RF Power Properties of YBCO-Film/LAO Microstrip Disk Resonators for 4 GHz Band

Kazunori YAMANAKA  Akihiko AKASEGAWA  Manabu KAI  Teru NAKANISHI  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.2   pp.156-162
Publication Date: 2006/02/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.2.156
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Superconducting High-frequency Devices)
YBCO,  LAO,  RF,  power,  disk,  resonator,  

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This paper presents RF power properties of YBCO films on LaAlO3 substrate examined using microstrip disk shape-patterned resonators for around 4 GHz. Characterization of the YBCO films for the resonators was carried out. For input-output power measurement, the resonators with the condition of strong I/O couplings were designed and fabricated. The RF power properties of the resonators at cryogenic temperatures were measured. The resonator condition to obtain the handling power over 10 W at 30 and 70 K was confirmed. The temperature dependence of the break-down powers at 4 GHz for the resonators showed two broad peaks. We discuss the unique phenomenon with magnetic flux model, as referred to the YBCO films characteristics results.