Sensitivity of R/sub s/-measurement of HTS thin films by three prime resonant techniques: cavity resonator, dielectric resonator, and microstrip resonator

Misra, Mukul; Kataria, N. D.; Pinto, R.; Tonouchi, Masayoshi; Srivastava, Pankaj

doi:10.1109/77.979855

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…In (1), p is the fitting parameter whose value has been varied from 1 to 4 to obtain the best fit of R s and X s with the experimentally observed results. The surface resistance R s and surface reactance X s are inferred from the measured changes in the unloaded Q-value, 3 db bandwidth, insertion loss, and resonant frequency with temperature (Kedar et al, 2002;Misra et al, 2001). The value of p as 1.65 gives the best fit.…”

Section: Surface Impedance Of Hts Stripmentioning

confidence: 99%

CAD Analysis of HTS Microstrip Patch Antenna Using a Spectral Domain Method

Kedar

2003

Electromagnetics

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An accurate full wave spectral domain technique is developed to evaluate the characteristic parameters of high-temperature superconducting (HTS) microstrip antennas (MSA). The analysis takes into account most of the practical operating conditions affecting the performance of MSA. A corresponding study of copper (Cu)-MSA has also been carried out to visualize the advantage of HTS-MSA over its normal counterpart.

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Section: Surface Impedance Of Hts Stripmentioning

confidence: 99%

CAD Analysis of HTS Microstrip Patch Antenna Using a Spectral Domain Method

Kedar

2003

Electromagnetics

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“…Ag-doped laser-ablated YBa 2 Cu 3 O 7−x thin film of thickness 400 nm has been deposited on a 10 mm × 10 mm × 0.5 mm thick LaAlO 3 (ε r = 24.5) substrate having a dc transition temperature, T c , of 89 K. The surface resistance of the unpatterned film has been measured through the cavity resonator technique using a sapphire-loaded TE 011 mode dielectric resonator [14], yielding a value of 0.8 m at 77 K and 10 GHz. Further, the patterning of the film has been done using conventional photolithography techniques followed by chemical etching, to fabricate a half-wavelength microstrip resonator providing fundamental resonance at 5 GHz with a thermally evaporated copper ground plane.…”

Section: Sample Preparationmentioning

confidence: 99%

Efficient analysis for nonlinear microwave characteristics of high-power HTS thin film microstrip resonators

Kedar

Kataria

2005

Supercond. Sci. Technol.

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This paper investigates the nonlinear effects of high-Tc superconducting (HTS) thin film in high-power applications. A nonlinear model for complex surface impedance has been proposed for the efficient analysis of the nonlinearity of HTS thin films. Further, using the developed model, analysis of HTS-MSR has been done using the spectral domain method (SDM). The SDM formulation has been modified to account for finite conductivity and thickness of HTS films by incorporating a complex resistive boundary condition. The results have been validated with the experiments performed with microstrip resonators (MSRs) based on YBa2Cu3O7−x (YBCO) thin films made by a laser ablation technique on LaAlO3 substrates, characterized for their characteristics, namely, resonant frequency and quality factor measured as a function of temperature and input RF power. A close agreement between the theoretical and measured results has been achieved validating the analysis.

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“…While the ultimate sensitivity is obtained with superconducting cavities [14], this method is definitely not feasible when the sample has to be characterized under a dc magnetic field. In this case, metallic cavities [15] or dielectric resonators in low-indices [16,17,18,19] as well as in whispering gallery modes [20,21,22,23] can be used. Dielectric resonators exhibit increased sensitivity, and more compact dimensions.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Resonators for the Measurements of the Surface Impedance of Superconducting Films

Pompeo

Torokhtii

Silva

2014

Measurement Science Review

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We present the development, realization and setup of dielectric resonators, for the purpose of measuring the surface impedance at microwave frequencies of superconducting thin films. We focus on resonators designed to operate in dc magnetic fields, optimized for the measurements of the variation of the surface impedance with the applied field. Two resonators, operating at 8 and 48 GHz, are presented. We discuss different approaches to the measurement of the resonator parameters, with particular attention to the nonidealities of real setups in a cryogenic environment. Finally, we present some sample measurement of high-T c and low-T c superconducting films.

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Sensitivity of R/sub s/-measurement of HTS thin films by three prime resonant techniques: cavity resonator, dielectric resonator, and microstrip resonator

Cited by 8 publications

References 14 publications

CAD Analysis of HTS Microstrip Patch Antenna Using a Spectral Domain Method

CAD Analysis of HTS Microstrip Patch Antenna Using a Spectral Domain Method

Efficient analysis for nonlinear microwave characteristics of high-power HTS thin film microstrip resonators

Dielectric Resonators for the Measurements of the Surface Impedance of Superconducting Films

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