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Design and performance of a high-Tc superconductor coplanar waveguide filter

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7 Author(s)
W. Chew ; Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA ; A. L. Riley ; D. L. Rascoe ; B. D. Hunt
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The design of a coplanar waveguide low-pass filter made of YBa2Cu3O7-δ (YBCO) on an LaAlO 3 substrate is described. Measurements were incorporated into simple models for microwave CAD analysis to develop a final design. The patterned and packaged coplanar waveguide low-pass filter of YBCO, with dimensions suited for integrated circuits, exhibited measured insertion losses when cooled in liquid nitrogen superior to those of a similarly cooled thin-film copper filter throughout the 0 to 9.5 GHz passband. Coplanar waveguide models for use with thin-film normal metal (with thickness either greater or less than the skin depth) and YBCO are discussed and used to compare the losses of the measured YBCO and copper circuits

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IEEE Transactions on Microwave Theory and Techniques  (Volume:39 ,  Issue: 9 )