Losses in Cavity Resonators

Author: Baller, Howard

Year: 1946

Degree: Dissertation (Ph.D.)

Advisors: Mackeown, Samuel Stuart; Pickering, William Hayward; Hagelbarger, David

Committee Member: Unknown, Unknown

Option: Electrical Engineering

DOI: 10.7907/nmmx-dk82

Abstract

The problem investigated was the measurement of the Q, or figure of merit, of a resonant cavity and observation of the variation in Q with changes in the size and shape of the coupling holes. A method of measurement was developed using a spectrum analyzer as a detector and a signal with a known spectrum to calibrate the analyzer for frequency changes. The results indicate that the Q is lowered if the size of the coupling windows is increased. There are two contributions to the losses which may be considered separately; the losses on the inner walls of the resonator, and the losses due to energy radiated out of the coupling hole.

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