Proceedings of the IEEE

Issue 6 • June 1981

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Displaying Results 1 - 24 of 24
  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): c1
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  • Scanning the issue

    Publication Year: 1981, Page(s): 675
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  • Electromagnetics and differential forms

    Publication Year: 1981, Page(s):676 - 696
    Cited by:  Papers (124)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1803 KB)

    Differential forms of various degrees go hand in hand with multiple integrals. They obviously constitute an essential tool in expressing the laws of physics. Some of their structures, however (exterior algebra, exterior differential operators, and others), are not widely known or used. This article concentrates on the relevance of the "exterior calculus" to electromagnetics. It is shown that the a... View full abstract»

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  • Radio propagation for space communications systems

    Publication Year: 1981, Page(s):697 - 727
    Cited by:  Papers (72)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2313 KB)

    This paper presents a review of the most recent information on the effects of the earth's atmosphere on space communications systems. The design and reliable operation of satellite systems which provide the many applications in space and rely on the transmission of radio waves for communications and scientific purposes are dependent on the propagation characteristics of the transmission path. The ... View full abstract»

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  • The design of low-noise amplifiers

    Publication Year: 1981, Page(s):728 - 741
    Cited by:  Papers (76)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1282 KB)

    The essential theory and practical considerations for the design of low-noise amplifiers are gathered and organized to a uniform presentation. The relevant material is quite simple and straightforward, hopefully bringing within the reach of the interested circuit designer the "art" of low-noise-amplifier design. View full abstract»

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  • Ray tracing method for doubly curved reflector surfaces

    Publication Year: 1981, Page(s):743 - 744
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (166 KB)

    Shaped reflector surfaces designed for microwave antennas are often defined by a regular grid of discrete points. A ray tracing procedure useful for computing aperture and power distributions produced by an arbitrarily shaped reflector surface is described. View full abstract»

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  • An antenna beam steering technique comprised of constant-phase array elements

    Publication Year: 1981, Page(s):745 - 747
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (287 KB)

    Beam steering is normally achieved by the use of phase shifters at each element of an array. The phase taper thereby produced causes a shift of the far-field pattern in sin θ space. An alternate approach to beam steering is presented in which a pair of interleaved arrays are employed. One array of the pair is fed entirely by currents of zero phase, while the other array is fed entirely by cur... View full abstract»

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  • Impulse response of a conducting sphere based on singularity expansion method

    Publication Year: 1981, Page(s):747 - 750
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (335 KB)

    An approximate method based on the singularity expansion method is developed to determine the impulse response of a conducting sphere. View full abstract»

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  • Alternative methods for ray propagation in absorptive media

    Publication Year: 1981, Page(s):750 - 751
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (234 KB)

    The determination of a set of Hamilton equations for ray tracing in absorbing media is still an open problem. Recently Suchy proposed another alternative, based on the Connor-Felsen criterion of real propagation vectors. It is shown here that the same criterion can be applied in a different form, leading to yet another alternative. The present method, similarly to a previous one, preserves the ana... View full abstract»

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  • Large signal instability in active RC biquadratic filter building blocks

    Publication Year: 1981, Page(s):751 - 753
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (250 KB)

    A comprehensive report on the investigation of large signal instability in second-order high-Q active-RC filters is given. The condition for oscillation and formulas for evaluating the frequencies are derived. Among the several filter building blocks considered, the ones, which are unconditionally stable, are indicated. View full abstract»

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  • Comments on "Index profile measurement of fibers and their evaluation"

    Publication Year: 1981, Page(s):753 - 754
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  • An in-place levinson update algorithm

    Publication Year: 1981, Page(s):754 - 755
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (224 KB)

    An in-place Levinson update algorithm is presented which requires less storage than update algorithms in some published programs. The algorithm may be easily implemented in a program which employs a Levinson recursion. View full abstract»

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  • Correction to "Comments on 'signal duration and the Fourier transform'"

    Publication Year: 1981, Page(s): 755
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  • SURF: A telegraph signal based uniformly distributed analog random voltage generator

    Publication Year: 1981, Page(s):755 - 756
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (201 KB)

    The generation of uniformly distributed analog random voltages is a difficult problem, generally solved by methods using digital-to-analog conversion following a random number generator. We describe a new and easy implement system based on linear filtering of a random telegraph signal. View full abstract»

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  • TMR crystal controlled clock

    Publication Year: 1981, Page(s):756 - 757
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (174 KB)

    Triple modular redundant circuit for clock generation has been fabricated using CMOS gates and the test results for different types of single fault conditions are presented. View full abstract»

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  • Conversion of transient stability problems to equivalent systems employing an infinite bus

    Publication Year: 1981, Page(s):758 - 760
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (233 KB)

    The classical two machine system conversion to an equivalent system of one finite machine and an infinite bus has been used widely in calculation of swing curves and critical clearing angles. This letter describes direct calculation of equivalent-system swing curves extended to the general (m - 1)-machine system and one infinite bus. View full abstract»

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  • A time-domain technique for measurement of the dielectric properties of oil shale during processing

    Publication Year: 1981, Page(s):760 - 762
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (280 KB)

    Frequently, the dielectric properties of oil shale is measured using the point-by-point frequency domain methods [1]-[4]. Such procedures have significantly limited the adequacy of the measurements to track fast (or abrupt) chemical changes occurring during the rapid heating of the shale. This communication describes a time-domain technique which provides the permittivity behavior over a broad fre... View full abstract»

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  • Multilevel load frequency control (a perturbational approach)

    Publication Year: 1981, Page(s):762 - 764
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (223 KB)

    A two-level control scheme for the load frequency control of a multi-area power system utilizing certain possible beneficial aspects of interconnections is described in this paper. The problem is identified as the determination of the necessary equivalent perturbation on the control distribution matrix to provide the corrective control. View full abstract»

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  • Speech analysis

    Publication Year: 1981, Page(s): 765
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  • Optical fibers for transmission

    Publication Year: 1981, Page(s):765 - 766
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  • Modern transmission line theory and applications

    Publication Year: 1981, Page(s): 766
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  • Analog and digital communication systems

    Publication Year: 1981, Page(s):766 - 767
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  • Book alert

    Publication Year: 1981, Page(s):767 - 768
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  • [Back cover]

    Publication Year: 1981, Page(s): c4
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H. Joel Trussell
North Carolina State University