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IEEE Transactions on Antennas and Propagation

Issue 4 • July 1979

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  • [Front cover and table of contents]

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • A combined-source solution for radiation and scattering from a perfectly conducting body

    Publication Year: 1979, Page(s):445 - 454
    Cited by:  Papers (94)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (759 KB)

    A combined-source solution is developed for electromagnetic radiation and scattering from a perfectly conducting body. In this solution a combination of electric and magnetic currents, called the combined source, is placed on the surfaceSof the conducting body. The combined-source operator equation is obtained from theE-field boundary-value equation. It is shown that the solu... View full abstract»

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  • Off-axis cross-polarization and polarization efficiencies of reflector antennas

    Publication Year: 1979, Page(s):460 - 466
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (547 KB)

    Cross polarization in reflector antennas is related to the polarization efficiency. Simple approximate expressions for the peak cross polarization are derived in terms of the polarization efficiency. Front-fed, Cassegrainian, and offset antennas are considered. It is shown that symmetrical antennas have lower peak sidelobes than offset antennas with the same polarization efficiency by approximatel... View full abstract»

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  • Design of a dichroic Cassegrain subreflector

    Publication Year: 1979, Page(s):466 - 473
    Cited by:  Papers (95)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (762 KB)

    The design of a dichroic subreflector for a dual-frequency reflector antenna is described. This antenna consists of aKu-band Cassegrain feed requiring the subreflector surface to be highly reflective at 13-15 GHz and a primary focusS-band feed requiring the subreflector to be transparent at 2.0-2.3 GHz. Such a performance is achieved by a surface of crossed dipoles printed on... View full abstract»

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  • The mean Green's dyadic for a half-space random medium: A nonlinear approximation

    Publication Year: 1979, Page(s):517 - 523
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (435 KB)

    The vector problem of a source embedded in a halfspace random medium is considered, and a zeroth-order solution for the mean Green's dyadic in the nonlinear approximation is derived. This is done by applying a two-variable expansion method to obtain a perturbation solution of the Dyson equation for the mean Green's dyadic. The final results of the dyadic are given in closed form as a corrected eff... View full abstract»

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  • Impulse response of a band-limited lossy ionospheric channel

    Publication Year: 1979, Page(s):548 - 551
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (323 KB)

    Based on dispersion relation of a collisional isotropic uniform plasma, the transfer function of a lossy ionospheric channel was derived. For narrow-band signals, the transfer function can be greatly simplified, and a band-limited impulse response was obtained. It was found that when the collision frequency is only a small fraction ofomega_{0}, the center frequency of the band, an appre... View full abstract»

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  • Pattern measurements of a low-sidelobe horn antenna

    Publication Year: 1979, Page(s):551 - 555
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (514 KB)

    The power pattern of a corrugated horn antenna designed for low sidelobes was measured to levels 90 dB below the main beam maximum in both theE- andH-planes. The measured patterns were found to be in good agreement with theoretical predictions. View full abstract»

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  • Correction to "Electromagnetic modeling of composite wire and surface geometries"

    Publication Year: 1979, Page(s): 570
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (91 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1979, Page(s): c4
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    Freely Available from IEEE
  • Polarizabilities of rectangular dielectric cylinders and of a cube

    Publication Year: 1979, Page(s):557 - 560
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    A previously derived integral representation technique is used to calculate the polarizability of a rectangular dielectric cylinder and of a cube. For the cylinder the results agree well with those of Mei and Van Bladel and for the cube they agree satisfactorily with those of Herrick and Senior. The method is applicable to a wide variety of shapes. View full abstract»

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  • Useful coordinate transformations for antenna applications

    Publication Year: 1979, Page(s):571 - 574
    Cited by:  Papers (45)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    General coordinate transformations which are commonly encountered in many antenna applications are presented. Neither the feed coordinates nor the far-field pattern coordinates in general coincide with the antenna coordinates. Transformations discussed allow one to relate the spherical and Cartesian components of one system to the spherical and Cartesian compoents of the other system. In particula... View full abstract»

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  • Preliminary testing of teflon as a hydrophobic coating for microwave radomes

    Publication Year: 1979, Page(s):555 - 557
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Transmission loss measurements under conditions of simulated rainfall and observed weatherability suggest that Teflon may be a suitable hydrophobic coating for microwave radomes. Teflon performance is compared with fumed silicone dioxide (FSD) and HMOD4, coatings which have been the subject of an earlier detailed study. View full abstract»

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  • A novel radar array and its imaging properties

    Publication Year: 1979, Page(s):567 - 570
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A novel radar array providing resolution superior to any other antenna configuration with the same physical aperture is described. Application of the new array to a localized imaging system suitable for real-time operation is simulated, and its resolution and depth of field properties ate compared with those of a crossed array and the conventional filled array antenna. Substantial savings in weigh... View full abstract»

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  • Dependence of rain attenuation and cross-polarization on drop size distribution

