Title :
Modeling of planar quasi-TEM superconducting transmission lines
Author :
Antsos, Dimitrios ; Chew, Wilbert ; Riley, A. Landis ; Hunt, Brian D. ; Foote, Marc C. ; Bajuk, Louis J. ; Rascoe, Daniel L. ; Cooley, Thomas W.
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
fDate :
6/1/1992 12:00:00 AM
Abstract :
Design oriented modeling of high-temperature superconducting thin-film microwave circuits is difficult when film thickness is on the order of the penetration depth of the fields. Involved formulas for loss, phase velocity and characteristic impedance can be derived from the Bardeen-Cooper Schrieffer (BCS) theory of superconductivity. The parameters required by these formulas do not correspond to readily measurable observables that depend on the manufacturing process of the superconductor. An application of the phenomenological loss equivalence method in modeling the microwave behavior of planar quasi-TEM superconducting transmission lines is presented. Measured and modeled S-parameters of a superconducting coplanar waveguide lowpass filter agree to within 0.3 dB in magnitude and 0.5 radians in phase. Extracted values for the penetration depth and the real part of the conductivity of the superconducting film are within 10% of the findings of other researchers
Keywords :
BCS theory; high-temperature superconductors; microwave filters; passive filters; penetration depth (superconductivity); superconducting thin films; transmission line theory; waveguide components; waveguide theory; BCS theory; Bardeen-Cooper-Schrieffer theory; CPW low pass filter; S-parameters; characteristic impedance; conductivity; coplanar waveguide lowpass filter; design based modeling; film thickness; high temperature superconductors; loss; microwave behavior; penetration depth; phase velocity; phenomenological loss equivalence method; planar transmission lines; quasi TEM transmission lines; superconducting CPW; superconducting film; superconducting transmission lines; thin-film microwave circuits; High temperature superconductors; Microwave circuits; Superconducting films; Superconducting filters; Superconducting microwave devices; Superconducting thin films; Superconducting transmission lines; Thick film circuits; Thin film circuits; Transmission line measurements;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
