High T/sub c/ superconducting device development at Du Pont

A summary of the high T/sub c/ superconducting (HTS) device development program at Du Pont over the past two years is presented. A number of HTS devices have been designed, fabricated and tested, such as a 5-GHz microstrip line resonator; 3-pole, 5-pole, and 7-pole microstrip line bandpass filters; an 11 ns coplanar delay line; a 0.5-4.5 GHz 7-section Chebyshev microstrip line power splitter/combiner; a 5.55 GHz HTS-sapphire resonator with extremely high Q value; and a III-V semiconductor-HTS hybrid amplifier and oscillator. The thin film HTS materials used for fabricating these devices were: YBaCuO