Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 12, Issue 16, 5 August 1976
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Volume 12, Issue 16
5 August 1976
Experimental broadband ultrasonic transducers using PVF2 piezoelectric film
- Author(s): L. Bui ; H.J. Shaw ; L.T. Zitelli
- Source: Electronics Letters, Volume 12, Issue 16, p. 393 –394
- DOI: 10.1049/el:19760301
- Type: Article
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p.
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–394
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Broadband ultrasonic transducers using PVF2 piezoelectric plastics films, combining efficient transduction with extremely wide and uniform passbands, have been fabricated using very simple procedures without any critical tolerances Frequency spectra of impulsed transducers using films of 25 and 50 μm thickness, centred at 10 and 5 MHz, respectively, are shown.
In situ in etching technique for l.p.e. InP
- Author(s): V. Wrick ; G.J. Scilla ; L.F. Eastman ; R.L. Henry ; E.M. Swiggard
- Source: Electronics Letters, Volume 12, Issue 16, p. 394 –395
- DOI: 10.1049/el:19760302
- Type: Article
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p.
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–395
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An in situ In etch technique is described for l.p.e. growth of InP. This method eliminates substrate ‘sensitivity’ to orientation difficulties and removes any need for melt supersaturation to obtain good morphology. In addition, in situ etching removes any substrate pitting or type conversion which degrades actual device performance.
High-gain wide-gap-emitter Ga1-xAlxAs-GaAs phototransistor
- Author(s): H. Beneking ; H. Mischel ; G. Schul
- Source: Electronics Letters, Volume 12, Issue 16, p. 395 –396
- DOI: 10.1049/el:19760303
- Type: Article
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p.
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–396
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A Ga1-xAlxAs-GaAs heterostructure phototransistor has been manufactured and tested. The device is an n-p-n structure employing the ‘wide-gap-emitter’ effect. High internal current gain (>2000) has been achieved.
Single-mode stripe optical waveguides formed by silver ion exchange
- Author(s): J.G. Gallagher and R.M. de la Rue
- Source: Electronics Letters, Volume 12, Issue 16, p. 397 –398
- DOI: 10.1049/el:19760304
- Type: Article
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p.
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–398
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We report on the fabrication and mode structure of narrow stripe optical waveguides formed by silver ion exchange. Single-mode propagation at 0.633 μm wavelength has been obtained in guides whose width exceeds 7 μm.
Crossmodulation in IMPATT amplifiers
- Author(s): A. Javed and P.A. Goud
- Source: Electronics Letters, Volume 12, Issue 16, p. 399 –400
- DOI: 10.1049/el:19760305
- Type: Article
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A useful technique is presented for evaluating the crossmodulation of IMPATT-diode amplifiers. This technique uses Volterra series to represent the frequency-dependent nonlinear behaviour of impatt diodes. A numerical example is given.
Direct synthesis of discrete-time feedback systems by equivalence transformations of polynomial matrices
- Author(s): B. Porter
- Source: Electronics Letters, Volume 12, Issue 16, p. 400 –401
- DOI: 10.1049/el:19760306
- Type: Article
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p.
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It is shown that the synthesis of closed-loop linear multivariable discrete-time systems can be directly effected by performing equivalence transformations on appropriate polynomial matrices. These polynomial matrices are the Smith canonical forms of the closed-loop characteristic matrices of such systems subject to the constraints imposed by the fundamental theorem of linear state-variable feedback.
Inductive loading of the bias path in IMPATT-diode circuits
- Author(s): F.E. Marchetti and M.G. Reggiani
- Source: Electronics Letters, Volume 12, Issue 16, p. 401 –402
- DOI: 10.1049/el:19760307
- Type: Article
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It is shown that the addition of a large series inductance in the bias path of an IMPATT-diode circuit improves its low-frequency stability margin.
Carrier density dependence of resonantly pumped magnetically tunable InSb laser
- Author(s): T. Yoshida ; H. Ogura ; A. Shigetomi ; K. Miyazaki ; K. Fujisawa
- Source: Electronics Letters, Volume 12, Issue 16, p. 402 –403
- DOI: 10.1049/el:19760308
- Type: Article
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Laser emission in InSb resonantly pumped by a TE CO laser was observed, and the magnetic tuning characteristic was investigated for the samples with different carrier densities. The tuning range of about 8 meV (65 cm−1) was obtained for magnetic fields of up to about 20 kG.
Flip-chip approach to endfire coupling between single-mode optical fibres and channel waveguides
- Author(s): H.P. Hsu and A.F. Milton
- Source: Electronics Letters, Volume 12, Issue 16, p. 404 –405
- DOI: 10.1049/el:19760309
- Type: Article
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p.
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We report a practical approach to the positioning of a number of single-mode fibres for endfire coupling to channel waveguides. Boivin's approach has been extended to a flip-chip configuration which permits its use with substrates other than silicon.
Determination of the ellipticity of monomode glass fibres from measurements of scattered light intensity
- Author(s): W. Eickhoff and O. Krumpholz
- Source: Electronics Letters, Volume 12, Issue 16, p. 405 –407
- DOI: 10.1049/el:19760310
- Type: Article
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p.
