Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 9, Issue 3, 8 February 1973
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Volume 9, Issue 3
8 February 1973
Some experimental results for a capacitively loaded V antenna
- Author(s): Momčilo B. Dragović ; Branko D. Popović ; Niels E. Jensen
- Source: Electronics Letters, Volume 9, Issue 3, p. 45 –46
- DOI: 10.1049/el:19730031
- Type: Article
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A V antenna with lumped capacitive loading is investigated experimentally. The loading is in the form of narrow transversal gaps along the antenna, which are progressively closer together towards the antenna ends. The antenna is found to exhibit remarkable broadband properties in admittance, and to have a more directive radiation pattern than a straight dipole with approximately similar loading.
Computer analysis of gradually tapered waveguide of arbitrary cross-sections
- Author(s): J.B. Davies ; O.J. Davies ; S.S. Saad
- Source: Electronics Letters, Volume 9, Issue 3, p. 46 –47
- DOI: 10.1049/el:19730032
- Type: Article
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Coupled-mode theory and numerical methods for solving uniform waveguides are combined to analyse the transition of a waveguide of slowly varying arbitrary cross-section. The technique has been applied to the design of the broadband Marié mode transducer. Theoretical and experimental results are given.
P.S.K. regenerator using phase-script logic
- Author(s): P.A. Watson and J. Hobdell
- Source: Electronics Letters, Volume 9, Issue 3, p. 47 –48
- DOI: 10.1049/el:19730033
- Type: Article
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Although phase-script logic has obvious drawbacks for present-day computer applications, it is suggested that such logic could be useful for signal processing in connection with phase-shift-keyed data or p.c.m. transmission systems. An example of a regenerative repeater is given which shows significant circuit simplification and possible cost reduction over conventional regenerators. A phase-script logic regenerator realised at a carrier frequency of 4.5 GHz has shown a capability of operating to at least 125 Mbits. Proportionally higher bit rates should be possible with an increase in carrier frequency.
Charge-coupled devices with submicron electrode separations
- Author(s): I.M. Baker ; J.D.E. Beynon ; M.A. Copeland
- Source: Electronics Letters, Volume 9, Issue 3, p. 48 –49
- DOI: 10.1049/el:19730034
- Type: Article
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A technique is described for fabricating a 2-phase charge-coupled structure in which the electrodes are separated by only 0.1–0.3 μm. Stringent photolithographic processing is not required for producing the submicron gaps.
Monolithic surface-acoustic-wave phase shifter
- Author(s): G. Chao
- Source: Electronics Letters, Volume 9, Issue 3, p. 49 –51
- DOI: 10.1049/el:19730035
- Type: Article
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A monolithic surface-acoustic-wave phase shifter is described. The device consists of a distributed Schottky-barrier varactor junction capable of varying the electrical boundary conditions seen by a surface acoustic wave propagating on a piezoelectric medium. Almost 180° of phase shift is achieved in 55 acoustic wavelengths of interaction region at 54 MHz.
Simple proof of the Simon-Mitter controllability theorem
- Author(s): T.R. Crossley and B. Porter
- Source: Electronics Letters, Volume 9, Issue 3, p. 51 –52
- DOI: 10.1049/el:19730036
- Type: Article
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It is shown that the introduction of generalised mode-controllability matrices of multivariable time-invariant linear systems greatly facilitates a simple and direct proof of the Simon–Mitter theorem concerning the controllability characteristics of such systems. This proof is presented for systems whose plant matrices have any Jordan canonical form.
F.E.T. theory of strip-coupled Rayleigh-wave amplifier
- Author(s): G.S. Kino
- Source: Electronics Letters, Volume 9, Issue 3, p. 52 –53
- DOI: 10.1049/el:19730037
- Type: Article
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It is shown that information can be transferred from one strip to another across a finite gap in which the carrier wave is subject to rapid decay. Each region in which a metal strip is located above the semiconductor, and insulated from it, is treated as an individual f.e.t. amplifier, exciting in the semiconductor a conduction current which flows into the adjacent similar region. Hence the carrier-wave decay between strips is unimportant. The effect of substituting ohmic contacts for the insulated ‘gates’ is discussed as an extension of this theory.
