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IEEE Antennas and Propagation Magazine

Issue 4 • Date Aug 1995

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Displaying Results 1 - 7 of 7
  • Code scaling

    Publication Year: 1995, Page(s):82 - 86
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The order of an electromagnetics algorithm or code is defined by the rate at which the CPU time, and memory requirements CCPU=O(fα) and Cm=O(fβ ), respectively-grow with frequency. Knowledge of this information helps in the prediction of computer-run times and memory requirements for problems of interest. This paper presents a methodology for ... View full abstract»

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  • Excitation of a conducting half-space by a toroidal coil

    Publication Year: 1995, Page(s):72 - 74
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    The possibility exists that a non-contacting “vertical-electrical dipole”source could be devised, to excite both horizontal and vertical currents in the subsurface. The scheme is quite simple, but it seems to have been overlooked or, at least, not disclosed, hitherto. The idea is to employ a toroidal coil carrying an alternating current, which is located in or just above the air/earth ... View full abstract»

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  • Phase difference between linear components of elliptically polarized waves from amplitude only measurements

    Publication Year: 1995, Page(s):69 - 70
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    An amplitude-only measurement setup can measure the axial ratio and tilt angle of an elliptically polarized wave. During design, both the amplitude and phase of the linear components are needed. The equipment measures the amplitudes directly. A nomograph, using the well-known relationships between polarization components determines the phase of the vertical component relative to the horizontal. Th... View full abstract»

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  • Advances in MININEC

    Publication Year: 1995, Page(s):7 - 12
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A brief history of the development of MININEC is presented. Differences between MININEC and NEC are discussed. A new version, MININEC Professional for Windows, is described, along with the application of this new version. The original purpose of the code was to provide a tool for the rapid analysis of simple, relatively small (in terms of wavelengths) antenna structures View full abstract»

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  • A selective survey of the finite-difference time-domain literature

    Publication Year: 1995, Page(s):39 - 57
    Cited by:  Papers (127)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1772 KB)

    The finite-difference time-domain (FDTD) method is arguably the most popular numerical method for the solution of problems in electromagnetics. Although the FDTD method has existed for nearly 30 years, its popularity continues to grow as computing costs continue to decline. Furthermore, extensions and enhancements to the method are continually being published, which further broaden its appeal. Bec... View full abstract»

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  • Supergain antennas: possibilities and problems

    Publication Year: 1995, Page(s):13 - 26
    Cited by:  Papers (5)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1092 KB)

    In principle, any desired amount of gain can be developed from an antenna of arbitrary size. The phenomena of high gain from very small antennas is called “supergain”. To see why this statement might be so, the author recalls the construction used in optics, known as Huygens' principle. This states that every point on a wavefront can be regarded as a source of radiation. At the end of ... View full abstract»

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  • Analysis of aperture-coupled microstrip-Antenna and circuit structures using the transmission-line-matrix method

    Publication Year: 1995, Page(s):27 - 37
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (948 KB)

    The transmission-line-matrix method is a numerical technique for solving Maxwell's equations in the presence of complex environments. A general-purpose simulation program, based on the three-dimensional symmetrical-condensed TLM model, is presented. Previous applications of the simulation program include the analysis of half-space and remote-sensing problems, and calculation of the radar cross sec... View full abstract»

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