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Antennas and Propagation Magazine, IEEE

Issue 5 • Date Oct. 2000

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Displaying Results 1 - 10 of 10
  • Simple formulas for the calculation of the average physical optics RCS of a cylinder and a flat plate over a symmetric window around broadside

    Publication Year: 2000 , Page(s): 48 - 52
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (329 KB)  

    Closed-form formulas for the arithmetic-average radar cross section (RCS) of a perfectly conducting cylinder and of a perfectly conducting rectangular plate are derived. The derivations proceed under the assumption that the conditions governing the use of the physical optics approximation are satisfied. Examination of the behavior of these formulas reveals simple approximations of very reasonable accuracy. The approximations allow quick and easy evaluation of dynamically collected RCS data in which the scattering phenomenology can be modeled by either a cylinder or a rectangular plate. View full abstract»

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  • The AP-S digital archive

    Publication Year: 2000 , Page(s): 53 - 55
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (288 KB)  

    The AP-S Digital Archive is currently in production, and should be nearing completion by the time this issue reaches readers. The purpose of this article is twofold. First, we want to motivate you to pre-order your copies now!! This will give us important information for deciding how many copies to have made on the initial pressing. Second, we would like to re-acquaint you with the features of the Archive, in case you have forgotten them since development started. We think the Archive project is very exciting, and we believe that you-the AP-S members-will be very pleased with the results. View full abstract»

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  • Scales for rectangular horns

    Publication Year: 2000 , Page(s): 79 - 83
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (276 KB)  

    The scales presented are useful both for design of optimum horns for a given gain, and for finding the gains of rectangular horns from the dimensions. This article further illustrates the relationships among various parameters of rectangular horns. Although the design method started with a waveguide width-to-height ratio of 2:1, the method produces suitable designs for other waveguide ratios. View full abstract»

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  • Specific absorption rates (SARs) induced in head tissues by microwave radiation from cell phones

    Publication Year: 2000 , Page(s): 138 - 139
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (212 KB)  

    The cellular/mobile phone industry has been reluctant to disclose SAR values to the public in the past. The decision by the Cellular Telecommunication Industry Association (CTIA) to require manufacturers to disclose SARs emerged after it became clear that SAR information was going to appear on the FCC Web site in a user-friendly form. It was also prompted by a British government panel's call, on May 11, 2000, for the SAR of each mobile phone to be printed on the box in which the phone is sold. The wireless telephone industry is concerned about how the public may use the SARs, because, according to one industry source, "SARs by themselves may be misleading and variations in SARs do not represent a variation in safety." Indeed, SAR values can vary as a function of the carrier frequency-for example, 850 or 1900 MHz, used to transmit the telephone message-or how the handset is held. The article presents some insights into SAR, what it is, how is it determined, and what it means. View full abstract»

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  • Using a pair of phased antennas to improve UHF reception/transmission in tunnels

    Publication Year: 2000 , Page(s): 40 - 47
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (460 KB)  

    UHF propagation inside tunnels improves considerably if a pair of phased antennas is used as a fixed antenna system, instead of a single antenna. In this article, we have analyzed the causes of signal deterioration in a tunnel due to slow fading and fast fading. We obtained simple relations for their calculation, which are valid for a rectangular tunnel. We then demonstrated that the pair of phased antennas can reduce fast fading. The measurements performed on pilot projects in actual tunnels confirmed that the pair of phased antennas is capable of reducing fast fading, which is usually the real limiting factor for transmission in tunnels. View full abstract»

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  • Development of the Orlan Space-Station antenna

    Publication Year: 2000 , Page(s): 9 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1448 KB)  

    The design of the Crew-Lock antenna for the Russian communication and data system [for the International Space Station] was challenging, because it is enclosed in a conducting shell. In addition, the electromagnetic-field distribution within the Crew Lock is highly constrained by the lowest one or two normal modes of the structure. Two kinds of antennas were investigated to address the requirements: a half loop and a loaded patch. Computer modeling of these approaches was done by the finite-element and moment methods, respectively. The loop antenna underwent extensive scale-model testing, and some full-scale tests at Johnson Space Center in Houston. The patch antenna was eliminated during the full-scale tests. The final design is the "towel-bar" loop, which performs the additional function of a handrail for astronauts during the ingress and egress for extra-vehicular activity (EVA). View full abstract»

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  • High impact management techniques for any project

    Publication Year: 2000 , Page(s): 122 - 124
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB)  

    One does not have to go to days and days of classes to gain important know-how for managing your projects. While aspects of project management are important-work-breakdown structures, scheduling techniques, and project communication among others-a few key techniques can be implemented easily, and bring some huge leverage for finishing projects successfully. This paper offers practical project management "tools" that you-as a project manager, functional manager, or team member-can use immediately. It covers project visions and risk ranking for early testing, and illustrates best practices from other internal and external project teams. View full abstract»

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  • A conformal FDTD software package modeling antennas and microstrip circuit components

    Publication Year: 2000 , Page(s): 28 - 39
    Cited by:  Papers (36)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (820 KB)  

    This paper describes a conformal finite-difference time-domain (CFDTD) software package, and presents its applications to RF antennas and microstrip circuit components. The program includes a Visual Basic GUI, for graphically inputting the object geometries, setting source and boundary conditions, generating a non-uniform mesh, and post-processing of the data. A robust CFDTD technique is employed to handle conductors with curved surfaces and edges. Illustrative examples that show the application of the code for modeling antennas as well as microstrip discontinuities are presented in the paper. View full abstract»

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  • Time-domain vector representation of monopole transient electromagnetic radiation using Maple software

    Publication Year: 2000 , Page(s): 102 - 108
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB)  

    The analytical time-domain vector representation of the transient electromagnetic radiation of a monopole antenna is computed using the Maple software package. This simulation originates directly from the rigorous formulation of the problem via Maxwell's equations. A ramp-function approximation of the antenna excitation current (of arbitrary waveform) is employed. Using the capabilities of Maple, the problem is easily transformed into a compact Maple code. Maple computing enables analytical time-domain three-dimensional vector expressions for the transient radiation field. The fundamental properties of transient radiation are thus characterized qualitatively and quantitatively, assisting with physical interpretation of the results. View full abstract»

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  • Smart antennas in wireless communications: base-station diversity and handset beamforming

    Publication Year: 2000 , Page(s): 142 - 151
    Cited by:  Papers (25)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (748 KB)  

    We review diversity and smart antenna research applied to both base-stations and terminals. To illustrate the performance gains possible, the paper describes research being conducted by the Smart Antenna Group at Virginia Tech, in both smart base-stations and smart handheld terminals. 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