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Not Available In several cryo-electronic technologies there is a need to transmit large amounts of RF digital signals from a low temperature end (4K) to a relatively higher temperature end (80K), with minimum signal attenuation, low cross-talk, and low static heat load. The primary objective of the Phase I effort is to explore the feasibility of developing high temperature superconducting (HTS) transmission lines on flexible substrates for digital applications, meeting the RF and heat load requirements. Flexible 3-mole% yttria stabilized zirconia (YSZ), with a unique combination of mechanical, thermal, RF and chemical properties will be used as the substrate. In-plane aligned YSZ buffer layers will be deposited by Ion beam assisted Pulsed Laser Deposition method. Subsequently deposited YBCO films will be patterned to form 50W transmission lines and their RF properties will be evaluated.