Application of HTSC-thin films in microwave integrated delay lines

The author describes the capabilities of high-temperature superconducting thin films (HTSTF) for possible application in microwave integrated delay lines. HTSTF can be characterized as thin-film microstrip (TFMS) lines operating at superconducting temperatures. Low insertion loss, minimum signal delay, and small power dissipation are possible with HTSTF delay lines. The conductor loss, dielectric loss, signal distortion, signal delay, and instantaneous bandwidth are dependent on the film thickness, superconducting film material, and substrate properties. Thin films on yttrium barium copper oxide (YBCO), bismuth strontium calcium copper oxide (BSCCO), and thalium calcium barium copper oxide (TCBCO) appear to be the most suitable for microwave integrated delay lines.<>