Title :
Evaluating superconducting resonator materials
Author :
McAvoy, B.R. ; Adam, J.D. ; Wagner, G.R.
Author_Institution :
Westinghouse R&D Center, Pittsburgh, PA, USA
Abstract :
Techniques for microwave evaluation of superconductors using microwave stripline resonators are examined. These resonators provide rapid measurement of microwave parameters with minimal constraints on processing. Sandwiched microstrip line resonators are used to compare the performance at 4.2 K of oxygen-free copper, lead films, niobium films and ceramic high-Tc films. Measurement at C-band (2.8 GHz) and X-band (7.6 GHz) are described. Typical results for a niobium film microstrip resonator show a loaded Q value of about 80000 with a transmission insertion loss of 5 dB at 3 GHz. Such high-Q microwave resonators have application in low-phase-noise reference oscillators. Preliminary results on the phase-noise performance of a Nb stripline resonator at 2.8 GHz are presented
Keywords :
microwave measurement; microwave oscillators; resonators; strip line components; superconducting devices; 2.8 GHz; 4.2 K; 7.6 GHz; C-band; Cu; Nb; Pb; X-band; ceramic high-Tc films; high-Q microwave resonators; loaded Q value; low-phase-noise reference oscillators; measurement of microwave parameters; microwave stripline resonators; phase-noise; stripline resonator; superconducting resonator materials; transmission insertion loss; Copper; Microstrip resonators; Microwave measurements; Microwave theory and techniques; Niobium; Stripline; Superconducting films; Superconducting materials; Superconducting microwave devices; Superconductivity;
Conference_Titel :
Frequency Control Symposium, 1988., Proceedings of the 42nd Annual
Conference_Location :
Baltimore, MD
DOI :
10.1109/FREQ.1988.27656
