Title :
A new technique for measuring the microwave properties of high temperature superconducting rods
Author :
Minakovic, B. ; Holt, T. ; Dew-Hughes, D.
Author_Institution :
Dept. of Eng. Sci., Oxford Univ., UK
fDate :
7/15/1894 12:00:00 AM
Abstract :
This paper presents a new technique capable of investigating anisotropy in high temperature superconducting rods using two closely-spaced modes in a co-axial copper cavity at frequencies around 20 GHz. The two-mode method of anisotropy evaluation is shown to be simple and reliable. So far, R/sub sa//R/sub sc/ ratios as low as 0.5 have been achieved by zone annealing. Frequency dependence can also be measured by sweeping additional modes.<>
Keywords :
electric resistance measurement; high-temperature superconductors; microwave measurement; 20 GHz; TE/sub 011/ mode; TEM /sub 002/ mode; anisotropy evaluation; closely-spaced modes; coaxial Cu cavity; frequency dependence; high temperature superconducting rods; microwave properties measurement; surface resistance; two-mode method; zone annealing; High-temperature superconductors; Microwave measurements; Resistance measurement;
Conference_Titel :
What's New in Microwave Measurements (Digest No.1994/042), IEE Colloquium on
