High temperature superconductor coplanar delay lines

Coplanar delay lines of different geometries for YBaCuO films on LaAlO/sub 3/ substrate have been designed and characterized in the time domain. The lines are of the double spiral type with lengths of 257 mm and 434 mm on 10-mm * 10-mm and 20-mm * 20-mm substrates with a measured pulse dispersion of 0.8 ps/cm and 1.8 ps/cm, respectively. A preparation process which meets the requirements for high aspect ratios was used. The measured results have been compared with the corresponding predictions of specially developed electromagnetic simulators which include both the London and the Mattis-Bardeen theory. The agreement between measured and simulated values was sufficient for design purposes.<
>