Investigation of space filling capacitors

Moselhy, Tarek; Ghali, Hani A.; Ragaie, H.F.; Haddara, H.

doi:10.1109/icm.2003.237831

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…In fractal geometry, a space-filling curve is a continuous curve that can completely fill up higher-dimensional spaces such as a 2D unit square; it is a curve with an infinite length property on a finite area. The mathematical concept of space-filling curves has been employed by electronics to realize stretchable device design (26) and by capacitors to improve capacitance (25). Herein, to increase the cell length, a Peano curve in fractal geometry was adapted as the printed pattern, since it is reported to have a larger slot length relative to side length compared to other space-filling curves (25), meaning a larger cell length per unit area.…”

Section: Resultsmentioning

confidence: 99%

“…The mathematical concept of space-filling curves has been employed by electronics to realize stretchable device design (26) and by capacitors to improve capacitance (25). Herein, to increase the cell length, a Peano curve in fractal geometry was adapted as the printed pattern, since it is reported to have a larger slot length relative to side length compared to other space-filling curves (25), meaning a larger cell length per unit area. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…By optimizing the printing parameters, an ultrahigh voltage of 192 V was achieved on a small strip of paper under ambient conditions by connecting 175 cells in series. By adapting the mathematical space-filling curves as the printed pattern to increase the cell length (25,26), the planar cell can achieve a short-circuit current of 170 μA and the power density can reach 2.5 mW cm −3 with energy density up to 0.41 mWh cm −3 , which is comparable to that of lithium thin-film batteries (27). The output voltage and current are readily adjustable by arranging well-defined patterns in parallel and series connections.…”

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confidence: 99%

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A moisture-enabled fully printable power source inspired by electric eels

Yang

Liu

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Great efforts have been made to build integrated devices to enable future wearable electronics; however, safe, disposable, and cost-effective power sources still remain a challenge. In this paper, an all-solid-state power source was developed by using graphene materials and can be printed directly on an insulating substrate such as paper. The design of the power source was inspired by electric eels to produce programmable voltage and current by converting the chemical potential energy of the ion gradient to electric energy in the presence of moisture. An ultrahigh voltage of 192 V with 175 cells in series printed on a strip of paper was realized under ambient conditions. For the planar cell, the mathematical fractal design concept was adapted as printed patterns, improving the output power density to 2.5 mW cm−3, comparable to that of lithium thin-film batteries. A foldable three-dimensional (3D) cell was also achieved by employing an origami strategy, demonstrating a versatile design to provide green electric energy. Unlike typical batteries, this power source printed on flexible paper substrate does not require liquid electrolytes, hazardous components, or complicated fabrication processes and is highly customizable to meet the demands of wearable electronics and Internet of Things applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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A moisture-enabled fully printable power source inspired by electric eels

Yang

Liu

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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“…Las curvas de llenado fractales tienen la característica particular de aumentar su períme-tro manteniéndose confinadas en la misma área (ver figura 1), lo cual las hace atractivas para la miniaturización de estructuras electromagnéticas. Recientemente algunas de estas curvas se han utilizado para reducir el tamaño de los dispositivos electromagnéticos y de los dispositivos electrostáticos (Chen y Wang, 2008;Ghali y Moselhy, 2004b;Moselhy, Ghali, Ragaie y Haddara, 2003). …”

Section: Curvas De Llenado Fractalesunclassified

Híbrido rat-race miniaturizado para la banda ISM 2,4 GHZ

Paez

Fajardo

Rueda

2014

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En este artículo se presenta el diseño, la implementación y la evaluación de un híbrido Rat-race miniaturizado, construido en un substrato CER-60 con líneas de transmisión (LxTx) tipo microcinta, siguiendo una curva de llenado fractal novedosa. Este circuito es el resultado principal del proyecto de investigación PS 3206 financiado por la Vicerrectoría Académica de la Pontificia Universidad Javeriana. El híbrido desarrollado logra una miniaturización del 73 %, opera en la banda ISM 2,4 GHz, con una frecuencia de operación óptima de 2,56 GHz y un ancho de banda fraccional de 17,15%.

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“…Fractal-based electrical devices have been formerly demonstrated which includes fractal capacitors, fractal sensors, fractal transformers and fractal antennas. Fractal capacitors have high capacitance density in a single layer process (Samavati et al, 1998;Kumar and Rao, 2016;Moselhy et al, 2003), fractal sensors have smart sensing and compact size (Mashraei et al, 2016), fractal transformers have higher inductance and reduce micro-fabrication complexity (Stojanovi c et al, 2008;Zhu et al, 2015) and fractal antennas have useful multiband frequency behavior (Puente-Baliarda et al, 1998). The implementation of an inductor using multiple layers increases the inductance and Q (Geen et al, 1989;Merrill et al, 1995;Zolfaghari et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

A novel hybrid series stacked differential fractal inductor for MMIC applications

Tumma

Nistala

2019

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Purpose The purpose of this paper is to design an on-chip inductor with high inductance, high-quality factor and high self-resonance frequency for the equivalent on-chip area using fractal curves. Design/methodology/approach A novel hybrid series stacked differential fractal inductor using Hilbert and Sierpinski fractal curves is proposed with two different layers connected in series using vias. The inductor is implemented in Sonnet EM simulator using 180 nm CMOS standard process technology. Findings The proposed inductor reduces the parasitic capacitance and negative mutual inductance between the adjacent layers with significant improvement in overall inductance, quality factor and self-resonance frequency when compared with conventional series stacked fractal inductors. Research limitations/implications The fractal inductor is used to create high inductance in the single-layer process, but access to multilayers is restricted owing to unusual and expensive fabrication processes. Practical implications The proposed inductor can be used in implementation of low noise amplifier, voltage controlled oscillators and power amplifiers. Originality/value This paper introduces a combination of two fractal curves to implement a hybrid fractal inductor that enhances the performance of the inductor.

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Investigation of space filling capacitors

Cited by 9 publications

References 6 publications

A moisture-enabled fully printable power source inspired by electric eels

A moisture-enabled fully printable power source inspired by electric eels

Híbrido rat-race miniaturizado para la banda ISM 2,4 GHZ

A novel hybrid series stacked differential fractal inductor for MMIC applications

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