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Electronics Letters

Issue 7 • Date September 1965

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Displaying Results 1 - 25 of 30
  • Resolution of X ray microscopy by hologram

    Publication Year: 1965, Page(s):181 - 182
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (263 KB)

    It is shown that, in the more recent forms of holography, the diameter of the reference point replaces the diameter of the source as a limit on the resolution. Unless a new way is found of reducing the diameter, previous estimates of the resolution (5000 Å, say) still apply. View full abstract»

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  • Measurement of small changes in resistance in the environment of a nuclear reactor

    Publication Year: 1965, Page(s):182 - 183
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (252 KB)

    A method is described for measuring small resistance changes in microminiature circuits while these are subjected to neutron irradiation from an atomic reactor. Sensitivities of a few parts per million have been achieved. View full abstract»

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  • Thin-wire loop antennas

    Publication Year: 1965, Page(s):183 - 184
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (229 KB)

    An experimental investigation on the impedance and radiation characteristics of thin-wire loop antennas is described. Impedance plots and radiation patterns are presented, showing a wide range of characteristic impedances and a capability of producing nearly isotropic radiation patterns. View full abstract»

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  • Riccati form of the wave equation

    Publication Year: 1965, Page(s):184 - 185
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (234 KB)

    The use of the Riccati form of the wave equation is discussed with reference to the reflection coefficients of atmospheric ayers. The basic principles are established for vertical incidence and can be readily extended to more general cases and analogous problems in other fields, including transmission-line and waveguide theory. View full abstract»

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  • Thermal drift of m.o.s. devices

    Publication Year: 1965, Page(s):185 - 186
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (302 KB)

    Experimental results concerning the temperature dependence of an m.o.s. field-effect transistor are presented. These results show a striking linear dependence of the temperature coefficient on the gate voltage. Comparison between experiment and simplified theory gives rise to many problems of validity of the theory. View full abstract»

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  • Dyadic Green's function for magnetic current source in compressible anisotropic plasma

    Publication Year: 1965, Page(s):186 - 187
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (326 KB)

    By making use of the recently formulated compressivity tensor for anisotropic and compressible media, the dyadic Green's function for a magnetic current source in such media is derived. A new dyadic operator is defined, which makes possible the expression of the Green's function in a concise form. View full abstract»

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  • Subjective quality of television pictures with multiple impairments

    Publication Year: 1965, Page(s):187 - 188
    Cited by:  Papers (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (348 KB)

    An empirical formula is proposed for predicting the subjective quality of television pictures degraded by two or more impairments simultaneously, given the quality grading for each impairment separately. The formula leads to a further proposal for transforming subjective-impairment magnitudes into summable impairment units termed `imps¿. View full abstract»

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  • Domain stability in the Gunn effect

    Publication Year: 1965, Page(s):189 - 190
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (244 KB)

    The present theoretical and experimental knowledge of the high-field domain in the Gunn effect gives conflicting result. The letter shows that these can be reconciled by a modification to the published reasoning about domain formation. View full abstract»

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  • Further notes on delayed versions of linear binary sequences

    Publication Year: 1965, Page(s):190 - 191
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (254 KB)

    Delayed versions of linear binary sequences can be generated by linear logic. The required logic may be determined by circuits which perform polynomial division, and this makes possible the sequential generation of all delayed versions. View full abstract»

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  • Production of p¿n junctions with bulk controlled characteristics

    Publication Year: 1965, Page(s):191 - 192
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (253 KB)

    Two methods of eliminating surface effects so that microplasma breakdown of p¿n junctions can be observed are described, and their limitations are discussed. The first, applicable to diffused junctions, increases the space-charge-layer width, while the second reduces the applied voltage at the periphery of alloyed structures. View full abstract»

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  • New calibration method for large aerial arrays

    Publication Year: 1965, Page(s):192 - 193
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (323 KB)

    A method for adjusting large multielement, aerial arrays is described. Calibrating signals are transmitted to the array elements in each direction in turn along a ring transmission line. With this procedure, gain and phase shift can be compared between elements without determining the length or attenuation of the calibration-signal feeder. View full abstract»

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  • Modes of propagation in a bounded compressible plasma

    Publication Year: 1965, Page(s):193 - 194
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (226 KB)

    The boundary condition which requires the vanishing of the normal component of electron velocity is shown to lead to results which are consistent with cold-plasma theory if the temperature is sufficiently low. This fact is demonstrated by examining the modes in a parallel-plate waveguide filled with compressible plasma. View full abstract»

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  • New frequency-discriminator circuit

