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Electronics Letters

Issue 2 • Date January 23 1969

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Displaying Results 1 - 13 of 13
  • Square-spiral scanning system

    Publication Year: 1969, Page(s):19 - 20
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (266 KB)

    When spatial frequencies in an image are to be related to the signal derived from scanning, a conventional rectangular raster is not ideal, and some form of spiral scan is to be preferred. The principles involved in generating a square-spiral scanning pattern, which scans at a constant rate, are described. View full abstract»

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  • Microwave incremental conductivity of InSb at 77°K in the presence of high steady electric field

    Publication Year: 1969, Page(s):20 - 21
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    Complex microwave incremental conductivity of InSb at 77°K in the presence of a high steady electric field has been calculated assuming a displaced Maxwellian distribution function. The calculated values of the real and imaginary parts of the conductivity are found to be in close agreement with the experimental results for both the parallel and perpendicular orientation of the microwave field. View full abstract»

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  • Dynamics of pulsed-microwave breakdown in a nonuniform field

    Publication Year: 1969, Page(s):21 - 23
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (445 KB)

    A waveguide-fed mica aperture was the site of breakdown. The development of breakdown was followed both in time and space. It was found that the initial stages of breakdown proceeded as expected; the final luminosity distribution, however, seems to suggest that the initial plasma configuration results in a drastic change in the Efield distribution across the aperture. View full abstract»

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  • Computer method of solving waveguide-iris problems

    Publication Year: 1969, Page(s):23 - 25
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (431 KB)

    A computational method of analysing an infinitely thin iris in a waveguide is described. Certain difficulties arise in the truncation of infinite series used in field representation, and these are illustrated with computed results. When these difficulties are overcome, good agreement with results derived by conventional techniques can be obtained. View full abstract»

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  • Measurement techniques in microstrip

    Publication Year: 1969, Page(s):25 - 26
    Cited by:  Papers (76)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (275 KB)

    A novel technique has been developed for measurement of dispersion and wavelength in microstrip transmission line laid down on an Al2O3 substrate. The frequency range so far investigated has been 4¿12GHz, although the method could be satisfactorily used at far higher frequencies. The measurement accuracy is better than within 1%. Techniques for producing well matched transitions to any thickness ... View full abstract»

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  • Microwave holograms and microwave reconstruction

    Publication Year: 1969, Page(s):26 - 28
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (709 KB)

    Microwave holographic reconstruction of the metal objects inside a purse was achieved by a nonscanning method. A microwave field was used for both constructing and reconstructing the holographic image. The visualisation of the microwave field was performed by both Polaroid and liquid-crystal techniques. The frequency used was 34.26GHz. View full abstract»

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  • Generation of multiple pseudorandom point processes from msequences

    Publication Year: 1969, Page(s):28 - 29
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (326 KB)

    This letter describes a compact source of multiple streams of pseudorandom events, with independently variable mean rates and small mutual crosscorrelations, based on two very long binary msequences. The interevent distributions are shown to be accurately geometric, and negative binomial processes generated from them are also satisfactory. View full abstract»

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  • Stabilisation of transferred-electron amplifiers with large n0L products

    Publication Year: 1969, Page(s):30 - 31
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (273 KB)

    The small-signal stability of a transferred-electron device (t.e.d.) driven with a voltage generator of finite impedance is discussed. It is shown that the series impedance significantly alters the stability condition. Computations for a resistor in series with the t.e.d. show that the maximum n0L product for stable operation increases with increasing series resistance. The practical implications ... View full abstract»

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  • Critical conductivity-length product for electromagnetic instability in negative-differential-conductivity media

    Publication Year: 1969, Page(s):31 - 32
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (282 KB)

    For a slab of uniform negative-differential-conductivity medium, such as nGaAs, it is shown that unstable plane electromagnetic waves may exist when the thickness exceeds a critical value determined by the product of differential conductivity and length. When the slab is terminated on both sides by vacuum, the critical |¿|L is found to be 2/377S. This instability explains the error in a paradoxic... View full abstract»

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  • Computation of eigenvalues for higher-order modes in a conical horn

    Publication Year: 1969
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (123 KB)

    A special expansion for the associated Legendre functions and their derivatives is employed to compute the integer eigenvalues for higher-order modes in a conical horn. The resulting plot of these eigenvalues, as a function of horn flare angle, is used to provide graphically the noninteger values corresponding to other flare angles of the horn. View full abstract»

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  • Input impedance of a short antenna in a warm plasma driven from a coaxial air line

    Publication Year: 1969, Page(s):33 - 35
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (361 KB)

    An approximation technique is used to calculate numerically the input impedance of a short antenna immersed in a warm plasma driven from a coaxial air line. The effect of the gap configuration is observed to be significant on the antenna reactance only. View full abstract»

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  • Parameter estimation using pseudorandom binary sequences

    Publication Year: 1969, Page(s):35 - 36
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    The instrumental-variable technique for parameter estimation is applied when the input is a pseudorandom binary sequence (p.r.b.s.). The instrumental variables proposed are time-weighted elements of a p.r.b.s., and this is shown to be equivalent to obtaining the mean value of several estimates obtained from noisy measurements. The estimates of the parameters are asymptotically unbiased. View full abstract»

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  • Self-pumped Gunn-effect parametric amplifier

    Publication Year: 1969, Page(s):36 - 37
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (287 KB)

    The letter reports the operation of a degenerate parametric amplifier which utilises the self-pumping action of the oscillating domain capacitance in the Gunn effect. Gains greater than 20dB at 5.98GHz have been obtained with the Gunn sample oscillating at 11.96GHz. Amplification is also reported in the normal negative-resistance mode, and an experiment is described which is designed to distinguis... View full abstract»

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Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

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Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White
Head of Photonics Research
University of Cambridge, UK