# Electrical Engineers, Proceedings of the Institution of

## Filter Results

Displaying Results 1 - 25 of 41
• ### Unified theory of cascade synthesis

Publication Year: 1970, Page(s):665 - 670
Cited by:  Papers (16)
| | PDF (504 KB)

A theory of cascade synthesis is presented in which the basic zero-producing sections (C, D and Brune) are extracted in a unified manner without recourse to nonreciprocal or nonphysical sections. The element values of the various sections are given explicitly in terms of the extracted zeros of transmission, the value of the impedance function and its derivative at the extracted zero. View full abstract»

• ### Successive approximation and feedback p.c.m. encoder for television

Publication Year: 1970, Page(s):671 - 680
| | PDF (2113 KB)

A 7-bit p.c.m. encoder for television, applying the straightforward principle of successive approximation and feedback, has been realised using discrete components. Although the paper represents primarily a feasibility study, the results obtained encourage further investigation using thin-film and hybrid technology. View full abstract»

• ### Nonlinear product-feedback shift registers

Publication Year: 1970, Page(s):681 - 686
Cited by:  Papers (4)
| | PDF (724 KB)

A multiplication procedure is described which may be applied to the polynomial forms of nonlinear feedback shift registers to enable two or more factor polynomials to be replaced by a single higher-order nonlinear feedback shift register. The sequential behaviour of the product-feedback shift register is shown to be related to that of its factors in that its sequences may be reproduced by a sequen... View full abstract»

• ### Design criteria for the mode control of hybrid computer amplifiers

Publication Year: 1970, Page(s):687 - 692
Cited by:  Papers (1)
| | PDF (597 KB)

The unbalance in computing speeds of the various components of present hybrid computers places a constraint on the maximum iteration rate, and hence minimum solution times, that can be achieved. This is particularly true with the mode switching of operational amplifiers, where the main limitations of practical devices are those of accuracy and bandwidth. The design of a 2-mode switch is presented,... View full abstract»

• ### Waves in media with longitudinal and transverse discontinuities

Publication Year: 1970, Page(s):693 - 698
| | PDF (649 KB)

In media with characteristics possessing finite discontinuities, the field problem can be treated by solving a single wave equation, the effect of discontinuities being contained in the coefficients in the equation. This provides an alternative to the conventional approach, in which field quantities are matched at the discontinuities. Two examples with discontinuities in the transverse and longitu... View full abstract»

• ### Numerical determination of microstrip properties using the transverse field components

Publication Year: 1970, Page(s):699 - 703
Cited by:  Papers (8)
| | PDF (797 KB)

A finite-difference method, using the transverse field components as variables, is developed for calculating the properties of waveguides containing nonuniform dielectrics. It is shown how an essential consistency condition in the discretisation may be satisfied. Results are given for the dispersion of the quasi-TEM waves and the cutoff frequencies of higher waves in some typical problems. Other m... View full abstract»

• ### Phase-compensated asymmetric directional couplers for the design of decade-wide quadrature hybrids

Publication Year: 1970, Page(s):704 - 708
| | PDF (589 KB)

Very wideband TEM-mode transmission-line quadrature hybrids having a small phase ripple and optimum ChebÂ¿shev coupling can be realised by compensating the phase characteristics of optimum ChebÂ¿shev asymmetric 3dB couplers by means of allpass networks. Numerical results are given in detailed tabular form which enable hybrids with bandwidths up to at least 12:1 to be designed readily without resor... View full abstract»

• ### Field distribution in multilayered dielectric-loaded rectangular waveguides

Publication Year: 1970, Page(s):709 - 712
Cited by:  Papers (2)
| | PDF (515 KB)

The application of the angular spectrum of plane waves, previously shown by Robinson, and Hamid for the problem of mode propagation in a rectangular waveguide loaded with a single E plane dielectric slab, is extended to an arbitrary number of slabs. The technique employs ray optics and residue calculus and is developed to the point where considerable theoretical advantages are evident when dealing... View full abstract»

• ### Symmetries of the overmoded right-angle corner

Publication Year: 1970, Page(s):713 - 717
| | PDF (571 KB)

Diffraction theory has been used to analyse a symmetrically truncated right-angle corner in a previous paper by Lewin and Crain. An inspection of the diffraction fields radiated by the conducting wedges which define this configuration has given insight into the symmetries which should be exhibited by this waveguide junction. It is emphasised here that, in a closed waveguide structure, all interact... View full abstract»

• ### Optimum design of a Gregorian-corrected spherical-reflector antenna

Publication Year: 1970, Page(s):718 - 734
Cited by:  Papers (6)
| | PDF (1746 KB)

An investigation into the performance of spherical-reflector antennas with Gregorian correctors is described with particular reference to their application in satellite-communications ground stations. Feeds comprising corrugated scalar horns propagatinga balanced HE11 hybrid mode are considered, this choice eliminates cross-polarisation components of field in the spherical-reflector aperture. The ... View full abstract»

• ### Computations of mode-scattering coefficients due to ionospheric perturbations and comparison with v.l.f. radio measurements

Publication Year: 1970, Page(s):735 - 738
Cited by:  Papers (1)
| | PDF (539 KB)

