Title :
Improvements in the millimeter-wave system for Josephson junction array voltage standard systems
Author :
Yoshida, H. ; Sakamoto, Y. ; Klein, U. ; Endo, T.
Author_Institution :
Advantest Sendai Lab. Co. Ltd., Sendai, Japan
Abstract :
Improvements in the millimeter-wave system have been made in order to generate higher and more accurate Josephson voltages directly. The 94-GHz oscillator operator output power has been increased to 90 mW by incorporating a novel InP Gunn diode, and a low-loss dielectric waveguide has been installed in liquid helium in order to increase the millimeter-wave power available at the input of the Josephson junction array chip. The stability of the millimeter-wave frequency has been improved to the order of 10/sup -11/. The losses of the waveguide-to-microstrip transition has been investigated but remain a matter for further improvement.<>
Keywords :
Gunn oscillators; III-V semiconductors; Josephson effect; indium compounds; measurement standards; microwave measurement; superconducting junction devices; 90 mW; 94 GHz; InP; InP Gunn diode; Josephson junction array; low-loss dielectric waveguide; millimeter-wave system; oscillator operator output power; stability; voltage standard systems; waveguide-to-microstrip transition; Dielectric liquids; Diodes; Gunn devices; Indium phosphide; Josephson junctions; Liquid waveguides; Oscillators; Power generation; Voltage; Waveguide junctions;
Conference_Titel :
Microwave Symposium Digest, 1993., IEEE MTT-S International
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
0-7803-1209-0
DOI :
10.1109/MWSYM.1993.276796
