HIGH-FREQUENCY BROAD-BAND CHARACTERIZATION OF METAL HIGH-TC SUPERCONDUCTING COPLANAR STRUCTURES

High Tc structures have raised a great interest for microelectronics a pplications. We have investigated two layer coplanar structures made o f an Ag layer (200nm) sputtered on YBaCuO (300nm). The typical structu res are 50OMEGA coplanar lines and resonator bandpass filters (24 GHz) analyzed from 45MHz to 30GHz. Coplanar lines are studied in the norma l and superconducting states whereas filter shows transmitted signals only in the superconducting state. We propose a phenomenologic model t aking into account the two layers and their interface. At 60K and 10GH z, the Rs of our YBaCuO layer is roughly 1.5mOMEGA. A good consistency is observed among the different lines and resonating measurements.