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A monolithic distributed phase shifter based on right-handed nonlinear transmission lines at 30 GHz 被引量:1
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作者 黄杰 赵倩 +2 位作者 杨浩 董军荣 张海英 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第12期451-455,共5页
The epitaxial material, device structure, and corresponding equivalent large signal circuit model of GaAs planar Schottky varactor diode are successfully developed to design and fabricate a monolithic phase shifter, w... The epitaxial material, device structure, and corresponding equivalent large signal circuit model of GaAs planar Schottky varactor diode are successfully developed to design and fabricate a monolithic phase shifter, which is based on right-handed nonlinear transmission lines and consists of a coplanar waveguide transmission line and periodically distributed GaAs planar Schottky varactor diode. The distributed-Schottky transmission-line-type phase shifter at a bias voltage greater than 1.5 V presents a continuous 0°–360° differential phase shift over a frequency range from 0 to 33 GHz. It is demonstrated that the minimum insertion loss is about 0.5 dB and that the return loss is less than-10 dB over the frequency band of 0–33 GHz at a reverse bias voltage less than 4.5 V. These excellent characteristics, such as broad differential phase shift, low insertion loss, and return loss, indicate that the proposed phase shifter can entirely be integrated into a phased array radar circuit. 展开更多
关键词 GaAs planar Schottky diode phase shifter right-handed nonlinear transmission lines monolithic microwave integrated circuit
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Broadband microwave frequency doubler based on left-handed nonlinear transmission lines
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作者 黄杰 顾雯雯 赵倩 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第3期500-505,共6页
A bandwidth microwave second harmonic generator is successfully designed using composite right/left-handed non- linear transmission lines (CRLH NLTLs) in a GaAs monolithic microwave integrated circuit (MMIC) techn... A bandwidth microwave second harmonic generator is successfully designed using composite right/left-handed non- linear transmission lines (CRLH NLTLs) in a GaAs monolithic microwave integrated circuit (MMIC) technology. The structure parameters of CRLH NLTLs, e.g. host transmission line, rectangular spiral inductor, and nonlinear capacitor, have a great impact on the second harmonic performance enhancement in terms of second harmonic frequency, output power, and conversion efficiency. It has been experimentally demonstrated that the second harmonic frequency is deter- mined by the anomalous dispersion of CRLH NLTLs and can be significantly improved by effectively adjusting these structure parameters. A good agreement between the measured and simulated second harmonic performances of Ka-band CRLH NLTLs frequency multipliers is successfully achieved, which further validates the design approach of frequency multipliers on CRLH NLTLs and indicates the potentials of CRLH NLTLs in terms of the generation of microwave and millimeter-wave signal source. 展开更多
关键词 GaAs planar Schottky diode frequency multiplier composite fight/left-handed transmission line monolithic microwave integrated circuit
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The Integrated System of Aerial Photogrammetry and Tower Locations Optimization for Transmission Lines
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作者 Xie Yuan, Pan Yijun, Fu Bin Northwest Power Design Institute 《Electricity》 1996年第4期45-48,共4页
This paper describes the functions and the features of the integrated system of aerial survey and tower locations optimization for transmission lines, which includes all stages from data acquisition, data transmission... This paper describes the functions and the features of the integrated system of aerial survey and tower locations optimization for transmission lines, which includes all stages from data acquisition, data transmission and data processing to automatic optimization of the tower locations and drawing. The paper also briefly describes the economic benefit gained from this system, and finally proposes the directions of the future development for this system. 展开更多
关键词 PRO The Integrated System of Aerial Photogrammetry and Tower Locations Optimization for transmission Lines
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A Least-squares-based Iterative Method with Better Convergence for PF/OPF in Integrated Transmission and Distribution Networks
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作者 Kunjie Tang Shufeng Dong Yonghua Song 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2024年第3期953-962,共10页