    Publication Year: 1979, Page(s):538 - 542
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Attenuation and cross-polarization due to precipitation are calculated for five drop size distribution functions, namely Laws-Parsons, Marshall-Palmer, Joss drizzle, Joss thunderstorm, and a renormalization of the latter. Propagation paths from the Communications Technology Satellite (CTS) and Comstar D1 synchronous satellites to Ottawa are considered. Clear weather antenna isolation effects are i... View full abstract»

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  • Corrugated waveguide with helically continuous corrugations

    Publication Year: 1979, Page(s):564 - 567
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The cylindrical hybrid mode propagation and radiation characteristics have been theoretically analyzed, and corresponding experimental investigations have been carried out for a corrugated waveguide with helical anisotropy. Under the influence of helical corrugation the plane of polarization of the hybrid mode is found to rotate slowly as it moves along the guide. The frequency dependence of the p... View full abstract»

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  • Wave scattering from error-compensating secondary reflectors

    Publication Year: 1979, Page(s):527 - 530
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Using the Kirchhoff-Huygens-Silver integration technique, amplitude and phase scattering patterns have been computed for secondary mirrors designed to compensate for artificially generated profile errors on the surface of a small paraboloid. The consequences of the frequency-dependent amplitude redistribution across the aperture of the antenna are discussed. View full abstract»

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  • Small antenna location synthesis using characteristic modes

    Publication Year: 1979, Page(s):530 - 531
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    It is shown that the efficiency of a small antenna can be substantially increased by properly locating it on its support structure. Characteristic modes are used to determine the optimum location and frequency. View full abstract»

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  • Analysis of HF pulse reflection from a randomly varying ionosphere

    Publication Year: 1979, Page(s):508 - 516
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    The reflection of high-frequency (HF) pulses by a randomly inhomogeneous, dispersive, and absorbing ionosphere is considered. The distortion of the transmitted pulses due to the intrinsic ionosphere dispersion, multipath effects, and frequency incoherence is related to the spatial, temporal, and frequency dependent characteristics of both the ionosphere and the troposphere. The envelope broadening... View full abstract»

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  • Mode conversion by tunnel nonuniformities in leaky feeder communication systems

    Publication Year: 1979, Page(s):560 - 563
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    Using an idealized theoretical model, the inadvertent mode conversion between the bifilar and monofilar modes are dealt with in a tunnel that contains a braided coaxial cable. The tunnel is allowed to have various kinds of lateral nonuniformities such as changes of wall conductivity and permittivity. We conclude that such effects are very important in understanding leaky feeder systems. View full abstract»

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  • Recent progress in duct propagation predictions

    Publication Year: 1979, Page(s):542 - 548
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    There has been a revived interest in the enhanced radio fields that are encountered in the presence of trapping or dueting atmospheric refractivity gradients either aloft or at and near the surface. Recent progress in the theoretical formulation of ducted fields is summarized, some resulting expressions for interference problems are presented, and those areas still in need of additional developmen... View full abstract»

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  • A nonrectangular patch model for scattering from surfaces

    Publication Year: 1979, Page(s):531 - 535
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    A model is derived for treatment of surfaces using nonrectangular patches. Tests show good agreement, where comparison is possible, with results published elsewhere. The results are shown to be reasonable even in cases where some of the quadrilaterals degenerate to triangles. View full abstract»

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  • An analysis of the elliptical reflector

    Publication Year: 1979, Page(s):455 - 459
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The distribution of the electromagnetic fields diffracted by an elliptical reflector which is fed by a line source at or near one of its two foci is studied. For the elliptic cylinder the magnitude of the fields near the foci, the size of the focal region, the displacement of the focal spot as a function of the source displacement, and the application of the method of stationary phase in calculati... View full abstract»

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  • Scattering properties of satellite-borne solar cell panels

    Publication Year: 1979, Page(s):496 - 499
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Scattering properties in the microwave range of solar cell panels to be used on satellites are experimentally tested both in waveguide and in free space. A grating effect, which affects free-space measurements, is discussed. The results of the study are important in the high-frequency radiation-pattern prediction for satellite antennas. View full abstract»

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  • Multibeam synthetic aperture radar for global oceanography

    Publication Year: 1979, Page(s):535 - 538
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A single-frequency multibeam synthetic aperture radar concept for large swath imaging desired for global oceanography is evaluated. Each beam illuminates a separate range and azimuth interval, and images for different beams may be separated on the basis of the Doppler spectrum of the beams or their spatial azimuth separation in the image plane of the radar processor. The azimuth resolution of the ... View full abstract»

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  • On the use of pseudorandom codes for "Chirp" radar

    Publication Year: 1979, Page(s):480 - 485
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    The effect of transmit/receive (T/R) switching on the amibiguity function of a radar signal whose complex modulation is long compared to the minimum target delay of interest is investigated theoretically, and the theory is then applied to the specific case on an ionospheric "chirp" sounder. Various pseudorandom T/R codes are compared for their suitability for this particular radar application, and... View full abstract»

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IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas.

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Editor-in-Chief                                             Danilo Erricolo