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A problem-based introduction to microwave technology for undergraduates

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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CYLINDRICAL SUBSTRATE MICROSTRIP LINE CHARACTERIZATION

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1987年第9期35卷 843-849页

作者： ALEXOPOULOS, NG NAKATANI, A UNIV CALIF LOS ANGELES SCH ENGN & APPL SCILOS ANGELESCA 90024 NORTHROP CORP DIV ADV SYSTHAWTHORNECA 90250

In this article, quasi-static and dynamic solutions are derived for microstrip transmission lines on circularly symmetric cylindrical substrates. Novel numerical techniques have evolved which lead to very efficient algorithms. The model is applicable to substrates of arbitrary thickness and cylinder size. Furthermore, it has been checked against a variety of limiting cases, including microstrip on a flat substrate, and it has been found to provide results with excellent accuracy. The analytical extraction of the quasi-static behavior from the dynamic Green's function introduces considerable simplicity in developing the algorithm.

关键词： Microstrip antennas Microstrip antenna arrays Transmission lines Algorithm design and analysis distributed parameter circuits Conformal mapping Laplace equations Capacitance Frequency

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ELECTROSTATIC UNBALANCE OF UNTRANSPOSED SINGLE CIRCUIT LINES

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IEEE TRANSACTIONS ON POWER APPARATUS AND SYSTEMS 1968年第1期PA87卷 24-&页

作者： GROSS, ETB CHIN, W Rensselaer Polytechnic Institute Troy NY USA British Columbia Hydro and Power Authority Vancouver BC Canada

This study is the continuation of research concerning electromagnetic and electrostatic unbalances of untransposed overhead lines.[1]-[6] The purpose of this investigation is to apply symmetrical component analysis to evaluate approximate expressions for ground displacement and negative sequence electrostatic unbalance factors of single circuit lines.

关键词： Voltage Conductors distributed parameter circuits Wires Equations Electromagnetic analysis Electrostatic analysis Transmission line theory Fault currents Circuit faults

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EQUIVALENT TRANSFORMATIONS FOR THE MIXED LUMPED BRUNE-TYPE SECTION AND UNIFORM TRANSMISSION-LINE

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1990年第8期38卷 1114-1122页

作者： SATO, R OHBA, Y NEMOTO, Y KOBAYASHI, K TOHOKU UNIV ELECT COMMUN RECH INSTSENDAIMIYAGI 980JAPAN YAMAGATA UNIV FAC ENGNDEPT ELECT ENGNYONEZAWA 992JAPAN

As an analytical method for nonuniform transmission lines (NTLs) equivalent transformations are extended to a more general case, namely a mixed lumped Brune-type section and a uniform transmission line (unit element, UE). circuits consisting of a cascade connection of a lumped Brune section and a UE are equivalent to one consisting of a cascade connection of a nonuniform transmission line whose characteristic impedance distribution is expressed with a trigonometric function and a lumped Brune section. This equivalent transformation method is easily applied to a circuit consisting of a lumped C section and a UE. The equivalent circuit is a circuit consisting of an NTL and a lumped C section. In this case, the characteristic impedance distribution of the NTL may be expressed in terms of a hyperbolic function. Exact network functions of the NTLs are easily obtained from the equivalent circuits without solving the telegrapher's equation. By considering the limiting case of these equivalent transformations, equivalent transformations for circuits consisting of a cascade connection of a lumped resonance circuit and a circuit and a uniform transmission line are derived.

关键词： UNITED ELECTRIC Cascade connections distributed parameter circuits equivalent circuits non-threshold logic Circular Functions Uniform Transmission Lines Uniforms Equivalent Resonant circuits Characteristic impedance

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AN UPDATE ON THE CIRCUIT APPROACH TO CALCULATE SHIELDING EFFECTIVENESS

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IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY 1988年第3期30卷 211-221页

作者： BRIDGES, JE IIT Research Institute Chicago IL USA

The shielding effectiveness of an enclosure at low frequencies can be computed using a circuit approach. Not only does this technique include the effects of the properties of the shield material, but it also includes the details of the geometry of the enclosure. This approach allows a nonempirical consideration of mesh enclosures and the effects of resistive seams in enclosure walls. By working with the circuit analogue, penetration by transient fields can be computed. Essentially the enclosure is viewed as an antenna. In the case of magnetic shielding effectiveness, the enclosure is viewed as a short-circuited loop antenna. In the case of electric-field penetration, the enclosure is viewed as a fat electric dipole. Using this characterization and exact solutions where available, the current distribution on the outside of the enclosure is determined. Based on the current distribution, the penetrating fields are computed. The equations are developed in such a way as to preserve a lumped circuit analogue for the low-frequency region. The basic circuit equations for magnetic field penetration are rederived from a rigorous solution. Rules to estimate the rise time, fall time, and peak magnitudes of transient penetrating fields are developed. The electric shielding effectiveness is developed in a similar manner.< >

关键词： Bridge circuits Equations Geometry Magnetic shielding Magnetic circuits Transmission line theory distributed parameter circuits Dipole antennas Current distribution Electromagnetic shielding

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NON-OPTIMUM COMPENSATION SCHEMES FOR SINGLE POLE RECLOSING ON EHV DOUBLE CIRCUIT TRANSMISSION-LINES

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IEEE TRANSACTIONS ON POWER DELIVERY 1993年第2期8卷 651-659页

作者： THOMANN, GC LAMBERT, SR PHALOPRAKARN, S Power Technologies Inc. USA Electricity Generating Authority of Thailand Thailand

Optimum reactor compensation configurations for implementing single pole reclosing on EHV, double circuit lines have been previously investigated1. However, for some applications, optimum schemes may not be practical due to constraints such as reactor physical size, operating constraints and existing equipment. The performance of non-optimum schemes is considered, using an EGAT (Electricity Generating Authority of Thailand) 328 km, 500 kV, double circuit line as an example. Several compensation schemes were considered, and their performance examined with both circuits in service and with one circuit out for maintenance. The analysis indicated that some schemes with reactor values considerably off optimum still provided reasonable performance.

