title: Rigorous analysis of highly tunable cylindrical transverse magnetic mode re-entrant cavities.
abstract: Cylindrical re-entrant cavities are unique three-dimensional structures that resonate with their electric and magnetic fields in separate parts of the cavity. To further understand these devices, we undertake rigorous analysis of the properties of the resonance using "in-house" developed Finite Element Method (FEM) software capable of dealing with small gap structures of extreme aspect ratio. Comparisons between the FEM method and experiments are consistent and we illustrate where predictions using established lumped element models work well and where they are limited. With the aid of the modeling we design a highly tunable cavity that can be tuned from 2 GHz to 22 GHz just by inserting a post into a fixed dimensioned cylindrical cavity. We show this is possible, as the mode structure transforms from a re-entrant mode during the tuning process to a standard cylindrical transverse magnetic mode.
authors.affiliation: School of Physics, University of Western Australia, 35 Stirling Hwy, 6009 Crawley, Western Australia, Australia.
authors.forename: J-M
authors.initials: JM
authors.lastname: Le Floch
authors.affiliation: School of Physics, University of Western Australia, 35 Stirling Hwy, 6009 Crawley, Western Australia, Australia.
authors.forename: Y
authors.initials: Y
authors.lastname: Fan
authors.affiliation: XLIM, UMR CNRS No. 6172, 123 av. A. Thomas, 87060 Limoges Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Aubourg
authors.affiliation: XLIM, UMR CNRS No. 6172, 123 av. A. Thomas, 87060 Limoges Cedex, France.
authors.forename: D
authors.initials: D
authors.lastname: Cros
authors.affiliation: School of Physics, University of Western Australia, 35 Stirling Hwy, 6009 Crawley, Western Australia, Australia.
authors.forename: N C
authors.initials: NC
authors.lastname: Carvalho
authors.affiliation: School of Physics, University of Western Australia, 35 Stirling Hwy, 6009 Crawley, Western Australia, Australia.
authors.forename: Q
authors.initials: Q
authors.lastname: Shan
authors.affiliation: School of Physics, University of Western Australia, 35 Stirling Hwy, 6009 Crawley, Western Australia, Australia.
authors.forename: J
authors.initials: J
authors.lastname: Bourhill
authors.affiliation: School of Physics, University of Western Australia, 35 Stirling Hwy, 6009 Crawley, Western Australia, Australia.
authors.forename: E N
authors.initials: EN
authors.lastname: Ivanov
authors.affiliation: XLIM, UMR CNRS No. 6172, 123 av. A. Thomas, 87060 Limoges Cedex, France.
authors.forename: G
authors.initials: G
authors.lastname: Humbert
authors.affiliation: XLIM, UMR CNRS No. 6172, 123 av. A. Thomas, 87060 Limoges Cedex, France.
authors.forename: V
authors.initials: V
authors.lastname: Madrangeas
authors.affiliation: School of Physics, University of Western Australia, 35 Stirling Hwy, 6009 Crawley, Western Australia, Australia.
authors.forename: M E
authors.initials: ME
authors.lastname: Tobar