Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 4, Issue 15, 26 July 1968
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Volume 4, Issue 15
26 July 1968
Using the reciprocity theorem for antenna calculations
- Author(s): K.G. Balmain
- Source: Electronics Letters, Volume 4, Issue 15, p. 301 –302
- DOI: 10.1049/el:19680234
- Type: Article
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p.
301
–302
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The reciprocity theorem is used to derive expressions for the short-circuit current at the terminals of a receiving antenna and the input impedance of an antenna. The source-field Situations in the reciprocity statement are chosen so as to make the derivations straightforward to carry out and easy to interpret.
Ray tracing in the ionosphere
- Author(s): J. Shmoys
- Source: Electronics Letters, Volume 4, Issue 15, p. 302 –304
- DOI: 10.1049/el:19680235
- Type: Article
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p.
302
–304
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The advantages of calculating the ray-position co-ordinates and time delay parametrically in terms of the vertical component of the wave-number vector, for a plane stratified plasma, are pointed out. The results are applied to ray tracing near the Spitze.
Performance of laser-beam powered optically commutating motor
- Author(s): T.K. Ishii ; C. Kronenwetter ; S.V. Jaskolski ; A.P. Szews
- Source: Electronics Letters, Volume 4, Issue 15, p. 304 –305
- DOI: 10.1049/el:19680236
- Type: Article
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p.
304
–305
(2)
Optical motors were operated to demonstrate efficient energy transportation for mechanical use at a remote point, via optical waves. The laser beam showed that it can produce the same amount of mechanical power at a level of −30 dB over a distance 20–70 times greater than a focused collimated white-light beam.
Excess current in p–n junctions associated with surface states
- Author(s): D. Esteve
- Source: Electronics Letters, Volume 4, Issue 15, p. 305 –307
- DOI: 10.1049/el:19680237
- Type: Article
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p.
305
–307
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Surface effects are known to cause excess currents in p–n junctions. A quantitative model is proposed which shows that the essential contribution can be related to surface recombination velocity. An apparent exp (V/mUT) dependence is found for this current component.
Central-pin tolerances in broadband 3-port waveguide circulators
- Author(s): L.E. Davis
- Source: Electronics Letters, Volume 4, Issue 15, p. 307 –309
- DOI: 10.1049/el:19680238
- Type: Article
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p.
307
–309
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Computed designs for broadband 3-port waveguide designs are discussed. They require a central metallic pin of very small diameter within the ferrite. The computed effects of pin tolerances are shown.
Matrix method to determine shift-register connections for delayed pseudorandom binary sequences
- Author(s): B. Ireland and J.E. Marshall
- Source: Electronics Letters, Volume 4, Issue 15, p. 309 –310
- DOI: 10.1049/el:19680239
- Type: Article
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p.
309
–310
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A practical method is described to determine the modulo-2 feedback shift-register connections for producing advanced (or delayed) versions of a pseudorandom binary sequence.
Fundamental power/frequency limitations of microwave semiconductor devices
- Author(s): V.P. Kodali
- Source: Electronics Letters, Volume 4, Issue 15, p. 311 –312
- DOI: 10.1049/el:19680240
- Type: Article
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p.
311
–312
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The intrinsic frequency limitations on the power available from a class of microwave semiconductor devices, where charge-storage effects are present, are described.
Removal of mobile ions from the insulator layer of thin-film transistors
- Author(s): O.O. Turriff and J. Bradley
- Source: Electronics Letters, Volume 4, Issue 15, p. 312 –313
- DOI: 10.1049/el:19680241
- Type: Article
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312
–313
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Mobile ions can be removed from the insulator layer of t.f.t.s by the application of a Strong electrostatic field in a direction parallel to the plane of the substrate on which the devices are deposited.
Noise behaviour of the m.o.s.f.e.t. at v.h.f. and u.h.f.
- Author(s): A. Leupp and M.J.O. Strutt
- Source: Electronics Letters, Volume 4, Issue 15, p. 313 –314
- DOI: 10.1049/el:19680242
- Type: Article
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–314
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The optimum noise figures of an m.o.s.f.e.t. at u.h.f. and at pinch-off are calculated using a simplified equivalent circuit. The noise parameters are also determined experimentally. Theory and experiment are shown to be in good agreement. Noise parameters of the m.o.s.f.e.t. for the frequency range 0.1–0.8 GHz are given.
