EVALUATION OF NIOBIUM TRANSMISSION-LINES UP TO THE SUPERCONDUCTING GAP FREQUENCY

被引：7

作者：

DIERICHS, MMTM

FEENSTRA, BJ

SKALARE, A

HONINGH, CE

MEES, J

DEGRAAUW, T

VONDERSTADT, H

机构：

[1] UNIV GRONINGEN,DEPT APPL PHYS,9747 AG GRONINGEN,NETHERLANDS

[2] UNIV GRONINGEN,CTR MAT SCI,9747 AG GRONINGEN,NETHERLANDS

来源：

APPLIED PHYSICS LETTERS | 1993年 / 63卷 / 02期

关键词：

D O I：

10.1063/1.110356

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The frequency dependence of the coupling of niobium superconducting transmission lines is measured for frequencies up to and above the superconducting gap frequency. For this purpose superconducting microstrips are integrated in log-periodic planar antennas and the spectral response is measured by means of a Fourier transform spectrometer with 1 mum2 Nb/Al2O3/Nb SIS junctions as detectors. Resonances of microstrips are observed up to 650 GHz, the superconducting gap frequency of niobium, but above that frequency no resonances have been detected. The measured resonance frequencies are in good agreement with a dispersive model for superconducting transmission lines based on the Mattis-Bardeen theory. The radiation coupling is lower than calculated, indicating significant dielectric losses.

引用

页码：249 / 251

页数：3

共 13 条

[1]

COLLIN RE, 1966, F MICROWAVE ENG

[2]

DIERICHS MMT, 1992, 3RD P INT S SPAC TER, P522

[3] SUBMICRON NIOBIUM JUNCTIONS FOR SUBMILLIMETER-WAVE MIXERS USING OPTICAL LITHOGRAPHY [J].