Capacitance Evaluation on Parallel-Plate Capacitors  by Means of Finite Element Analysis

Izquierdo, Saturnino Catalán; Bueno-Barrachina, Jose-M.; Peñuelas, César Santiago Cañas; Sesé, Francisco Cavallé

doi:10.24084/repqj07.451

Cited by 17 publications

(9 citation statements)

References 9 publications

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“…Through optical profiler measurements, we observe that the voltage required to reach a roughness of about 900 nm has decreased from 5 kV to 3.5 kV, a reduction of 30%. We hypothesize that edge effects and charge accumulation around punctures in the film amplify local electric fields, as has been observed previously for capacitors 55 , 56 . This amplified field reduces the minimum voltage necessary to actuate the surface near the punctures.…”

Section: Resultssupporting

confidence: 72%

Fault-Tolerant Electro-Responsive Surfaces for Dynamic Micropattern Molds and Tunable Optics

Lin

Wang

Zhang

et al. 2017

Sci Rep

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Electrically deformable surfaces based on dielectric elastomers have recently demonstrated controllable microscale roughness, ease of operation, fast response, and possibilities for programmable control. Potential applications include marine anti-biofouling, dynamic pattern generation, and voltage-controlled smart windows. Most of these systems, however, exhibit limited durability due to irreversible dielectric breakdown. Lowering device voltage to avoid this issue is hindered by an inadequate understanding of the electrically-induced wrinkling deformation as a function of the deformable elastic film thickness. Here we report responsive surfaces that overcome these shortcomings: we achieve fault-tolerant behavior based on the ability to self-insulate breakdown faults, and we enhance fundamental understanding of the system by quantifying the critical field necessary to induce wrinkles in films of different thickness and comparing to analytical models. We also observe new capabilities of these responsive surfaces, such as field amplification near local breakdown sites, which enable actuation and wrinkle pattern formation at lower applied voltages. We demonstrate the wide applicability of our responsive, fault-tolerant films by using our system for adjustable transparency films, tunable diffraction gratings, and a dynamic surface template/factory from which various static micropatterns can be molded on demand.Dynamic control of surface topography and roughness is highly desired for its potential to accomplish what is difficult for traditional static surfaces to achieve, such as adjustable wettability 1 , smart adhesion 2 , antifouling abilities 3 , tunable light diffraction 4 , e-skin and stretchable devices 5,6 . Depending on the material's mechanical properties, such surfaces can show a variety of topographies during deformation, including wrinkling (or buckling), formation of localized ridges, period-doubling, creasing, and delamination 7,8 . Several methods have been used to induce such surface deformation, such as in-plane mechanical compression 9-11 , relaxation after depositing thin films on pre-stretched substrates [12][13][14][15][16][17] , thermal expansion mismatch after cooling thin films deposited on hot substrates [18][19][20][21][22] , ion irradiation 23,24 , differential swelling of film layers 2,[25][26][27][28][29] , and electric-field-induced deformation [30][31][32] . Among these various approaches, electric-field-induced deformation is particularly attractive due to its ability to reversibly actuate at high frequency and its potential for miniaturization and programmable control 33 . This type of deformation relies on the concept of voltage-induced electromechanical instability 34-39 , a phenomenon frequently observed in dielectric elastomer actuators (DEAs) [40][41][42][43][44][45] . Wang and Zhao, for example, have produced creased/cratered/wrinkled structures by immobilizing a DEA on a rigid substrate 32,46 . This DEA-like system is composed of four layers from top to bottom: a conductive li...

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Section: Resultssupporting

confidence: 72%

Fault-Tolerant Electro-Responsive Surfaces for Dynamic Micropattern Molds and Tunable Optics

Lin

Wang

Zhang

et al. 2017

Sci Rep

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“…As expected, the capacitors with the smaller area are more influenced by the edge effects, which becomes dominated by the reduced linearity of the electric field vector. The ratio between real to ideal capacitance is described as [10]…”

Section: B Capacitor Tests and Resultsmentioning

confidence: 99%

Design and Performance of Additively Manufactured In-Circuit Board Planar Capacitors

Sokol¹,

Yamada²,

Nulman

2021

IEEE Trans. Electron Devices

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This article discusses the design and performance of planar capacitors built as pairs of conductive plates by additive manufacturing as part of an electronic circuit board. This article covers several geometries and layers of parallel plates that allow for different capacitance values, from a few picofarads (pF) to several nanofarads (nF). The dc, ac, and radio frequency (RF) characterization demonstrated superior performance compared to off-the-shelve surface mount device (SMD) capacitors up to 20 GHz. The additively manufactured capacitors exhibit breakdown voltages in excess of 1 kV and subpicoampere leakage currents, while the change in RF impedance changes, as a function of frequency, is a factor of 3× smaller than SMD capacitors.

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“…We will refer to these breakdowns as edge BDs. The increased BD density near the edges is currently explained by locally enhanced electric fields in the region [31,32].…”

Section: E Other Parts Of the Measurements And Analysismentioning

confidence: 99%

Classification of vacuum arc breakdowns in a pulsed dc system

Saressalo

Kyritsakis

Djurabekova

et al. 2020

Phys. Rev. Accel. Beams

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Understanding the microscopic phenomena behind vacuum arc ignition and generation is crucial for being able to control the breakdown rate, thus improving the effectiveness of many high-voltage applications where frequent breakdowns limit the operation. In this work, statistical properties of various aspects of breakdown, such as the number of pulses between breakdowns, breakdown locations and crater sizes are studied independently with almost identical Pulsed DC Systems at the University of Helsinki and in CERN. In high-gradient experiments, copper electrodes with parallel plate capacitor geometry, undergo thousands of breakdowns. The results support the classification of the events into primary and secondary breakdowns, based on the distance and number of pulses between two breakdowns. Primary events follow a power law on the log-log scale with the slope α ≈ 1.30, while the secondaries are highly dependent on the pulsing parameters.

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Capacitance Evaluation on Parallel-Plate Capacitors by Means of Finite Element Analysis

Cited by 17 publications

References 9 publications

Fault-Tolerant Electro-Responsive Surfaces for Dynamic Micropattern Molds and Tunable Optics

Fault-Tolerant Electro-Responsive Surfaces for Dynamic Micropattern Molds and Tunable Optics

Design and Performance of Additively Manufactured In-Circuit Board Planar Capacitors

Classification of vacuum arc breakdowns in a pulsed dc system

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