Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 3, 7 February 1974
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Volume 10, Issue 3
7 February 1974
Dyadic modification to sequential technique for multivariable-control-systems design
- Author(s): D.H. Owens
- Source: Electronics Letters, Volume 10, Issue 3, p. 25 –26
- DOI: 10.1049/el:19740019
- Type: Article
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–26
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A technique is suggested for easing the loop-ordering difficulty inherent in Mayne's sequential method for multi-variable-feedback-control-system design, by combining the concept of loop addition with that of dyadic approximation. It is shown that, if the plant matrix is dyadic, the problem is completely removed.
Mathematical model with minimum number of independent coefficients for transistors for high frequencies
- Author(s): E. Faldella and G. Iuculano
- Source: Electronics Letters, Volume 10, Issue 3, p. 26 –27
- DOI: 10.1049/el:19740020
- Type: Article
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A stepwise procedure is described to select the independent coefficients when forming a mathematical model of transistors for high frequencies. The basic idea is to determine the least-squares estimates of the coefficients from the measured scattering parameters S in a group of transistors of the same type. Examination of the correlation matrix of these estimates enables one to accept, in turn, the independent coefficient that has no linear relationship with the preceding ones already selected as independent.
High-efficiency microwave oscillations that use new 4-layer structure
- Author(s): B. Culshaw and R.A. Giblin
- Source: Electronics Letters, Volume 10, Issue 3, p. 27 –29
- DOI: 10.1049/el:19740021
- Type: Article
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There have been numerous reports on the practical limitations of conventional p+-n-n+ avalanche diodes. These reports conclude that large-signal power saturation occurs at about 35% voltage modulation in silicon and at a somewhat higher level in gallium arsenide. This power saturation can, to a large extent, be attributed to the losses incurred in the diode, owing to the effective series resistance of unswept epitaxial material, an effect that necessarily occurs at large voltage swings. This depletion-layer modulation also gives rise to detrimental parametric effects under large-signal conditions. The letter briefly reviews the prime causes of this power saturation, and explains how voltage modulation in excess of 75% may be obtained, without any depletion-layer modulation, by using a 4-layer structure. Conversion efficiencies exceeding 55% can be obtained, while retaining the advantages of the p+-n-n+ structure.
Decreasing f.m. noise in absorption e.p.r. spectrometer
- Author(s): G.C.M. Meijer
- Source: Electronics Letters, Volume 10, Issue 3, p. 29 –30
- DOI: 10.1049/el:19740022
- Type: Article
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At high incident cavity power, the main noise source in e.p.r. spectrometers is microwave-source f.m. noise. In the letter, a simple and efficient method to decrease this noise is introduced.
Some examples demonstrating feasibility of evolutionary approach to linear-network synthesis
- Author(s): O.P.D. Cutteridge and P.H. di Mambro
- Source: Electronics Letters, Volume 10, Issue 3, p. 30 –31
- DOI: 10.1049/el:19740023
- Type: Article
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An initial study has been carried out to determine the feasibility of using network evolution as a computer synthesis method for linear networks. The procedure employed uses numerical optimisation in conjunction with coefficient matching, and is applied to 3-terminal RC networks containing two internal nodes. An example showing the successful development of a parallel-T realisation from an initial ladder structure is described in detail.
Some new results on binary linear block codes
- Author(s): A.A. Hashim and A.G. Constantinides
- Source: Electronics Letters, Volume 10, Issue 3, p. 31 –33
- DOI: 10.1049/el:19740024
- Type: Article
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Certain properties of the parity-check matrix H of (n, k) linear codes are used to establish a computerised search procedure for new binary linear codes. Of the new error-correcting codes found by this procedure, two codes were capable of correcting up to two errors, three codes up to three errors, four codes up to four errors and one code up to five errors. Two meet the lower bound given by Helgert and Stinaff, and seven codes exceed it. In addition, one meets the upper bound. Of the even-Hamming-distance versions of these codes, eight meet the upper bound, and the remaining two exceed the lower bound.
Radiation patterns of pyramidal dielectric waveguides
- Author(s): N. Brooking ; P.J.B. Clarricoats ; A.D. Olver
- Source: Electronics Letters, Volume 10, Issue 3, p. 33 –34
- DOI: 10.1049/el:19740025
- Type: Article
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The radiation patterns of pyramidal dielectric waveguides excited by pyramidal metallic horns are predicted and compared with patterns measured at 9 GHz. Satisfactory agreement is obtained, especially in the region of the main beam. At wide angles, the pattern corresponds quite closely to that of the launcher alone.
Exact synthesis of active lowpass frequency-dependent negative-resistance filters
- Author(s): C. Nightingale and J.M. Rollett
- Source: Electronics Letters, Volume 10, Issue 3, p. 34 –35
- DOI: 10.1049/el:19740026
- Type: Article
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If resistances shunting the terminating capacitors of an active lowpass frequency-dependent negative-resistance (f.d.n.r.) filter are used to provide a d.c. path to the amplifier inputs, a redundant pole-zero pair is introduced. A method is described for designing such a filter so that the pole and zero coincide, and the filter exactly realises the desired transfer function.
Thermodynamic theory of telecommunication
- Author(s): J. Głowacki
- Source: Electronics Letters, Volume 10, Issue 3, p. 35 –36
- DOI: 10.1049/el:19740027
- Type: Article
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A very simple thermodynamic model, based on Gibbs's ensembles, of telephone traffic is presented.
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