Realisation of transfer function with prescribed sensitivity function
- Author(s): F. Anday
- Source: Electronics Letters, Volume 9, Issue 3, p. 53 –54
- DOI: 10.1049/el:19730038
- Type: Article
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A flexible signal-flowgraph approach for the simultaneous realisation of transfer and sensitivity functions is presented. An example is given to illustrate the synthesis procedure.
Surface-wave correlator with inclined transducer
- Author(s): T.S. Fisher ; E. Patterson ; D.G. Scotter
- Source: Electronics Letters, Volume 9, Issue 3, page: 55 –55
- DOI: 10.1049/el:19730039
- Type: Article
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The use of an inclined output transducer with a 127-tap fixed-code correlator is described. The advantages of this layout for long correlators are shown to be increased tapping levels and a reduction in cumulative 2nd-order distortional effects.
Tensor-field interpretation of the dynamic behaviour of networks
- Author(s): D.J. Holding and F.J. Evans
- Source: Electronics Letters, Volume 9, Issue 3, p. 56 –57
- DOI: 10.1049/el:19730040
- Type: Article
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The matrix properties of network state equations are used to provide a tensor-field interpretation of dynamic behaviour, based on the existence of scalar- and vector-potential functions.
Quadratic performance measure for optimum design of linear systems
- Author(s): S. Das and B. Sarkar
- Source: Electronics Letters, Volume 9, Issue 3, p. 57 –59
- DOI: 10.1049/el:19730041
- Type: Article
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A method is presented for the evaluation of the integral of the square of the derivative of the error of time-invariant linear systems excited by deterministic inputs. The method is relatively simple in theory and is easy to compute. A performance measure, as a sum of the integral of the square of the error and the integral of the square of the derivative of the error, can be used effectively for the design of optimum linear systems. Depending on the number of integral terms used, the performance measure can be made quite flexible.
Measurement of admittance of Gunn diodes in passive and active regions of bias voltage
- Author(s): P.J. de Waard
- Source: Electronics Letters, Volume 9, Issue 3, p. 59 –60
- DOI: 10.1049/el:19730042
- Type: Article
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The transfer function of the microwave circuit to the diode chip is obtained for a Gunn diode by combining 10 GHz admittance measurements with the measurement of the low-frequency differential resistance, which is a function of the bias voltage. The transfer parameters thus found can be used to calculate the admittance of an oscillating diode.
Restriction on nonbinary commafree codes
- Author(s): I.S. Taylor and D.H. Green
- Source: Electronics Letters, Volume 9, Issue 3, p. 60 –61
- DOI: 10.1049/el:19730043
- Type: Article
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A challenging problem in coding theory is the selection of one word from each nondegenerate equivalence class to form a maximal-size commafree dictionary. The letter describes a new restriction which must be attached to a nonbinary commafree dictionary, if that dictionary is to attain maximum size.
Comments on ‘New measurement method of Gunn-diode impedance’
- Author(s): R. Charlton ; B.A.E. de Sa ; G.S. Hobson
- Source: Electronics Letters, Volume 9, Issue 3, p. 61 –63
- DOI: 10.1049/el:19730044
- Type: Article
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A discussion is given of processes which affect the estimation of the conductance/voltage relationships of transferred-electron oscillators from the start of oscillation conditions. It is concluded that the technique is likely to be unreliable, except in broad qualitative terms.
