Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 1, 10 January 1974
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Volume 10, Issue 1
10 January 1974
Dielectric waveguides for millimetre-wavelength transmission
- Author(s): P.J.B. Clarricoats ; A.D. Olver ; A.M.B. Al-Hariri
- Source: Electronics Letters, Volume 10, Issue 1, p. 1 –2
- DOI: 10.1049/el:19740001
- Type: Article
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The letter describes the salient features of a parametric study of dielectric waveguides intended for millimetre-wavelength microwave transmission. The waveguide is an analogue of the monomode optical waveguide, and, if core and cladding are made from foam materials, with loss tangents of order 10−5, the HE11 mode attenuation is about 40 dB/km, and the group delay change is 0.35 ns/km over 1 GHz bandwidth centred at 40 GHz.
Optical characteristics of twisted nematic liquid-crystal films
- Author(s): C.H. Gooch and H.A. Tarry
- Source: Electronics Letters, Volume 10, Issue 1, p. 2 –4
- DOI: 10.1049/el:19740002
- Type: Article
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A twisted nematic liquid crystal is shown by theory and experiment to rotate incident plane-polarised light by π/2 only at specified wavelengths. At other wavelengths, elliptically polarised light is produced. This action determines the contrast ratio of some twisted nematic devices.
Further comments on t.i.r. deflector/modulator performance
- Author(s): M.T.V. Scibor-Rylski
- Source: Electronics Letters, Volume 10, Issue 1, p. 4 –6
- DOI: 10.1049/el:19740003
- Type: Article
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T.I.R. modulator/deflector far-field order intensities are shown to agree with prediction for LiNbO3xy-cut devices, and a ‘blazing’ effect, controlled by crystal orientation, is suggested. Zero-order extinction ratios were between 40:1 and 140:1, and seemed optical-finish limited. Misalignment of a 0.1 mm pitch interdigitated electrode device by ±5° halved the device sensitivity, indicating the possibility of use with uncollimated light. White-light (incoherent) operation and optimisation prospects are reported.
Approximate formula for surface carrier concentration in charge-coupled devices
- Author(s): D.G. Ong and R.F. Pierret
- Source: Electronics Letters, Volume 10, Issue 1, p. 6 –7
- DOI: 10.1049/el:19740004
- Type: Article
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A closed-form approximate formula is developed that conveniently relates the surface volume concentration of the signal charge in a c.c.d. element to externally specified system variables. The approximation error is exhibited to be less than 1% for a typical set of device parameters.
GaAs 50 GHz Schottky-barrier IMPATT diodes
- Author(s): T. Watanabe ; H. Kodera ; M. Migitaka
- Source: Electronics Letters, Volume 10, Issue 1, p. 7 –8
- DOI: 10.1049/el:19740005
- Type: Article
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Technological improvements have been made to realise high-efficiency GaAs Schottky-barrier IMPATT diodes in the 50 GHz band. Efficiency and output power have been increased by a factor of 1.5 over previous best results. Efficiency as high as 11.0% at 51 GHz and an output power of 420 mW at 53 GHz have been obtained.
Asynchronous sequential machines with request/acknowledge operating mode
- Author(s): M. Courvoisier and P. Azema
- Source: Electronics Letters, Volume 10, Issue 1, p. 8 –10
- DOI: 10.1049/el:19740006
- Type: Article
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A method for the synthesis of asynchronous sequential machines that leads to a realisation directly obtained from the flow graph (or flow table) is described. Each state of the system is materialised with a memory element designed in such a way that the state transitions operate in a request/acknowledge mode. The consequences are that the sequential network is hazard free and only the input transfer functions need to be generated.
Optimisation of mine winder: state-constrained minimum-energy problem
- Author(s): D.H. Owens and J.B. Edwards
- Source: Electronics Letters, Volume 10, Issue 1, p. 10 –11
- DOI: 10.1049/el:19740007
- Type: Article
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In the application of modern control theory to mining processes, the optimal control of winding engines has recently been investigated. This letter sets the problem in a general context, and derives the optimal minimum-energy controller when the system is subject to hard state constraints on the midshaft speed.
Bending losses of multimode optical fibres
- Author(s): A.W. Snyder and D.J. Mitchell
- Source: Electronics Letters, Volume 10, Issue 1, p. 11 –12
- DOI: 10.1049/el:19740008
- Type: Article
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The bending loss of rays within circular and slab multimode optical waveguides is determined using only Snell's laws, the generalised Fresnel transmission coefficient and the Goos-Haenchen shift. The generalised transmission coefficient accounts for radiation losses, due to curvature, not included in Fresnel's classical laws.
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