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Superconducting kinetic-inductance microwave filters

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3 Author(s)
Carroll, K.R. ; US Naval Res. Lab., Washington, DC, USA ; Pond, J.M. ; Cukauskas, E.J.

Several kinetic-inductance microstrip filters have been designed and tested. The microstrip consists of a superconducting niobium carbon nitride (NbCN) strip separated from a NbCN ground plane by an amorphous hydrogenated-silicon dielectric. The circuits investigated include an interferometer, a stepped-impedance, a low-frequency stub, and a high-frequency stub filter. Generally for frequencies below 20 GHz, good transmission characteristics were measured for these structures. A simple physical model is used to determine the major features of the transmission characteristics over a wide temperature and frequency range. Other important issues such as the superconductor and dielectric losses, impedance matching, and film uniformity are addressed for these structures.<>

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:3 ,  Issue: 1 )