Nonlinear Microwave Properties of Superconducting YBaCuO and Dielectric MgO

Author

Hein, M.A. ; Hirst, P.J. ; Humphreys, R.G. ; Park, S.-H. ; Seron, D. ; Oates, D.E.

Author_Institution

Technical University of Ilmenau, Department of RF & Microwave Techniques, PO Box 100565, 98684 Ilmenau, Germany, Phone +49 (3677)69-2831.

fYear

2003

fDate

Oct. 2003

Firstpage

1303

Lastpage

1306

Abstract

We have investigated the nonlinear properties of high-temperature superconducting films on MgO substrates for microwave applications in the UHF-range. Surface impedance and two-tone frequency intermodulation are different sources of nonlinear microwave response, which are subtly related. We have found correlations between the microwave response of the superconducting films and their electronic and structural properties, which are essential to optimise the device performance. Furthermore, for the first time, we have observed a nonlinear dielectric loss tangent of MgO at temperatures up to 70 K. The dielectric losses contribute significantly to intermodulation distortion. Our findings are relevant for conventional and super-conducting microwave components involving usual dielectric materials like MgO. The results may also prove helpful for the development of novel RF dielectrics.

Keywords

Dielectric losses; Dielectric materials; Dielectric substrates; Frequency; High temperature superconductors; Intermodulation distortion; Superconducting films; Superconducting microwave devices; Surface impedance; Yttrium barium copper oxide;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2003 33rd European

Conference_Location

Munich, Germany

Print_ISBN

1-58053-834-7

Type

conf

DOI

10.1109/EUMA.2003.340858

Filename

4143264