PLANAR MICROWAVE DEVICES FABRICATED BY ION-IMPLANTATION PATTERNING OFHIGH-TEMPERATURE SUPERCONDUCTORS

We have applied ion-implantation inhibit patterning as a new method of fabricating low-loss microwave transmission lines in high-temperature superconductor thin films. To determine the effectiveness of this tec hnique, we-fabricated coplanar waveguide transmission lines in YBa2Cu3 O7-delta thin films that had been deposited on LaAlO3 substrates using pulsed laser deposition. Microwave characterizations of these lines a re compared to a reference line fabricated with conventional ion milli ng. At 76 K and 12 GHz, the attenuation constants of the ion-implanted transmission lines are approximated 0.02 dB/mm, and the overall loss response is indistinguishable from that of the ion-milled device. (C) 1996 American Institute of Physics.