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Fabrication of MOD-derived YBCO films on [001]LaAlO3 and their application to λ/4 CPW SIR BPFs

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4 Author(s)
Sanada, A. ; Dept. of Electr. & Electron. Eng., Yamaguchi Univ., Japan ; Kimura, Masao ; Yamamoto, T. ; Awai, I.

Chemically derived epitaxial thin films of YBa2Cu3O7-δ (YBCO) are fabricated on [001]LaAlO3 substrates by the metalorganic-deposition (MOD) process, which has advantages of high quality, nonvacuum, low-cost, and large-scale production of high-Tc superconducting films. The MOD-derived YBCO films have a sharp transition at the critical temperature (90.4 K) and a high-quality film with a surface resistance of 0.13 mΩ (30 K, 9.98 GHz) is obtained. As a microwave application, simple and compact bandpass filters (BPFs) using λ/4 coplanar-waveguide. stepped-impedance resonators are demonstrated on the YBCO films. A two-stage Chebyshev BPF of center frequency of 5.731 GHz, bandwidth of 135 MHz, and insertion loss of 0.29 dB with little input power dependency in a power range less than 10 dBm is realized on the film.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:50 ,  Issue: 12 )

Date of Publication:

Dec 2002

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