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AN EFFICIENT ALGORITHM FOR THE CALCULATION OF PARASITIC COUPLING BETWEEN LINES IN MICS

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1993年第8期41卷 1287-1293页

作者： DUNN, JM HOWARD, LC LARSON, K BELVOIR RES DEV & ENGN CTR DEPT ARMYFT BELVOIRVA 22060

A new algorithm is developed to calculate parasitic coupling between transmission lines in an efficient manner. The algorithm works by using the currents and voltages on the lines in the absence of parasitics to calculate independent voltage and current sources which then give the approximate coupling strength between the various lines. These sources are easy to place in a CAD circuit program. The algorithm is demonstrated on a double-stub filter structure. The observed splitting of the resonance, for this particular example, is modeled by using dependent sources, as calculated from the independent sources.

关键词： Microwave integrated circuits Coupling circuits Circuit simulation Transmission line theory distributed parameter circuits Computational modeling Frequency Voltage Design automation Microwave filters

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OPTIMAL SELF-DAMPED LOSSY TRANSMISSION-LINE INTERCONNECTIONS FOR MULTICHIP MODULES

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IEEE TRANSACTIONS ON circuits AND SYSTEMS II-ANALOG AND DIGITAL SIGNAL PROCESSING 1992年第11期39卷 765-771页

作者： FRYE, RC CHEN, HZ AT and T Bell Laboratories Murray Hill NJ USA AT&T Bell Labaratories Murray Hill NJ USA

Interconnections in multichip modules, because of their lengths and signal frequencies, usually operate in the near-transmission-line regime. Their small cross-sectional area, dictated by the need for high wiring density, leads to lines that are necessarily lossy. In this paper, we present an analysis of lossy transmission-line interconnections that determines the minimum loss needed to obtain stable signal propagation in unterminated lines. This analysis leads to a simple, robust design criterion that can be easily applied to most multichip module circuits. We present an example of this approach for a particular module structure, and discuss the operating limits imposed by this method.

关键词： Propagation losses Transmission lines Multichip modules Integrated circuit interconnections Silicon Wiring Impedance Voltage Power transmission lines distributed parameter circuits

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COMPUTATIONALLY EFFICIENT SIMULATION OF A LOSSY TRANSMISSION-LINE WITH SKIN EFFECT BY USING NUMERICAL INVERSION OF LAPLACE TRANSFORM

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IEEE TRANSACTIONS ON circuits AND SYSTEMS I-REGULAR PAPERS 1992年第11期39卷 861-868页

作者： CHANG, EC KANG, SM UNIV ILLINOIS COORDINATED SCI LAB URBANA IL 61801 USA UNIV ILLINOIS CTR ADV STUDY URBANA IL 61801 USA

We present two new computationally efficient methods for simulating a lossy transmission line. The lossy transmission line is represented as a two-port network which consists of characteristic impedances and waveform generators. Equivalent circuits are synthesized for the characteristic impedances, and the values of the waveform generators are computed by performing convolution integrals. Simulated annealing optimization technique is used for optimal synthesis of the characteristic impedances. For the evaluation of the convolution integrals, two different methods were devised. Method 1 uses the impulse response of the exponential propagation function H(s), while Method 2 utilizes the unit step response of the same function. Method 1 can be applied to simulation of a general RLCG transmission line. Method 2, which utilizes a numerical technique, is well suited for simulating a lossy transmission line with or without skin effect. It is demonstrated that both methods improves the previous art by a factor of two or more in terms of the computation time.

关键词： Computational modeling Propagation losses Transmission lines Circuit simulation distributed parameter circuits Impedance Signal generators Circuit synthesis Network synthesis Convolution

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ON THE DESIGN OF PLANAR MICROWAVE COMPONENTS USING MULTILAYER STRUCTURES

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1992年第1期40卷 67-72页

作者： SCHWAB, W MENZEL, W Department of Engineering Sciences Microwave Techniques University of Ulm (EBS) Ulm Germany

The design of planar microwave components using multilayer configurations with potentially arbitrary numbers of dielectric layers and metallization planes is described. Analysis and design are based on a combination of a spectral domain immittance matrix approach and standard CAD methods. To verify the design procedure, three examples-a microstrip-slot-line-microstrip transition, a stripline band-pass filter, and a coupler with lines on different sides of a common ground plane-are investigated theoretically and experimentally.

关键词： Nonhomogeneous media Transmission line theory distributed parameter circuits Transmission line matrix methods Microstrip filters Stripline Coplanar transmission lines Transmission line discontinuities Resonance Dielectrics

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CONTINUOUSLY SCALED TRANSMISSION LINES WITH APPLICATIONS TO LOG-PERIODIC ANTENNAS

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 1969年第1期AP17卷 2-&页

作者： JONES, KE MAYES, PE University of Illinois Urbana-Champaign IL USA

The results of several studies on network models of log-periodic structures are described. A nonuniform, continuously scaled transmission line is introduced to simulate the near-field behavior of the log-periodic dipole array. The frequency-independent performance of the continuously scaled line represents the ideal, which is approximated by using lumped elements in a log-periodic structure. It is particularly significant to note that 1) the continuously scaled model predicts the observed input impedance behavior of log-periodic dipole arrays even when the frequency is approaching the high-frequency limit of the antenna, 2) phase velocity on the transmission line model in the active region and at the input region is also found to agree with experimental data, 3) increasing the Q of the loading element increases the coupling to the reflected wave, resulting in increased variations of impedance. Decreasing the angle of taper of the antenna will compensate for the increase in Q . Based on this model, it is shown that true size reduction may be achieved only at the expense of efficiency.

