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IEEE Antennas and Propagation Magazine

Issue 2 • Date April 1995

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Displaying Results 1 - 9 of 9
  • A helical-beam antenna without a ground plane

    Publication Year: 1995
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (167 KB)

    The helical-beam antenna (a.k.a. axial-mode helix), which the author devised in 1946, was fed via a ground plane. This arrangement has proven very satisfactory for many applications. Now, almost 50 years later, he presents a version in which the ground plane is replaced by one or more loops. This design is well suited for pole mounting. It has less wind resistance, and presents a much-cleaner appe... View full abstract»

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  • On the propagation of transients in waveguides

    Publication Year: 1995, Page(s):39 - 44
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Transient propagation in a rectangular waveguide is examined, using elementary dispersion theory. Simple experiments are presented, which validate the theory and illustrate the concepts of group velocity, wave-front velocity, and wave precursors in a rectangular waveguide. The precursor phenomenon is isolated by examining the step response of the waveguide, using a time-domain reflectometer, showi... View full abstract»

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  • Use of Euler-rotation angles for generating antenna patterns

    Publication Year: 1995, Page(s):56 - 63
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    Antenna patterns are most naturally expressed in spherical coordinates, since the pattern angles represent directions in space. All patterns can be represented by circles on the coordinate sphere. Most patterns are either polar great-circle patterns or equatorial patterns, referring to the coordinate sphere, where all look directions lie in a plane. In some cases, however, the surface containing a... View full abstract»

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  • Fresnel-integral approximation

    Publication Year: 1995, Page(s):99 - 100
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (96 KB)

    In diffraction analysis, an approximation to K-(x)=1/(√π)eix(2)+iπ/4x e-it(2) dt, (0<x<∞) is often required. The authors give an approximation A(x) to K-(x), suitable for computation with a hand-held computer, such as the HP-288 View full abstract»

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  • The geodesic constant method: a novel approach to analytical surface-ray tracing on convex conducting bodies

    Publication Year: 1995, Page(s):28 - 38
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    A generalized approach to analytical surface-ray tracing in three dimensions, and a review of its application to convex conducting bodies, is presented, using the Eisenhart coordinate system. The ray-parameters so obtained, for quadric cylinders (QUACYLs) and surfaces of revolution (QUASORs), are in a one-parameter form for UTD mutual-coupling applications. The ray analysis is also extended to the... View full abstract»

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  • Some comments on research and publication practices and ethics

    Publication Year: 1995, Page(s):78 - 81
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Pressure has increased on engineering faculties to do more, including publishing. Publication has also become more common as a “ticket” to the proliferating number of meetings being held, where giving a paper is often the only way to ensure attending a meeting. The result has been an apparently substantial increase in the amount of publication by those active in their fields. It has po... View full abstract»

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  • An introduction to genetic algorithms for electromagnetics

    Publication Year: 1995, Page(s):7 - 15
    Cited by:  Papers (392)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    This article is a tutorial on using genetic algorithms to optimize antenna and scattering patterns. Genetic algorithms are “global” numerical-optimization methods, patterned after the natural processes of genetic recombination and evolution. The algorithms encode each parameter into binary sequences, called a gene, and a set of genes is a chromosome. These chromosomes undergo natural s... View full abstract»

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  • PERIODIC3: a software package for the analysis of artificially anisotropic surfaces

    Publication Year: 1995, Page(s):83 - 86
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    Describes a computer code, for computing the reflectivity of corrugated periodic surfaces at all incidence angles, including skew incidences (i.e., the 2.5D problem). This is a self-contained code, and is available from the authors. Since the finite element method is employed for modeling the corrugations, the periodic cell can be of any shape and material composition, and this is one of the most ... View full abstract»

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  • Superdirective antennas with passive reflectors

    Publication Year: 1995, Page(s):16 - 27
    Cited by:  Papers (24)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    A brief introduction to the problem of superdirective radiation in antenna theory, and a solution to the problem of wave scattering from a structure, formed by resonant scatterers, is presented. The paper describes construction of a two-dimensional superdirective antenna with one active element, and a reflector made of resonant scatterers-unclosed cylinders proposed by Veremey and Shestopalov (see... View full abstract»

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