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A TRAVELING-WAVE FERROMAGNETIC AMPLIFIER

PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS 1958年第4期46卷 700-706页

作者： TIEN, PK SUHL, H Bell Telephone Laboratories Inc. Murray Hill NJ USA

A theory of a ferromagnetic traveling-wave amplifier of parametric type is presented here. Amplification of signal power in the form of growing waves is obtained in a propagating structure which is partially or totally embedded in a ferromagnetic medium. The structure, in one of its possible forms, possesses two propagating modes: one of the modes is excited by a signal at the input end, and the other is used as an idling circuit. The structure should also support a traveling wave supplied by a local oscillator which provides, through the motion of the magnetization, a time-varying coupling between the two propagating modes. The problem is essentially that of two coupled transmission lines with a time-dependent coupling coefficient. Optimum conditions for amplification are derived. A structure consisting of two pairs of parallel wires is calculated to illustrate the general principles.

关键词： Local oscillators Coupling circuits Power transmission lines Microwave amplifiers distributed parameter circuits Frequency Ferrites Magnetization Microwave propagation Wires

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The Use of Communication Facilities in Transmission Line Relaying

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Transactions of the American Institute of Electrical Engineers 1933年第2期52卷 595-602页

作者： Neher, J.H. Engineering Department Philadelphia Electric company Philadelphia PA USA

This paper outlines the fundamentals of a method of obtaining overall protection of transmission lines by a comparison of the relative direction of fault current flow at the line ends by means of a communication system. The results obtained are equivalent to differential protection. The carrier-current pilot or d-c pilot wire schemes which have been introduced during the past few years are applications of this method. The optional use of a communication system to link the trip circuits at the ends of a transmission line provided with any conventional form of relay protection is described. This insures the simultaneous tripping of both line ends for all fault positions. The various types of communication systems adaptable for relay purposes are described and discussed in regard to coordination with the telephonic communication, telemetering or supervisory control systems employed as adjuncts of the power system. Copyright 1933. By A. I. E. E.

关键词： Transmission lines Relays Power transmission lines Protective relaying Protection Power system relaying Fault currents distributed parameter circuits Circuit faults

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A Low Inductance Tunnel Diode Mount

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Proceedings of the IEEE 1964年第1期52卷 75-76页

作者： Schneider, M.V. Bell Telephone Labs. Inc. Holmdel N. J. United States

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COUPLED STRIP TRANSMISSION LINE WITH 3 CENTER CONDUCTORS

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1966年第10期MT14卷 446-&页

作者： YAMAMOTO, S AZAKAMI, T ITAKURA, K Department of Electrical Communication Engineering School of Engineering Osaka University Osaka Japan Division of Electrical Engineering Nara Technical College Nara Japan

An exact analysis is made for the shielded coupled strip transmission line with three center conductors. By means of the immittance matrices presented, the electrical behavior of the coupled strip transmission line of this type may be completely described. Design formulas which enable one to evaluate the cross-section dimensions from the desired values of characteristic immittances are derived for the two kinds of the line configurations. Equivalent circuits of the two-port networks for various port conditions are also presented. In addition, an application is discussed involving the asymmetrical coupled strip transmission line with two center conductors. The appendix gives the derivation of the design formulas by means of conformal mapping techniques.

关键词： Strips Transmission lines Conductors Transmission line theory Transmission line matrix methods Multiconductor transmission lines distributed parameter circuits Coupling circuits Microwave filters Independent component analysis

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The Effects of Interconnections on High-Speed Logic circuits

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IEEE Transactions on Electronic Computers 1963年第5期EC-12卷 476-487页

作者： Jarvis, D.B. Milliard Research Laboratories Redhill Surrey United Kingdom

By way of worked examples in typical but somewhat idealized cases the effect on circuit speed of circuit interconnections is studied. The source, calculation and minimization of interconnection crosstalk is also discussed. It is shown that high-speed circuitry must be miniaturized and the implications are discussed. COPYRIGHT © 1963—THE INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, INC.

关键词： Integrated circuit interconnections Logic circuits Capacitance Delay effects Transmission line theory distributed parameter circuits Minimization Crosstalk Diodes Delay lines

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110-Kv. Transmission Line for Oak Grove Development of Portland Railway, Light and Power Company

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Transactions of the American Institute of Electrical Engineers 1923年 42卷 967-969页

作者： Wakeman, H.R. Lines, W.H. Portland Railway & Light Co. United States Portland Railway & Light Co. United States

