Abstract
A miniature superconductive lead-teflon-niobium coaxial line has been analyzed in terms of the complete BCS theory of superconductivity. The surface impedance of both superconductors, the line attenuation, and the picosecond step responses have been calculated for a temperature of 4.24°K. The dielectric has been assumed lossless. In addition, the frequency and time domain responses obtained with the BCS theory are compared with those predicted in 1968 by McCaa and Nahman for the same line parameters by the two fluid model.