Title :
Attenuation and dispersion for high-Tc superconducting microstrip lines
Author :
Ekholm, Erik B. ; Mcknight, Stephen W.
fDate :
4/1/1990 12:00:00 AM
Abstract :
The attenuation and dispersion of microstrip lines of the high-Tc superconductor YBa2Cu3O7 (YBCO) on yttria-stabilized zirconia substrates as a function of frequency and temperature are calculated. The effect on pulse propagation of superconducting and model dispersion in addition to the attenuation is demonstrated. At 60 K, microstrip lines of YBCO are significantly less attenuating at frequencies below 500 GHz than microstrip lines of copper at the same temperature. This advantage is particularly significant at the higher attenuations that result as the substrate thickness is made smaller for miniaturization or to improve the microstrip line bandwidth. The application of YBCO for microstrip lines appears to be most useful at frequencies above 100 GHz and dielectric thicknesses less than 100 μm, where the attenuation of cooled copper is prohibitively large. Cooled to temperatures below 20 K, YBCO may make possible a new generation of extremely high bandwidth (~5 THz), small-feature-size (~5 μm) circuits and devices
Keywords :
barium compounds; dispersion (wave); guided electromagnetic wave propagation; high-temperature superconductors; losses; strip lines; superconducting devices; waveguide theory; yttrium compounds; 100 GHz; 100 micron; 20 K; 5 THz; 60 K; EHF; YBa2Cu3O7-ZrO2:Y; ZrO2:Y substrate; attenuation; dielectric thickness; frequency; high bandwidth devices; high temperature superconductors; high-Tc superconductor; millimetre wave region; model dispersion; pulse propagation; substrate thickness; superconducting loss; superconducting microstrip lines; temperature; Attenuation; Dielectric losses; Dielectric substrates; Dispersion; Frequency; High temperature superconductors; Microstrip; Stripline; Superconducting transmission lines; Yttrium barium copper oxide;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
