Title :
RF Attenuation Measurements Using Quantum Interference in Superconductors
Author :
Adair, Robert T. ; Simmonds, Michael Bancroft ; Kamper, Robert Andrew ; Hoer, Cletus A.
Abstract :
A unique portable system has been developed for measuring RF attenuation over a dynamic range of 62 dB at 30 MHz. A superconducting quantum interference device (SQUID) is the basis of the system. A SQUID is a loop of superconducting metal closed by a weak point contact called a Josephson junction, operating in liquid helium. It converts variations in magnetic flux to periodic variations in impedance which are sensed at microwave frequencies. This provides a convenient natural means of measuring electrical quantities such as voltage, current, power, and attenuation.
Keywords :
Attenuation measurement; Contacts; Dynamic range; Josephson junctions; Radio frequency; Radiofrequency interference; SQUIDs; Superconducting devices; Superconducting microwave devices; Superconductivity;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.1974.4314316
