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Incorporating Temperature Variations Into Transmission-Line Models

IEEE TRANSACTIONS ON POWER DELIVERY 2011年第4期26卷 2189-2196页

作者： Cecchi, Valentina St Leger, Aaron Miu, Karen Nwankpa, Chika O. Univ N Carolina Dept Elect & Comp Engn Charlotte NC 28203 USA US Mil Acad Dept Elect Engn & Comp Sci West Point NY 10566 USA Drexel Univ Ctr Elect Power Engn Philadelphia PA 19104 USA

This paper discusses a transmission-line modeling approach that incorporates available ambient temperature information. Several proposed line modeling techniques are studied and include distributed and lumped parameter models. In order to capture the nonuniformity of line parameters caused by temperature gradients, a model with multiple nonuniform segments is also proposed. An automated tool has been developed to obtain appropriate line model segmentation and parameter values of each segment, given a set of temperature measurements and their locations along the line.

关键词： Ambient temperature distributed parameter circuits nonuniform transmission lines power system modeling power transmission lines

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Rotary Traveling-Wave Oscillators, Analysis and Simulation

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IEEE TRANSACTIONS ON circuits AND SYSTEMS I-REGULAR PAPERS 2011年第1期58卷 77-87页

作者： Chen, Yulin Pedrotti, Kenneth D. Univ Calif Santa Cruz Dept Elect Engn Sch Engn Santa Cruz CA 95064 USA

Rotary traveling-wave oscillators (RTWOs) are a new transmission-line based approach to gigahertz rate oscillators. This paper presents the fundamental theory of RTWOs in both the weakly nonlinear and strongly nonlinear regions of operation, including their multimode characteristics, quality factor, nonlinearity, and edge rate of the oscillating waveform. Finally we use the theory to derive analytic expressions for thermally induced phase noise. Our theoretical results are then compared with accurate simulations.

关键词： CMOS integrated circuits distributed parameter circuits oscillators phase noise

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On Inductance of Buried Horizontal Bare Conductors

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IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY 2011年第4期53卷 1083-1087页

作者： Grcev, L. Markovski, B. Grceva, S. Macedonian Acad Sci & Arts Skopje 1000 Macedonia Ss Cyril & Methodius Univ Fac Elect Engn & Informat Technol Skopje 1000 Macedonia FON Univ Fac Informat & Commun Technol Skopje 1000 Macedonia

External inductance is one of the basic quantities in the classical approach to the surge and high-frequency analysis of buried horizontal bare conductors. However, there is no consensus, in the modern literature, on the treatment of the effects of the earth surface in the approximate expressions for the inductance, and several different formulas are often used. In this paper, we derive a new expression for the external inductance of buried horizontal conductors that accurately takes into account the effects of the earth surface and compare the errors of the usual approximate formulas. We also propose new approximate formulas that lead to smaller errors for depths of burial less than or equal to 1 m.

关键词： Circuit modeling distributed parameter circuits grounding electrodes lightning transmission line modeling

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Determination of the stray capacitance of single layer solenoids

Determination of the stray capacitance of single layer solen...

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IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

作者： Mariscotti, A. Univ Genoa DINAEL Dept Naval & Elect Eng Via Opera Pia 11A I-16145 Genoa Italy

ISBN: (纸本)9781424479351

Windings featuring low stray capacitance are usually single layer solenoids with significant turn-to-turn spacing. The accurate stray capacitance estimation is important both during design and to validate measurement results. There exist a few contradictory expressions and results published in the last seventy years;to this aim a new formulation is proposed together with a measurement technique other than the use of LCR bridges and with a reduced uncertainty.

关键词： Capacitance measurement distributed parameter circuits Solenoids

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Scalable distributed Small-Signal Millimeter-wave HEMT Model

Scalable Distributed Small-Signal Millimeter-wave HEMT Model

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6th European Microwave Integrated Circuit Conference (EuMIC)

作者： Hoque, M. E. Parker, Anthony E. Heimlich, Michael Tarazi, Jabra Mahon, Simon Macquarie Univ Dept Elect Engn Sydney NSW 2109 Australia Macom Technol Solut Sydney NSW Australia

ISBN: (纸本)9782874870231

A HEMT model is proposed that correctly isolates the access metallization from the intrinsic device to give linear scalability. The model uses a distributed network of intrinsic unit cells composed of lumped elements. The topology of these networks is determined such that a scalable set of parameters is obtained. The parameters for the intrinsic and extrinsic parts of the transistor have been extracted for a GaAs pHEMT and the correct topology derived such that simple scaling rules apply to the unit cell.

