TELECOMMUNICATIONS AND RADIO ENGINEERING - 2010 Vol. 69,
No 15 		 

 

 

 

DC-Biased Coplanar Waveguide on the Basis of High-Tc Superconducting Thin Film with Nonlinear Impedance


N.T. Cherpak, A.A. Lavrinovich, A.I. Gubin
1A. Usikov Institute of Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkiv 61085, Ukraine
A.A. Kalenyuk, V.M. Pan
Institute of Metal Physics, National Academy of Sciences of Ukraine
Kiev, 03142 Ukraine
V. Khramota
National Technical University-KhPI, Kharkiv, 61002 Ukraine
A.A. Kurakin, S.A. Vitusevich
Institute of Bio- and Nanosystems, Forschungszentrum Juelich
Juelich, D52425 Germany
«Address all correspondence to N.T. Cherpak E-mail: cherpak@ire.kharkov.ua

Abstract
Nonlinear properties of coplanar waveguide developed on the base of high temperature superconductor (HTS) YBa2Cu3O7-? epitaxial thin film sputtered on single crystal Al2O3 substrate are investigated in X-band and temperature interval from 77K to 90K. It is shown that application of dc-bias to the structure allows controlling the microwave nonlinearity of HTS transmission line. The observed periodic features in losses as a function of temperature indicate that a phase coefficient of propagation constant has nonlinear behaviour related to the properties of transmission line. The phenomenological characteristic value of the input power Po is determined from comparison experimental data with results of theoretical analysis.
KEY WORDS: coplanar waveguide, high temperature superconductor (HTS), HTS transmission line, microwave nonlinearity

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pages 1357-1364

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