We have examined a fabrication process of low surface resistance (Rs) YBa2C
u3O7-delta (YBCO) films on CeO2/Al2O3 substrates by a laser ablation techni
que. The surface morphology of CeO2 films depended on the film thickness of
CeO2. A critical value of the CeO2 film thickness at similar to 90 nm was
found above which the surface roughness increased abruptly. The Rs of YBCO
films also depended on the surface morphology of CeO2 films. The Rs value o
f YBCO films on thinner CeO2 films (< 90 nm) was quite smaller than that of
YBCO films on thicker CeO2 films (> 90 nm). We have also examined the high
-temperature superconducting (HTS) antenna as one of the HTS passive device
s, and measured the power handling capability. The compact cooling system f
or HTS patch antenna was constructed. (C) 2000 Elsevier Science B.V. All ri
ghts reserved.