Investigation of Higher Order Reentrant Modes of a Cylindrical Reentrant-Ring Cavity Resonator

Author

Yaohui Fan ; Zhengyu Zhang ; Carvalho, N.C. ; Le Floch, J.-M. ; Qingxiao Shan ; Tobar, M.E.

Author_Institution

ARC Centre of Excellence Eng. Quantum Syst. (EQuS), Univ. of Western Australia, Crawley, WA, Australia

Volume

62

Issue

8

fYear

2014

fDate

Aug. 2014

Firstpage

1657

Lastpage

1662

Abstract

Analysis of the properties of resonant modes in a reentrant cavity structure comprising of a post and a ring was undertaken and verified experimentally. In particular we show the existence of higher order reentrant cavity modes in such a structure. Results show that the new cavity has two re-entrant modes, one of which has a better displacement sensitivity than the single post resonator and the other with a reduced sensitivity. The more sensitive mode is better than the single post resonator by a factor of 2 to 1.5 when the gap spacing is below 100 μm. This type of cavity has the potential to operate as a highly sensitive transducer for a variety of precision measurement applications, in particular applications which require coupling to more than one sensitive transducer mode.

Keywords

cavity resonators; cylindrical reentrant-ring cavity resonator; displacement sensitivity; gap spacing; higher-order reentrant cavity modes; highly-sensitive transducer; reentrant cavity structure; resonant modes; sensitivity reduction; Australia; Cavity resonators; Educational institutions; Frequency measurement; Resonant frequency; Sensitivity; Transducers; ${ Q}$ factor; Finite-element method (FEM); reentrant cavity; reentrant-ring (RR) cavity; transducer;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2014.2331625

Filename

6843369