Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 9, Issue 11, 31 May 1973
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Volume 9, Issue 11
31 May 1973
Piezoelectric coupling parameter Δν/ν for acoustic surface waves in a layered CdSe-on-yz-cut-LiNbO3 structure
- Author(s): E. Voges and J. Angerstein
- Source: Electronics Letters, Volume 9, Issue 11, p. 241 –242
- DOI: 10.1049/el:19730174
- Type: Article
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The piezoelectric coupling parameter Δv/v has been determined at 100 MHz by measuring the change in velocity for a metallised interface in a CdSe-on-yz-cut-LiNbO3 structure. An initial increase of Δν/ν from 2.5×10−2 at kh = 0 to 2.9×10−2 at a normalised layer thickness kh≃0.5 has been observed, in agreement with theory.
Integral finite-element approach for solving the Laplace equation
- Author(s): B.H. McDonald ; M. Friedman ; M. Decreton ; A. Wexler
- Source: Electronics Letters, Volume 9, Issue 11, p. 242 –244
- DOI: 10.1049/el:19730175
- Type: Article
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So far, numerical methods for solving the Laplace equation have consisted mainly of either a finite-difference or a variational finite-element scheme. The variational approach, however, always dealt with a positive-definite differential operator −∇2. In this letter, a new integral method for solution is suggested. The differential problem is transferred into an integral equation with a kernel that defines a positive-definite operator. Then, by the Ritz method,1 the solution is given as the limit of a converging sequence of approximations. Two examples are presented: a boundary-value problem for which there is an exact solution, and the square parallel-plate capacitor fundamental in the study of microstrip-line propagation.
Q band (38 GHz) varactor-tuned Gunn oscillators
- Author(s): B.J. Downing and F.A. Myers
- Source: Electronics Letters, Volume 9, Issue 11, p. 244 –245
- DOI: 10.1049/el:19730176
- Type: Article
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Broadband varactor-tuned Gunn oscillators for Q band operation have been designed. One version using a reduced-height waveguide cavity has an electronic bandwidth of 1.18 GHz. Another using a coaxial cavity has a bandwidth of 3.05 GHz.
Microwave-package measurements at the Q band
- Author(s): B.J. Downing and P.N. Robson
- Source: Electronics Letters, Volume 9, Issue 11, p. 245 –246
- DOI: 10.1049/el:19730177
- Type: Article
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The elements of the π equivalent circuit of S4 microwave packages with a range of bond-lead geometries have been measured at the Q band.
Frequency-selective scanning of acoustic surface wave
- Author(s): P. Hartemann
- Source: Electronics Letters, Volume 9, Issue 11, p. 246 –247
- DOI: 10.1049/el:19730178
- Type: Article
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An acoustic-surface-wave point source is obtained when an interdigital transducer with concentric curved fingers is used. An array transducer composed of 80 point sources has been tested. The direction of propagation of the surface-wave beam emitted by this transducer depends on the frequency. A transmitting-array transducer and five receiving transducers are deposited on a quartz substrate. Each of these five outputs corresponds to a given frequency and delay prescribed by the positioning. At 12°, scanning was attained for a frequency variation of 7.6 MHz around a central frequency of about 60 MHz, corresponding to a delay variation of 18.2 μs.
Behaviour of burst noise under mechanical stress
- Author(s): T. Rodríguez ; J. Mulet ; A. Luque
- Source: Electronics Letters, Volume 9, Issue 11, p. 248 –249
- DOI: 10.1049/el:19730179
- Type: Article
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Measurements of the amplitude and statistical parameters of burst noise when a transistor is subjected to external mechanical stress are presented. The parameters measured are the number of bursts per second and the average duration of the burst and no-burst states.
Choice of parameters for calculating loudness ratings of telephone speech paths
- Author(s): D.L. Richards
- Source: Electronics Letters, Volume 9, Issue 11, p. 249 –251
- DOI: 10.1049/el:19730180
- Type: Article
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Loudness ratings and reference equivalents of telephone speech paths can be calculated according to well established principles, but different authors have used different values for the parameters of the model. Comparisons are made between ratings based on five different sets of values using three different reference systems.
