Numerical study of vortex effects in superconducting microstrip lines

Andrews, Jolly; Mathew, Vinod

doi:10.1016/j.physc.2011.03.006

Cited by 7 publications

(6 citation statements)

References 41 publications

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“…Since a large number of terms of basis functions are needed forJ i 's expansion, we apply the Galerkin procedure to the unknown electric field component over the slot [1], [3], [4], [9]. Accordingly, the admittance elements get modified as given by Mathew et al [9].…”

Section: A Spectral Domain Modelingmentioning

confidence: 99%

“…4 we plot the variation of unloaded Q value with the reduced temperature for the different field values. We calculate the quality factor from the corresponding phase constant and attenuation value [3]. The Q value decreases as the temperature and the field values are gradually increased and the flux creep effects lower the unloaded quality factor.…”

Section: A Simulation At Different Temperaturesmentioning

confidence: 99%

“…The analysis will become more complicated due to the vortex movements when the HTS film is exposed to any external dc field [2]. The thermal effects also have considerable impact on the microwave signal propagation [3], [4], [5]. In this paper we present a simulation methodology to study the relationship between electromagnetic wave propagation and flux effects for a wide range of temperature, field and strip thickness.…”

Section: Introductionmentioning

confidence: 99%

“…The HTS microstrip line, resonator and Coplanar waveguide have been modeled and their propagation parameters have been analyzed in our earlier works [3], [4], [5]. In this work we study the impact of flux dynamics which include creep effect, flux flow phenomenon and vortex pinning on the microwave signal propagation and present a computation technique to specifically analyse this effect on the wave propagation.…”

Section: Introductionmentioning

confidence: 99%

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Computation of flux effects in high temperature superconducting coplanar waveguide

Andrews

Mathew

2014

2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applicati

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We present a simulation methodology of propagation parameters and study their relationship with flux effects in a High Temperature Superconducting (HTS) Coplanar Waveguide placed in an external magnetic field. The impact of vortex dynamics on the electromagnetic signal propagation is clearly made out for a wide range of applied field, temperature and strip thickness. The vortex effects are incorporated by using a complex dynamic mobility term proposed by Coffey and Clem (CC) in their modified two-fluid theory. The dyadic Green's functions in Spectral Domain are formulated accordingly by treating the surface impedance derived from CC model as a complex resistive boundary condition. The thermal and field effects are incorporated into the analysis in a self-consistent manner using CC model. By using the Galerkin's procedure, the propagation parameters are computed using Müller root finding method. The inclusion of flux dynamics significantly alter the signal attenuation which, in turn, determines the quality factor. The signal dispersion is kept to a minimum and the relationship between flux effects and the microwave signal propagation is explored.

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Section: A Spectral Domain Modelingmentioning

confidence: 99%

Section: A Simulation At Different Temperaturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Computation of flux effects in high temperature superconducting coplanar waveguide

Andrews

Mathew

2014

2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applicati

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“…In a recent paper, Ulmer et al [26] have reported the variation of quality factor of a superconducting NbTi resonator in a magnetic field for different temperatures. The dispersion characteristics of an HTS microstrip line in the mixed state have been studied recently and the influences of strip thickness and static field strength on propagation parameters were estimated using the CC model [27].…”

Section: Introductionmentioning

confidence: 99%

Magnetic field induced properties of type II superconducting microstrip resonators

Andrews¹,

Mathew²

2011

Supercond. Sci. Technol.

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The vortex effects of high temperature superconducting (HTS) microstrip resonators have been studied using the theoretical approach developed by Coffey and Clem (CC). A rectangular HTS strip resonator printed on sapphire substrate and subjected to a static magnetic field is considered, where the HTS strip is in the mixed state. An impedance type Green's function is derived which connects the strip current to the electric field around the resonator, in the Fourier transformed domain. Galerkin's procedure is used in the spectral domain to determine the resonant frequency and the unloaded Q value, both of which are computed for different applied fields, reduced temperatures and superconducting strip thicknesses. The results reveal considerable influence of applied field on resonant frequency and quality factor due to vortex motion, which should be considered when designing resonators which operate under external magnetic field.

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Propagation Characteristics of Superconducting Slotlines in Vortex State

Andrews

Mathew

2015

J Supercond Nov Magn

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Numerical study of vortex effects in superconducting microstrip lines

Cited by 7 publications

References 41 publications

Computation of flux effects in high temperature superconducting coplanar waveguide

Computation of flux effects in high temperature superconducting coplanar waveguide

Magnetic field induced properties of type II superconducting microstrip resonators

Propagation Characteristics of Superconducting Slotlines in Vortex State

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