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European Conference on Microwave

作者： B. Schiek J. Kohler W. Schilz Philips GmbH Forschungslaboratorium Hamburg Hamburg Germany Philips GmbH Forschungslaboratorium Hamburg 2 Hamburg 54

Meanderline phase shifters in microstrip are badly matched (vswr ≈ 2), due to the difference in phase velocity of the odd and even mode of the coupled transmission lines. This is overcome by a stepped impedance design, allowing to realize e.g. a 90° phase shifter with a return loss better than 30 db across an octave bandwidth. Straightforward design equations are derived and confirmed by measurements on MIC's in the frequency range 4 to 8 GHz and X-band.

关键词： Microstrip Phase shifters Frequency Microwave integrated circuits distributed parameter circuits Impedance matching Couplings Bandwidth Equations Transmission line measurements

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SIMPLIFICATIONS FOR ANALYSIS OF INTERDIGITAL SURFACE-WAVE DEVICES

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IEEE TRANSACTIONS ON SONICS AND ULTRASONICS 1975年第2期SU22卷 105-114页

作者： MATTHAEI, GL WONG, DY OSHAUGHNESSY, BP UNIV CALIF DEPT ELECT ENGN & COMP SCISANTA BARBARACA 93106

Equivalent circuits for interdigital transducers were previously published which predict identical terminal properties as those obtained using the equivalent circuit methods of Smith, et al., but which are much simpler in that they utilize a maximum of five component parts regardless of how many fingers are used in the transducer. The parameters of these minimum-complexity equivalent circuits are restated in a more convenient. way than previously, using surface-wave parameters adapted from those used by Smith, et al. The use of these circuits facilitates analysis with a minimum of mathematical impedament. Short-circuit admittance parameters for the overall properties of apodized or unapodized transducer pairs on a substrate are obtained in relatively simple. compact form. Using. these parameters the overall transmission properties for any electrical terminations are easily calculated. The minimum-complexity equivalent circuits involve the evaluation of certain Fourier and Hilbert transforms in order to obtain the frequency functions for some of their parts. Closed-form equations are given for these transforms for cases of transducers with or without phase reversals or phase coding. One of the components of the minimum-complexity equivalent circuit is a transmission line. It is shown that at least for transducers with up to 60 fingers a satisfactory approximate method for accounting for transducer finger refiections effects is to simply include small steps in the impedance of the transmission line in order to represent the finger discontinuities. Copyright © 1975 by The Institute of Electrical and Electronics Engineers, Inc.

关键词： Equivalent circuits Fingers Piezoelectric transducers Circuit analysis Surface impedance Admittance Fourier transforms Frequency distributed parameter circuits Reflection

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COMPENSATION OF LONG-DISTANCE AC TRANSMISSION-LINES BY SHUNT CONNECTED REACTANCE CONTROLLERS

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IEEE TRANSACTIONS ON POWER APPARATUS AND SYSTEMS 1975年第2期PA94卷 655-664页

作者： WOODFORD, DA TARNAWECKY, MZ MANITOBA HYDRO WINNIPEG MANITOBA CANADA UNIV MANITOBA WINNIPEG MANITOBA CANADA

A proposal is presented for compensation of long ac transmission lines entirely by shunt devices designated as reactance controllers. Fundamental design of the reactance controller as a transmission line shunt compensating device is established. Application of reactance controllers to transmission lines is described as well as a theoretical approach for the Transmission Planner to evaluate controlled shunt reactance compensation for future and existing transmission schemes.

关键词： Transmission lines Shunt (electrical) Voltage control Power transmission lines Transmission line theory Inductors Capacitors Switches Low voltage distributed parameter circuits

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MODELING OF TRANSPOSITIONS AND DOUBLE CIRCUIT TRANSMISSION-LINES IN SWITCHING SURGE CALCULATIONS

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IEEE TRANSACTIONS ON POWER APPARATUS AND SYSTEMS 1975年第2期PA94卷 242-251页

作者： DABULEANU, A SEMLYEN, A UNIV TORONTO DEPT ELECT ENGNTORONTOONTARIOCANADA

The paper extends the method of recursive convolutions for the calculation of electro-magnetic transients on transmission lines with ground return to discretely transposed lines and double circuit lines. A review of the recursive convolution method is first given, completed with a starting procedure for the calculation of transients from a known steady state. Effects of transpositions, such as mode reflections and mode conversion, are then discussed. For double circuit lines, it is shown that they can be represented as two equivalent single circuit lines, thus making possible the use of most simple subroutines for line response calculations.