Single-mode resonance in LiNbO3 for filter design
- Author(s): J.W. Burgess ; M.C. Hales ; F.W. Ainger ; R.J. Porter
- Source: Electronics Letters, Volume 9, Issue 11, p. 251 –252
- DOI: 10.1049/el:19730181
- Type: Article
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The close relationship between the crystal symmetry and vibrational properties of a material is utilised in the design of broadband monolithic high-frequency crystal filters. Using a pseudo-3-fold-symmetry direction in LiNbO3, plate resonators with a single-mode resonance have been constructed.
Comment on ‘Metal-nitride–oxide–silicon avalanche-injection memory’
- Author(s): P.J.T. Mellor and P.J. Dunn
- Source: Electronics Letters, Volume 9, Issue 11, p. 252 –253
- DOI: 10.1049/el:19730182
- Type: Article
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Spreading resistance of multiple-layer cylindrical structures
- Author(s): P. Brook and J.G. Smith
- Source: Electronics Letters, Volume 9, Issue 11, p. 253 –254
- DOI: 10.1049/el:19730183
- Type: Article
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The potential distributions and spreading resistances of multiple-layer cylindrical structures are analysed. Computed results are compared with the measured thermal impedance of a practical heatsink.
Insertion loss and saturation effects in the diode correlator
- Author(s): T.M. Reeder
- Source: Electronics Letters, Volume 9, Issue 11, p. 254 –256
- DOI: 10.1049/el:19730184
- Type: Article
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The insertion loss and electronic saturation effects observed in the series-configuration diode correlator are described in terms of a simple 1st-order theory. The results of this theory are favourably compared with experiments for an 8-tap diode correlator operating in the 30–60 MHz range.
Signal/noise ratio in rectangular-wave modulation
- Author(s): J.N. Tripathi
- Source: Electronics Letters, Volume 9, Issue 11, p. 256 –257
- DOI: 10.1049/el:19730185
- Type: Article
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It is shown here that the earlier formula for the calculation of the signal/channel-noise ratio (s.c.n.r.) in rectangular-wave modulation is not correct. According to the new result, the s.c.n.r. is not proportional to the cube of the channel bandwidth; instead it closely approximates to the s.c.n.r. expression for pulse-length modulation.
Numerical computation of the current distribution and far-field-radiation pattern of the axial-mode helical aerial
- Author(s): J.A.C. Hugh
- Source: Electronics Letters, Volume 9, Issue 11, p. 257 –258
- DOI: 10.1049/el:19730186
- Type: Article
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The accepted model of the endfire helical aerial is examined, and the current distribution and radiation pattern are derived numerically. It is shown that the model is not adequate, and alternatives are proposed and examined.
Dependence of conduction current in polythene on specimen thickness
- Author(s): R. Cooper ; B.R. Varlow ; J.P. White
- Source: Electronics Letters, Volume 9, Issue 11, p. 259 –260
- DOI: 10.1049/el:19730187
- Type: Article
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The quasisteady-conduction-current density in polythene film at room temperature has been measured with the applied stress varying between about 0.1 MV/cm and 1.2 MV/cm and with film thicknesses between 25 μm and 200 μm. The current density at constant applied stress was found to be independent of the specimen thickness. It is also shown that the conductivity of polythene film can be greatly increased, and its electric strength appreciably reduced, by an oxidation treatment that produces carbonyl and nitrogroups in the molecular chains.
Erratum: Twisted nematic liquid-crystal electro-optic devices with areas of reverse twist
- Author(s): E.P. Raynes
- Source: Electronics Letters, Volume 9, Issue 11, page: 260 –260
- DOI: 10.1049/el:19730188
- Type: Article
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Erratum: Zero-steering antenna system for receiving a signal close to the direction of strong interference
- Author(s): D.C. Cooper
- Source: Electronics Letters, Volume 9, Issue 11, page: 260 –260
- DOI: 10.1049/el:19730189
- Type: Article
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