Abstract
Coplanar (with the ground) 20 cm long waveguides are manufactured from the YBCO-on-Kapton material. We inves-tigate the effect of parasitic ground plane resonances on the per-formance of these waveguides. It is concluded that dense rows stitching vias are essential for isolating the lines to a level below 60 dB at 6 GHz. We demonstrate a metalized via technology that is compatible with both the traditional Flexible Printed Circuit (FPC) process and the epitaxial YBCO material. Stitching via fence with the via period 10 mm is shown as effective in suppress-ing parasitic resonances at 77 K.
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