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

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6 Author(s)
Yaohui Fan ; ARC Centre of Excellence Eng. Quantum Syst. (EQuS), Univ. of Western Australia, Crawley, WA, Australia ; Zhengyu Zhang ; Carvalho, N.C. ; Le Floch, J.-M.
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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.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:62 ,  Issue: 8 )