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European Conference on Microwave

作者： Christian Staeger Abteilung Forschung und Entwicklung Bern PTT Switzerland

A new principle of Broadband Matching Network in Transmission Line circuits is described which can be used for transformer, coupler and other multistructure applications. In this new design, the distance between succeeding impedance steps or coupling holes is much smaller than a quarter of a wavelength. This results in a greater number of steps or holes and lower single step reflections for a given coupling function or overall impedance transform ratio. The performance is therefore considerably improved. As an illustrative example, a waveguide directional coupler using the new network principle is shown. This technique can also be used for the development of very wide bandwidth (10:1) components.

关键词： Coupling circuits Reflection Impedance Frequency distributed parameter circuits Directional couplers Voltage Sun Computer networks Application software

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Comments on "Dissipation and Scattering Matrices of Lossy Junctions" [Letters]

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IEEE Transactions on Microwave Theory and Techniques 1974年第1期22卷 75-75页

作者： E. Schwartz

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THEORY AND DESIGN OF SURFACE ACOUSTIC-WAVE MULTISTRIP COUPLER

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1973年第4期MT21卷 206-215页

作者： MARSHALL, FG NEWTON, CO PAIGE, EGS ROY RADAR ESTAB GREAT MALVERN WORCESTERSHIRE ENGLAND

The multistrip coupler performs the function of a directional coupler for freely propagating surface acoustic waves on a piezoelectrically active substrate. Its operation is analyzed in terms of a transmission line based equivalent circuit. Expressions are obtained for the directionality (transmission and reflection) in terms of the number of coupler strips and the acoustic frequency. Theory and experiment are shown to be in very good agreement. 50-percent metallization is found to give optimum performance; progressive increase in the proportion of the coupler area covered with metal is shown to involve a progressive change from an inline field model to a crossed-field model. Outside a stopband region it is found that a simplified expression for the directionality is valid; this greatly facilitates component design. Design criteria for multistrip components are discussed in terms of substrate and bandwidth requirements. An analysis is included of resistive and capacitative effects on coupling, and problems associated with coupling between dissimilar materials are discussed.

关键词： Surface acoustic waves Acoustic waves Coupling circuits Directional couplers Acoustic propagation Transmission line theory distributed parameter circuits Equivalent circuits Acoustic reflection Strips

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TRANSMISSION-LINE MODELS FOR USE WITH CIRCUIT-SYSTEM ANALYSIS PROGRAMS

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE 1973年第6期NS20卷 72-81页

作者： LUBELL, JI MELZER, SM TRW SYST GRP REDONDO BEACHCA 90200

Techniques for modeling multiconductor transmission lines for use with the SCEPTRE computer program are presented. The transmission line models developed can be modified for compatibility with other circuit/ system transient analysis programs and are amenable to modification to include nuclear weapon effects. The general modeling approach has been to develop computationally efficient and accurate terminal models which can be arbitrarily loaded at the source and load ends and which can be used in conjunction with nonlinear electronic circuit models using either simplified or discrete modeling techniques. The concept of the method is to derive a set of transfer functions in the Laplace domain relating forward and backward traveling waves on the line to voltages and currents at the source and load ends of the line, approximate the transfer functions with a set of orthonormal polynomials, and represent the resulting rational polynomials in the time domain with state variable differential equations. For the multiconductor case, the orthogonal characteristics of wave propagation are used to decouple the modes of propagation except at the source and load boundary condition circuits.

关键词： distributed parameter circuits Circuit analysis Multiconductor transmission lines Transfer functions Polynomials Transient analysis Nuclear weapons Electronic circuits Voltage Differential equations

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CIRCUIT PROPERTIES OF COUPLED DISPERSIVE TRANSMISSION-LINES

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IEEE TRANSACTIONS ON CIRCUIT THEORY 1973年第1期CT20卷 56-64页

作者： NOBLE, DF CARLIN, HJ CORNELL UNIV SCH ELECT ENGNITHACANY 14850

A circuit model is used to present the basis forthe existence of complex propagation constants and backward wave modes in lossless coupled dispersive transmission lines. In particular, for the 2-line lossless case, conditions for realizing complex modes, as well as the possible forms for the \omega-\beta diagram are given. Methods for approximating the mode behavior of lossless waveguide systems, uniform in the propagation direction, but with transverse plane inhomogeneities, are presented using coupled-line models. These methods are derived from the Schelkunoff representation of such a waveguide structure by an infinite set of coupled TE and TM dispersive transmission lines. The techniques used in this paper depend on an approximation which reduces the infinite number of lines to a finite number. One approximation method interpolates the parameters of a realizable 2-line system to approximate the behavior of the infinite line system up to a frequency in the vicinity of the secondlowest eigenmode. A second method is a systematic network procedure for eliminating coupling ports of the infinite structure so as to obtain a finite number of coupled lines to approximate the mode behavior. These two methods are illustrated by 2-line models for round waveguide loaded with a dielectric rod. The mode behavior of the loaded guide is surprisingly well approximated by both the 2-line models.

