RF Attenuation Measurement System Using a SQUID

This report describes a unique portable system for measuring attenuation at 30 MHz over a range of 50 dB to an accuracy of 0.005 dB per 20 dB. This system does not require any reference standard. A SQUID (Superconducting Quantum Interference Device) with its associated instrumentation is used to det...

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Bibliographic Details
Main Authors: Adair,Robert T, Frederick,Nolan V, Sullivan,Donald B
Format: Report
Language:English
Subjects:
ACCURACY
ATTENUATION
Electricity and Magnetism
JOSEPHSON JUNCTIONS
LIQUID HELIUM
LPN-DA-2761446
MEASURING INSTRUMENTS
QUANTUM ELECTRONICS
RADIOFREQUENCY
Superconducting Quantum Interference Device
SUPERCONDUCTIVITY
Test Facilities, Equipment and Methods
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Description
Summary:This report describes a unique portable system for measuring attenuation at 30 MHz over a range of 50 dB to an accuracy of 0.005 dB per 20 dB. This system does not require any reference standard. A SQUID (Superconducting Quantum Interference Device) with its associated instrumentation is used to determine attenuation in terms of Bessel Function Zeros. A SQUID is a loop of superconducting metal closed by a weak point contact called a Josephson junction, operating in liquid helium. The system specifications, description, and theory of operation are presented. A complete system operating procedure including data reduction techniques is given along with a discussion of sources of errors. Considerable additional information and diagrams are presented as an aid to the user in understanding and operating the system. (Author)