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Electronics Letters

Issue 24 • Date November 25 1976

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Displaying Results 1 - 12 of 12
  • Phase imaging with the scanning acoustic microscope

    Publication Year: 1976 , Page(s): 637 - 638
    Cited by:  Papers (4)
    Click to expandAbstract | PDF file iconPDF (463 KB)  

    A new mode of operation for the acoustic microscope is described whereby the phase shift through the object is displayed in the form of an image. Experimental results are presented at an acoustic frequency of 1000 MHz. It is hoped that the `phase-only¿ images obtained with this technique will complement the conventional amplitude transmission images by providing additional information about the a... View full abstract»

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  • Closed-loop feedback systems using reduced-order models

    Publication Year: 1976 , Page(s): 638 - 639
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (224 KB)  

    Theorems are given to demonstrate that the tracking properties of reduced-order models obtained by Padé-type approximation methods are unchanged under constant (and dynamic) state or output feedback. Hence it follows that an optimal feedback law for the reduced-order model may be used for suboptimal control of the high-order system, with similar tracking of the output as for the open-loop case. View full abstract»

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  • Design of microstrip power dividers with simple geometry

    Publication Year: 1976 , Page(s): 639 - 641
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (346 KB)  

    A design procedure for microstrip power dividers is presented using a waveguide model with frequency-dependent parameters and a mode-matching method. A microstrip T-junction is matched by using a compensating element similar to a quarter-wave transformer. Plots of calculated and measured scattering parameters, as well as plots of the dimensions of the compensating element against centre frequency,... View full abstract»

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  • Frequency-dependent transmission properties of truncated microstrip right-angle bends

    Publication Year: 1976 , Page(s): 641
    Cited by:  Papers (2)
    Click to expandAbstract | PDF file iconPDF (121 KB)  

    Knowing the scattering parameters of an unsymmetrical cross junction, the reflection and transmission coefficients of a 90 bend truncated in an angle of 45 can be derived by considering special symmetries. For higher frequencies, the transmission properties of these truncated bends are much better than those of normal right-angle bends. View full abstract»

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  • Microstrip transmission lines on pyrolytic boron nitride

    Publication Year: 1976 , Page(s): 642 - 643
    Cited by:  Papers (9)
    Click to expandAbstract | PDF file iconPDF (257 KB)  

    Pyrolytic boron nitride is studied as a substrate material for microstrip transmission lines. The characteristic impedances Ze and Zo the phase velocities vpe and vpo and voltage coupling constant K for the even and odd quasistatic TEM modes are given. View full abstract»

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  • Random arrays for source parameter estimation

    Publication Year: 1976 , Page(s): 643 - 644
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (302 KB)  

    Phase measurements at the elements of a highly thinned, large-aperture random array can be used to efficiently estimate the parameters of a distant source. The theory for this is developed, and an illustrative computer stimulation example is given. View full abstract»

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  • Fast number-theoretic transforms for digital filtering

    Publication Year: 1976 , Page(s): 644 - 646
    Cited by:  Papers (3)
    Click to expandAbstract | PDF file iconPDF (451 KB)  

    A special number-theoretic transform that can be computed, using a high-radix fast Fourier transform, is defined on primes of the form (2n ¿ 1) 2n +1. Methods for finding these primes and the primitive dth roots of unity in a field modulo such primes are also included. View full abstract»

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  • Processor management in a multiprocessor system

    Publication Year: 1976 , Page(s): 646 - 647
    Click to expandAbstract | PDF file iconPDF (339 KB)  

    In a single-processor system, much investigation has been carried out into the way in which memory should be managed. In a multiprocessor system, the management of processors is equally important, and many of the results of memory management investigations are applicable to processor management also. The letter explains the similarities and their consequences on processor-management policies in a ... View full abstract»

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  • Integrated direction-sensitive flowmeter

    Publication Year: 1976 , Page(s): 647 - 648
    Cited by:  Papers (5)
    Click to expandAbstract | PDF file iconPDF (311 KB)  

    Careful investigation of the cooling of a heated body in a flow shows that in integrated silicon technology a very small flowmeter can be made with a well defined direction-sensitive response over a wide range of flow speeds. View full abstract»

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  • Novel GaAs metallised diode configurations to reduce skin-effect contributions at high frequencies

    Publication Year: 1976 , Page(s): 648 - 650
    Cited by:  Papers (2)
    Click to expandAbstract | PDF file iconPDF (419 KB)  

    A highly reliable metallised GaAs Ta-Schottky-barrier diode with native-oxide passivation has been developed. The zero bias cutoff frequency of these diodes is greater than 1000 GHz when measured accurately near 60 GHz, with a zero-bias junction capacitance near 0·1 pF. This zero-bias cutoff frequency is approximately twice the value for a comparable nonmetallised device. The letter describes the... View full abstract»

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  • Horizontal shear surface waves on corrugated surfaces

    Publication Year: 1976 , Page(s): 650 - 651
    Cited by:  Papers (56)
    Click to expandAbstract | PDF file iconPDF (396 KB)  

    Experiments have been performed on horizontal shear surface-wave propagation along a corrugated surface. The results are in agreement with approximate theories used in analogous electromagnetic problems. View full abstract»

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  • Pyroelectric vidicons with improved readout

    Publication Year: 1976 , Page(s): 652
    Click to expandAbstract | PDF file iconPDF (396 KB)  

    The performance of a television camera using a pyroelectric Vidicon has been improved by the use of flyback gas pedestal generation and a low-relative-permittivity target material. View full abstract»

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Aims & Scope

Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

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Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White
Head of Photonics Research
University of Cambridge, UK