Reentrant cavities as electromechanical transducers

Barroso, Joaquim J.; Castro, P.J.; Aguiar, O. D.; Carneiro, L A

doi:10.1063/1.1688438

Cited by 22 publications

(10 citation statements)

References 10 publications

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“…Reentrant cylindrical cavities have been studied for more than 50 years [16]- [19] and have been implemented in multiple ways [20]- [24]. Previously, we constructed a tunable reentrant cavity, which consists of an empty cylindrical cavity and a cylindrical post in the centre of the cavity [25].…”

Section: Introductionmentioning

confidence: 99%

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

Fan

Zhang

Carvalho

et al. 2014

IEEE Trans. Microwave Theory Techn.

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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 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.Index Terms-Finite element method, Q-factor, reentrant cavity, transducer.

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Section: Introductionmentioning

confidence: 99%

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

Fan

Zhang

Carvalho

et al. 2014

IEEE Trans. Microwave Theory Techn.

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“…The microwave re-entrant cavity's high frequency selectivity to gap size fluctuations makes it also a unique device, capable of being developed for mechanical transducer applications [15][16][17]36] and for investigating the dynamical Casimir Effect [37]. The re-entrant cavity could also prove to be a useful tool for cavity based searches for axions [38] and axion-like particles, where the ability to tune over a large frequency range while maintaining low electrical losses and high E-field intensity would enable sensitive experiments that cover a wide region of parameter space.…”

Section: Introductionmentioning

confidence: 99%

“…The development of accurate structure modeling based on lumped element analysis [1][2][3][4][5][6][7] has made them very valuable for creating small volume high-Q resonators for filtering applications from room to cryogenic temperatures in comparison with large Whispering Gallery and Bragg mode resonant cavities [6][7][8][9][10][11]. Re-entrant cavities have also been used for producing displacement sensors for gravitational bar detectors [12][13][14][15][16][17], oscillators using Gunn diodes [18] and electron beam tubes [18], and for millimetre wave resonators [20][21]. Furthermore, the re-entrant cavity has a high frequency tuning capability, which make them very attractive for telecommunication systems [22][23][24][25] and characterizing dielectric materials as a function of frequency [26][27].…”

Section: Introductionmentioning

confidence: 99%

Rigorous analysis of highly tunable cylindrical transverse magnetic mode re-entrant cavities

Floch

Fan

Aubourg

et al. 2013

Review of Scientific Instruments

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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.

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“…A re-entrant cavity is a hollow, conducting resonant cavity containing a conducting rod [26][27][28][29] . A distinct feature of a reentrant cavity is the existence of a gap between the top of the rod and the lid of the cavity.…”

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confidence: 99%

Characterisation of Cryogenic Material Properties of 3D-Printed Superconducting Niobium using a 3D Lumped Element Microwave Cavity

McAllister¹,

Bourhill²,

Ma³

et al. 2020

Preprint

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We present an experimental characterisation of the electrical properties of 3D-printed Niobium. The study was performed by inserting a 3D-printed Nb post inside an Aluminium cylindrical cavity, forming a 3D lumped element re-entrant microwave cavity resonator. The resonator was cooled to temperatures below the critical temperature of Niobium (9.25K) and then Aluminium (1.2K), while measuring the quality factors of the electromagnetic resonances. This was then compared with finite element analysis of the cavity and a measurement of the same cavity with an Aluminium post of similar dimensions and frequency, to extract the surface resistance of the Niobium post. The 3D-printed Niobium exhibited a transition to the superconducting state at a similar temperature to the regular Niobium, as well as a surface resistance of 3.1 × 10 −4 Ω. This value was comparable to many samples of traditionally machined Niobium previously studied without specialised surface treatment. Furthermore, this study demonstrates a simple new method for characterizing the material properties of a relatively small and geometrically simple sample of superconductor, which could be easily applied to other materials, particularly 3D-printed materials. Further research and development in additive manufacturing may see the application of 3D-printed Niobium in not only superconducting cavity designs, but in the innovative technology of the future.

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Reentrant cavities as electromechanical transducers

Cited by 22 publications

References 10 publications

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

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

Rigorous analysis of highly tunable cylindrical transverse magnetic mode re-entrant cavities

Characterisation of Cryogenic Material Properties of 3D-Printed Superconducting Niobium using a 3D Lumped Element Microwave Cavity

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