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IEEE Antennas and Propagation Magazine

Issue 2 • Date April 2001

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Displaying Results 1 - 15 of 15
  • Intellectual property and patent abstracts

    Publication Year: 2001, Page(s):121 - 123
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    The author explains how examiners at the US Patent and Trademark Office (PTO) treat applications for inventions that seem to violate accepted scientific principles. In order to be entitled to a patent, an invention must be useful, novel, and non-obvious. In order to obtain a patent, the inventor must submit a specification that describes the invention in sufficient detail such that one of ordinary... View full abstract»

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  • Minimum sprite plasma density as determined by VLF scattering

    Publication Year: 2001, Page(s):12 - 24
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1433 KB) | HTML iconHTML

    The scattering of VLF sub-ionospheric transmissions by sprite plasma through horizontal angles up to 180/spl deg/ shows that sprite plasma is highly conducting. Following a simple transmission-line (one-dimensional-wave) model in 1997, two-dimensional and three-dimensional models have been produced. Here, we compare the results of the three models, and show that all require a uniform conductivity ... View full abstract»

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  • Efficient ray-tracing methods for propagation prediction for indoor wireless communications

    Publication Year: 2001, Page(s):41 - 49
    Cited by:  Papers (61)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (892 KB) | HTML iconHTML

    The application of several ray-tracing techniques, in combination with the uniform theory of diffraction, is presented for efficient prediction of propagation in the UHF (communication) band in an indoor environment. First, we improve the computational efficiency of the two-dimensional (2D) ray-tracing method by reorganizing the objects in an indoor environment into irregular cells. Second, by mak... View full abstract»

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  • Minutes of the AP-S AdCom meeting

    Publication Year: 2001, Page(s):64 - 69
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    Freely Available from IEEE
  • Radiowave propagation and smart antennas for wire less communications [Recent Books]

    Publication Year: 2001, Page(s): 86
    Request permission for commercial reuse | PDF file iconPDF (137 KB)
    Freely Available from IEEE
  • Tripole to the rescue [antennas]

    Publication Year: 2001, Page(s):106 - 107
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (230 KB) | HTML iconHTML

    Whether it is the Palm VIIx handheld organizer or the VV Kyocera Smartphone, people love the freedom offered by the wireless connectivity of these gadgets. However, what the wireless service providers try to downplay is the low-speed Internet connection necessitated by the congested radio channels in the cellular/PCS bands. Several strategies are being tried to deal with this problem. The present ... View full abstract»

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  • A 3D interpolation method for base-station-antenna radiation patterns

    Publication Year: 2001, Page(s):132 - 137
    Cited by:  Papers (24)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB) | HTML iconHTML

    A simple method for the estimation of three-dimensional radiation patterns from the horizontal and vertical cuts is presented, which leads to lower errors compared to some common methods. In order to evaluate its reliability, the method has been tested for various theoretical cases by considering dipoles, individually or in arrays. For the case of the half-wavelength dipole, a maximum error of 12.... View full abstract»

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  • The precautionary principle: a rose by another name [cellular radio health effects]

    Publication Year: 2001, Page(s):129 - 131
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB) | HTML iconHTML

    The number of cellular mobile telephone subscribers worldwide is in the 100s of millions, and is increasing at a rate of about 2% per month. The market penetration is well above 80% in some territories. Nevertheless, the potential health effects of radio frequency (RF) and microwave radiation, associated with cellular mobile telephones and related wireless devices, remain a leading cause of concer... View full abstract»

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  • A note on the method of analytical regularization

    Publication Year: 2001, Page(s):34 - 40
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB) | HTML iconHTML

    Many problems of electromagnetics are governed by singular integral equations of the first kind. As discussed by Nosich (1999), it is often possible to obtain a different equation describing the problem by applying the method of analytical regularization, and analytically inverting part of the original equation. The transformed equation is of the second kind. Therefore, as a rule, it is usually pr... View full abstract»

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  • A parallel FDTD algorithm using the MPI library

    Publication Year: 2001, Page(s):94 - 103
    Cited by:  Papers (112)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB) | HTML iconHTML

    In this paper, we describe the essential elements of a parallel algorithm for the FDTD method using the MPI (message passing interface) library. To simplify and accelerate the algorithm, an MPI Cartesian 2D topology is used. The inter-process communications are optimized by the use of derived data types. A general approach is also explained for parallelizing the auxiliary tools, such as far-field ... View full abstract»

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  • Electromagnetic energy around Hertzian dipoles

    Publication Year: 2001, Page(s):50 - 62
    Cited by:  Papers (20)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1192 KB) | HTML iconHTML

    This paper considers the behavior of electromagnetic energy around Hertzian dipoles. The method of “causal surfaces” (surfaces through which there is no net flow of electromagnetic energy) is used to partition and track the energy. A variety of examples, involving both transient and harmonic time dependence, are presented, to illustrate the way in which static and/or reactive energy is... View full abstract»

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  • A Monte Carlo study of the rough-sea-surface influence on the radar scattering from two-dimensional ships

    Publication Year: 2001, Page(s):25 - 33
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1004 KB) | HTML iconHTML

    The generalized forward-backward (GFB) method was introduced in Pino et al. (1999) for computing the electromagnetic scattering from two-dimensional targets on a rough surface. The GFB method is used in this article to generate numerical data for a Monte Carlo simulation of the horizontally polarized radar cross section (RCS) of two-dimensional ship-like targets on random rough sea surfaces. The R... View full abstract»

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  • Some comments on the IEEE's fiscal state of affairs

    Publication Year: 2001, Page(s):109 - 110
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

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  • Synthesis of onboard array antennas including interaction with the mounting platform and mutual coupling effects

    Publication Year: 2001, Page(s):76 - 82
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB) | HTML iconHTML

    The synthesis of array antennas mounted on ships, or any other vehicular platform, is addressed here. Both the mutual coupling between the array elements, and their interaction with the mounting platform, are considered and introduced into the synthesis procedure. This is done by using a three-dimensional formulation of the method of moments, which models the currents induced on the platform and t... View full abstract»

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  • The communication connection

    Publication Year: 2001, Page(s):116 - 118
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    First Page of the Article
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Mahta Moghaddam