关键词： Log periodic antennas Frequency Transmission line theory Impedance Dipole antennas Geometry Predictive models Voltage distributed parameter circuits Loaded antennas

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3-DIMENSIONAL INTERCONNECT ANALYSIS USING PARTIAL ELEMENT EQUIVALENT-circuits

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IEEE TRANSACTIONS ON circuits AND SYSTEMS I-FUNDAMENTAL THEORY AND APPLICATIONS 1992年第11期39卷 974-982页

作者： HEEB, H RUEHLI, AE IBM Thomas J. Watson Research Center Yorktown Heights NY USA

The partial element equivalent circuit (PEEC) technique has been applied successfully for many years to model the electrical properties of high-speed interconnect. In the PEEC approach, interconnect is modeled as a passive RLC circuit with partial inductances and capacitances calculated from a quasi-static solution of Maxwell's equations. The PEEC models are useful for three reasons. They can be combined with other circuit models (like transistors) into an input circuit for a circuit simulator like SPICE or ASTAP. They work equally well in the time and frequency domains and it is easy to model some interconnect in great detail and some crudely. In this paper we extend the PEEC approach to dielectrics and we include retardation (the effect of the finite speed of light). We show that the new retarded partial element equivalent circuit (rPEEC) technique is equivalent to a full-wave solution while keeping the above mentioned advantages of the PEEC approach. In a simple PC-board example we demonstrate noticeable errors when retardation is neglected. We compare rPEEC results with measurements, analytical calculations, and a full-wave solver, and show good agreement.

关键词： Integrated circuit interconnections Equivalent circuits RLC circuits distributed parameter circuits Finite difference methods Time domain analysis Wires Capacitance Maxwell equations Frequency domain analysis

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DIMENSIONING OF NEARBY SUBSTATIONS INTERCONNECTED GROUND SYSTEM

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IEEE TRANSACTIONS ON POWER DELIVERY 1988年第4期3卷 1605-1614页

作者： SOBRAL, ST COSTA, VS CAMPOS, MS GOLDMAN, B MUKHEDKAR, D ELETROBRAS RIO DE JANEIRO BRAZIL ECOLE POLYTECH MONTREAL H3C 3A7 QUEBEC CANADA

The ground-mat dimensioning of two or more neighboring interconnected substations is treated. A set of calculation procedures, using the decoupled method, is given. It is shown that the electric neighborhood of nearby substations depends on the space constant (or characteristic length) of the ground circuits interconnecting them. A simple procedure is presented for determining the suitable number of aluminium-conductor steel-reinforced ground wire spans near a substation, which are needed to allow a reduction of the ground grid conductor extension.< >

关键词： Substations Integrated circuit interconnections Power transmission lines distributed parameter circuits Soil Power cables Senior members Fault currents Conductors Power generation

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APPLICATION OF AN EXPERT SYSTEM TO DECISIONS ON COUNTERMEASURES AGAINST SNOW ACCRETION ON TRANSMISSION-LINES

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IEEE TRANSACTIONS ON POWER SYSTEMS 1988年第3期3卷 1052-1058页

作者： NARA, K YAMASHIRO, S YANAURA, Y KITAMI INST TECHNOL KITAMIHOKKAIDO 090JAPAN HOKKAIDO ELECT POWER CO SAPPOROHOKKAIDOJAPAN

An expert system is discussed which assists in deciding the deicing countermeasures against snow accretion on 187 kV and 66 kV transmission lines. The distinctive features of the system are the application of an expert system to the completely hierarchical design of the whole system, and ranking by messages instead of by certainty factor. The system has been developed as a prototype using micro-Prolog and is under trial use in real power-system operations. An example illustrates the consulting behavior of the system.< >

关键词： Expert systems Snow Power transmission lines Prototypes Power system measurements distributed parameter circuits Power systems Power system modeling Current measurement Power measurement

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Broadband and compact impedance transformers for microwave circuits

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IEEE MICROWAVE MAGAZINE 2006年第4期7卷 56-+页

作者： Bahl, Inder J. Tyco Elect Co Integrated Prod Business Unit MA COM Roanoke VA 24019 USA

Most microwave circuits and antennas use impedance transformers. In a conventional power amplifier, large number of inductors and capacitor or transmission line sections are use to realize an impedance transformer. This article presents an asymmetric broadside-coupled microstrip TLT (transmission line transformer) on the GaAs substrate. This matching network can be easily implemented using any monolithic microwave integrated circuit (MMIC) process supporting multilevel metallization.

关键词： Impedance Transformers Microwave circuits Power transmission lines distributed parameter circuits MMICs Microwave antennas Broadband amplifiers Power amplifiers Inductors

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MEASUREMENT OF LINEWIDTH OF SINGLE CRYSTAL FERRITES BY MONITORING REFLECTED WAVE IN SHORT-CIRCUITED TRANSMISSION LINE

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IEEE TRANSACTIONS ON MAGNETICS 1967年第3期MAG3卷 521-+页

作者： BADY, I Electronic Components Laboratory U.S. Army Mectrollics Command Fort Monmouth NJ USA

A method is described for measuring the linewidth of single crystal ferrite spheres, based on monitoring the reflected wave in a short-circuited transmission line. The ferrite sample is at the short circuit, or a half wavelength from it. An equation is given for the normalized equivalent resistance of a ferrite sphere at resonance, and a comparison made between theory and experiment. At C band, resonance curves of undercoupled spheres are relatively free of distortion. However, at frequencies of 2 GHz and lower, resonance curves are often distorted. Moreover, it is frequently possible to obtain a discrete number of different resonant curves at a given frequency. Data are given on errors due to nonideal microwave components. A method of displaying a resonance curve on an oscilloscope, using swept fields, is described.

关键词： Transmission line measurements Ferrites Monitoring Resonance Transmission line theory distributed parameter circuits Frequency Electrical resistance measurement Wavelength measurement Equations

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