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A Study on Transmission Properties of YBa2Cu3Oy Coplanar Waveguide on LiNbO3 Substrate
IEICE TRANSACTIONS on Electronics
Publication Date: 1992/08/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Cryogenic Microwave Devices)
Category: Passive Devices
transmission properties, coplanar waveguide, LiNbO3, YBa2Cu3Oy, attenuation constants,
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This paper describes on the transmission properties of the superconducting coplanar waveguide on LiNbO3 (LN) substrates, fabricated by YBa2Cu3Oy (YBCO) superconducting films. The films have been prepared by the reactive co-evaporation method and patterned by a wet etching process. The surface resistance of the obtained film was 0.04 Ω at 18 GHz and 77 K. It was confirmed from X-ray diffraction (XRD) that these films were highly oriented to the direction of c-axis without a secondary phase. The microwave transmission properties of these YBCO coplanar waveguides were investigated at frequencies up to 20 GHz and compared with that of the aluminum coplanar waveguide. The characteristic impedances of both coplanar waveguides were designed to be 50 Ω. It was found that the attenuation constants of these samples at 77 K were less than that of the aluminum coplanar waveguide for frequencies below 18 GHz.