关键词： distributed parameter circuits electromagnetic analysis HEMTs parameter extraction semiconductor device modeling

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distributed parameter circuit model for transmission line

Distributed parameter circuit model for transmission line

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International Conference on Advanced Power System Automation and Protection (APAP)

作者： Jian Luo Kaidi Zhang Tao Chen Guofu Zhao Peng Wang Shuhui Feng State Key Laboratory of Power Transmission Equipments & System Security and New Technology Chongqing University Chongqing China Chongqing electric power research Institute Chongqing China Chongqing electric power research institute chongqing

The constructing accuracy of the parameter model for uniform transmission line is not ideal currently. In order to improve the constructing accuracy of the parameter model for transmission line, a new distributed parameter circuit model is built. In this paper, the constructing principle and method of the new distributed parameter circuit model are explained and the transmission time and constructing accuracy are discussed. Besides, some simulation experiments have been done and some simulation analyses have been performed which prove that the new distributed parameter circuit model is excellent in improving the constructing accuracy.

关键词： Integrated circuit modeling Power transmission lines Accuracy distributed parameter circuits Analytical models Mathematical model Propagation losses

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A Planar Band-Rejected UWB Antenna with Nonuniform Transmission Line Filter Based on Inverse Scattering Theory

A Planar Band-Rejected UWB Antenna with Nonuniform Transmiss...

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2011 IEEE International Symposium on Antennas and Propagation(APSURSI 2011)

作者： Ryouhei Hosono Ning Guan Ken'ichiro Yashiro Optics and Electronics Laboratory Fujikura Ltd. 1440 Mutsuzaki Sakura 285-8550 Japan Faculty of Engineering Chiba University 1-33 Yayoi-cho Inage-ku Chiba 263-8522 Japan

ISBN: (纸本)9781424495627;9781424495634

In this paper, a planar ultra-wideband (UWB) antenna with rejected band is presented. The antenna is composed of a wideband radiation element and a band-rejected filter realized by nonuniform transmission line (NTL). The geometry of the NTL filter is designed by solving Zakharov-Shabat inverse scattering problem. Firstly, the antenna and filter are fabricated separately and their characteristics are measured. Then they are combined and evaluated too. It is demonstrated that the measurement agrees with the calculation well and the desired characteristics are obtained.

关键词： component: band-rejected UWB planar antenna nonuniform transmission line filter inverse scattering problem Ultra wideband antennas distributed parameter circuits Filters inverse scattering Planar

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A method for suppressing steady-state operating overvoltages of the half wave-length UHV AC power transmission line

A method for suppressing steady-state operating overvoltages...

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Asia-Pacific International Conference on Lightning (APL)

作者： Ling-tao Wang Xiang Cui College of Engineering Shanxi University Taiyuan Shanxi China Key Laboratory of High Voltage and EMC Beijing North China Electic Power University Beijing China

This paper presents a method for suppressing steady-state operating overvoltages at the middle portion of the half wave-length transmission lines based on an unconventional AC transmission system that the half wave-length transmission line is divided into five segments with the different phase spacing and the different split distance. Then an analysis is made of the steady-state operation of a 1000kV-50Hz-3000km transmission system with uniform and nonuniform transmission lines. Simulation results showed that the steady-state operating overvoltages at the middle portion of the power transmission lines can be efficiently suppressed. This method is very convenient to be applied in countries where the transmission lines sites are very distant from the consumption regions.

关键词： Power transmission lines Steady-state Surges Reactive power Conductors distributed parameter circuits

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Theoretical approach to study crosstalk between three conductor nonuniform transmission lines

Theoretical approach to study crosstalk between three conduc...

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Mediterrannean Microwave Symposium (MMS)

作者： Mnaouer Kachout Jamel Bel Hadj Tahar Fethi Choubani Research Unit Systems of Telecommunications (6'Tel) SUP'COM Carthage University Ariana Tunisia

In this paper Theoretical approach to study crosstalk between three conductor transmission lines is developed. Methods for prediction of crosstalk between microstrip transmission lines are reviewed. Equations are derived which can be solved to obtain formulas for the near-end and far-end crosstalk for nonuniform transmission lines.

关键词： Crosstalk Conductors Equations distributed parameter circuits Transmission line matrix methods Power transmission lines Microstrip

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The comparison and analysis of lumped parameter equivalent circuits of transmission line

The comparison and analysis of lumped parameter equivalent c...

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International Conference on Advanced Power System Automation and Protection (APAP)

作者： ShiCong Ma JianBo Guo HuaDong Sun YongJin Yu China Electric Power Research Institute Beijing China Shandong University of Science and Technology Tsingtao China

Based on the frequency characteristics analysis, the feature and scope of lumped parameters circuits are presented in this paper, which can be as the reference of equivalent circuit selection. Firstly the Γ section equivacircuit was introduced as the equivalent of transmission line and its validity was proved. The frequency characteristics of lumped parameters circuits are analyzed and compared with the distributed parameters circuit. From characteristic analysis, the effective frequency band that the lumped parameters circuit can be taken as the equivalent of transmission line was obtained. Considering effective frequency band and model complexity, the selection principle for application is proposed. The research results showed that Γ section has the best approximation and Γ section has the simplest model equation. The proper selection of equivalent circuit can significantly increase the convenience and effectiveness for power system calculation.

关键词： Integrated circuit modeling Power transmission lines Equivalent circuits Mathematical model distributed parameter circuits Transmission line matrix methods

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