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Measuring microwave shielding effectiveness in liquid nitrogen.

Author(s) : NAMBOODRI S. L., DAVIS W. A., KANDER R. G.

Type of article: Article

Summary

A technique to distinguish between materials that can and cannot shield microwaves in liquid nitrogen was developed. The samples are placed in a modified X-band waveguide, which operates by the same "insertion loss" principle as a coaxial device used to measure shielding effectiveness from 300 to 1000 megahertz. Verification of the waveguide fixture was accomplished by measuring the shielding effectiveness of a good conductor, copper, a nonconductor, Teflon, and two intermediate conductors, steel and a carbon-filled elastomer. After verification, the waveguide fixture was used at liquid nitrogen temperatures to compare the shielding effectiveness of YBCO(-), a high-temperature superconductor, with copper, a known shielding material.

Details

  • Original title: Measuring microwave shielding effectiveness in liquid nitrogen.
  • Record ID : 1995-0010
  • Languages: English
  • Source: Rev. sci. Instrum. - vol. 65 - n. 4
  • Publication date: 1994/04
  • Document available for consultation in the library of the IIR headquarters only.

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