关键词： distributed parameter circuits Circuit faults Inductors Capacitance Power transmission lines Voltage Power generation Joining processes Samarium Performance analysis

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CHARACTERISTICS OF MICROSTRIP TRANSMISSION LINES

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IEEE TRANSACTIONS ON ELECTRONIC COMPUTERS 1967年第2期EC16卷 185-&页

作者： KAUPP, HR Radio Corporation of America Camden NJ USA

Equations are developed which accurately describe the characteristic impedance and signal propagation delay for narrow microstrip transmission lines. Differences in signal propagation delay for microstrip, strip line, and coaxial cables are compared as a function of dielectric constant. The characteristic impedance equation is verified through comparison with experimental results for impedance values from 40 to 150 ohms. The sensitivity of characteristic impedance to variations in physical parameters, such as dielectric constant, line width, and board thickness, is presented. Finally the equation is shown to yield exceptionally accurate results when the inherent inaccuracies of the physical measurements are considered.

关键词： Microstrip Transmission lines Sampling methods Impedance Arithmetic Propagation delay Strips Dielectric constant Equations distributed parameter circuits

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THEORETICAL AND EXPERIMENTAL CHARACTERIZATION OF NONSYMMETRICALLY SHIELDED COPLANAR WAVEGUIDES FOR MILLIMETER-WAVE circuits

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1989年第12期37卷 2020-2027页

作者： ALESSANDRI, F GOEBEL, U MELAI, F SORRENTINO, R MICREL SPA DEPT MILLIMETER WAVEFLORENCEITALY

A quasi-planar structure, the nonsymmetrically shielded coplanar waveguide (NSCPW), is proposed as a quasi-TEM transmission line with advantageous characteristics for millimeter-wave circuit applications. Advantages in terms of broadband behavior and ease of machining, as well as device mounting and substrate mounting, are pointed out. An experimental method is developed which allows the evaluation of the transmission line spectrum in a very wide frequency band (15:1) with a single transmission measurement. The experimentally evaluated propagation characteristics of the dominant and higher order modes are shown to be in excellent agreement with the theoretical predictions based on the generalized transverse resonance technique. This method is also used for an extensive characterization of the structure in terms of characteristic impedance and useful frequency band

关键词： Coplanar transmission lines Transmission line theory distributed parameter circuits Coplanar waveguides Millimeter wave circuits Machining Transmission line measurements Frequency measurement Resonance Impedance

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HIERARCHICAL ANALYSIS OF HIGH-FREQUENCY INTERCONNECT NETWORKS

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IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED circuits AND SYSTEMS 1994年第5期13卷 658-664页

作者： STARZYK, JA AT&T BELL LABS ULSI SYST RES LABHOLMDELNJ 07733

Interconnect networks are analyzed using symbolic frequency domain analysis and an exact model of a distributed line. The analyzed network must have a tree structure and may contain transmission lines as well as other linear two-ports with specified transmission matrices. Any regular portion of the interconnect network is analyzed hierarchically with significant savings in analysis time. Numerical Laplace transform inversion is used to obtain time domain solutions. The event driven approach is adopted to reduce analysis time. Time complexity of the method depends on the regularity of the analyzed network, and can be as low as a logarithmic function of the number of elements for a hierarchically organized tree structure.

关键词： Frequency Integrated circuit interconnections Delay estimation Laplace equations distributed parameter circuits Delay effects Transmission lines Tree data structures Digital circuits Propagation losses

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EQUIVALENT TRANSFORMATIONS FOR THE MIXED LUMPED RICHARDS SECTION AND distributed TRANSMISSION-LINE

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1988年第4期36卷 635-641页

作者： NEMOTO, Y SATAKE, M KOBAYASHI, K SATO, R TOHOKU UNIV FAC ENGNDEPT INFORMAT SCISENDAIMIYAGI 980JAPAN YAMAGATA UNIV FAC ENGNDEPT ELECT ENGNYONEZAWAYAMAGATA 992JAPAN TOHOKU GAKUIN UNIV FAC ENGNDEPT ELECT ENGNTAGAJO 985JAPAN

The authors introduce an analysis method for nonuniform transmission lines. Equivalent transformations between a circuit consisting of a cascade connection of a lumped Richards section, an ideal transformer, and a distributed transmission line and one consisting of a cascade connection of a class of a nonuniform transmission line, a lumped Richards section, and an ideal transformer, are given. Characteristic impedance distributions of these nonuniform transmission lines are expressed as hyperbolic or trigonometric functions. It is quite difficult to find the exact network functions of nonuniform transmission lines from the telegraph equation, but by using the equivalent transformation described it becomes possible to obtain exact network functions of a class of nonuniform transmission lines.< >

关键词： Transmission lines distributed parameter circuits Impedance Power transmission lines Transfer functions Gyrators Transmission line matrix methods Telegraphy Equations Information science

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