Date of Award
Spring 1989
Document Type
Thesis - Restricted
Degree Name
Master of Science (MS)
Department
Civil, Construction, and Environmental Engineering
First Advisor
Ishii, Thomas K.
Second Advisor
Jeutter, Dean C.
Third Advisor
Hyde, James
Abstract
The effects of circulator leakage in ESR bridges are investigated. These effects are more prominent in microstrip ESR bridges with low noise amplifiers. The properties of lossless three ports are examined . It is shown that perfect circulation occurs when the complex junction impedance of the circulator is matched to the characteristic impedance of the transmission line. Calibrated, swept frequency, microstrip circulator measurements are made. Based on the measured complex junction impedance of a typical microstrip circulator, a tunable, narrow bandwidth, microstrip matching circuit is designed to improve the isolation of the microstrip circulator. Performance tests of this matching circuit show it is suitable for use in a high sensitivity microstrip ESR bridge.
Recommended Citation
Knoll, Douglas Alan, "Tuning of Microstrip Circulators for Maximum Sensitivity in ESR Bridges" (1989). Master's Theses (1922-2009) Access restricted to Marquette Campus. 4928.
https://epublications.marquette.edu/theses/4928