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Modeling of planar quasi-TEM superconducting transmission lines

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8 Author(s)
Antsos, D. ; Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA ; Chew, W. ; Riley, A. ; Hunt, B.D.
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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

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:40 ,  Issue: 6 )