Cellular logical array for extracting square roots
- Author(s): K.J. Dean
- Source: Electronics Letters, Volume 4, Issue 15, p. 314 –315
- DOI: 10.1049/el:19680243
- Type: Article
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p.
314
–315
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An array of logical networks is described, the individual cells of which can be controlled so that their outputs either follow their primary input levels or act as subtractors between the primary input and that from an adjacent cell. The interconnections between cells in the array are so organised that the correct subtractions take place to extract the square root of the input binary number to the array.
Pulse gain and analogue-to-pulse conversion by Gunn diodes
- Author(s): S.H. Izadpanah and H.L. Hartnagel
- Source: Electronics Letters, Volume 4, Issue 15, p. 315 –316
- DOI: 10.1049/el:19680244
- Type: Article
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p.
315
–316
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20dB current gain and 9 dB power gain have been achieved for single-pulse operation with Gunn diodes in the resistive mode. A new analogue-to-pulse convertor is described. it is verified experimentally for six levels.
Sensitivity analysis in computer-aided design of linear circuits
- Author(s): T.B.M. Neill
- Source: Electronics Letters, Volume 4, Issue 15, p. 316 –317
- DOI: 10.1049/el:19680245
- Type: Article
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p.
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–317
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An approximate linear relation is established between the transfer function of a linear network and the component deviations. This can reduce the time consumed by a Monte Carlo sensitivity analysis. Little work is involved in evaluating the relationship beyond that already required for a conventional transient analysis.
Continuously variable microwave attenuation with Gunn-effect samples
- Author(s): H. Pollmann and B.G. Bosch
- Source: Electronics Letters, Volume 4, Issue 15, p. 317 –318
- DOI: 10.1049/el:19680246
- Type: Article
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p.
317
–318
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A continuously variable reflection-type microwave attenuator has been built using Gunn-effect samples. An attenuation of +20 to −5dB was obtained, negative values occurring when Gunn oscillations phase-locked to the injected signal. Microwave switching, as recently reported by Sugimoto and Sugiura, is a special operational mode of this attenuator.
Laser-beam modulation using grating diffraction effects
- Author(s): M. Dore
- Source: Electronics Letters, Volume 4, Issue 15, p. 318 –319
- DOI: 10.1049/el:19680247
- Type: Article
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p.
318
–319
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An alternative system for producing an electro-optic grating modulator is discussed. A polarisation grating is used to overcome electric-field reduction occurring with closely spaced electro-optic grating electrodes.
Time-axis expanding network
- Author(s): A.G.J. Holt and C. Nightingale
- Source: Electronics Letters, Volume 4, Issue 15, page: 319 –319
- DOI: 10.1049/el:19680248
- Type: Article
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p.
319
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It is shown that the operations of compressing and expanding a function of t along the time axis are linear. The operators are developed as series of differentials. The series are then realised by means of a transform similar to Mellin's transform.
Comments on 2-phase drag-cup accelerometer parameter determination
- Author(s): R.E. Burridge and G.N. Gupta
- Source: Electronics Letters, Volume 4, Issue 15, page: 320 –320
- DOI: 10.1049/el:19680249
- Type: Article
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p.
320
(1)
It is pointed out that a recently proposed method of determining sufficient parameters to describe the terminal performance of a drag-cup induction accelerometer suffers from implicit assumptions of doubtful validity which call into question the value of the method and the claims made for it.
State-variable synthesis of integrated-circuit distributed RC transfer functions
- Author(s): E.B. Kozemchak and R.W. Newcomb
- Source: Electronics Letters, Volume 4, Issue 15, p. 320 –321
- DOI: 10.1049/el:19680250
- Type: Article
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p.
320
–321
(2)
On combining the theory of canonical state-space equations with the theory of RC transmission lines, a means of designing distributed circuits for desired integrated-circuit transfer functions is given. The theory rests on a transformation of O'Shea, and is made practical by use of the approximation curves of Barron.
Stability of a class of nonlinear systems
- Author(s): M.S. Davies
- Source: Electronics Letters, Volume 4, Issue 15, page: 322 –322
- DOI: 10.1049/el:19680251
- Type: Article
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p.
322
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A graphical criterion for testing the absolute stability of a particular class of nonlinear systems is given. The system, which may involve a number of nonlinearities, is investigated using the Nyquist plot of its linear part.
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