关键词： distributed parameter circuits Switching circuits Surges Convolutional codes Voltage Power transmission lines Equations TV Frequency dependence History

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EFFICIENT MINIMAX DESIGN OF NETWORKS WITHOUT USING DERIVATIVES

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1975年第10期23卷 803-809页

作者： MADSEN, K NIELSEN, O SCHJAERJACOBSEN, H THRANE, L TECH UNIV DENMARK INST NUMERICAL ANALDK-2800 LYNGBYDENMARK TECH UNIV DENMARK ELECTROMAGNETICS INSTDK-2800 LYNGBYDENMARK

A new minimax network optimization algorithm not requiring derivatives has been developed. It is based on successive linear approximations to the nonlinear functions defining the problem. Adequate modeling of distributed parameter circuits for optimization purposes often involves parasitic, etc., which makes the gradient computation by the adjoint network method or related methods rather complicated, and often numerical errors are introduced in the gradients. Consequently, the algorithm is found to be of particular relevance in optimum design of practical microwave networks. The relative advantages of the proposed algorithm are established by comparison with known gradient and nongradient algorithms based on optimization of cascaded transmission-line transformers. The relevance to microwave filter design is demonstrated by an example which represents an improvement of analytical filter design results. Finally, optimum broad-band design of a practical coaxial transferred-electron reflection-type amplilier is carried out by means of the proposed method. The results are supported by experimental verification.

关键词： Minimax techniques Microwave filters Linear approximation distributed parameter circuits Optimization methods Computer networks distributed computing Algorithm design and analysis Transmission lines Transformers

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TAPPED-LINE COUPLED TRANSMISSION-LINES WITH APPLICATIONS TO INTERDIGITAL AND COMBLINE FILTERS

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1975年第12期23卷 1007-1012页

作者： CRISTAL, EG HEWLETT PACKARD CO PALO ALTOCA 94304

Exact, general, open-wire-line equivalent circuits for tapped-line combline and interdigital arrays are derived using a combination of graph transformations and induction. A significant feature of the equivalent circuits is that they do not require commensurate length sections. The equivalent circuit for tapped-line interdigital arrays is utilzed to develop design equations for tapped-line interdigital filters.

关键词： Transmission lines Equivalent circuits Filters Coupling circuits distributed parameter circuits Transmission line theory Equations Geometry Design optimization Inductors

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IMPROVING TV TRANSMITTER SYSTEM VSWR AND RELATED FREQUENCY-RESPONSE

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IEEE TRANSACTIONS ON BROADCASTING 1975年第1期BC21卷 7-14页

作者： GLUYAS, TM RCA CORP COMMUN SYST DIVGIBBSBORONJ 08026

This paper establishes the quantitative relation between a TV transmitter load VSWR and the system frequency response. The need for a low value of VSWR is stressed, particularly for multimode transmitting systems.

关键词： TV Transmitters Frequency response Reflection Impedance Switches Radio frequency Power transmission lines distributed parameter circuits Delay lines

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CLOSED-FORM SOLUTIONS FOR VOLTAGE-STEP RESPONSE OF OPEN AND SHORTED distributed RC LINES

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IEEE TRANSACTIONS ON circuits AND SYSTEMS 1975年第6期CA22卷 534-541页

作者： DEILY, GR HRB SINGER INC STATE COLLPA 16801

The current response of a finite distributed RC line to a voltage-step driving function has a closed-form solution in terms of elliptic theta functions. This seems to have gone unrecognized in previous circuit theory literature. Different types of theta functions will appear depending on whether the solution is for open-circuited or short-circuited terminations. Furthermore, the voltage response to the same driving function can be expressed in terms of integrals of theta functions. These integrals constitute a possibly new set of higher transcendental functions, to be denoted here as "diffusion functions." Relationships among and properties of the various solutions and functions are given in mathematical identities and families of curves. Thus expressing the solutions in terms of individual functions whose properties are well-documented, rather than using the mostly opaque series form, allows a more distinct view of the physical behavior of the distributed RC line to emerge.

关键词： Closed-form solution Voltage Boundary conditions Telegraphy Laplace equations Circuit theory Integral equations Transmission line theory distributed parameter circuits Kelvin

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HARMONICALLY PUMPED STRIPLINE DOWN-CONVERTER

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1975年第3期MT23卷 271-275页

作者： SCHNEIDER, MV SNELL, WW BELL TEL LABS INC CRAWFORD HILL LABHOLMDELNJ 07733

A novel thin-film down-converter which is pumped at a submultiple of the local-oscillator frequency has given a conversion loss which is comparable to the performance of conventional balanced mixers. The converter consists of two stripline filters and two Schottky-barrier diodes which are shunt mounted in a strip transmission line. The conversion loss measured at a signal frequency of 3.5 GHz is 3.2 dB for a pump frequency of 1.7 GHz and 4.9 dB for a pump frequency of 0.85 GHz. The circuit looks attractive for use at millimeter-wave frequencies where stable pump sources with low FM noise are not readily available.

关键词： Stripline Frequency conversion Transistors Performance loss Mixers Filters Schottky diodes Strips distributed parameter circuits Transmission line measurements

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PICOSECOND-PULSE SEQUENTIAL WAVEFORM GENERATION

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1975年第12期23卷 1048-1049页

作者： CRONSON, HM SPERRY RES CTR SUDBURYMA 01776

This short paper describes a novel method of generating a pulse sequence using step-recovery diodes (SRDs) shunting a transmission line. Individual pulses in the train may have rise times less than 60 ps with amplitudes greater than 10 V. The many potential applications of the device include a short RF pulse generator, an FM generator, and a high-speed word generator.

关键词： Pulse generation Diodes Filters Power transmission lines Radio frequency Metrology Voltage distributed parameter circuits Resistors Senior members

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