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Online ISSN 1350-911X Print ISSN 0013-5194

Electronics Letters

Volume 7, Issue 17, 26 August 1971

Volumes & issues:

Volume 7, Issue 17

26 August 1971

Pulse measurements of transient thermal response and temperature of avalanching p–n junction
  • Author(s): J. Nigrin
  • Source: Electronics Letters, Volume 7, Issue 17, p. 481 –483
  • DOI:  10.1049/el:19710326
  • Type: Article
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  • p. 481 –483 (3)
    A method is presented for measuring the junction temperature and the transient thermal response of oscillator-mounted avalanche diodes; the method requires an exact knowledge of the temperature dependence of the diode breakdown voltage. The junction temperature can be measured with unchanged accuracy within the measured temperature range of the breakdown voltage. The transient response as close as a few microseconds after the initiation of the junction-temperature step can be measured.
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Propagation and radiation characteristics of low-permittivity dielectric cones
  • Author(s): P.J.B. Clarricoats  and  C.E.R.C. Salema
  • Source: Electronics Letters, Volume 7, Issue 17, p. 483 –485
  • DOI:  10.1049/el:19710327
  • Type: Article
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  • p. 483 –485 (3)
    An approximate theory is proposed to explain the propagation and radiation characteristics of low-permittivity conical dielectric waveguides of narrow flare angle. Theoretical radiation patterns are predicted and compared with those obtained for corrugated conical horns. The considerable similarity which is predicted is supported by experimental results obtained at 9 GHz using cones made from expanded polystyrene.
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Discrete Wiener–Lee transforms
  • Author(s): M.K. Sundareshan
  • Source: Electronics Letters, Volume 7, Issue 17, p. 485 –486
  • DOI:  10.1049/el:19710328
  • Type: Article
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  • p. 485 –486 (2)
    The use of Wiener–Lee transforms to construct one of the frequency characteristics, magnitude or phase of a network function, when the other characteristic is given graphically, is indicated. This application is useful in finding a realisable network function whose magnitude or phase curve is given. A discrete version of the transform is presented, so that a digital computer can be employed for the computation.
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Possible advance in thermionic conversion
Evaluation of open-circuit impedance matrix of 2-port RLC networks
Computing transfer functions from state-space matrices
Variation of microstrip losses with thickness of strip
  • Author(s): R. Horton ; B. Easter ; A. Gopinath
  • Source: Electronics Letters, Volume 7, Issue 17, p. 490 –491
  • DOI:  10.1049/el:19710332
  • Type: Article
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  • p. 490 –491 (2)
    The attenuation in microstrip lines has been calculated by relating the longitudinal components of current to the charge profiles of a static solution. The calculation has been performed for varying thicknesses of strip to examine the mechanism of loss for very thin strips, where the penetrating fields from both surfaces of the strip overlap. The results are presented in the form of a universal loss curve for the particular geometries studied, indicating the minimum thickness of strip to be used to advantage.
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Acoustic-surface-wave television filters
  • Author(s): D. Chauvin ; E. Coussat ; E. Dieulesaint
  • Source: Electronics Letters, Volume 7, Issue 17, p. 491 –492
  • DOI:  10.1049/el:19710333
  • Type: Article
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  • p. 491 –492 (2)
    A computer optimisation procedure is described which has been successfully used to synthetise acoustic-surface-wave filters according to French television specifications. A model for interdigital transducers is used which reduces the synthesis problem to that of finding a set of transducer dimensions. The experimental frequency response of such a filter is in good agreement with the predictions.
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Evaluation of Gram-Charlier coefficients
Evaluation of a quadratic performance criterion for 3-term control loops
  • Author(s): N.E. Gough
  • Source: Electronics Letters, Volume 7, Issue 17, p. 493 –495
  • DOI:  10.1049/el:19710335
  • Type: Article
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  • p. 493 –495 (3)
    A general procedure for evaluating a weighted mean-square-error criterion for multivariable systems is presented. By incorporating pure time delays as Padé approximations, the method may be applied to interacting computer control loops which are subjected to random load disturbances, thus leading to optimal-control-algorithm settings. A matrix solution of the integral criterion using Gaussian elimination obviates the need for standard-integral tables.
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Dynamical study of the transferred-electron effect by a Monte Carlo technique
Measurement of minority-carrier lifetime in silicon at microwave frequencies using microstrip techniques
  • Author(s): V. Makios  and  R.E. Thomas
  • Source: Electronics Letters, Volume 7, Issue 17, p. 496 –497
  • DOI:  10.1049/el:19710337
  • Type: Article
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  • p. 496 –497 (2)
    A method is described for measuring minority-carrier lifetime in semiconductor samples of any thicknes and dimensions (e.g. silicon is used in device fabrication). The semiconductor sample is used as the dielectric of a microstrip line sandwitched between a ground plane of electroplated gold (or other metal) and electroplateted strip conductor delineated using standard photoresist masking techniques.
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Point-matching technique for rectangular-cross-section dielectric rod
Acoustic surface waves on isopaustic glass
  • Author(s): C.P. Sandbank  and  M.B.N. Butler
  • Source: Electronics Letters, Volume 7, Issue 17, p. 499 –501
  • DOI:  10.1049/el:19710339
  • Type: Article
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  • p. 499 –501 (3)
    The construction of transducers for launching surface waves on nonpiezoelectric substrates is described. It is shown that efficient launching can be obtained using zinc-oxide films with a thickness of less than 5% the acoustic wavelength. Amorphous substrates can be used, and results are given for isopaustic glass which enables temperature stability of a few parts per million per degree Celsius to be obtained.
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Simple negative-impedance convertor
Propagation in shielded microslot on ferrite substrate
Transformations in an RC-active network synthesis procedure
In situ measurements of the complex propagation constant in rocks for frequencies from 1 MHz to 10 MHz
  • Author(s): R.N Grubb  and  J.R. Wait
  • Source: Electronics Letters, Volume 7, Issue 17, p. 506 –507
  • DOI:  10.1049/el:19710343
  • Type: Article
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  • p. 506 –507 (2)
    The complex propagation constant for frequencies between 1 MHz and 10 MHz has been measured for propagation between bore holes in granite rock at a site near Raymond, Colo., USA. The measurement technique consisted in Comparisons of the phase and amplitude of signals received on two identical dipole antennas spaced at different distances on a radial from an isolated transmitter. The conductivity and permittivity of the medium calculated from the propagation constant are compared with laboratory measurements of samples from the same boreholes, and reasonably good agreement is obtained.
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