The effect of superconducting ground plane on microwave characteristics of unpatterned superconducting films in the mixed state

Chien Jang Wu, M. H. Tsai, H. D. Yang, Yu Sheng Tsai

研究成果: 雜誌貢獻文章

摘要

The microwave characteristics of a multilayer structure made of a type-II superconducting thin film and a dielectric substrate together with a superconducting ground plane is studied theoretically by using the model of the self-consistent treatment of vortex dynamics. The dependence of reflection coefficient on the temperature and static magnetic field is reduced owing to the existence of the superconducting ground plane, especially at temperatures near Tc and at higher fields. Comparison of the interesting oscillation phenomenon in the associated effective surface resistance between the Meissner state (b - 0) and mixed state (b ≠ 0) is made. We find that the superconducting ground plane not only strongly narrows down the resonant peak shape but also enhances the peak height. Finally, a similar layered structure made of a superconducting thin film on a dielectric substrate shielded by a buffer layer is also considered. We specifically demonstrate that the buffer layer has essentially no substantial influence on microwave reflectance, transmittance, and complex surface impedance. The role played by the buffer layer is in great contrast to that in a planar transmission line.

原文英語
頁(從 - 到)192-202
頁數11
期刊IEEE Transactions on Applied Superconductivity
8
發行號4
DOIs
出版狀態已發佈 - 1998 十二月 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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