Review of the Subject.—This paper covers the design of the 110-kv. transmission line to transmit energy from the new Oak Grove development of the Portland Railway, Light and Power Company to the city of Portland, Oregon, a distance of 54 miles. The company now has three hydroelectric developments aggregating 52,000 kw. supplied from the same general watershed from which energy is transmitted to Portland over five 60-kv. circuits, only one of which is on steel towers. The problem was to design a transmission line to most economically handle the three 30,000-kv-a. units as installed at the new development and to tie in with the existing transmission system. The following factors were considered in determining the design: 1. Transmission voltage 2. Conductor capacity 3. Maximum conductor tension 4. Assumed maximum mechanical loading conditions 5. Type of supporting structures Consideration was also given to the physical characteristics of the country through which the line must be built. For 14.8 miles the line will be located in the United States Government Forest Reserve, which is very heavily timbered, and accordingly cost of clearing will be very high, averaging $15,000 a mile, even after credit for merchantable timber is allowed. This fact, outside of other considerations, required a minimum number of circuits. To reduce clearing costs as much as possible, the line was located along the river gorge necessitating 55 angles, a few as great as 60 deg., and 28 river crossing spans, varying from 400 to 1800 feet. After considering various types of supporting structures, three types of double circuit, heavy rigid steel towers were decided upon as follows: Type A towers, to be used on tangents up to 800-foot spans, also on curves up to 10 deg., the spans not exceeding 500 feet;suspension insulators to be used. Type B towers, to be used on tangents up to 1700-foot spans, also on curves from 8 to 30 deg., the spans not exceeding 800 feet for the larger curves;suspension in

关键词： Power transmission lines Rail transportation Conductors Costs Rivers Cities and towns Steel Poles and towers distributed parameter circuits Power generation economics

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A COMPACT LOW PROFILE TRANSMISSION LINE ANTENNA-TUNABLE OVER GREATER THAN OCTAVE BANDWIDTH

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 1966年第6期AP14卷 701-&页

作者： WANSELOW, RD MILLIGAN, DW Division of Northrop Corporation Nortronics Newbury Park CA USA

Techniques for extending the frequency tuning range of low profile top loaded antennas to greater than one octave are described. The compact antenna is a directly driven resonant radiator (DDRR) which consists of a vertical post radiator, the height of which is less than 0.05\lambda at the highest operating frequency, and which is top loaded by a loosely spiraled unbalanced transmission line which employs a multiple-capacitor tuning scheme to achieve a wide-band, tunable resonant antenna. The measured antenna circuit Q is of the order of 100 or greater and the radiation efficiency, over a large ground plane, is greater than 50 percent that of a quarter-wave monopole over the full operating range.

关键词： Transmission line antennas Bandwidth Loaded antennas Frequency Tuning Resonance distributed parameter circuits Circuit optimization Broadband antennas Tunable circuits and devices

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A Wire-Grid Lens Antenna of Wide Application Part II: Wave-Propagating Properties of a Pair of Wire Grids with Square, Hexagonal or Triangular Mesh

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IRE Transactions on Antennas and Propagation 1962年第4期10卷 416-429页

作者： Andreasen, M.G. Tanner, R.L. TRG-West A Division of TRG Incorporated Menlo Park Calif. United States Stanford Research Institute Menlo Park United States

A study of the wave-propagating properties of a pair of wire grids with square, hexagonal or triangular mesh is presented. The results of the investigation contain the information needed for designing a wire-grid lens antenna. Of the three mesh types investigated, the hexagonal mesh is found to exhibit the least amount of dispersion and anisotropy for a constant mesh area. Copyright © 1962, by The Institute of Radio Engineers, Inc.

关键词： Lenses Wire Anisotropic magnetoresistance Optical design Antennas and propagation Transmission line theory distributed parameter circuits Frequency Testing Integrated circuit interconnections

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A PRECISE SWEEP-FREQUENCY METHOD OF VECTOR IMPEDANCE MEASUREMENT

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PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS 1951年第2期39卷 209-209页

作者： ALSBERG, DA Bell Telephone Laboratories Inc. Murray Hill NJ USA

The impedance of a two-terminal network is defined completely by the insertion loss and phase shift it produces when inserted between known sending and receiving impedances. Recent advances in precise wide-band phase and transmission measuring circuits have permitted practical use of this principle. Reactive and resistive impedance components are read directly from a simple graphical chart in which frequency is not a parameter. The basic principle described promises attractive possibilities in many cases of impedance measurements where present methods are inadequate.

关键词： Impedance measurement Phase measurement Transmission line measurements Insertion loss Loss measurement Frequency measurement distributed parameter circuits Repeaters Position measurement Mutual coupling

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Protective Practices as a Criterion for High-Voltage Transmission Design

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Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems 1954年第1期73卷 465-473页

作者： Rorden, Harold L. Gens, Ralph S. Boonneville Power Administration Portland Oreg. United States

Technological advances and closely engineered practices have kept the cost of high-voltage transmission from rising in a period of inflation. By applying the experiences that have contributed to this economy into the higher voltages, design is under way to transmit large blocks of power at 345 kv on the Bonneville Power Administration system in the Pacific Northwest. Practices that have made this possible include revised concepts of protection from abnormal voltages, always an item of high cost, and one which warrants continued study. © 1954 IEEE. All rights reserved.

关键词： Protection Power transformer insulation Wire Costs Voltage Power engineering and energy distributed parameter circuits Steel Cable insulation Circuit breakers

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