Variable Coupling Reflection Cavity for Microwave Spectroscopy

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Abstract
This paper describes the usefulness of a variable coupling resonant cavity for microwave spectroscopy. The variable coupling scheme achieves slightly greater sensitivity than does the usual microwave bridge circuit. It can single out either the absorption or dispersion component of a resonance signal without using bridge techniques. It is considerably less sensitive to microphonic noise than is the bridge. It is recommended for use in reflection‐type cavity spectrometers.