# Electrical Engineers, Proceedings of the Institution of

## Filter Results

Displaying Results 1 - 25 of 34
• ### Conjugately matched parametric upconvertors

Publication Year: 1965, Page(s):447 - 451
Cited by:  Papers (1)
| | PDF (585 KB)

The types of 3-frequency parametric upconvertors that have useful amounts of gain whilst being conjugately matched at both input and output terminals are reviewed. A detailed analysis is undertaken of 4-frequency upconvertors having similar properties. It is shown to be necessary for all such 4-frequency convertors, under high-gain conditions, to have certain properties in common. In all cases, th... View full abstract»

• ### Derivation of cavity coupling to feeder from tuning curves

Publication Year: 1965, Page(s):452 - 456
| | PDF (437 KB)

A method of finding a cavity coupling factor Qx from the separation in wavelength between branches of tuning curves obtained by moving a short circuit in the feeder is described. This is complementary to a derivation from slopes proposed earlier. The alternative method is suitable over a large range of Qx (from about 30, where the formulas obtained for Qx are least accurate, to 105 or more). The h... View full abstract»

• ### Low-loss single balanced modulators utilising minority-carrier storage

Publication Year: 1965, Page(s):457 - 462
| | PDF (545 KB)

It is shown that the minority-carrier-storage phenomenon may be utilised to achieve a variation in the mark/space ratio of the switching function in rectifier modulators. In a number of such modulators this variation results in a decrease of conversion loss, and these circuits are examined in detail. Differences in performance with square-wave and sine-wave carriers are considered, and the perform... View full abstract»

• ### Measurement of semiconductor properties in a slotted-waveguide structure

Publication Year: 1965, Page(s):463 - 468
| | PDF (694 KB)

A method of measurement of the complex permittivity of a semiconductor, in which a sample is introduced into a rectangular waveguide by means of insulated slots in the broad walls, is discussed. The corrections required to relate the behaviour of such a system to that of an idealised structure, which has a convenient theoretical solution, are described, and details are given of a microwave bridge ... View full abstract»

• ### Transmission-line directional couplers for very broad-band operation

Publication Year: 1965, Page(s):469 - 476
Cited by:  Papers (15)
| | PDF (910 KB)

The development of coupled-transmission-line theory and applications has extended the bandwidth of certain microwave components to one decade or more. A review of the theory is presented in the most simple general form, which enables the effects of tolerances and perturbations to be calculated. A survey of available coupled-line configurations is presented, including a new printed re-entrant type,... View full abstract»

• ### Screened surface waves and some possible applications

Publication Year: 1965, Page(s):477 - 482
Cited by:  Papers (8)
| | PDF (648 KB)

A pure surface wave requires, in principle, unbounded space outside the supporting surface, thus permitting the field in the transverse plane to decay, without obstruction, to zero at an infinite distance from the surface. Such a wave cannot therefore be contained within a screen, unless the bounding surface matches precisely the field impedance at the point of its location. A surface of this kind... View full abstract»

• ### Birefringence in semiconductor magnetoplasmas for ultramicrowave gyratory devices

Publication Year: 1965, Page(s):483 - 486
| | PDF (449 KB)

High-density low-effective-mass plasmas in semiconductors allow plasma and cyclotron frequencies in the ultramicrowave range. It is proposed that the birefringence of these magnetoplasmas be utilised for gyratory devices such as circulators, isolators etc. at millimetre wavelengths. The conditions for the feasibility of these devices are discussed and are shown to be satisfied in practical cases. ... View full abstract»

• ### Subjective quality of television pictures impaired by long-delayed echoes

Publication Year: 1965, Page(s):487 - 492
Cited by:  Papers (9)
| | PDF (1049 KB)

Echoes are a well known form of impairment in television reception, but precise information on the subjective effect they cause has been scanty, and the limits for echo in specifications of television transmission systems have been set on a somewhat arbitrary basis. Using a previously proposed quality-grading method, tests have therefore been made of the effect of single undistorted echoes, having... View full abstract»

• ### Beam-positioning radar systems utilising continuous scanning techniques

Publication Year: 1965, Page(s):493 - 496
| | PDF (514 KB)

This paper describes the advantages that accrue from the use of an electronic beam-positioning radar system for both searching and tracking a complex target environment. It is also shown that the principal properties of such a system may be achieved using a radar system with transmitting and receiving beams scanning continuously at different rates. This technique results in the same power-distribu... View full abstract»

• ### Cylindrical arrays with electronic beam scanning

Publication Year: 1965, Page(s):497 - 505
Cited by:  Papers (3)
| | PDF (1120 KB)

This paper describes methods for enabling the directional pattern of a cylindrical array to scan continuously and repetitively through 360Â° by electronic means. This requires that the circular aperture distribution corresponding to the far-field directional pattern should be subjected to rotation relative to the fixed array. Methods are described for independent control of the amplitude and phase... View full abstract»

• ### Scottish Electronics and Measurement Section: Chairman's address. Maintenance of electronic equipment

Publication Year: 1965
| | PDF (93 KB)

First Page of the Article
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• ### Wideband low-frequency discriminator with small nonlinearity

