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Antennas and Propagation Magazine, IEEE

Issue 3 • Date June 2002

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Displaying Results 1 - 16 of 16
  • Photos from the 2002 AP-S Awards Banquet

    Publication Year: 2002 , Page(s): 74 - 82
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    Freely Available from IEEE
  • In memoriam: Nasser Golshan

    Publication Year: 2002 , Page(s): 130
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    Freely Available from IEEE
  • 2002 IEEE Dennis J. Picard medal for radar technologies and applications

    Publication Year: 2002 , Page(s): 137
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    Freely Available from IEEE
  • 2002 S. A. Schelkunoff transactions prize paper award

    Publication Year: 2002 , Page(s): 137
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    Freely Available from IEEE
  • Honorable Mention for the S.A. Schelkunoff Transactions Prize Paper award

    Publication Year: 2002 , Page(s): 137
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    Freely Available from IEEE
  • 2002 Harold A. Wheeler applications prize paper award

    Publication Year: 2002 , Page(s): 137
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    Freely Available from IEEE
  • R.W.P. King Award

    Publication Year: 2002 , Page(s): 137
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    Freely Available from IEEE
  • Applications of the Lambert W function in electromagnetics

    Publication Year: 2002 , Page(s): 139 - 142
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (372 KB)  

    The solution to many EM problems can be formulated in terms of the Lambert W function. Several have been presented here. The function frequently occurs in the dispersion relations for transmission-line problems when the limiting cases of small radius or thickness are considered. Numerical algorithms of the function have been incorporated into the popular mathematical computation packages, which allows the efficient and rapid solution of problems that have traditionally been done graphically. View full abstract»

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  • Millimeter-wave folded reflector antennas with high gain, low loss, and low profile

    Publication Year: 2002 , Page(s): 24 - 29
    Cited by:  Papers (53)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (784 KB) |  | HTML iconHTML  

    Periodic and quasi-periodic structures, printed on a dielectric substrate, can be employed to control the reflection and transmission properties of incident waves as a function of structure geometry. Local variations of the element geometry on a substrate with backside metallization - resulting in respective variations of the reflection phase angle - can be used to design printed reflectarray antennas. The dual-polarization properties of such antennas, together with polarizing grids or slot arrays, can be exploited for the realization of compact, low-profile folded reflector antennas. Examples of some antennas of this type are presented, covering the 60 GHz range for communication and ISM applications, and 76 to 77 GHz for automotive radars. View full abstract»

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  • Conformal array antenna for observation platforms in low Earth orbit

    Publication Year: 2002 , Page(s): 103 - 104
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (371 KB) |  | HTML iconHTML  

    A conformal array antenna can provide the flexibility that platforms in low Earth orbit need to download their data to ground stations. It does this by producing multiple beams for various ground stations. Even if only one ground station is used at a time, the higher gain of this antenna, compared to a fixed-beam antenna, allows the ground-station antennas to be down-sized, or, equivalently, the data rate to be increased. Moreover, missions on which disturbances in the platform attitude are critical can take advantage of a phased array with no moving parts. Although the demonstration model was targeted at a low-Earth-orbit mission, the concept is equally applicable to future interplanetary science missions. View full abstract»

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  • Designing classical offset Cassegrain or Gregorian dual-reflector antennas from combinations of prescribed geometric parameters

    Publication Year: 2002 , Page(s): 114 - 123
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (662 KB)  

    This paper proposes a simple procedure for the design of classical offset Cassegrain or Gregorian dual-reflector antennas from combinations of prescribed geometric parameters. This procedure has already been applied to classical Cassegrain and Gregorian antennas, to classical displaced-axis Cassegrain and Gregorian antennas, and to classical offset Dragonian antennas. The antenna systems can be fully characterized by 21 parameters, of which only five need to be provided by the antenna designer, as the remaining 16 parameters can be derived in closed form using the procedure described here. In this paper, we assume that the main reflector has a circular aperture, while the subreflector has an elliptical aperture All the antenna geometries presented satisfy the Mizugutch condition (1976), which is the geometric-optics condition for zero cross-polarized radiation. This procedure is very close to the one used for offset Dragonian systems, but all the relevant information is repeated here for completeness. View full abstract»

