Demonstration of Constant 8 W/mm Power Density at 10, 30, and 94 GHz in State-of-the-Art Millimeter-Wave N-Polar GaN MISHEMTs

2018 ◽  
Vol 65 (1) ◽  
pp. 45-50 ◽  
Author(s):  
Brian Romanczyk ◽  
Steven Wienecke ◽  
Matthew Guidry ◽  
Haoran Li ◽  
Elaheh Ahmadi ◽  
...  
Keyword(s):  
Power Density ◽  
Millimeter Wave ◽  
State Of The Art

Multicriteria Assessment of the Performance of Solid Oxide Fuel Cells by Cell Design and Materials Development: Design and Modeling Approach

2013 ◽  
Vol 10 (1) ◽  
Author(s):  
Junichiro Otomo ◽  
Keiko Waki ◽  
Koichi Yamada
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Power Density ◽  
State Of The Art ◽  
Solid Oxide ◽  
Cell Performance ◽  
Cell Design ◽  
Oxide Fuel ◽  
Volume Weight ◽  
Material Cost

The performance of current solid oxide fuel cells (SOFCs) was evaluated in terms of the cell designs and the physicochemical properties of the component materials such as the electrode and electrolyte in order to demonstrate the potentials of state-of-the-art SOFC technology for the widespread use of SOFCs. A flat tubular type SOFC stack for residential use was analyzed as a standard case of a production version in terms of stack volume, weight, and material cost. The power density and power generation efficiency were also evaluated by model estimation. A microtubular type SOFC was evaluated as an example of an advanced cell design. The assessment of the cell design can pinpoint performance advantages of the microtubular type in stack volume, weight, material cost, volumetric power density, and efficiency. In addition, we attempted to demonstrate an analysis for the concurrent comparison of the impact of cell designs and material properties on cell performance by using volumetric power density as a common assessment criterion. Through the assessment with the state-of-the-art SOFC technology, it is possible to make a quantitative comparison of the significances of cell design and material property. The present assessment suggests that the development of cell design is a consistent approach to improving cell and stack performance. In this way, the proposed assessment can provide hints to a reliable research strategy for improving cell performance and realizing the widespread use of SOFCs.

Millimeter wave power density in aqueous biological samples

2001 ◽  
Vol 22 (4) ◽  
pp. 288-291 ◽  
Author(s):  
S.I. Alekseev ◽  
M.C. Ziskin
Keyword(s):  
Power Density ◽  
Millimeter Wave ◽  
Biological Samples ◽  
Wave Power ◽  
Wave Power Density

scholarly journals Forward Transformation from Reactive Near-Field to Near and Far-Field at Millimeter-Wave Frequencies

2020 ◽  
Vol 10 (14) ◽  
pp. 4780
Author(s):  
Serge Pfeifer ◽  
Arya Fallahi ◽  
Jingtian Xi ◽  
Esra Neufeld ◽  
Niels Kuster
Keyword(s):  
Electric Field ◽  
Power Density ◽  
Millimeter Wave ◽  
Mobile Communications ◽  
Average Power ◽  
Spatial Average ◽  
Far Field ◽  
Phase Reconstruction ◽  
Noise Levels ◽  
Wide Range

With the advent of 5G mobile communications at millimeter-wave frequencies, the assessment of the maximum averaged power density on numerous surfaces close to the transmitter will become a requirement. This makes phasor knowledge about the electric and magnetic fields an inevitable requirement. To avoid the burdensome measurement of these field quantities in the entire volume of interest, phase reconstruction algorithms from measurements over a plane in the far-field region are being extensively developed. In this paper, we extended the previously developed method of phase reconstruction to evaluate the near and far-field of sources with bounded uncertainty, which is robust with respect to noisy data and optimized for a minimal number of measurement points at a distance as close as λ /5 from the source. The proposed procedure takes advantage of field integral equations and electric field measurements with the EUmmWVx probe to evaluate the field phasors close to the radiation source and subsequently obtain the field values in the whole region of interest with minimal computation and measurement costs. The main constraints are the maximal noise level regarding the peak electric field and measurement plane size with respect to the percentage of transmitted power content. The measurement of a third plane overcomes some of the noise issues. The method was evaluated by simulations of a wide range of antennas at different noise levels and at different distances and by measurements of four different antennas. A successful reconstruction in the near and far-field was achieved both qualitatively and quantitatively for distances between 2.5–150 mm from the antenna and noise levels of −24 dB from the peak. The deviation of reconstruction from the simulation reference for the peak spatial-average power density with an averaging area of 1 cm 2 was, in all cases, well within the uncertainty budget of 0.6 dB, if the reconstruction planes captured >95% of the total radiated power. The proposed new method is very promising for compliance assessment and can reduce test time considerably.

High-voltage Millimeter-Wave GaN HEMTs with 13.7 W/mm Power Density

2007 ◽  
Author(s):  
Y.-F. Wu ◽  
M. Moore ◽  
A. Abrahamsen ◽  
M. Jacob-Mitos ◽  
P. Parikh ◽  
...  
Keyword(s):  
Power Density ◽  
Millimeter Wave ◽  
High Voltage ◽  
Gan Hemts
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