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This work establishes the possible sources of nonlinear microwave response in perfect epitaxially-grown single-crystal HTS YBa2Cu3O7-δ (YBCO) thin films, their origin and conditions at which they become essential, as well as possibilities for their mitigation. Microwave measurements of YBCO thin film coplanar and strip-line resonators are performed at different experimental conditions. The nonlinear...
This work investigates the effect of single pulse magnetic field on microwave characteristics of YBCO thin film strip-line resonator such as the quality factor Q and resonant frequency F, and their evolution during the flux creep process at different temperatures and input power levels. It was shown that: (i) induced magnetic flux and screening dc current, resulting from the pulse action, noticeably...
The microwave properties of the 2-, 3- and 4-pole microwave filters, based on coupled surface wave resonators (SWR) made of high-temperature superconductor (HTS) film on dielectric substrate were investigated. The analysis of the systems is made by the partial wave synthesis (PWS) method. The normalized amplitude- frequency curve (AFC) is calculated for the Ka-band microwave filters.
Nonlinear microwave response of high-Tc superconductors (HTS) at high circulating power limits the applicability of HTS resonators to the few-mW level. Methods of spatially-resolved RF analysis are needed to identify the nonlinear sources as well as to establish their relative influence on the global response. In this work laser scanning microscopy is used to analyze the spatial correlation of linear...
Microwave properties of the surface wave resonator (SWR) consist of high-temperature superconductor (HTS) film on dielectric substrate were investigated. The analysis of the systems is made for a film with an array of HTS Josephson junctions (JJ). In the last case it was revealed the Josephson junction synchronization effect, occurred under the influence of electromagnetic field (EMF) of the SWR....
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