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–407
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A nondestructive method is proposed to determine the core ellipticity of a monomode fibre from measurements of the scattered light intensity.
Mode behaviour in a tapered multimode fibre
- Author(s): Takeshi Ozeki and B.S. Kawasaki
- Source: Electronics Letters, Volume 12, Issue 16, p. 407 –408
- DOI: 10.1049/el:19760311
- Type: Article
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p.
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–408
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A derivation based on ray tracing and the local plane-wave approximation is used to show the behaviour of waveguide modes in a linearly tapered multimode fibre having a step-index profile. The azimuthal mode order l is invariant through the taper, and, for suitably designed tapers, the changes in the radial mode order m and the lateral component u are negligible. A formula for designing such tapers is presented.
New glass system for low-loss optical waveguides
- Author(s): R.G. Sommer ; R.D. Deluca ; G.E. Burke
- Source: Electronics Letters, Volume 12, Issue 16, p. 408 –409
- DOI: 10.1049/el:19760312
- Type: Article
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p.
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Optical fibres have been made by the vapour deposition of P2O5-GeO2-SiO2 glass onto the inside surface of Corning Code 7913 glass tubes. These graded-index core waveguides exhibit low attenuations, i.e. 4.0 dB/km at 0.82μm.
Simple formulas for microstrip lines
- Author(s): R.F.G. Ross and M.J. Howes
- Source: Electronics Letters, Volume 12, Issue 16, page: 410 –410
- DOI: 10.1049/el:19760313
- Type: Article
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A modification to earlier work is presented which allows for finite strip thickness in the calculation of microstrip impedance and line wavelength. It shows a considerable improvement in accuracy and scope over some earlier work which included strip thickness, but remains simple in form. Expressions are presented which allow calculation of Z and λg for any microstrip geometry and relative permittivity.
Algebraic description of J-contractive real matrices
- Author(s): T.T. Ha and O. Ijaola
- Source: Electronics Letters, Volume 12, Issue 16, p. 411 –412
- DOI: 10.1049/el:19760314
- Type: Article
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–412
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Necessary and sufficient conditions are given for J-contractive real matrices in terms of their state-space representation. It is shown that chain and chain scattering matrices of linear, time-invariant, passive networks are J-contractive real matrices.
Explicit formulas for the synthesis of Cheby̅shev impedance-matching networks
- Author(s): Wai-kai Chen
- Source: Electronics Letters, Volume 12, Issue 16, p. 412 –413
- DOI: 10.1049/el:19760315
- Type: Article
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p.
412
–413
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Explicit formulas for the matching of the most practical RLC load to a resistive generator to achieve the nth-order Cheby̅shev transducer power/gain characteristic having maximum attainable d.c. gain are presented.
Propagation in cylindrical fibres with anisotropic crystal cores
- Author(s): J.R. Cozens
- Source: Electronics Letters, Volume 12, Issue 16, p. 413 –415
- DOI: 10.1049/el:19760316
- Type: Article
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p.
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–415
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Expressions for the fields and propagation constants in cylindrical dielectric waveguides with umaxial crystal cores are found. The propagation constants of biaxial-crystal-cored guides are then deduced from a coupled-mode analysis, using the uniaxial solutions as ideal modes.
Inadequacy of the Rayleigh range criterion for superdirective arrays
- Author(s): A.C. Marvin ; A.P. Anderson ; J.C. Bennett
- Source: Electronics Letters, Volume 12, Issue 16, p. 415 –416
- DOI: 10.1049/el:19760317
- Type: Article
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p.
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–416
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The Rayleigh range criterion for measurement of radiation patterns is shown to be inadequate for superdirective arrays. An acceptable distance for radiation-pattern measurements depends on the tolerance of the superdirective illumination function.
Dielectric cone feeds with a shaped reflecting surface
- Author(s): L. Shafai and R.K. Chugh
- Source: Electronics Letters, Volume 12, Issue 16, p. 416 –418
- DOI: 10.1049/el:19760318
- Type: Article
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p.
416
–418
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The feasibility of replacing the fabricated metallised foam subreflector in dielguides by the shaped dielectric surface has been demonstrated. The design of the shaped surface is based on the principles of geometrical optics. Out of the many curvatures obtained, two shaped surfaces result in a conical main reflector for one case and a conical subreflector for the second case.
Integrable, wideband, automatic volume control (a.v.c.) using Pythagoras's law for amplitude detection
- Author(s): F. Doorenbosch and Y. Goinga
- Source: Electronics Letters, Volume 12, Issue 16, p. 418 –420
- DOI: 10.1049/el:19760319
- Type: Article
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The design of an a.v.c. is a simple application of control theory. The main problem in realising an integrable wideband a.v.c. is the amplitude detector. An implementation of Pythagoras's law acts magnificently in a slow a.v.c. However, in a fast a.v.c., offset will cause some 2nd-harmonic distortion.
Comment on ‘New method of obtaining reduced-order models for linear multi-variable systems’ [and reply]
- Author(s): H. Singh ; H. Singh ; J. Hickin ; N.K. Sinha
- Source: Electronics Letters, Volume 12, Issue 16, page: 420 –420
- DOI: 10.1049/el:19760320
- Type: Article
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