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European Conference on Microwave

作者： Sajjad Taravati Christophe Caloz Department of Electrical Engineering Poly technique de Montreal Montreal QC Canada Electrical and Computer Engineering Department King Abdulaziz University Jeddah Saudi Arabia

A nonuniform stub-loaded and coupling-free broadband phaser is proposed as an alternative to conventional coupled-line sections based phasers for enhanced design flexibility, reduced complexity and lower cost in Radio Analog Signal Processing (R-ASP) systems. Nonuniform open- and short-terminated stub-loaded sections are employed to achieve specified highly flexible group delays with flat transmission magnitude responses. The phaser does not require multilayer or wire-bonding technologies since it consists of coupling-free transmission lines. The principle and synthesis procedure of the phaser are presented and two design examples with diverse specifications are presented with theory and full-wave simulation results. The phaser can be realized using microstrip technology and integrate with different lumped components and planar structures.

关键词： Delays Bandwidth Transmission line matrix methods Dispersion distributed parameter circuits Impedance

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Transmission line model with frequency-dependent and nonuniform parameters in frequency and time domain

Transmission line model with frequency-dependent and nonunif...

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IEEE Workshop on Signal Propagation on Interconnects (SPI)

作者： Wojciech Bandurski Poznan University of Technology Poznan Poland

The paper presents a fast and effective method of modeling a nonuniform and dispersive interconnect by means of S-parameters. The paper presents an approach based on the method of successive approximations, but taking into account the dependence on the frequency of line parameters. The concept is to use a rational approximation of the per-unit-length parameter of the line calculated for each frequency. An example of the Bessel dispersive transmission line has been considered.

关键词： Approximation methods Power transmission lines Scattering parameters Dispersion Mathematical model distributed parameter circuits Frequency-domain analysis

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Crosstalk reduction using nonuniform transmission lines

Crosstalk reduction using nonuniform transmission lines

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International Conference on Software, Telecommunications and Computer Networks (SoftCOM)

作者： Mnaouer Kachout Jamel Bel Hadj Tahar Fethi Choubani Innov'COM Sup'Com Carthage University Tunis Tunisia

In this paper, a crosstalk reduction technique is proposed which utilizes nonuniform transmission lines. We investigate the effect of the nonuniform transmission line on the crosstalk reduction by simulation. We also present a comparison between coupled lines with uniform and nonuniform structures. Results show that using nonuniform guard line reduces crosstalk by more than 10db.

关键词： Crosstalk Couplings Conductors distributed parameter circuits Integrated circuit modeling Microstrip Electromagnetic scattering

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A problem-based introduction to microwave technology for undergraduates

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INTERNATIONAL JOURNAL OF ELECTRICAL ENGINEERING EDUCATION 2014年第4期51卷 383-394页

作者： Quan, Shaohui Beihang Univ BUAA Sch Elect & Informat Engn Electromagnet Engn Lab Beijing Peoples R China

In China, Microwave Technology is a specialised basic course for the undergraduate student whose major is electronics and information engineering. At Beihang University (BUAA) it is arranged in the first semester of the junior year (i.e. the third of a four-year course) and mainly includes transmission line theory, the theory of waveguides, microstrip transmission lines, the analysis of microwave networks and microwave passive components. In this paper, a problem-based introduction to microwave technology is presented, with the aim of increasing the students' interest and motivation to study this course. A pyramidal course structure for electrical engineering undergraduates in BUAA is then proposed, and the course orientation and outline of the Microwave Technology course incorporated within it. Questionnaire-based surveys demonstrate the positive effect of the course.

关键词： distributed parameter circuits microwave circuits microwave technology problem-based learning transmission lines waveguides

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Equivalent Circuit of Single-Core Cable Lines Suitable for Grounding Systems Analysis Under Line-to-Ground Faults

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IEEE TRANSACTIONS ON POWER DELIVERY 2014年第2期29卷 751-759页

作者： Todorovski, Mirko Ackovski, Risto Univ Ss Cyril & Methodius Fac Elect Engn & Informat Technol Skopje Macedonia

This paper presents two approaches where the single-core cable line and an additional conductor laid in parallel can be reduced to a simple equivalent pi-circuit containing an active element beside the usual passive impedances. The parameters of the equivalent circuit are calculated using a numerical approach where the distributed parameter line was discretized and an analytical approach is based on the wave propagation theory. A series of tests has been performed to determine error levels in both cases showing that they are less than 1%. With numerical examples, we show that the cable equivalent circuit offers a simple way to calculate voltages in complex grounding systems. The results are in good agreement with the previously published calculated and/or measured values. Both approaches offer the possibility of calculating voltage and current distribution along the cable line which gives insight into the significance of each cable component in the complex grounding system.