The limitations of the conventional master-slavesplitting(MSS)method,which is commonly applied to power flow and optimal power flow in integrated transmission and distribution(I-T&D)networks,are first analyzed.Con... The limitations of the conventional master-slavesplitting(MSS)method,which is commonly applied to power flow and optimal power flow in integrated transmission and distribution(I-T&D)networks,are first analyzed.Considering that the MSS method suffers from a slow convergence rate or even divergence under some circumstances,a least-squares-based iterative(LSI)method is proposed.Compared with the MSS method,the LSI method modifies the iterative variables in each iteration by solving a least-squares problem with the information in previous iterations.A practical implementation and a parameter tuning strategy for the LSI method are discussed.Furthermore,a LSI-PF method is proposed to solve I-T&D power flow and a LSIheterogeneous decomposition(LSI-HGD)method is proposed to solve optimal power flow.Numerical experiments demonstrate that the proposed LSI-PF and LSI-HGD methods can achieve the same accuracy as the benchmark methods.Meanwhile,these LSI methods,with appropriate settings,significantly enhance the convergence and efficiency of conventional methods.Also,in some cases,where conventional methods diverge,these LSI methods can still converge. 展开更多
关键词 Fixed-point theory integrated transmission and distribution networks least-squares-based iterative method master-slave-splitting method optimal power flow power flow
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THROTTLE CONTROL STRATEGIES IN THE PROCESS OF INTEGRATED POWERTRAIN CONTROL 被引量:6
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作者 Lei Yulong Gao Bingzhao +2 位作者 Tian Hua Ge Anlin Yan Su 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2005年第3期429-433,共5页
Combining with the development of automated manual transmission (AMT), the various throttle control demands are analyzed under different working conditions of AMT such as tracking acceleration pedal, start, shift an... Combining with the development of automated manual transmission (AMT), the various throttle control demands are analyzed under different working conditions of AMT such as tracking acceleration pedal, start, shift and so on. Based on simulation, the responding throttle control strategies are proposed, and a simple but effective throttle control method is presented. The testing results have proved that the strategies are effective for improving the pedal tracking precision and the qualities of start and shift. 展开更多
关键词 Electronic throttle control Automated manual transmission Integrated powertrain control
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Polarization multiplexing QPSK signal transmission in optical wireless-over f iber integration system at W-band 被引量:2
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作者 肖江南 汤婵娟 +4 位作者 李欣颖 余建军 黄星星 杨超 迟楠 《Chinese Optics Letters》 SCIE EI CAS CSCD 2014年第5期11-14,共4页
We propose and experimentally demonstrate a novel scheme to realize polarization-division-multiplexing quadrature-phase-shift-keying (PDM-QPSK) signal transmission over fiber, wireless and fiber at Wband (75-110 GH... We propose and experimentally demonstrate a novel scheme to realize polarization-division-multiplexing quadrature-phase-shift-keying (PDM-QPSK) signal transmission over fiber, wireless and fiber at Wband (75-110 GHz). The generation of polarization multiplexing millimeter-wave (mm-wave) wireless signal is based on the photonic technique. After 20-km fiber transmission, polarization diversity and heterodyne beating are implemented to convert the polarization components of the polarization-multiplexing signals from the optical baseband to W-band so that up to 16 Gb/s mm-wave signals can be delivered over 2-m 2~2 multiple-input multiple-output (MIMO) wireless link. At the receiver base station (BS), polarization combination reconstructs the PDM-QPSK signal which is then launched into another 20-km fiber. In the experiment, coherent detection is introduced to improve receiver sensitivity and constant modulus algorithm (CMA) is applied for polarization de-multiplexing. The bit-error-ratio (BER) for 16-Gb/s PDM- QPSK signal delivery is below the forward-error-correction (FEC) threshold of 3.8× 10-3 with the optical signal-to-noise ratio (OSNR) above 11.8 dB. 展开更多
关键词 QPSK OVER Polarization multiplexing QPSK signal transmission in optical wireless-over f iber integration system at W-band PDM OSNR
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Operational Risk Assessment for Integrated Transmission and Distribution Networks 被引量:3
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作者 Kunjie Tang Shufeng Dong +1 位作者 Jian Huang Xiang Ma 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2023年第6期2109-2120,共12页
