high capacitance
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Author(s):  
Najmeddine Ferhi ◽  
Birhanu Desalegn Assresahegn ◽  
Carolina Ardila-Suarez ◽  
Nour Dissem ◽  
Daniel Guay ◽  
...  

2022 ◽  
Author(s):  
Shaoqiu Ke ◽  
Di Xie ◽  
Kai Zhang ◽  
Fangchao Cheng ◽  
Yiqiang Wu

Herein, we demonstrate a structure-enabled strategy to construct an ultrastable, high-performance, ultraflexible all-in-one supercapacitor with a one-piece wood cellulose network/polyaniline/multiwalled carbon nanotube composite as both the electrodes and the separator....


Micromachines ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 37
Author(s):  
Kun Deng ◽  
Fuxing Yang ◽  
Yucheng Wang ◽  
Chengqi Lai ◽  
Ke Han

In this paper a high capacitance ratio and low actuation voltage RF MEMS switch is designed and fabricated for Ka band RF front-ends application. The metal-insulator-metal (MIM) capacitors is employed on a signal line to improve the capacitance ratio, which will not degrade the switch reliability. To reduce the actuation voltage, a low spring constant bending folding beam and bilateral drop-down electrodes are designed in the MEMS switch. The paper analyzes the switch pull-in model and deduces the elastic coefficient calculation equation, which is consistent with the simulation results. The measured results indicated that, for the proposed MEMS switch with a gap of 2 μm, the insertion loss is better than −0.5 dB and the isolation is more than −20 dB from 25 to 35 GHz with an actuation voltage of 15.8 V. From the fitted results, the up-state capacitance is 6.5 fF, down-state capacitance is 4.3 pF, and capacitance ratios is 162. Compared with traditional MEMS capacitive switches with dielectric material Si3N4, the proposed MEMS switch exhibits high on/off capacitance ratios of 162 and low actuation voltage.


2021 ◽  
Vol 39 ◽  
pp. 114-119
Author(s):  
Jun Wang ◽  
Zhuwen Ma ◽  
Bixia Jiang ◽  
Qinghua Yuan ◽  
Lin Cao ◽  
...  

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