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IEEE Transactions on Antennas and Propagation

Issue 1 • January 1982

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Displaying Results 1 - 25 of 27
  • [Front cover and table of contents]

    Publication Year: 1982, Page(s): 0
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    Freely Available from IEEE
  • A low elevation angle propagation measurement of 1.5-GHz satellite signals in the Gulf of Mexico

    Publication Year: 1982, Page(s):10 - 15
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    The current maritime L-band (1.5-GHz) mobile satellite communications service (MARISAT) is not available for communications paths below10degelevation angles because fading and scintillation at low elevation angles introduce signal degradations. These are attributable to scattering, diffraction, and multipath effects arising from ionospheric, tropospheric, and/or sea surface irregulariti... View full abstract»

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  • Radiation from an open-ended waveguide with beam equalizer--A spectral domain analysis

    Publication Year: 1982, Page(s):44 - 53
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (599 KB)

    A septum and an impedance matching post are used as a beam equalizer in an open-ended waveguide feed for reflectors used in satellite communications systems. The performance of this design over a frequency band is evaluated using a spectral domain approach. The computed radiation patterns in theE- andH-planes, as well as the results for the impedance match are presented. View full abstract»

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  • Surface-curvature-induced microwave shadows

    Publication Year: 1982, Page(s):83 - 88
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Ray behavior and the corresponding fields in the vicinity of surface-curvature-induced reflection boundaries are examined and compared with edge-induced reflection boundaries. The slopes of the reflection boundaries vary, respectively, as(lambda)^{-5/6}and(lambda)^{-1/2}. Asymptotic evaluation of the physical optics scattering integrals leads to the definition of equivalent "... View full abstract»

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  • A discussion of various approaches to the identification/approximation problem

    Publication Year: 1982, Page(s):89 - 98
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (845 KB)

    The identification/approximation of a linear system by poles and residues from a measured finite length input-output record of the system is discussed. The objective of this paper is to illustrate that several different formulations for characterizing the impulse response of a system yield the same set of poles. View full abstract»

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  • Adaptive arrays: A new approach to the steady-state analysis

    Publication Year: 1982, Page(s):128 - 138
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (717 KB)

    Our main goal is a closed-form expression for the steady-state output signal-to-noise ratio (SNR) of ann-element adaptive array excited by one desired narrow-band signal andK - 1narrowband jammers. This is facilitated by representing each excitation by a complexn-dimensional vector-the excitation vector. We show that the important system parameters are functions of... View full abstract»

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  • Boresight-gain loss and gore-related sidelobes of an umbrella reflector

    Publication Year: 1982, Page(s):153 - 157
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (517 KB)

    It is shown that energy in the gore-related sidelobes of an umbrella reflector comes from energy lost from the main beam. Both boresight gore-loss and sidelobe level correlate directly with cyclic aperture phase error caused by the geometry. The gore-sidelobe peak is located neartheta_{p}, wheresin theta_{p} = 1.2N_{G} (pi/Dlambda)whereN_{G}is the number of gores a... View full abstract»

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  • Exact gain measurement of large aperture antennas using celestial radio sources

    Publication Year: 1982, Page(s):157 - 161
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (587 KB)

    The correction factors for angular extension of celestial radio sources, Cassiopeia A (Cas A), Taurus A (Tau A), and Cygnus A (Cyg A) were calculated based on the detailed contour maps of brightness temperature. Examinations of the flux densities of those radio sources were made using the published data. The gain of antennas of several sizes measured by using the three radio sources was determined... View full abstract»

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  • Folded and T-matched dipole transformation ratio

    Publication Year: 1982, Page(s):161 - 162
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Accurate curves of impedance transformation ratio for folded dipoles orT-match dipoles with conductors of unequal radii are presented. View full abstract»

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  • Correction to "Dielectric rod leaky-wave antennas for millimeter-wave applications"

    Publication Year: 1982, Page(s): 162
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB)

    First Page of the Article
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  • Comments on the Bojarski identity

