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Antennas and Propagation Magazine, IEEE

Issue 3 • Date June 2004

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Displaying Results 1 - 25 of 54
  • IEEE-USA

    Publication Year: 2004 , Page(s): 139 - 140
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  • Constantine Balanis receives honorary doctorate

    Publication Year: 2004 , Page(s): 117
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  • Targetmaspect-dependent RCS: the effect on assumed beam angle

    Publication Year: 2004 , Page(s): 75 - 78
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  • Intellectual Property and Patent Abstracts

    Publication Year: 2004 , Page(s): 118 - 125
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  • CEM 2004 in the shakespeare country: a royal treat - as you like it

    Publication Year: 2004 , Page(s): 102 - 103
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  • Report on second international PhD school on selected topics in applied electromagnetics

    Publication Year: 2004 , Page(s): 96 - 98
    Cited by:  Papers (2)
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  • An experimental verification of the excitation power of a transmission line with a shunt load

    Publication Year: 2004 , Page(s): 30 - 35
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    The excitation power of a scattering body is governed, in general, by the forward-scattering theorem. In this paper, the theorem is reconfirmed by simply applying Poynting's theorem to a loaded transmission line. It is shown that the excitation power is determined by the interaction of the incident voltage with the forward-scattered current. For some special cases, the backward-scattering formula can yield the same result. A transmission line with a shunt load is one of the examples where the excitation power can be expressed as the real part of the product of the incident voltage and the conjugate of the backward-scattered current. In this work, an experiment has been performed to verify the above results. View full abstract»

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  • Meetings and Symposia

    Publication Year: 2004 , Page(s): 92 - 95
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  • Chapter News

    Publication Year: 2004 , Page(s): 66 - 68
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  • New product release

    Publication Year: 2004 , Page(s): 107
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  • Space-tapered circular (ring) array

    Publication Year: 2004 , Page(s): 70 - 73
    Cited by:  Papers (23)
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    This paper describes how the space-tampered linear array, designed to achieve a given linear distribution, can be extended to circular arrays. In linear array, Taylor distribution and uniform-amplitude array elements is used to approximate it. Spacing of the element is done so that the width associated with each element matches the scaled integral of the distribution along the same length. Each array element samples half spacing on each side. View full abstract»

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  • Applications of neural networks in wireless communications

    Publication Year: 2004 , Page(s): 130 - 137
    Cited by:  Papers (18)
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    In recent years, the art of using neural networks (NNs) for wireless-communication engineering has been gaining momentum. Although it has been used for a variety of purposes and in different ways, the basic purpose of applying neural networks is to change from the lengthy analysis and design cycles required to develop high-performance systems to very short product-development times. This article overviews the current state of research in this area. Different applications of neural-network techniques for wireless communication front ends are briefly reviewed, stressing the purpose and the way neural networks have been implemented, followed by a description of future avenues of research in this field. View full abstract»

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  • Iterative-solver convergence for loop-star and loop-tree decompositions in method-of-moments solutions of the electric-field integral equation

    Publication Year: 2004 , Page(s): 80 - 85
    Cited by:  Papers (25)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (808 KB) |  | HTML iconHTML  

    Method-of-moments (MoM) solutions of the electric-field integral equation using Rao-Wilton-Glisson (RWG) basis functions suffer from the so-called low-frequency breakdown. Introduction of loop-tree or loop-star decompositions of the basis functions can effectively solve this problem, and a number of papers have been published discussing various aspects with respect to these techniques. Several papers imply that loop-tree or loop-star decompositions may help to improve iterative-solver convergence for the solution of the resulting linear-equation systems. Since only a few results with respect to this issue are available, a study of the frequency-dependent iterative-solver convergence for RWG, loop-tree, and loop-star basis functions was performed. Two metallic scattering objects, with meshes comprising up to 21060 unknowns, were considered. RWG functions were found to provide the best convergence behavior, as long as the frequency considered was high enough to prevent the low-frequency breakdown. Among the loop-tree and loop-star bases, the loop-tree functions were found to be superior to the loop-star functions. The loop-tree functions resulted in good and stable convergence behavior if the number of subdivisions per wavelength was larger than a few hundred. Moreover, it is shown that the so-called loop-tree decomposition can also be viewed as a loop-cotree decomposition if an alternative tree of edges connecting the free vertices of the mesh is constructed. View full abstract»

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  • In Memoriam: David M. Kerns

    Publication Year: 2004 , Page(s): 87
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    Freely Available from IEEE
  • Stray signal source location in far-field antenna/RCS ranges

    Publication Year: 2004 , Page(s): 20 - 29
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1018 KB) |  | HTML iconHTML  

