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## Waveguide effects on quasispherical microwave cavity resonators.

Underwood, R J; Mehl, J B*; Pitre, L*; Edwards, G; Sutton, G; de Podesta, M (2010) Waveguide effects on quasispherical microwave cavity resonators. Meas. Sci. Technol., 21 (7). 075103

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## Abstract

The perturbing effect of a waveguide on the boundary of a quasispherical cavity resonator is investigated both theoretically and experimentally. Expressions for the frequency perturbation to the triply-degenerate ${\rm TM}_{1mn}$ and ${\rm TE}_{1mn}$ modes are derived using cavity perturbation theory. The fields in and around the waveguide are calculated in the static limit using finite-element software. Experiments made using quasispherical and cylindrical cavity resonators confirm the accuracy and generality of the approach. The impact of this study on attempts to re-determine the Boltzmann constant $(\kb)$ by an acoustic resonance technique is considered.

Item Type: Article Quasispherical resonator, microwave cavity perturbation, Boltzmann constant, primary thermometry Engineering MeasurementsEngineering Measurements > Thermal 02 Feb 2018 13:15 http://eprintspublications.npl.co.uk/id/eprint/4673