To satisfy the requirements of accurate operationalrisk assessment of integrated transmission and distribution networks (I-T&D), an integrated operational risk assessment (IORA) algorithm is proposed. Specific cas... To satisfy the requirements of accurate operationalrisk assessment of integrated transmission and distribution networks (I-T&D), an integrated operational risk assessment (IORA) algorithm is proposed. Specific cases demonstrate thatan I-ORA is necessary because it provides accurate handlingof the coupling between transmission and distribution networks,accurate analysis of power supply mode (PSM) changes ofimportant users and helps to improve security and stability ofpower grid operations. Two key technical requirements in theI-ORA algorithm are realized, i.e., integrated topology analysisand integrated power flow calculation. Under a certain contingency, integrated topology analysis is used to assess the risksof substation power cuts, network split and PSM changes ofimportant users, while the integrated power flow calculation,based on the self-adaptive Levenburg-Marquard method andNewton method, can be implemented to assess risks of heavyload/overload and voltage deviation. In addition, the graphicsprocessing unit is used to parallelly process some computationintensive steps. Numerical experiments show that the proposedI-ORA algorithm can realize accurate assessment for the entireI-T&D. In addition, the efficiency and convergence are satisfying,indicating the proposed I-ORA algorithm can significantly benefitreal practice in the coordination operation of I-T&D in the future. 展开更多
关键词 Global model integrated transmission and distribution networks operational risk assessment power flow calculation topology analysis
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Distributed continuation power flow method for integrated transmission and active distribution network 被引量:7
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作者 Jinquan ZHAO Xiaolong FAN +1 位作者 Changnian LIN Wenhui WEI 《Journal of Modern Power Systems and Clean Energy》 SCIE EI 2015年第4期573-582,共10页
As the integration of distributed generations(DGs)transforms the traditional distribution network into the active distribution network,voltage stability assessments(VSA)of transmission grid and distribution grid are n... As the integration of distributed generations(DGs)transforms the traditional distribution network into the active distribution network,voltage stability assessments(VSA)of transmission grid and distribution grid are not suitable to be studied separately.This paper presents a distributed continuation power flow method for VSA of global transmission and distribution grid.Two different parameterization schemes are adopted to guarantee the coherence of load growth in transmission and distribution grids.In the correction step,the boundary bus voltage,load parameter and equivalent power are communicated between the transmission and distribution control centers to realize the distributed computation of load margin.The optimal multiplier technique is used to improve the convergence of the proposed method.The three-phase unbalanced characteristic of distribution networks and the reactive capability limits of DGs are considered.Simulation results on two integrated transmission and distribution test systems show that the proposed method is effective. 展开更多
关键词 Integrated transmission and distribution grid Distributed computation Voltage stability Continuation power flow Three-phase distribution network Distribution generation
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CMOS implementation of a low-power BPSK demodulator for wireless implantable neural command transmission
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作者 吴朝晖 张旭 +1 位作者 梁志明 李斌 《Journal of Semiconductors》 EI CAS CSCD 2012年第5期113-119,共7页
A new BPSK demodulator was presented.By using a clock multiplier with very simple circuit structure to replace the analog multiplier in the traditional BPSK demodulator,the circuit structure of the demodulator became ... A new BPSK demodulator was presented.By using a clock multiplier with very simple circuit structure to replace the analog multiplier in the traditional BPSK demodulator,the circuit structure of the demodulator became simpler and hence its power consumption became lower.Simpler structure and lower power will make the designed demodulator more suitable for use in an internal single chip design for a wireless implantable neural recording system.The proposed BPSK demodulator was implemented by Global Foundries 0.35μm CMOS technology with a 3.3 V power supply.The designed chip area is only 0.07 mm;and the power consumption is 0.5 mW.The test results show that it can work correctly. 展开更多
关键词 CMOS integrated circuits low-power BPSK demodulator implantable biomedical devices wireless command transmission
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