    Various methods for mapping stray signal sources in far-field antenna/RCS test ranges are summarized. These methods use the quiet-zone field probe data at a single frequency or over a frequency band. Relative merits and drawbacks of the various methods are discussed. It is shown that relatively simple processing of the field-probe data can be used for complete mapping of the stray signal sources. View full abstract»

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  • Education Column

    Publication Year: 2004 , Page(s): 108
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  • AP-S Officers and Administrative Committee

    Publication Year: 2004 , Page(s): 6
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  • High performance EM simulation and optimization and electronic design automation

    Publication Year: 2004 , Page(s): 2
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  • From Poldhu to the Italian station of Coltano: Marconi and the first years of transcontinental wireless

    Publication Year: 2004 , Page(s): 47 - 54
    Cited by:  Papers (1)
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    This paper presents the evolution of low-frequency, high-power transcontinental transmission, starting from the first successful transatlantic link from Poldhu up to the Italian transcontinental station of Coltano. The trend toward higher and higher transmitting power, and the dead end into which wireless was heading if it were not for research in the higher frequency ranges, are pointed out. View full abstract»

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  • AMTA Corner

    Publication Year: 2004 , Page(s): 144 - 145
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  • Diversity techniques for satellite communications: an educational graphical tool

    Publication Year: 2004 , Page(s): 109 - 114
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (759 KB) |  | HTML iconHTML  

    This paper presents an educational graphical tool for an understanding and teaching site and orbital diversity techniques. Such techniques are employed in satellite communications at frequencies above 10 GHz to counteract signal impairments due to rain. The satellite communication diversity performance tool (SCDPT) was developed using MATLABs graphical user interface (GUI). The tool illustrates the overall effect of rain fades and the application of diversity as a fade mitigation technique on the design of satellite communication systems to senior and graduate students studying telecommunications. View full abstract»

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  • Antenna pattern comparison between an outdoor cylindrical near-field test facility and an indoor spherical near-field antenna test facility

    Publication Year: 2004 , Page(s): 146 - 151
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (794 KB) |  | HTML iconHTML  

    A new spherical near-field probe-positioning device has been designed and constructed, consisting of a large 5.0 meter fixed arc. This arc has been installed in a near-field test facility, located at Alenia Marconi Systems, on the Isle of Wight, UK. As part of the near-field qualification, testing was performed on a ground-based radar antenna. The resultant patterns were compared against measurements collected on the same antenna on a large outdoor cylindrical near-field test facility, also located on the Isle of Wight [F. Steiner et al., Jan. 1994]. These measurements included multiple-frequency measurements and multiple pattern comparisons. This paper summarizes the results obtained as part of the measurement program, and includes discussions on the error budgets for the two ranges, along with a discussion of the mutual error budget between the two ranges. View full abstract»

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  • Broadband over power line: once more unto the breach

    Publication Year: 2004 , Page(s): 88 - 89
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    This paper discusses the latest developments in broadband over power line (BPL), a technology that envisions using power lines to do double duty by delivering high-speed Internet access to customers' homes. Widespread operation of Access BPL has raised interference concerns in the protection of licensed radio services. Nevertheless, the FCC has moved the technology one step closer to implementation by issuing a notice for proposed rule making (NPRM) in February 2004, a set of regulations authorizing the operation of BPL. View full abstract»

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  • Quantifying short-range surface-to-surface communications links

    Publication Year: 2004 , Page(s): 36 - 46
    Cited by:  Papers (13)
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    As wirelessly connected embedded systems become ubiquitous, previously undocumented propagation environments must be explored to support their design. This paper describes the results of a study of such an environment: short-range wireless propagation outdoors, near the ground. In the study, frequencies were considered within three industrial, scientific, and medical (ISM) bands: 902-928 MHz, 2400-2426 MHz, and 5725-5752 MHz. Experimental propagation loss was summarized based on measurements in eighteen environments, at varying heights, distances, and polarizations. Based on the data collected, the appropriateness of a simple design guideline, based on a two-ray propagation model, is discussed. Summaries of the path loss, fading, and the influences of antenna height, antenna separation, and surrounding clutter in highly variable environments are given. Additionally, limited numerical modeling of the impact of surface roughness is provided. Particular focus was given in the study to heights and distances appropriate for randomly deployed wireless sensor networks, such as autonomous unattended ground-sensor systems. View full abstract»

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  • Citations referenced but not read

    Publication Year: 2004 , Page(s): 116
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The IEEE Antennas and Propagation Magazine covers all areas relating to antenna theory, design, and practice.

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Editor-in-Chief
Mahta Moghaddam