Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 8, Issue 11, 1 June 1972
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Volume 8, Issue 11
1 June 1972
Fourier-subtractive holographic imaging of microwave-antenna apertures
- Author(s): A.P. Anderson ; J.C. Bennett ; P.A. Mcinnes
- Source: Electronics Letters, Volume 8, Issue 11, p. 277 –278
- DOI: 10.1049/el:19720203
- Type: Article
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p.
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–278
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A Fourier-subtractive holographic technique has been applied to the imaging of microwave antenna apertures. By generating computed holograms, this approach is shown to reveal other-wise unresolved features.
Characteristics of high-contrast bromide-sodalite storage displays with selective erasure
- Author(s): H.C.A. Hankins ; R. Procter ; G. Hughes
- Source: Electronics Letters, Volume 8, Issue 11, p. 278 –280
- DOI: 10.1049/el:19720204
- Type: Article
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p.
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–280
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For interactive computer graphics, high-contrast storage displays with selective erasure are desirable. In this letter, a high-contrast storage display is proposed, using a bromide-sodalite phosphor in the thermal-erase mode. In this mode, the writing area is coloured completely, and visual images are obtained by selective thermal erasure of the coloured area using the electron beam at a higher excitation level. Selective diagram erasure is obtained by recolouring the required written areas on the display diagram.
Phase characteristics of microwave avalanche-diode amplifiers
- Author(s): G.B. Morgan and K.C. Siow
- Source: Electronics Letters, Volume 8, Issue 11, p. 280 –281
- DOI: 10.1049/el:19720205
- Type: Article
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p.
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–281
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The phase and gain characteristics of wideband, coaxial X band avalanche-diode amplifiers have been determined, and typical data are presented for an 11 GHz amplifier. At a gain of 15 dB, the phase linearity was less than 4°, the a.m.-p.m. conversion was less than 8 deg/dB and the phase sensitivity to current was about 0.2 deg/mA.
Stability circle criterion with spatial harmonic linearisation for nonlinear distributed-parameter systems
- Author(s): Guy Jumarie
- Source: Electronics Letters, Volume 8, Issue 11, p. 281 –282
- DOI: 10.1049/el:19720206
- Type: Article
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p.
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–282
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A 1-dimensional, 1-distributed-parameter nonlinear system which exhibits a structure similar to that of the standard nonlinear control loop with lumped-parameter elements, is considered from the viewpoint of its input-output stability. An approached stability circle criterion, available in the context of a linearisation with respect to the distributed parameter, is stated.
International comparison of coaxial power standards at 3.030 GHz
- Author(s): R. Bostroem and A.E. Fantom
- Source: Electronics Letters, Volume 8, Issue 11, page: 283 –283
- DOI: 10.1049/el:19720207
- Type: Article
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A comparison of power-measurement standards at 3.030 GHz carried out between the National Physical Laboratory, England, and the Research Institute of National Defence, Sweden, gave agreement to within 0.07%.
Rainfall crosspolarisation of linearly and circularly polarised waves at microwave frequencies
- Author(s): P.A. Watson and M. Arbabi
- Source: Electronics Letters, Volume 8, Issue 11, p. 283 –285
- DOI: 10.1049/el:19720208
- Type: Article
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–285
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The isolation between right- and left-hand circularly polarised plane waves is evaluated and compared with that between orthogonal linear plane waves for propagation through rain with nonspherical drops. It is seen that the linear orthogonal mode of propagation will give superior isolation when a distribution of raindrop canting angles is considered.
Class of optimal damage-resistant communication nets
- Author(s): B.R. Myers
- Source: Electronics Letters, Volume 8, Issue 11, p. 285 –286
- DOI: 10.1049/el:19720209
- Type: Article
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–286
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It is shown that the product Kn×Kn of the complete graph Kn with itself is an optimal damage-resistant net in the Boesch and Thomas sense, i.e. Kn×Kn is optimally invulnerable to disconnection by either vertex or line removal.
Level-shift compensation in m.o.s. bucket-brigade circuits operated in an analogue mode
- Author(s): W.J. Butler ; M.B. Barron ; B. Kurz
- Source: Electronics Letters, Volume 8, Issue 11, p. 286 –287
- DOI: 10.1049/el:19720210
- Type: Article
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p.
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–287
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As a result of net loss (or gain) of charge to the substrate, the signal component at the output of a bucket-brigade circuit is subject to a direct-voltage shift which reduces the dynamic range of the device. Compensation for such level-shifting (of either polarity) can be provided by means of single additional m.o.s. devices placed at suitable intervals along the delay line.
