Development of a Millimeter-Wave Coaxial Cable Measurement System at Cryogenic Temperature and Measurement of the Surface Resistance of High-Tc Superconductor Films

Toru HASHIMOTO  Yoshio KOBAYASHI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.3   pp.720-724
Publication Date: 2002/03/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Superconductive Electronics)
Category: Microwave Devices and Systems
Keyword: 
millimeter wave,  cryogenic temperatures,  surface resistance,  high-Tc superconductor,  

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Summary: 
A coaxial cable measurement system applicable up to 60 GHz in the cryogenic temperature is developed by using V-connectors. In this system, the fine location of coupling loop antennas can be adjusted by three-dimensional mechanical stages in the low temperature region. In order to verify usefulness of this system, the temperature dependence of surface resistance (Rs) of Y-Ba-Cu-O (YBCO) films was measured at 30 GHz by the two-dielectric resonator method using TE011- and TE013- mode sapphire rod resonators. The measured result of Rs was 0.5 mΩ at 30 GHz and 20 K, which was 1/40, compared with those of copper plates.