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Antennas and Propagation Magazine, IEEE

Issue 6 • Date Dec. 1996

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Displaying Results 1 - 14 of 14
  • Animating the evolution of a field

    Page(s): 7 - 17
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    Many problems in electromagnetics involve modeling a changing multi-dimensional field, and one can often gain insight into the underlying physical problem by animating the changes. The ability to view directly the evolving field may also provide a useful debugging tool during modeling and simulation. Here, we present a relatively simple scheme to animate a changing two-dimensional field (in this case EM wave propagation is considered in particular). The scheme permits various mappings of field values to colors, so that the color of each pixel in an image indicates the field found at the corresponding location within the computational domain. Alternatively, a gray-scale mapping can be used. A program used to construct individual frames of the animation is presented in full. Sufficient detail is given so that the customization of the code is straightforward. Public-domain software is used to view the frames as an animated sequence, or to generate an MPEG file. Some aspects of the scheme described here are tailored for use in an X-Windows or UNIX environment, but most of the important steps are independent of the operating system. Frame-generation routines are presented in FORTRAN (C versions of the code are similar and can be obtained "on-line"). The scheme presented here is relatively fast, efficient, and flexible, and should serve well as a starting point for those wanting to "roll their own" graphics. In addition, for those needing more sophisticated renderings, pointers are given to several powerful commercial and public-domain graphics packages. View full abstract»

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  • Comments on "A Study of VLF Antennas Immersed in Sea Water: Theoretical, Numerical, and Experimental Results"

    Page(s): 120 - 121
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    Freely Available from IEEE
  • PC's for AP and Other EM Reflections

    Page(s): 87 - 90
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    First Page of the Article
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  • Reciprocal circular-polarization-selective surface

    Page(s): 18 - 33
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    This paper presents the concept of an electromagnetic surface called the circular-polarization-selective surface (CPSS). Few papers have dealt with the CPSS, and it has even been argued that the ideal CPSS belongs to the category of impossible polarizers. We present herein a theoretical proof for the existence of the ideal CPSS, review the prior art in this area, identify some geometrical constraints inherent to such a device, and present the results of numerical computations View full abstract»

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  • MF AM asymmetric vertical-dipole-antenna measurements

    Page(s): 75 - 82
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (816 KB)  

    A medium-frequency AM transmitting vertical dipole for a 50 kW broadcast station was constructed, during May and June, 1994, at Buenos Aires, Argentina. This kind of vertical dipole operates without the classic, 120-wire, buried artificial ground plane. In order to analyze its behavior, extensive measurements of the near and far fields were carried out. A comparison to standard monopoles gave a better understanding of the performance and efficiency parameters. The nocturnal service area was determined by measurements, in order to observe the antenna's high-angle radiation, and to compare it with the theoretical radiation pattern. Comparison with the previous monopole antenna confirmed that substantial improvements were obtained with this new installation, both antennas being of similar height. The measurements showed an improved coverage of both diurnal and nocturnal service areas, estimated to be four times the previous service areas View full abstract»

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  • Finite-element methods in microwaves: a selected bibliography

    Page(s): 34 - 48
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    This paper reviews the history and present state of finite-element methods, as applied to electromagnetic-field problems in the microwave range (including element definitions and error estimation, guided wave propagation, scattering and antenna problems). It provides a selective bibliography, current as of the first months of 1996, with annotations and evaluative comments on the works surveyed. It briefly notes the capabilities of the finite-element method, and estimates how fully they have been realized to date. Some conjectures on the future of finite-element methods are also hazarded View full abstract»

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  • Memory errors: roll the dice!

    Page(s): 124 - 125
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  • Marconi in Switzerland

    Page(s): 68 - 69
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    Describes the first experiments of Marconi in the Swiss Alps near the village of Salvan from when he arrived there in 1895. The assistance of Maurice Gay-Balmaz is also mentioned View full abstract»

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  • Antenna development in China

    Page(s): 49 - 63
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    A brief review of the history and geography of antenna developments in China is presented. Aperture antennas and array antennas together with antenna measurements are discussed in particular. Antenna developments in Taiwan, Hong Kong, and Macao are not included View full abstract»

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  • The Pace Report

    Page(s): 127 - 128
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  • Ionospheric studies and sounding at the CRIRP

    Page(s): 64 - 67
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    The studies and research which have been carried out for ionospheric sounding at the CRIRP (China Research Institute of Radiowave Propagation) are briefly described. Also described are major results, including the setup and programs of the observation network. Finally, the future, developing plans of the CRIRP are described View full abstract»

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  • Computer-algebra systems and electromagnetic problems

    Page(s): 92 - 98
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    This paper presents some computer-algebra systems, and explains how these systems are likely to be relevant in addressing electromagnetic problems. After a historical survey, we discuss the various systems and their features. Some examples are given, with an important bibliography. A listing of Web sites (of interest to the antennas and propagation community) is also given. Finally, we outline how a given problem can be formalized and analyzed using symbolic-algebra systems, and show an example calculation for a conformal-microstrip antenna View full abstract»

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The IEEE Antennas and Propagation Magazine covers all areas relating to antenna theory, design, and practice.

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W. Ross Stone