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High temperature superconducting slow-wave coplanar transmission lines with normal-metal crossbars

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7 Author(s)
Hietala, V.M. ; Sandia Nat. Labs., Albuquerque, NM, USA ; Martens, J.S. ; Plut, T.A. ; Tigges, C.P.
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A novel superconducting slow-wave transmission line has been prepared by overlaying a superconducting coplanar waveguide with normal metal crossbars. The crossbars increase the energy storage along the transmission line, reducing the line's group velocity allowing for shorter delay lines. Additionally, the cross-sectional dimensions of the line are smaller than typical transmission line structures, allowing for a further reduction of delay line size. Measurements show a group velocity of about 0.12 the speed of light with low dispersion, a 25 Ω characteristic impedance, and moderate transmission loss. Because the group velocity is largely independent of any properties of the superconductor, these transmission lines exhibit excellent temperature stability and delay reproducibility

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:42 ,  Issue: 6 )