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Investigation of the energy distribution in a re-entrant cavity.

Hill, G J; Lees, K; Blackburn, J; Clarke, R N (2001) Investigation of the energy distribution in a re-entrant cavity. In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

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This paper examines the ‘filling factor’ required to calculate the loss of materials measured in re-entrant cavities and discusses the key question of the correct method for determining the loss of the unloaded cavity. It has been usual in the past to determine this empirically. It is suggested that this leads to errors as the energy distribution in the unloaded cavity differs from that when the sample is present. To illustrate this issue and to help to resolve the question, experimental data are presented on low loss dielectric materials (HDPE and YAG). Values obtained with a re-entrant cavity are compared with those obtained with other methods in the frequency range 1.0 to 1800 MHz. It appears that modification of the current standard method is required for two reasons, but it is not yet clear what the preferred technique should be. Further studies are in progress.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: Electromagnetics
Electromagnetics > Electromagnetic Materials
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2216

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