Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 13, Issue 13, 23 June 1977
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Volume 13, Issue 13
23 June 1977
Antenna measurements on an intermediate distance range by using an interference-pattern technique
- Author(s): K.M. Keen
- Source: Electronics Letters, Volume 13, Issue 13, p. 375 –376
- DOI: 10.1049/el:19770272
- Type: Article
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p.
375
–376
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Far-field antenna-pattern measurements have been made by using a recently proposed intermediate-distance technique, whereby phase information is extracted from interference patterns. A comparison between these and radiation patterns obtained on a conventional far-field range demonstrates the viability of the measurement method.
Prediction of microwave slant-path attenuation from point rainfall-rate measurements
- Author(s): J.E. Allnutt
- Source: Electronics Letters, Volume 13, Issue 13, p. 376 –378
- DOI: 10.1049/el:19770273
- Type: Article
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p.
376
–378
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An experiment is described in which a rapid-response (10 s) raingauge was operated for 3 years with an 11.6 GHz radiometer directed along an inclined radio path such as might be used with a communications satellite. Cumulative statistics of the path attenuation due to rain are computed from the radiometer results and compared with cumulative rainfall-rate statistics for each of the 3-year periods. The spread between successive years is considered to be small enough for reliable predictions of attenuation to be made from the raingauge results. The application to data obtained from slower-response raingauges is considered.
Influence of a central depression on the dispersion characteristics of a graded-index profile
- Author(s): P.F. Checcacci ; R. Falciai ; A.M. Scheggi
- Source: Electronics Letters, Volume 13, Issue 13, p. 378 –379
- DOI: 10.1049/el:19770274
- Type: Article
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p.
378
–379
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Ray-tracing techniques and modal relations are utilised for evaluating the dispersion characteristics of multimode fibres with a quasiparabolic profile having a central depression. The results show that the dispersion increases with the dimensions of the depression; however, such an increase may be negligible if the dimensions of the depression approach those corresponding to realistic preforms produced by the c.v.d. technique.
Observations of high-field domains in GaxIn1 − xSb Gunn diodes
- Author(s): Mitsuo Kawashima ; Kimihiro Ohta ; Shoei Kataoka
- Source: Electronics Letters, Volume 13, Issue 13, p. 379 –381
- DOI: 10.1049/el:19770275
- Type: Article
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p.
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–381
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The properties of high-field domains in GaxIn1-xSb Gunn diodes (0.4 < x < 0.82) have been studied by measuring the surface potential on the diodes. The domain velocities vary with the Ga composition x, 5.3–6.1×106 cm/s for0.8 > x > 0.55 and 10×106 cm/s for x = 0.4, but they are almost independent of the applied voltage, even if the electron concentration is increased by the impact ionisation in the domain at high applied voltages for the small-x samples.
Accurate broadband square-to-triangle convertor
- Author(s): S.F. Carter and E.A. Faulkner
- Source: Electronics Letters, Volume 13, Issue 13, p. 381 –382
- DOI: 10.1049/el:19770276
- Type: Article
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p.
381
–382
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The convertor has been used to generate a sinusoid, in conjunction with a piece-wise linear network. A bandwidth of 105 Hz has been obtained; distortion is typically 0.2% over the frequency range 2 Hz–25 kHz.
New v-groove integrated injection logic
- Author(s): S.-Y. Yu
- Source: Electronics Letters, Volume 13, Issue 13, p. 382 –383
- DOI: 10.1049/el:19770277
- Type: Article
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p.
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–383
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A new V-groove integrated injection logic (v.i.i.l.) is proposed which combines the V-groove technology and the double-diffused bipolar technology. The fabrication processes arc qualitatively described. The lateral p–n–p transistor of the i.i.l. is located on the vertical V-shape surface, and the effective base width is controlled by the combination of the vertical diffusion process and the V-groove etching rate. A 1-dimensional analysis is used and an approximate expression for the collector current of the lateral p–n–p transistor is given. The v.i.i.l. is expected to have a higher production yield than that of the ordinary i.i.l.
Unidirectional surface-acoustic-wave transducers with a ZnO film on glass substrate
- Author(s): Y. Shimizu and T. Hata
- Source: Electronics Letters, Volume 13, Issue 13, page: 384 –384
- DOI: 10.1049/el:19770278
- Type: Article
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A unidirectional surface-acoustic-wave transducer with a sputtered ZnO film on a glass substrate is presented, consisting of interdigital electrodes and a plate electrode on both sides of the film. Experiments are in good agreement with the equivalent-network approach, which is similar to Smith's networks for the normal interdigital transducer.
Method for designing stable 2-D digital filters
- Author(s): K.P. Prasad and P.S. Reddy
- Source: Electronics Letters, Volume 13, Issue 13, p. 385 –386
- DOI: 10.1049/el:19770279
- Type: Article
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p.
385
–386
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A method for designing 2-dimensional stable recursive digital filters is presented. It dispenses with the computationally difficult task of separately testing for the stability of a 2-d digital transfer function, as it is ensured at all stages in the course of an optimisation algorithm. The method is essentially based on the propeties of 2-variable positive real functions.
Digital filtering using polynomial transforms
- Author(s): H.J. Nussbaumer
- Source: Electronics Letters, Volume 13, Issue 13, p. 386 –387
- DOI: 10.1049/el:19770280
- Type: Article
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p.
386
–387
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We define discrete transforms in a ring of polynomials. These polynomial transforms have the circular convolution property and can be used for the fast computation of 2-dimensional cyclic convolutions. This yields efficient algorithms for the implementation of 1- and 2-dimensional digital filters.
Referred impedance noise analysis for feedback amplifiers
- Author(s): J.L. Hullett and T.V. Muoi
- Source: Electronics Letters, Volume 13, Issue 13, p. 387 –389
- DOI: 10.1049/el:19770281
- Type: Article
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p.
387
–389
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A simple approach for calculating the equivalent input noise spectral density of feedback amplifiers is proposed. The method is particularly relevant to the design of amplifiers for use in optical-communication receivers.
Redundancy bounds for multipleburst error-correcting codes
- Author(s): G. Benelli ; C. Bianciardi ; V. Cappellini
- Source: Electronics Letters, Volume 13, Issue 13, p. 389 –390
- DOI: 10.1049/el:19770282
- Type: Article
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p.
389
–390
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Lower and upper redundancy bounds arc given for multiple low-density burst-error-corrccting block codes
Erratum: Comparison of numerical computations of optical-waveguide transmission parameters
- Author(s): J.M. Arnold ; G.A.E. Crone ; P.J.B. Clarricoats
- Source: Electronics Letters, Volume 13, Issue 13, page: 390 –390
- DOI: 10.1049/el:19770283
- Type: Article
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Erratum: Compensating fibre splice technique
- Author(s): M.L. Dakss and D.B. Schilb
- Source: Electronics Letters, Volume 13, Issue 13, page: 390 –390
- DOI: 10.1049/el:19770284
- Type: Article
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p.
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