Publication Year: 1965, Page(s):507 - 508
| PDF (207 KB)
• ### Thermoelectric cooling applied to the absolute measurement of microwave power

Publication Year: 1965, Page(s):508 - 510
| PDF (348 KB)
• ### Discontinuous temperature control

Publication Year: 1965, Page(s):511 - 524
Cited by:  Papers (1)
| | PDF (1633 KB)

1.6 million homes were solely electrically heated in the United States in 1963; by 1980, the predicted number is 19 million. In most of these residences temperature is controlled by a 2-position line-voltage thermostat in each room. Suitable continuous and quasicontinuous temperature-control systems have been developed, but the price trend of the semiconductor devices they employ indicates that th... View full abstract»

• ### Polarised mho distance relay. New approach to the analysis of practical characteristics

Publication Year: 1965, Page(s):525 - 535
Cited by:  Papers (9)
| | PDF (1042 KB)

The use of the polarised mho distance relay for the protection of high-voltage lines has become widespread. Up to the present time, the relay has been thought to be of limited use in the protection of short lines, owing to its relatively small reach for arcing faults. However, recent practical tests have shown that the actual performance is considerably better than that predicted by theory. A new ... View full abstract»

• ### Scottish Centre: Chairman's address. The electrical engineer amongst his pioneers

Publication Year: 1965
| | PDF (143 KB)

First Page of the Article
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• ### East Anglian Sub-Centre: Chairman's address. Electric motorsߝthe beginnings and the future

Publication Year: 1965, Page(s):536 - 537
| | PDF (270 KB)

First Page of the Article
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• ### The goodness of a machine

Publication Year: 1965, Page(s):538 - 541
| | PDF (562 KB)

The action of electromagnetism can be explainedÂ¿ in terms of relativistic corrections to the inverse-square law of electric charges or of any convenient analogy. One of the commonest is that of the electric and magnetic circuits. What constitutes a goodÂ¿ magnetic circuit and a `goodÂ¿ electric circuit in this context is generally recognised, but it is not so easy to define what one means by a ... View full abstract»

• ### Discussion on "The goodness of a machine" and "Rotor windings for induction motors with arc-shaped stators"

Publication Year: 1965, Page(s):541 - 542
| PDF (175 KB)
• ### Time-optimal control of a linear diffusion process

Publication Year: 1965, Page(s):543 - 548
Cited by:  Papers (1)
| | PDF (611 KB)

The paper describes how to solve some of the problems encountered in studying the time-optimal control of a distributed-parameter system. The problems are illustrated by considering the very simple example of a system, whose behaviour is described by the one-dimensional heat-conduction or diffusion equation, in which it is desired to make the temperature zero at all points in the slab in minimum t... View full abstract»

• ### Stability criteria for linear control systems

Publication Year: 1965, Page(s):549 - 556
Cited by:  Papers (1)
| | PDF (693 KB)

The stability criterion formulated by Nyquist1 is sometimes difficult to apply. The method proved here is algebraic rather than geometric and, for a certain class of problems, leads to a simple technique readily usable in designing systems involving several parameters. The criteria discussed are embodied in three conditions. Thus it is possible to leave some design constants unspecified, and fix t... View full abstract»

• ### Precision resistance measurement using very low-frequency alternating current

Publication Year: 1965, Page(s):557 - 564
Cited by:  Papers (8)
| | PDF (899 KB)

The use of v.l.f. alternating current as an alternative to direct current for precision resistance measurement is discussed. It is shown that this method of measurement usually enables greater bridge-circuit resolution to be obtained because of increased detector sensitivity and a reduction in the effect of thermal e.m.f.s. For typical standard resistors, the changes in resistance from the d.c. va... View full abstract»

• ### Input-transducer errors in binary crosscorrelation experiments

Publication Year: 1965, Page(s):565 - 573
Cited by:  Papers (1)
| | PDF (985 KB)

The theory of determining the impulse response of a system by crosscorrelating the output of the system with the input is outlined. It is pointed out that pseudorandom binary input codes prove particularly convenient in facilitating interpretation of the results, and some useful properties of a class of these codes known as msequences are enumerated. A source of error will occur in experiments usi... View full abstract»

• ### Insulating oils: recent ERA/IEC work

Publication Year: 1965, Page(s):574 - 579
| | PDF (885 KB)

The introduction explains the insulating-liquids committee structure of ERA and its relationship with insulating-oil committees of BSI in Britain and JEC and CIGRÃ internationally. The period since 1958 (the date of the last review) is surveyed, starting with changes made to BS 148 in the 1959 edition and subsequent amendments. The IEC oxidation test is discussed and compared with other national ... View full abstract»

• ### Influence of insulating films on conduction

Publication Year: 1965, Page(s):580 - 585
Cited by:  Papers (2)
| | PDF (749 KB)

This paper gives the results of conduction-current measurements on air-saturated transformer oil using direct voltages and both bare and coated aluminium electrodes. The coated electrodes were covered with a thin plastic insulating film and the variations studied were: (a) both electrodes bare, (b) both electrodes coated, (c) the cathode coated and the anode bare and (d) the anode coated and the c... View full abstract»

## Aims & Scope

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

Full Aims & Scope