Computations of mode-scattering coefficients arising from ionospheric perturbations at sunrise and sunset lines are reported in the paper. The computations are based on an analysis that exploits the concept that radio waves at low frequencies propagate in a nonuniform, spherical, Earth-ionosphere waveguideÂ¿ with finite, surface-impedance boundaries. The computed data are compared with available ... View full abstract»

• ### Response of dynamic tracking filter for f.m. reception

Publication Year: 1970, Page(s):739 - 740
| PDF (206 KB)
• ### Stability of subconductors of smooth circular cross-section

Publication Year: 1970, Page(s):741 - 750
Cited by:  Papers (6)
| | PDF (1238 KB)

The mechanism of subconductor oscillation has defeated analytical formulation for a considerable period of time. Oscillation inhibitorsÂ¿ have been designed without a true understanding of the underlying destabilising mechanism and, in consequence, none has really proved successful. In the paper, it is shown that subconductor oscillation may be ascribed to classical flutter and that, for lines wi... View full abstract»

• ### Subconductor oscillation: summary of results of recent research at the University of Bristol

Publication Year: 1970, Page(s):751 - 752
| | PDF (321 KB)

Considerable effort has been expended in attempting to explain subconductor oscillation. This oscillation has proved to be a major nuisance ever since increased power requirements necessitated the use of multiconductor bundles on overhead power-transmission lines. In recent publications, the author has pointed to a classical flutter mechanism which is highly sensitive to small changes in the basic... View full abstract»

• ### Electromagnetic characteristics of isolated bundle conductors

Publication Year: 1970, Page(s):753 - 760
| | PDF (946 KB)

With increased voltage for power transmission, bundle conductors have become widely used in recent years. The paper suggests a numerical method of obtaining the electromagnetic characteristics of bundle conductors by a digital computer. The accuracy of the method used is assessed by applying it to isolated conductors, which involve analytic solutions. The method of solution used is successive appr... View full abstract»

• ### Capacitance, attenuation and characteristic impedance of a 132 kV power cable at various frequencies

Publication Year: 1970, Page(s):761 - 765
Cited by:  Papers (1)
| | PDF (595 KB)

The basic transmission characteristics of power cables, such as attenuation and surge impedance as functions of frequency, are required as data for transient analysis and for the interpretation of h.v.-surge recordings. Measurements of capacitance, inductance and associated dielectric and I2R losses for sample lengths of 132 kV power cable have been carried out over a wide frequency range from 50 ... View full abstract»

• ### Distance-protection performance under conditions of single-circuit working in double-circuit transmission lines

Publication Year: 1970, Page(s):766 - 770
Cited by:  Papers (2)
| | PDF (598 KB)

When double-circuit transmission lines are operated with one of the circuits isolated and earthed at both ends, relaying conditions can arise that influence the choice of the forward-reach settings of distance protection. Earth-fault conditions during single-circuit working in this way give rise to apparent-impedance values presented to the protection that are generally less, and to errors in impe... View full abstract»

• ### Short-line fault tests on the CEGB 275 kV system

Publication Year: 1970, Page(s):771 - 784
Cited by:  Papers (2)
| | PDF (1869 KB)

The paper describes the results of a series of short-line fault tests on the 275 kV CEGB system at Thorpe Marsh switching station by a collaborative committee. These tests were planned with two main objectives: cross-checking calculated system characteristics with measured values and the demonstration of circuit-breaker performance, both with as high a fault current as possible. Since the short-li... View full abstract»

• ### Corrigendum: Magnetic properties in axial 50Hz fields of steel core wire for overhead-line conductors

Publication Year: 1970
| PDF (130 KB)
• ### Corrigendum: Optimum design and performance calculations of highly magnetically saturated d.c. machines for large-scale production

Publication Year: 1970
| PDF (130 KB)
• ### Fault-detection scheme for a direct digital control of a.c.-d.c. interconnections

Publication Year: 1970, Page(s):785 - 793
Cited by:  Papers (7)
| | PDF (929 KB)

A fault-detection scheme intended to be capable of providing the necessary information for a direct digital control of a.c.-d.c. convertors is described. The proposed scheme provides fast, safe, unique and unambiguous discrimination between the fault condition and its origin through the initial stages of the fault. It is shown that these requirements can only be achieved by sequential logic. Backu... View full abstract»

• ### Load scheduling of hydroelectric/thermal generating systems using nonlinear programming techniques

Publication Year: 1970, Page(s):794 - 798
Cited by:  Papers (10)
| | PDF (626 KB)

The load scheduling problem of hydroelectric/thermal systems can be split into long-range and short-range problems. The short-range problem is to allocate the hydroelectric energy available at each station over the period of day, so as to meet the load demand and minimise the overall cost of thermal generation. If the head variations in reservoirs are neglected and if the period is discretised, th... View full abstract»

• ### Parsons memorial lecture. Large turbine generators: survey of progress

Publication Year: 1970, Page(s):799 - 810
| | PDF (2208 KB)

First Page of the Article
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• ### Discussion on "Travelling waves in induction machines: input impedance and equivalent circuits"

Publication Year: 1970, Page(s):811 - 812
| PDF (302 KB)
• ### IEE North-Eastern Centre: Chairman's address. Electricity supply in north east Englandߝin retrospect

Publication Year: 1970, Page(s):813 - 816
| | PDF (606 KB)

First Page of the Article
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## Aims & Scope

The Proceedings of the Institution of Electrical Engineers was published by the IET between 1963 and 1979.

Full Aims & Scope