difference time-domain technique; high temperature superconductor; losses; microstrip line; r-cut sapphire substrate; Anisotropic magnetoresistance; Conductors; Coplanar waveguides; Dielectric substrates; Finite difference methods; High temperature superconductors; Microstrip; Superconducting films; Time domain analysis; Yttrium barium copper oxide;
Conference_Titel :
Microwave Symposium Digest, 1995., IEEE MTT-S International
Conference_Location :
Orlando, FL, USA
Print_ISBN :
0-7803-2581-8
DOI :
10.1109/MWSYM.1995.405971
