Browsing by Author "Kander, R. G."

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    Measuring Microwave Shielding Effectiveness in Liquid-Nitrogen
    Namboodri, S. L.; Davis, William A.; Kander, R. G. (AIP Publishing, 1994-04-01)
    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 MHz. Verification of the waveguide fixture was accomplished by measuring the shielding effectiveness of a good conductor, coppper; 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 YBa2Cu3O7-x, a high temperature superconductor, with copper, a known shielding material.