Scattering parameters of surface-wave multistrip directional couplers: a field approach
- Author(s): J. Bording and K.A. Ingebrigtsen
- Source: Electronics Letters, Volume 9, Issue 3, p. 63 –64
- DOI: 10.1049/el:19730045
- Type: Article
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A field solution for the acoustic-surface-wave modes in infinite arrays of metal strips is applied to multistrip directional couplers consisting of a finite number of strips. Particular emphasis is put on the behaviour close to resonance, where the period in the array is one halfwavelength of the acoustic surface wave. Experiments on an array of 120 strips show good agreement with the theory.
Computer optimisation of double-drift-region IMPATT diodes
- Author(s): Anders Lekholm and Josef Mayr
- Source: Electronics Letters, Volume 9, Issue 3, p. 64 –66
- DOI: 10.1049/el:19730046
- Type: Article
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Design parameters for double-drift-region silicon IMPATT diodes for frequencies from 10 to 100 GHz are presented. The design is based on extensive large-signal computer simulations at one frequency of two different diode structures in a simple circuit. From these simulations, a simple design criterion was derived which permits the calculation of optimised impurity profiles for any desired frequency, with a small computer effort.
Feed arrangement for axis definition of paraboloid reflector
- Author(s): S. Cornbleet
- Source: Electronics Letters, Volume 9, Issue 3, p. 66 –67
- DOI: 10.1049/el:19730047
- Type: Article
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An arrangement is proposed for the determination of the electrical axis of a paraboloid, utilising the effects of the subsidiary axial maxima that occur when the paraboloid is illuminated by a plane wave. By combining the signal received at the largest of these maxima with a sample taken from the main received signal in antiphase, a null detection system gives the location of the axis with high sensitivity. This is sufficient to enable the combination to be used to detect small distortions of the paraboloid, and as a precise axis-location device.
Realisation of operational-amplifier allpass networks
- Author(s): A.M. Soliman
- Source: Electronics Letters, Volume 9, Issue 3, p. 67 –68
- DOI: 10.1049/el:19730048
- Type: Article
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With the effect of the nonideal operational amplifier taken into consideration, it is shown that the differential-input configuration for realising allpass transfer characteristics is superior to the dual-input configuration.
More aspects of quantisation noise associated with digital coding of colour-television signals
- Author(s): L. Verhoeven
- Source: Electronics Letters, Volume 9, Issue 3, p. 69 –70
- DOI: 10.1049/el:19730049
- Type: Article
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An explanation is given for the origination of patterning effects in quantised colour-television pictures. The amplitude of the disturbance is calculated and related to CCIR protection ratios. The choice of a sampling frequency that is synchronised to the subcarrier frequency seems redundant for pulse-code-modulation coding systems with 8 bits per sample.
Economical RC active lossy ladder filters
- Author(s): J.M. Rollett
- Source: Electronics Letters, Volume 9, Issue 3, p. 70 –72
- DOI: 10.1049/el:19730050
- Type: Article
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The letter describes a class of RC active filters derived from RLC lossy ladder-filter prototypes. The presence of loss in the prototypes allows the use of active building blocks containing only one amplifier. Design methods are outlined, and ways of reducing sensitivity are discussed. The filters are economical in the number of amplifiers required, and a comparison indicates that they can be significantly less sensitive than active filters built as a cascade of non-interacting sections.
Erratum: Implementation of a moving-target indicator by bucket-brigade circuits
- Author(s): W.J. Butler ; C.M. Puckette ; M.B. Barron
- Source: Electronics Letters, Volume 9, Issue 3, page: 72 –72
- DOI: 10.1049/el:19730051
- Type: Article
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Erratum: Broadband bulk-wave cancellation in acoustic-surface-wave devices
- Author(s): R. Larosa and C.F. Vasile
- Source: Electronics Letters, Volume 9, Issue 3, page: 72 –72
- DOI: 10.1049/el:19730052
- Type: Article
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Erratum: Probability distribution of the crosscorrelation function of finite-duration single-bit random waveforms
- Author(s): J.B. Howard
- Source: Electronics Letters, Volume 9, Issue 3, page: 72 –72
- DOI: 10.1049/el:19730053
- Type: Article
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