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Online ISSN 1350-911X Print ISSN 0013-5194

Electronics Letters

Volume 9, Issue 21, 18 October 1973

Volumes & issues:

Volume 9, Issue 21

18 October 1973

Transducer and multistrip-coupler performance for leaky surface waves on lithium niobate
  • Author(s): C.O. Newton
  • Source: Electronics Letters, Volume 9, Issue 21, p. 481 –482
  • DOI:  10.1049/el:19730354
  • Type: Article
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  • p. 481 –482 (2)
    Measurements are reported of the properties of leaky surface waves propagating on 41° and 64° rotated cuts of LiNbO3 both on the free surface and under metal. Transducer and multistrip-coupler performance are consistent with piezo electric-coupling constants of 18° and 12%, respectively. Insertion-loss and spurious-signal-level results show that the interdigital transducer with few finger pairs is better matched to a metallised propagation path than to a free surface path for leaky waves.
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High-purity glasses for optical-fibre communication
  • Author(s): C.E.E. Stewart ; D. Tyldesley ; B. Scott ; H. Rawson ; G.R. Newns
  • Source: Electronics Letters, Volume 9, Issue 21, p. 482 –483
  • DOI:  10.1049/el:19730355
  • Type: Article
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  • p. 482 –483 (2)
    High-purity soda-lime-silicate glasses have been prepared by coupling power radio frequencies directly into the glass, held in a ‘cold’ silica crucible. Optical losses were measured at 1.06 μm, and the glasses were analysed for transition-metal impurities. The loss results approach the target of 20 dB/km required for a Commercial optical-communication system.
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Tracking sensitivity with peripheral-horn autotrack
Rectangular universal iterative array
Transient analysis of waveguides with curved boundaries
High-precision measurement of 2e/hthat uses cryogenic electronic components
Evaluation of data reconstruction using Walsh functions
Avalanche-diode amplifier-upconvertor
ZnS sputtered photocells
  • Author(s): H. Murray
  • Source: Electronics Letters, Volume 9, Issue 21, p. 491 –493
  • DOI:  10.1049/el:19730362
  • Type: Article
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  • p. 491 –493 (3)
    Variations in the photovoltage and photocurrent of thin sputtered films of ZnS, sandwiched between sputtered Al electrodes and a thin transparent Au counterelectrode, have been studied as functions of the wavelength of the incident light. Reversal phenomena give evidence for the existence of two opposite photoeffects in these structures: an intrinsic effect across thc bandgap and an extrinsic effect depending on the nature of electrodes. Measurements were performed with a u.v.-photoeffect signal/noise ratio of more than 100 and a threshold discrepancy of less than 2%.
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Predictive algorithms for some elementary functions in radix 2
Computer correction of a microwave network analyzer without accurate frequency measurement
Comparison of surface-wave reflection coefficients for different metals on quartz
Secant algorithm applied to the solution for the steady-state condition in nonlinear-circuit analysis
Correlator performance and the squared coherency
Increase in surface-acoustic-wave velocity produced by ion implantation in quartz
  • Author(s): P. Hartemann  and  MME.M. Morizot
  • Source: Electronics Letters, Volume 9, Issue 21, p. 497 –498
  • DOI:  10.1049/el:19730368
  • Type: Article
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  • p. 497 –498 (2)
    An increase in the surface-acoustic-wave velocity, arising from surface-state modification, is reported for the first time. It was obtained by a 100 keV ion implantation on quartz substrates tested at a frequency of 180 MHz. 1H+, 4He+7Li+9Be+, 11B+ and 40A+ ions have been used. The flux is about 1016 ions/cm2 and the surface waves propagate faster on the implanted surface than on the unimplanted part, because a crystalline-to-amorphous transition is created by ion implantation. The greatest relative-velocity increase is measured using Li+ and He+ ion bombardment, and was found to be equal to 1.1% at 180 MHz. The insertion losses of the delay lines are not significantly changed by the implantation. A 1000 Å step height has been measured at the boundary of the implanted surface, as a consequence of the increase in volume of the implanted part.
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Invariant-sinusoid approximation method for recursive digital filters
Adaptive logic circuits for digital stochastic computers
Pole sensitivity of a digital filter with multishift sequences in each sampling interval
Fast algorithm for finding a forest of a linear graph
Comparative performance of equal-valued-capacitor active RC structures
Cheby̅shev approximation of arbitrary frequency response for nonrecursive digital filters with linear phase
Frequency multiplier for square waves
Some errors in the calculation of the radiation patterns of reflector antennas, using Kirchhoff integration
  • Author(s): J. Dijk  and  E.J. Maanders
  • Source: Electronics Letters, Volume 9, Issue 21, p. 510 –512
  • DOI:  10.1049/el:19730376
  • Type: Article
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  • p. 510 –512 (3)
    It is demonstrated that calculation of the antenna patterns of reflector antennas, by means of Kirchhoff integration, leads to unreliable far sidelobes, if theoretical truncated feed patterns are used. The integrated radiation pattern does not yield 4π, but a greater value; the calculated noise temperature is therefore too high. Integration of calculated radiation patterns over 4π steradians is recommended to control the results.
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