    Publication Year: 1965, Page(s):194 - 195
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    This new frequency-discriminator circuit uses a single LC tuned circuit; setting up is minimal and the centre frequency is easily adjustable. The characteristic is linear for input-frequency deviations of 1% or more The maximum carrier frequency is limited to a few megacycles per second by the transistor feedback-amplifier techniques used. View full abstract»

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  • Far-field polar patterns of a surface-wave array at 20 Mc/s

    Publication Year: 1965, Page(s):195 - 196
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (241 KB)

    A large surface-wave interferometer array for the reception of long-range high-frequency signals has been described in the literature. The E and H plane polar patterns were measured initially by tethered-balloon methods at a range of 50 wavelengths. These results, which have been verified now by the use of an aircraft at a range of three miles, can explain the excellent operational performance of ... View full abstract»

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  • Multiwinding ideal transformers as multiport components

    Publication Year: 1965, Page(s):197 - 199
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (276 KB)

    It is known that a multiterminal or multiport component is fully characterised if its terminal graph and its terminal equations are given. In this letter the terminal representation of multiport ideal transformers is given. View full abstract»

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  • Proof of the Manley¿Rowe relations from quantum considerations

    Publication Year: 1965
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (146 KB)

    First Page of the Article
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  • A.C. response of a saturated ionisation chamber

    Publication Year: 1965, Page(s):199 - 200
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (279 KB)

    The small-signal impedance between the electrodes of an ionisation chamber is studied over a range of frequency and ionisation. The impedance is approximately that of an equivalent circuit which has one RC combination for each group of ions in the chamber. More accurate formulas are given. Experimental results support the theory. View full abstract»

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  • Field-strength measurements in resonant cavities by perturbation theory

    Publication Year: 1965, Page(s):200 - 201
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (298 KB)

    New theoretical aspects of Slater and Maier's method for field-strength measurements in resonant cavities, which is based on the resonance frequency shift caused by the insertion of small perturbing bodies, have been investigated. The possibility of using a small metallic ring is also considered. View full abstract»

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  • End-fire array of virtual acoustic sources produced by the interaction of cylindrically spreading acoustic waves

    Publication Year: 1965
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    An experimental study of the interaction between cylindrically spreading acoustic waves in water is described, and experimental results are given. The experimental results are compared with theoretical work separately published by one of the authors. View full abstract»

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  • Additions to the z transform table

    Publication Year: 1965, Page(s):202 - 203
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (317 KB)

    The ztransform method is a widely used tool for the analysis and synthesis of discrete systems. In this note a table of ztransform pairs when F(z) is an irrational function of z is given. The table is also useful for obtaining closed-form sums for some infinite series. View full abstract»

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  • New active RC synthesis procedure using negative-impedance convertors

    Publication Year: 1965, Page(s):203 - 204
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (277 KB)

    A new network configuration is introduced which may be used in active RC network synthesis. It uses a voltage-controlled voltage amplifier having negative gain equal to unity and a voltage- or current-inversion negative-impedance convertor. A synthesis procedure is eventually described using the new configuration. View full abstract»

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  • Selectivity of notch filters using nonuniform RC lines

    Publication Year: 1965, Page(s):204 - 206
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (419 KB)

    The notch selectivity of a notch filter is defined as the halfpower selectivity of a feedback amplifier with an open-loop gain of 40dB and the notch filter in its feedback circuit. Parameters of the exponential, the trigonometric, and the hyperbolic RC lines for different selectivities are given. View full abstract»

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  • Simple analogue divider and multiplier

    Publication Year: 1965
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (158 KB)

    A method is described for the simple multiplication and division of two variable voltages. The method utilises the fact that the ratio of the voltages across the components of two identical RC circuits is a constant which is independent of the full voltages applied across the circuits. View full abstract»

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  • Derivation of n-ports with prescribed insertion-loss characteristics from known two-ports

    Publication Year: 1965, Page(s):206 - 207
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (286 KB)

    Simple procedures are presented for finding an n-port, and/or its immittance matrixes, having the same insertion-loss characteristics between every pair of ports, when a realisation is known for n = 2. Various types of symmetry are also defined for n-ports. View full abstract»

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  • Excitation of surface modes along a semi-infinite dielectric cylinder

    Publication Year: 1965, Page(s):208 - 209
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (345 KB)

    Expressions for the amplitude and power of surface-waveguide modes excited by a plane wave along a semi-infinite dielectric cylinder are presented. Approximations for small dielectric differences are given, which result in a simple expression for the power of the modes. Application of these results to light propagating along the human retinal receptors is discussed. View full abstract»

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Aims & Scope

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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Meet Our Editors

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