关键词： Cable sheaths distributed parameter circuits equivalent circuits fault currents grounding electrodes underground cable lines

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Novel Rectangular Waveguide Structures for Advanced Filter Characteristics

Novel Rectangular Waveguide Structures for Advanced Filter C...

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IEEE MTT-S International Microwave Symposium (IMS)

作者： Cogollos, S. Soto, P. Brumos, M. Boria, V. E. Guglielmi, M. Univ Politecn Valencia Inst Telecomunicac & Aplicac Multimedia E-46022 Valencia Spain European Space Agcy European Space Res & Technol Ctr NL-2200 AG Noordwijk Netherlands

ISBN: (纸本)9781479938698

This paper proposes novel waveguide topologies for obtaining filter responses with arbitrary placed transmission zeros (TZs). These new structures have a good electrical behavior and allow fast simulation using EM techniques. Several topologies and their corresponding electrical models will be presented, together with amenable synthesis and design procedures. The simplicity of the layout raises these kind of filters as good candidates for useful applications requiring advanced filter characteristics.

关键词： Microwave filters resonator filters distributed parameter circuits Design methodology equivalent circuits

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Design of Waveguide Manifold Multiplexers with Dual-Mode Filters U sing distributed Models

Design of Waveguide Manifold Multiplexers with Dual-Mode Fil...

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IEEE MTT-S International Microwave Symposium (IMS)

作者： Brumos, Maria Cogollos, Santiago Martinez, Monica Soto, Pablo Boria, Vicente E. Guglielmi, Marco Univ Politecn Valencia Inst Telecomunicac & Aplicac Multimedia E-46022 Valencia Spain Ferdinand Braun Inst Berlin Germany European Space Agcy European Space Res & Technol Ctr NL-2200 AG Noordwijk Netherlands

ISBN: (纸本)9781479938698

A novel multiplexer design technique which makes use of distributed models is proposed. For the first time, distributed models of dual mode filters are applied to the design of manifold multiplexers, with a large number of both contiguous or non-contiguous channels. After a brief review of the last advances in multiplexer design, the whole design process is described over a non-contiguous channel example. Finally, a contiguous channel case is presented.

关键词： Design methodology distributed parameter circuits equivalent circuits microwave filters multiplexing

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A meshless point interpolation method for time domain analysis of lossy nonuniform transmission lines

A meshless point interpolation method for time domain analys...

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International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)

作者： L. Benkhaoua M. T. Benhabiles M. L. Riabi Laboratoire Electromagnétisme et Télécommunications Université Constantine 1 Algeria

A Meshless Time Domain Method is proposed to solve the telegrapher's equation for the Nonuniform Transmission Line. The approach is based on a combination of the Point Interpolation Method PIM and the Leapfrog algorithm. The accuracy of the proposed method is confronted with both the conventional FDTD and a wavelet expansion method. The strong stability of the computing scheme is set in evidence from the computational results for a linear tapered planar line.

关键词： Interpolation Time-domain analysis distributed parameter circuits Finite difference methods Propagation losses Equations Mathematical model

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Nonuniform transmission line matching circuits synthesis - Analytical versus optimization approach

Nonuniform transmission line matching circuits synthesis - A...

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International Conference on Microwaves, Radar and Wireless Communications

作者： Przemysław Miazga Institute of Radio Electronics Warsaw University of Technology Warszawa Poland

This paper is dedicated to a direct synthesis of the wideband non-uniform transmission line matching circuits. A comparison of solutions, obtained using an analytical approach versus a numerical optimization method is presented. Practical conditions in microwave design, such as technological constraints and smoothness of the characteristic impedance function are considered. A new method for smoothing, based on constraint handling was implemented. Also sensitivity of the input reflection coefficient characteristic impedance is investigated.

关键词： Optimization Shape Reflection coefficient Admittance Microwave filters distributed parameter circuits Power transmission lines

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A nonuniform transmission line code for pulsed power Z-pinch drivers

A nonuniform transmission line code for pulsed power Z-pinch...

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IEEE Symposium Power Modulator

作者： Chongyang Mao Xiaobing Zou Xinxin Wang Department of Electrical Engineering Tsinghua University

A mathematical expression of the output voltage from a nonuniform line was deduced by investigating the transient response of a cascaded multiple-section line to an input voltage of half-sine shape that is close to the wave shape of the pulse voltage for Z-pinch. The correctness of the mathematical expression was verified by comparing the result from the mathematical expression with that from circuit simulation using PSpice code. Based on this mathematical expression, a code was wrote using MATLAB to calculate the output voltage from a nonuniform line. To make our code friendly to users, a graphical user interface was designed using MATLAB.

关键词： Reflection Impedance Mathematical model Shape SPICE distributed parameter circuits MATLAB

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