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Investigation of MXene nanosheets based radio-frequency electronics by skin depth effect

Nano Research 2024年第4期17卷 3061-3067页

作者： Rongguo Song Yunfa Si Wei Qian Haoran Zu Bilei Zhou Qinglei Du Daping He Yongliang Wang Air Force Early Warning Academy Wuhan 430019China Hubei Engineering Research Center of RF-Microwave Technology and Application Wuhan University of TechnologyWuhan 430070China Hainan Research Institute Wuhan University of TechnologySanya 572000China

Various new conductive materials with exceptional properties are utilized for the preparation of electronic *** ultra-high conductivity is crucial to attain excellent electrical ***,there is a lack of systematic research on the impact of conductor material thickness on device ***,we investigate the effect of conductor thickness on power transmission and radiation in radio-frequency(RF)and microwave electronics based on MXene nanosheets material transmission lines and *** MXene transmission line with thickness above the skin depth exhibits a good transmission coefficient of approximately-3 dB,and the realized gain of MXene antennas exceeds 2 ***,the signal transmission strength of MXene antenna with thickness above the skin depth is higher than 5-μm MXene antenna approximately 5.5 *** lines and antennas made from MXene materials with thickness above the skin depth exhibit stable and reliable performance,which has significant implications for obtaining high-performance RF and microwave electronics based on new conductive materials.

关键词： MXene film radiao-frequency electronics antenna transmission line skin depth

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Enhancement of GMI Effect in Silicon Steels by Furnace Annealing

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Journal of Materials Science & Technology 2009年第5期25卷 619-621页

作者： C.Sirisathitkul P.Jantaratana Magnet Laboratory Molecular Technology Research UnitSchool of ScienceWalailak UniversityNakon Si Tham-marat 80161Thailand Electricity and Magnetism Properties Research Laboratory Department of PhysicsFaculty of ScienceKasetsart UniversityBangkok 10900Thailand

The ratio and sensitivity of giant magnetoimpedance （GMI） in grain oriented silicon steels （Fe-4.5%Si） are improved after furnace annealing in air for 20 min. By annealing at 800℃, the GMI sensitivity rises from 1.29%/Oe to 1.91%/Oe and the ratio increases from 237% to 294% with decreasing characteristic frequency. The results are attributable to an increase in the transverse magnetic permeability during the heat treatment. From simulation by finite element method, the GMI effect can be interpreted as the modification of the current distribution by the applied magnetic field via the transverse permeability. In the case of annealed samples,the larger transverse permeability allows a higher GMI ratio and sensitivity.

关键词： Silicon steels Giant magnetoimpedance Furnace annealing skin depth Transverse permeability

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Analysis of Strip Temperature in Hot Rolling Process by Finite Element Method

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Journal of Iron and Steel Research International 2010年第2期17卷 17-21页

作者： MEI Rui-bin LI Chang-sheng LIU Xiang hua HAN Bin State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Technical Center Wuhan Iron and Steel Group Co Wuhan 430080 Hubei China

The program was developed by finite element method to calculate the temperature distribution in hot strip rolling process. The heat transfer coefficients of air cooling, water cooling and thermal resistance between work roll and strip were analyzed, A new heat generation rate model was proposed according to the influence of source current density, work frequency, air gap and distance to edge on induction heating by finite element method （FEM）. The heat generation rate was considered in the thermal analysis to predict the temperature distribution in the induction heating. The influence of induction heating on the strip temperature was investigated for different slab thicknesses. The temperature difference became more and more obvious with the increase of thickness. The strip could be heated quickly by the induction heating both in surface and center because of the thermal conductivity and skin effect. The heat loss of radiation has important influence on the surface temperature. The surface temperature could be heated quickly by high frequency when the strip is thicker.

关键词： temperature distribution finite element method induction heating skin depth hot rolling

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Large area planar plasma sustained by surface microwave

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Chinese Physics B 2007年第12期16卷 3732-3737页

作者：梁波欧琼荣梁以资梁荣庆 The Key Laboratory of Applied Ion Beam Physics the Ministry of Education Shanghai 200433 China Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China

In this paper, we show theoretically and experimentally that the large-area planar plasma with high density and good uniformity can be sustained by a surface microwave when the electron density is over-dense. From the experimental results we find that the nonuniformities in azimuthal plasma density and electron temperature have been greatly improved and in particular the nonuniformity is less than 10% when the gas pressure is 30 Pa. By improving the antenna shape, enhancing the microwave power and choosing the appropriate gas pressure, the large area planar plasma with high density can be produced.

关键词： microwave skin depth surface wave surface wave plasma

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Initial transient process in a simple helical flux compression generator

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Chinese Physics B 2006年第7期15卷 1539-1543页

作者：杨显俊 Institute of Applied Physics & Computational Mathematics Beijing 100088 China

An analytical scheme on the initial transient process in a simple helical flux compression generator, which includes the distributions of both the magnetic field in the hollow of an armature and the conducting current density in the stator, is developed by means of a diffusion equation. A relationship between frequency of the conducting current, root of the characteristic function of Bessel equation and decay time in the armature is given. The skin depth in the helical stator is calculated and is compared with the approximate one which is widely used in the calculation of magnetic diffusion. Our analytical results are helpful to understanding the mechanism of the loss of magnetic flux in both the armature and stator and to suggesting an optimal design for improving performance of the helical flux compression generator.

关键词： initial transient process helical flux compression generator diffusion equation skin depth

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Optimizing resistance of round hollow wire at high frequency

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微纳电子技术 2003年第Z1期 415-418页

作者： FENG Yong jian 1,ZHANG Tao 2 (1. Micro Electronic Mechanical Center, Xiamen University, Xiamen 361005,China 2. Department of Electrical Engineering Computer Science, Case Western Reserve University,Cleveland,OH 44106,USA)

The results and methods of calculation of resistance of hollow wire in gigahertz range by Bessel function are given. According to the results of computation, it is found that the resistor of conductor can be optimized using hollow wire with specific wall thickness. At high frequency the current distribution across a circular hollow wire is at surface of wire, which is called skin depth. We found that optimum wall thickness is proportional to skin depth and the phase abrupt change point of H field. Theoretical analysis and mechanism optimized round hollow wire will be presented in this paper. The calculation indicates that cylindrical hollow wire can be optimized to decrease resistance above 8%.

关键词： resistance hollow wire Bessel function skin depth

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