Stability properties of some RC active realisations
- Author(s): W.B. Mikhael and B.B. Bhattacharyya
- Source: Electronics Letters, Volume 8, Issue 11, p. 288 –289
- DOI: 10.1049/el:19720211
- Type: Article
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p.
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–289
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Some stability properties of a recently reported minimal-capacitor low-sensitivity RC active realisation of voltage transfer functions are investigated. It is shown that the realisation can attain a low-frequency unstable mode of operation. Five new circuits are derived from the original, using the theory of singular elements. Only two of these circuits are shown to be free from low-frequency unstable modes. The two new stable structures retain all the attractive features of the original realisation.
Temperature-independent low-voltage wide-bandwidth optical modulators
- Author(s): G.M.S. Joynes ; M.A.G. Clark ; Q.V. Davis
- Source: Electronics Letters, Volume 8, Issue 11, p. 289 –290
- DOI: 10.1049/el:19720212
- Type: Article
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p.
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–290
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Temperature-independent electro-optic modulators have been constructed using lithium niobate. A frequency response extending to 2 GHz has been achieved with a relatively low drive power. The modulators have been used with a 0.63 μm laser and are easily aligned on a standard optical bench.
Fusion junctions for glass-fibre waveguides
- Author(s): R.B. Dyott ; J.R. Stern ; J.H. Stewart
- Source: Electronics Letters, Volume 8, Issue 11, p. 290 –292
- DOI: 10.1049/el:19720213
- Type: Article
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–292
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Various ways of making fused joints in a monomode glass-fibre waveguide have been tried. The highest efficiencies have been about 80%, with a joint in which the end faces are lightly fused together after the cores have been aligned for optimum transmission.
Absorption mode for e.l.f. electromagnetic propagation in the Earth-crust waveguide
- Author(s): James R. Wait
- Source: Electronics Letters, Volume 8, Issue 11, p. 292 –294
- DOI: 10.1049/el:19720214
- Type: Article
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p.
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–294
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Using a highly idealised 3-layer model of the Earth's crust, it is shown that the modes of propagation fall into two classes. The conventional type leads to attenuation rates greater than the intrinsic attenuation rate for plane waves in the medium of lowest conductivity. The other type of solution leads to attenuation rates that are anomalously low. It is shown that this mode of propagation corresponds to a condition of complete absorption of an inhomogeneous plane wave incident from below the waveguide. To excite this absorption mode, we would need an aperture of infinite extent!
Transient magnetic fields produced by a step-function-excited loop buried in the earth
- Author(s): James R. Wait and David A. Hill
- Source: Electronics Letters, Volume 8, Issue 11, p. 294 –295
- DOI: 10.1049/el:19720215
- Type: Article
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Using a previously developed formalism, we obtain explicit results for the field waveforms observed on the Earth's surface for a small horizontal loop buried in a conducting halfspace. It is shown that the shape of the waveform is diagnostic of the relative location of the buried source. The results have possible application in mine rescue operations.
Absorption rates of u.l.f. modes guided in the Earth's crust
- Author(s): H.T. Chang ; R.K. Cross ; M.D. Grossi ; J.V. Harrington
- Source: Electronics Letters, Volume 8, Issue 11, p. 295 –296
- DOI: 10.1049/el:19720216
- Type: Article
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The Earth-crust waveguide is a propagation medium of potential usefulness in long-range, low-data-rate u.l.f. communication. Absorption rates for u.l.f. proper modes guided by this stratification are quite low (as opposed to what happens at higher frequencies such as v.l.f. and e.l.f.), even with a conductivity of 10−5 S/m in the guiding duct. Improper modes, if a way could be found to excite them with a finite-aperture source, would be characterised by comparable absorption rates with a conductivity in the duct as high as 10−4 S/m.
Erratum: Dielectric loading of corrugated waveguides
- Author(s): M.J. Al-Hakkak
- Source: Electronics Letters, Volume 8, Issue 11, page: 296 –296
- DOI: 10.1049/el:19720217
- Type: Article
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Erratum: Emitter-current-limited injection in negative-mobility semiconductors in the limit of zero doping
- Author(s): D. Dascalu
- Source: Electronics Letters, Volume 8, Issue 11, page: 296 –296
- DOI: 10.1049/el:19720218
- Type: Article
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