MICROWAVE PROPERTIES OF VOLTAGE-TUNABLE YBA2CU3O7-DELTA SRTIO3 COPLANAR WAVE-GUIDE TRANSMISSION-LINES/

To explore the electrical characteristics of monolithic microwave circ uits with integrated high-temperature superconductor and ferroelectric materials, we fabricated a series of coplanar waveguide transmission lines in laser-deposited YBa2Cu3O7-delta and SrTiO3 thin films. We cha racterized the voltage-tunable two-port microwave response of the tran smission lines at cryogenic temperatures using a calibrated network an alyzer system, Total phase shifts and phase tuning in these devices in creased for increasing ferroelectric film thickness with only moderate increases in transmission loss.