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  • Aspects of the Method of Auxiliary Sources (MAS) in computational electromagnetics

    Publication Year: 2002 , Page(s): 48 - 64
    Cited by:  Papers (54)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1883 KB) |  | HTML iconHTML  

    The method of auxiliary sources (MAS) is a numerical technique, alternative to the standard surface integral-equation formulation, suitable for solving elliptic boundary-value problems appearing in electromagnetic scattering analysis, antenna modeling, waveguide structures, etc. This paper provides an overview of MAS as applied to computational electromagnetics. The fundamentals of MAS are presented and its advantages over the method of moments are highlighted, while special emphasis is given to a number of advanced issues. Moreover, a selection of recent developments in the method is presented, with a detailed description of several challenging topics. Finally, the potential applicability of the method to a broader range of problems is contemplated. View full abstract»

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  • Self-structuring antennas

    Publication Year: 2002 , Page(s): 11 - 23
    Cited by:  Papers (28)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1432 KB) |  | HTML iconHTML  

    This paper introduces a new class of antennas, called self-structuring antennas (SSAs). An SSA has the ability to alter its electrical shape in response to changes in its environment. This property makes an SSA suitable for use in a number of traditionally difficult antenna situations. The basic principles of the SSA are introduced, and a number of potential applications are highlighted. Details of a simple prototype antenna are provided. Computer tools capable of analyzing the SSA are described, and results of both numerical and experimental investigations of the SSA are presented View full abstract»

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  • Smart-antenna systems for mobile communication networks. Part 1. Overview and antenna design

    Publication Year: 2002 , Page(s): 145 - 154
    Cited by:  Papers (54)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1584 KB) |  | HTML iconHTML  

    This paper focuses on the interaction and integration of several critical components of a mobile communication network using smart-antenna systems. This wireless network is composed of communicating nodes that are mobile, and its topology is continuously changing. One of the central motivations for this work comes from the observed dependence of the overall network throughput on the design of the adaptive antenna system and its underlying signal processing algorithms. Part 1 of this two-part paper gives a brief overview of smart-antenna systems, including the different types of smart-antenna systems, and the reason for their having gained popularity. Moreover, details of typical antenna array designs suitable for the wireless communication devices are included in this part. View full abstract»

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  • A color map for effective black-and-white rendering of color-scale images

    Publication Year: 2002 , Page(s): 94 - 96
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (756 KB)  

    Default color maps on color images often reproduce to confusing grayscale images. The proposed color map maintains an aesthetically pleasing color image that automatically reproduces to a monotonic grayscale with discrete, quantifiable saturation levels. View full abstract»

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  • A description and the measured performance of three coaxial beam-rotating antenna prototypes

    Publication Year: 2002 , Page(s): 30 - 47
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2307 KB) |  | HTML iconHTML  

    Many high-power microwave (HPM) sources utilize an azimuthally symmetric output mode, like the TM01 circular waveguide or the coaxial TEM modes. If radiated directly, these modes produce a doughnut-shaped radiation pattern, with a boresight . Mode-conversion techniques for transforming the azimuthally symmetric mode to one with a more desirable radiated pattern are possible, but mode conversion is typically undesirable, due to inefficiencies and due to increases in system size and weight. Antenna designs have been explored that will radiate the azimuthally symmetric mode directly, but those considered to date tend to exhibit low gain, and do not radiate a boresight peak (along the longitudinal axis of the source). This article describes the measured performance of three prototype antennas, all of the coaxial beam-rotating antenna (COBRA) class. These accept directly an azimuthally symmetric mode, and radiate a high-gain, circularly polarized beam with a boresight peak. The antennas achieve this capability by varying the electrical length of a path from a focal point to the aperture plane as a function of the azimuthal angle of the aperture. A brief overview of the general theory of COBRA operation is first presented. Next, measured data, characteristic of the input impedance and far-field patterns of three COBRA prototypes, are given. The architectures of COBRA prototypes reviewed in this article include those utilizing (1) a single, stepped paraboloidal reflector; (2) a dual reflector; and (3) a dual reflector with a coaxial feed. 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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Editor-in-Chief
Mahta Moghaddam