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Measurement of Resonant-Cavity Characteristics

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2 Author(s)
G. L. Hall ; Formerly Fed. Telecommun. Labs. (a division of IT & T Corp.), now at University of Virginia ; Philip Parzen

The circuit properties of a resonant cavity are effectively described by its loaded Q, unloaded Q, and shunt resistance. One method of Q measurement depends on an accurate knowledge of the variation of VSWR as a function of frequency in a transmission line terminated by the resonant cavity. A method of measuring shunt resistance along any path in the cavity entails accurate observation of the resonant-frequency shifts caused by an obstacle placed at points along the path. Therefore, both measurements require an AFC system with good stability and high resolution. The parameters of a re-entrant cavity with apertures are considered and the associated experimental setup is described.

Published in:

Proceedings of the IRE  (Volume:41 ,  Issue: 12 )