关键词： Coupling circuits Dispersion distributed parameter circuits Propagation losses Propagation constant Planar waveguides Tellurium Transmission lines Approximation methods Frequency

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EQUIVALENT CIRCUIT FOR PARTIALLY DIELECTRIC-FILLED RECTANGULAR WAVEGUIDE JUNCTIONS

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1973年第6期MT21卷 403-411页

作者： CHANG, CTM ARGONNE NATL LAB ARGONNEIL 60439

The problem of electromagnetic-wave propagation in junctions between two symmetrically, partially dielectric-filled waveguides was investigated, and the solution is presented in the form of a two-port equivalent circuit, This equivalent circuit includes an ideal 1:1 transformer, which is connected to transmission lines with impedances equal to those of the two waveguides, in cascade with a T network. Elements of the T network and the characteristic wave impedances of these partially dielectric-filled waveguides have been studied, and the results are presented in graphs for different dielectric constants, slab thicknesses, and operating frequencies.

关键词： Equivalent circuits Electromagnetic waveguides Waveguide junctions Waveguide components Impedance Electromagnetic propagation distributed parameter circuits Dielectric constant Slabs Frequency

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ELASTIC AND PIEZOELECTRIC PROPERTIES OF ALPHA-HGS

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PROCEEDINGS OF THE IEEE 1973年第5期61卷 678-679页

作者： SAPRIEL, J LANCON, R CTR NATL ETUD TELECOMMUN BAGNEUXFRANCE CTR NATL ETUD TELECOMMUN ISSY MOULINEAUXFRANCE

Elastic, piezoelectric, and dielectric constants of -HgS (Cinnabar) were measured mainly by the resonant method. Piezoelectric -HgS thickness transducers when coupled with bulk -HgS would realize perfect matching in a... 详细信息

关键词： Couplers distributed parameter circuits Dielectric measurements Insertion loss Voltage Admittance Coupling circuits Transmission lines Multiconductor transmission lines

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SEQUENCING HADAMARD TRANSFORM

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IEEE TRANSACTIONS ON AUDIO AND ELECTROACOUSTICS 1973年第5期AU21卷 472-473页

作者： BHAGAVAN, BK POLGE, RJ UNIV ALABAMA DEPT ELECT ENGNHUNTSVILLEAL 37807

The fast computational algorithm based on matrix Kronecker products yields the Hadamard transform in a scrambled order of sequencies. A computational algorithm is developed to arrange the transform in an increasing or... 详细信息

关键词： Transmission line matrix methods Circuit synthesis Frequency Sufficient conditions Digital filters Stability criteria Polynomials Circuit theory Transmission line theory distributed parameter circuits

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SYNCHRONOUSLY TUNED FERRITE POWER LIMITER FOR BROAD-BAND SYSTEMS APPLICATION

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IEEE TRANSACTIONS ON MAGNETICS 1973年第3期MAG9卷 529-531页

作者： DIXON, S USA ELECTR TECHNOL DEVICES LABFT MONMOUTHNJ 07703

This investigation describes analytical and experimental results obtained on a broadband ferrite limiter at K u band which utilizes a synchronously tuned waveguide bandpass structure. This device is aimed at providing protection for communications and electronic warfare systems over a bandwidth from 12 to 30 percent at K u -band frequencies. The circuit consists of a series of three cavities in a waveguide transmission line, the coupling being accomplished via the irises or symmetrical inductive slits between cavities. Because of this cavity structure, the observed threshold power levels have been reduced by an order of magnitude. By utilizing a combination of single crystal YIG and lithium ferrite rods, the threshold power for limiting varies from 0.75 W at 16.0 GHz to 2.0 W at 17.0 GHz with an insertion loss of 0.9 dB.

关键词： Ferrites Power system protection Electronic warfare Bandwidth Frequency Power transmission lines distributed parameter circuits Coupling circuits Waveguide discontinuities Lithium

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GIGAHERTZ-RATE 100-V PULSE-GENERATOR

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IEEE JOURNAL OF SOLID-STATE circuits 1973年第1期SC 8卷 63-66页

作者： KAWAMOTO, H RCA LABS PRINCETON NJ 08540 USA

A high-density electron-hole plasma generated within a high-efficiency avalanche diode induces a sharp, high-voltage pulse on a transmission line. A novel gigahertz-rate pulse generator has been constructed utilizing the high- efficiency microwave avalanche diode. An impedance discontinuity within the circuit gives rise to a sharp pulse with undistorted waveform, which keeps retriggering the diode for a self-excited pulse generation. The peak- to-peak amplitude of the pulse is 125 V into a 50-/spl Omega/ load. The pulsewidth is 400 ps, the rise time 100 ps, and the fall time 200 ps.

关键词： Pulse generation Semiconductor diodes Pulse amplifiers Plasma measurements Voltage Plasma waves Electron traps Power transmission lines distributed parameter circuits Pulse circuits

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