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Online ISSN 1350-911X Print ISSN 0013-5194

Electronics Letters

Volume 12, Issue 1, 8 January 1976

Volumes & issues:

Volume 12, Issue 1

8 January 1976

Correction to open-resonator permittivity and loss measurements
  • Author(s): R.J. Cook  and  R.G. Jones
  • Source: Electronics Letters, Volume 12, Issue 1, p. 1 –2
  • DOI:  10.1049/el:19760001
  • Type: Article
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  • p. 1 –2 (2)
    A correction to the length of a dielectric sample placed in an open resonator is derived using perturbation theory. The correction takes account of the additional volume of sample extending beyond the curved phase front normally assumed in the beam wave theory. Results are presented for a range of sample lengths of a high-density polyethylene, which illustrate the improvement obtained in both permittivity and loss measurements when this correction is used.
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Lumped-circuit model for inductor-capacitor hybrid
Radar m.t.i.: a comparison of 2nd-order digital-filter realisations when the stopband is very narrow
Sensitivity functions of distributed-parameter eigenvalue control systems
Dispersion in optical fibres with stairlike refractive-index profiles
  • Author(s): J.A. Arnaud  and  W. Mammel
  • Source: Electronics Letters, Volume 12, Issue 1, p. 6 –8
  • DOI:  10.1049/el:19760005
  • Type: Article
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  • p. 6 –8 (3)
    In multimode circularly symmetric fibres whose index distribution is a stairlike approximation of an optimum profile, the modal dispersion increases as the number of steps decreases. For a fibre with Δn/n=0.02 and a core radius of 40 μm, numerical calculations based on wave optics show that the r.m.s. impulse response width at λ=1 μm increases from 0.075 ns/km for the smooth optimum profile to 0.23 ns/km for 40 steps of equal areas. Thus an important conclusion of the analysis is that one should avoid introducing steps in the refractive-index profile of fibres for optimum results.
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1/f noise in multicarrier systems
Investigation of a setup procedure for triangular permutation arrays
  • Author(s): J.C. Majithia ; R. Bhar ; Y. Tamboli
  • Source: Electronics Letters, Volume 12, Issue 1, p. 9 –10
  • DOI:  10.1049/el:19760007
  • Type: Article
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  • p. 9 –10 (2)
    A setup procedure for setting all the cells of a triangular permutation network is described. This procedure is based on an earlier published inductive proof of the ability of the triangular array to set up any input/output permutation. The procedure requires N−1 step to set up a size-N triangular array, and can be easily programmed or implemented using straightforward hardware techniques. Various simple extensions of this procedure were also investigated to reduce the average number of cells to be switched from one mode (bend or cross) to another.
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High-peak-power 2nd-harmonic l.s.a. sources
Acoustic flexural mode on a ridge of semi-infinite height
  • Author(s): P.E. Lagasse  and  A.A. Oliner
  • Source: Electronics Letters, Volume 12, Issue 1, p. 11 –13
  • DOI:  10.1049/el:19760009
  • Type: Article
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  • p. 11 –13 (3)
    Several recent analyses of the flexural mode on a ridge of semi-infinite height (plate edge) contain results which are inconsistent and generally limited in range. We present accurate theoretical calculations, and a set of measurements which agree very well with them, and we compare our results with the earlier ones. We also give a simple model which yields other wave properties (such as the vertical decay rate), indicate and verify quantitatively the wave behaviour at high frequencies, and show the relation between this wave type and the usual flexural mode on a ridge of finite height.
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White-light response of an m.o.s.t.
Determination of the diameter of unclad optical fibre
  • Author(s): P.L. Chu
  • Source: Electronics Letters, Volume 12, Issue 1, p. 14 –16
  • DOI:  10.1049/el:19760011
  • Type: Article
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  • p. 14 –16 (3)
    It is shown that the backward-scattered interference pattern of an unclad optical fibre can be adequately described by Airy's rainbow theory. A formula is derived from which the diameter of the fibre may be calculated if the position of the rainbow maximum is measured from the scattered pattern. The error involved in this method is less than 3%. Comparison between this method and Marcuse's method is also made, and it is found that the present method can lead to a more reliable result.
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Power combination of broadband TRAPATT amplifiers
Performance of sulphur-ion-implanted GaAs f.e.t.s
Exact circuit design using inefficient c.t.d.s
Comparison of overhead factors in message-switched and packet-switched networks
  • Author(s): A. Shaheen  and  J.C. Majithia
  • Source: Electronics Letters, Volume 12, Issue 1, p. 20 –21
  • DOI:  10.1049/el:19760015
  • Type: Article
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  • p. 20 –21 (2)
    Overhead factors for data networks using message-switching or packet-switching techniques are defined and analysed. The transmission lines are assumed to have only random errors and the acknowledgments are handled on a ‘stop-and-wait’ strategy. For packet switching, the packet size used is such that, in each case, the overhead factor is minimised. Results show that the overheads for packet switching tend to be much higher than for message switching when the line error rates are low, i.e. better than 10−5. It is concluded that, although packet switching has several significant merits, these are achieved at the expense of a substantial increase in overheads.
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Optimum all-pole approximation of exp(−sT)
Decomposition of nonlinear operators into ‘harmonic’ components, with applications to audio signal processing
Effect of d.c. bias level on the spectrum of GaAs lasers operated with short pulses
Comment on ‘New multiple feedback active RC network’
Self interference by rain scattering in satellite radio links
New method of registration for electron-beam lithography
Method of modelling linear time-invariant distributed-parameter systems by pseudorandom binary sequences
White-emitting a.c. electroluminescent powder layers for flat-panel television
  • Author(s): A.G. Fischer
  • Source: Electronics Letters, Volume 12, Issue 1, p. 30 –32
  • DOI:  10.1049/el:19760023
  • Type: Article
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  • p. 30 –32 (3)
    For application in future flat-panel television, where a thin-film transistor matrix on glass addresses a superimposed e.l. powder layer, we have developed e.l. layers which emit white light by using part of the blue e.l. emission to excite the fluorescence of organic dyes which are dissolved in the resinous embedding medium. Using a monograin particle layer and a black back electrode, we have achieved high visual contrast in a bright ambient, and operation at less than 50 V. Fabrication is described. The design can be extended to colour-t.v. panels.
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Prediction of h.f. circuit availability
Singular perturbation methods in the design of linear multivariable tracking systems
Improved method for evaluating the static parameters of the Ebers–Moll transistor model
Erratum: Propagation of an impulsive plane wave with arbitrary angle of incidence and polarisation in isotropic-plasma halfspace
Erratum: Alternative way for numerical steady-state analysis of forward-biased p-n junction devices

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