4 January 1994 Two-tone intermodulation distortion in high-Tc superconducting thin films
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Two tone intermodulation distortion (IMD) in High Tc YBCO superconducting films on LaAl2O3 substrates are experimentally studied. Experiments performed on straight through microstrip transmission lines indicate highly non-linear signal transmission characteristics for these films. In addition to the third harmonic, higher order intermodulation products are also observed even without using any resonant structures. The observed intermodulation distortion shows a minimum as a function of temperature for a given input power level. Close to Tc, in addition to a large increase in IMD, higher order intermodulation products also become appreciable. SEM photographs are used to relate the surface topology of the films and the grain boundaries to the observed IMD. Thin films deposited by various techniques are investigated.
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Altan M. Ferendeci, Altan M. Ferendeci, Shih Lin Lu, Shih Lin Lu, Charles M. Jackson, Charles M. Jackson, Kul B. Bhasin, Kul B. Bhasin, Carl H. Mueller, Carl H. Mueller, } "Two-tone intermodulation distortion in high-Tc superconducting thin films", Proc. SPIE 2156, High Tc Microwave Superconductors and Applications, (4 January 1994); doi: 10.1117/12.166147; https://doi.org/10.1117/12.166147

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