Abstract
Parallel plate and microstrip resonator experiments show that NbN films have large magnetic penetration depth and a peak RF critical current density which either matches or exceeds the DC critical current density, depending on the temperature. The large penetration depth, /spl lambda/, suggests that narrow NbN transmission lines will have increased inductive nonlinearities, when compared with other superconductors. The relation between the DC and peak RF critical current densities indicates that by modeling the RF current distribution a simple DC breakdown measurement can be used to estimate a transmission line's RF current carrying capacity.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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