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

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