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Antennas and Propagation Magazine, IEEE

Issue 2 • Date April 1998

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Displaying Results 1 - 12 of 12
  • In Memoriam: John Ramsay

    Publication Year: 1998 , Page(s): 50
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    Freely Available from IEEE
  • Propagation Of Radio Waves

    Publication Year: 1998 , Page(s): 88
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  • Control And Measurement Of Unintentional Electromagnetic Radiation

    Publication Year: 1998 , Page(s): 88 - 89
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  • Control and measurement of unintentional electromagnetic radiation - A partial retrospective review by the author

    Publication Year: 1998 , Page(s): 89 - 90
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    Freely Available from IEEE
  • Model-based parameter estimation in electromagnetics. II. Applications to EM observables

    Publication Year: 1998 , Page(s): 51 - 65
    Cited by:  Papers (31)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1380 KB)  

    Discusses spectral domain model based parameter estimation (MBPE), waveform-dominated MBPE, and adapting and optimizing the sampling of the generating model. These are discussed with reference to antenna theory including scattering View full abstract»

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  • Derivation of the Smith chart equations for use with MathCAD

    Publication Year: 1998 , Page(s): 99 - 101
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    A MathCAD document is described that provides the capability for plotting a set of normalized complex impedance data, which can be provided either from a data array or from an analytical expression. The generation of the Smith chart axis is done with analytical expressions, rather than with numerical techniques. An example of the use of this program is given, using a rectangular microstrip patch antenna model, generated by the HP Momentum electromagnetic simulator. The complete MathCAD document is provided as part of this paper View full abstract»

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  • Notation in vector analysis

    Publication Year: 1998 , Page(s): 65 - 66
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    After a brief comment on the work by Chen et al. (IEEE Transactions on Education, vol.41, no.1, p.61-9, February 1998), the author suggests a vector notation system for the electromagnetics community. The concepts of gradient, divergence and curl together with matrix operators are discussed View full abstract»

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  • Measurements of the VLF scattering pattern of the structured plasma of red sprites

    Publication Year: 1998 , Page(s): 29 - 38
    Cited by:  Papers (1)
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    Analysis of a large number of VLF scattering events associated with sprites results in an average scattering distribution having a strong frontal lobe, and also having strong large-angle scattering. This is consistent with the scattering pattern produced by a theoretical model of the sprite as an array of interacting vertical plasma columns, indicating that some part of the sprite is “hard” and contains complex structure (most likely the “stalactites” seen in optical sprites). Attempting to determine the scattering distribution due to sprites using a high threshold for event detection could result in observation of only the frontal lobe and the minima on either side of it, and not the scattering at larger angles. This problem would be worsened by the use of only amplitude, and not phase, monitoring to detect perturbations, and could lead experimenters to the conclusion that sprites are narrow-angle scatterers, with a smoothly varying diffuse structure View full abstract»

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  • Methods of constructing optimum phased-array antennas for limited field of view

    Publication Year: 1998 , Page(s): 39 - 50
    Cited by:  Papers (20)  |  Patents (4)
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    A survey is given of the methods of constructing phased-array antennas with optimum radiating structures that provide shaping of the flat-topped array-element patterns. This corresponds to maximization of the array gain in a given limited scanning sector, using a corresponding minimum number of controlled elements. The methods considered include the use of passive multiport networks, coupled dual-mode waveguides, protruding dielectric elements, corrugated structures, and quasi-optical networks that provide excitation of the necessary over-lapped subarrays View full abstract»

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  • Designing axially symmetric Cassegrain or Gregorian dual-reflector antennas from combinations of prescribed geometric parameters

    Publication Year: 1998 , Page(s): 76 - 82
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (436 KB)  

    A procedure to design axially symmetric Cassegrain or Gregorian dual-reflector antennas from various combinations of prescribed geometric parameters is presented. From these input parameters, the overall geometry of the antenna is derived in closed form. This procedure can be used as the starting point of a synthesis procedure, where both main reflector and subreflector are shaped to create the desired aperture field distribution View full abstract»

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  • Efficient ray-tracing techniques for three-dimensional analyses of propagation in mobile communications: application to picocell and microcell scenarios

    Publication Year: 1998 , Page(s): 15 - 28
    Cited by:  Papers (67)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1664 KB)  

    The application of several ray-tracing techniques, in combination with GTD/UTD (geometrical theory of diffraction/uniform theory of diffraction), for an efficient analysis of propagation in urban scenarios is presented. The frequency of the analysis is in the UHF band, and a three-dimensional model of the geometry, using flat facets, is considered. After a review of the most commonly used ray-tracing techniques, a new method, called the angular z-buffer (AZB) technique, is presented. As is shown and validated with results, the AZB appears to be extremely efficient for GTD/UTD applications View full abstract»

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  • Newton's observations of diffracted rays

    Publication Year: 1998 , Page(s): 7 - 14
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1112 KB)  

    The history of diffracted rays is usually considered to be less than a century long. However, a careful study of experiments and observations made by Newton and described in his Optiks shows that diffracted rays had been observed nearly 300 years ago. To show this is the goal of the present paper. Optiks Book III, part I, also comprehends diffraction. Of the various observations by Newton in that book, two have been chosen in the present paper to demonstrate, by applying modern theories, that Newton was actually observing diffracted rays 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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Mahta Moghaddam