2 W∕mm output power density at 1 GHz for diamond FETs

2005 ◽  
Vol 41 (22) ◽  
pp. 1249 ◽  
Author(s):  
M. Kasu ◽  
K. Ueda ◽  
H. Ye ◽  
Y. Yamauchi ◽  
S. Sasaki ◽  
...  
Keyword(s):  
Power Density ◽  
Output Power

scholarly journals Power Density Improvement of Piezoelectric Energy Harvesters via a Novel Hybridization Scheme with Electromagnetic Transduction

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 803
Author(s):  
Zhongjie Li ◽  
Chuanfu Xin ◽  
Yan Peng ◽  
Min Wang ◽  
Jun Luo ◽  
...  
Keyword(s):  
Power Density ◽  
Output Power ◽  
Energy Harvester ◽  
Hybrid Energy ◽  
Energy Harvesters ◽  
Piezoelectric Patch ◽  
Piezoelectric Energy ◽  
Electromagnetic Transduction ◽  
Self Powered ◽  
Power Densities

A novel hybridization scheme is proposed with electromagnetic transduction to improve the power density of piezoelectric energy harvester (PEH) in this paper. Based on the basic cantilever piezoelectric energy harvester (BC-PEH) composed of a mass block, a piezoelectric patch, and a cantilever beam, we replaced the mass block by a magnet array and added a coil array to form the hybrid energy harvester. To enhance the output power of the electromagnetic energy harvester (EMEH), we utilized an alternating magnet array. Then, to compare the power density of the hybrid harvester and BC-PEH, the experiments of output power were conducted. According to the experimental results, the power densities of the hybrid harvester and BC-PEH are, respectively, 3.53 mW/cm3 and 5.14 μW/cm3 under the conditions of 18.6 Hz and 0.3 g. Therefore, the power density of the hybrid harvester is 686 times as high as that of the BC-PEH, which verified the power density improvement of PEH via a hybridization scheme with EMEH. Additionally, the hybrid harvester exhibits better performance for charging capacitors, such as charging a 2.2 mF capacitor to 8 V within 17 s. It is of great significance to further develop self-powered devices.

A 4.69-W/mm output power density InAlN/GaN HEMT grown on sapphire substrate

2011 ◽  
Vol 32 (12) ◽  
pp. 124003 ◽  
Author(s):  
Bo Liu ◽  
Zhihong Feng ◽  
Sen Zhang ◽  
Shaobo Dun ◽  
Jiayun Yin ◽  
...  
Keyword(s):  
Power Density ◽  
Output Power ◽  
Sapphire Substrate ◽  
Gan Hemt

Thermoelectric module design to improve lifetime and output power density

2021 ◽  
Vol 18 ◽  
pp. 100391
Author(s):  
W. Sun ◽  
R. Sui ◽  
G. Yuan ◽  
H. Zheng ◽  
Z. Zeng ◽  
...  
Keyword(s):  
Power Density ◽  
Output Power ◽  
Thermoelectric Module ◽  
Module Design

Relation between piezoelectric properties of ceramics and output power density of energy harvester

2013 ◽  
Vol 33 (7) ◽  
pp. 1343-1347 ◽  
Author(s):  
Chang-Hoi Choi ◽  
In-Tae Seo ◽  
Daniel Song ◽  
Min-Soo Jang ◽  
Bo-Yun Kim ◽  
...  
Keyword(s):  
Power Density ◽  
Output Power ◽  
Energy Harvester ◽  
Piezoelectric Properties

scholarly journals Design of W-Band GaN-on-Silicon Power Amplifier Using Low Impedance Lines

2021 ◽  
Vol 11 (19) ◽  
pp. 9017
Author(s):  
Jinho Jeong ◽  
Yeongmin Jang ◽  
Jongyoun Kim ◽  
Sosu Kim ◽  
Wansik Kim
Keyword(s):  
Power Density ◽  
Output Power ◽  
Power Amplifier ◽  
High Power ◽  
Common Source ◽  
High Electron ◽  
Large Signal ◽  
Power Added Efficiency ◽  
W Band ◽  
Gan On Si

In this paper, a high-power amplifier integrated circuit (IC) in gallium-nitride (GaN) on silicon (Si) technology is presented at a W-band (75–110 GHz). In order to mitigate the losses caused by relatively high loss tangent of Si substrate compared to silicon carbide (SiC), low-impedance microstrip lines (20–30 Ω) are adopted in the impedance matching networks. They allow for the impedance transformation between 50 Ω and very low impedances of the wide-gate transistors used for high power generation. Each stage is matched to produce enough power to drive the next stage. A Lange coupler is employed to combine two three-stage common source amplifiers, providing high output power and good input/output return loss. The designed power amplifier IC was fabricated in the commercially available 60 nm GaN-on-Si high electron mobility transistor (HEMT) foundry. From on-wafer probe measurements, it exhibits the output power higher than 26.5 dBm and power added efficiency (PAE) higher than 8.5% from 88 to 93 GHz with a large-signal gain > 10.5 dB. Peak output power is measured to be 28.9 dBm with a PAE of 13.3% and a gain of 9.9 dB at 90 GHz, which corresponds to the power density of 1.94 W/mm. To the best of the authors’ knowledge, this result belongs to the highest output power and power density among the reported power amplifier ICs in GaN-on-Si HEMT technologies operating at the W-band.

scholarly journals Finite Time Thermodynamic Optimization of an Irreversible Proton Exchange Membrane Fuel Cell for Vehicle Use

Processes ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 419 ◽  
Author(s):  
Changjie Li ◽  
Ye Liu ◽  
Bing Xu ◽  
Zheshu Ma
Keyword(s):  
Power Density ◽  
Output Power ◽  
Proton Exchange Membrane ◽  
Operating Temperature ◽  
Maximum Output Power ◽  
Proton Exchange ◽  
Maximum Output ◽  
Operating Pressure ◽  
Output Efficiency ◽  
Exchange Membrane

A finite time thermodynamic model of an irreversible proton exchange membrane fuel cell (PEMFC) for vehicle use was established considering the effects of polarization losses and leakage current. Effects of operating parameters, including operating temperature, operating pressure, proton exchange membrane water content, and proton exchange membrane thickness, on the optimal performance of the irreversible PEMFC are numerically studied in detail. When the operating temperature of the PEMFC increases, the optimal performances of PEMFC including output power density, output efficiency, ecological objective function, and ecological coefficient of performance, will be improved. Among them, the optimal ecological objective function increased by 81%. The proton film thickness has little effect on the output efficiency and the ecological of coefficient performance. The maximum output power density increased by 58% as the water content of the proton exchange membrane increased from 50% to the saturation point. The maximum output power density increases with the operating pressure.

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