    Publication Year: 1982, Page(s): 162
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1982, Page(s): c4
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    Freely Available from IEEE
  • Transmission into staggered parallel-plate waveguides

    Publication Year: 1982, Page(s):35 - 43
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    The modal field transmitted into a staggered parallel-plate waveguide when illuminated by a line source is studied. To widen the limited applicability of existing ray methods, an aperture field integration (AFI) method is developed, in which the field in the waveguide aperture is first calculated by high-frequency techniques (uniform asymptotic theory (UAT) and spectral theory of diffraction (STD)... View full abstract»

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  • Space-time integral equation approach to dielectric targets

    Publication Year: 1982, Page(s):2 - 9
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    A time-domain integral equation technique is presented for computing the response of arbitrarily shaped three-dimensional nondispersive homogeneous dielectric solids. The method is an extension of the previously reported space-time integral equation (STIE) approach to scattering from conducting solids. It consists of the simultaneous solution of four integral equations by a procedure of marching i... View full abstract»

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  • Efficient computation of antenna coupling and fields within the near-field region

    Publication Year: 1982, Page(s):113 - 128
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1504 KB)

    The theory, techniques, details of the important equations, and description of two computer programs are presented for calculating efficiently the mutual coupling at a single frequency between any two antennas arbitrarily oriented and separated in free space. Both programs emphasize efficiency and generality, and require, basically, the complex electric far field of each antenna, and the Eulerian ... View full abstract»

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  • On the integral representation of electromagnetic field vectors

    Publication Year: 1982, Page(s):148 - 153
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    Integral representations of the electromagnetic field vectors are derived by the systematic use of a free-space Green's function and file appropriate Green's theorem. The resulting integrals are in terms of the tangential components of the field vectors at the boundary surface. These representations satisfy Maxwell's equations even for open surfaces, thus additional Kottler's boundary-line charges... View full abstract»

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  • Feed region modes in dipole phased arrays

    Publication Year: 1982, Page(s):66 - 75
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    Feed region modes are derived for a class of dipole phased arrays. The dipole and its balun are a linearly polarized version of the perimeter array radar (PAR) antenna element, and are modeled in strip-line geometry. Knowledge of the feed region modes is essential in determining the influence of supports on the element scan performance, and should shed light on the formation of blind spots in dipo... View full abstract»

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  • Diakoptic theory for multielement antennas

    Publication Year: 1982, Page(s):15 - 26
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    A theory is presented for the analysis of multielement antennas which consist of interconnected, conductive structure elements of electrically small dimensions. The theory is based on the retarded electromagnetic potentials which permit a diakoptic approach to the problem. The antenna is broken up into its individual structure elements. Each element is assumed to be excited by currents which are i... View full abstract»

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  • Ground wave propagation over a mixed path with an elevation change

    Publication Year: 1982, Page(s):139 - 141
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Calculations have been performed for high frequency (HF) ground wave transmission over a mixed path with an abrupt elevation change. The effect of the elevation change is to decrease the field strength at large distances. View full abstract»

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  • Precision experimental characterization of the scattering and radiation properties of antennas

    Publication Year: 1982, Page(s):108 - 112
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    An accurate and simple experimental technique to characterize the scattering and radiation properties of antennas has been developed. The structural scattering constant is determined by the relative amplitude and phase of the radar cross section (RCS) of the antenna. The antenna gain can also be readily obtained from this information and from an absolute calibration for the echo amplitude. In comp... View full abstract»

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  • A statistical raindrop canting angle model

    Publication Year: 1982, Page(s):141 - 147
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    A mathematical model to predict accurately the mean and standard deviation of each drop-size canting angle, assuming Gaussian canting angle distributions, is presented. The model utilizes the one-dimensional energy spectrum of horizontal turbulence given by Davenport. By using the differential equation for the horizontal-drop movement, the mean and standard deviation of each drop-size canting angl... View full abstract»

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  • An alternative approach to linearly constrained adaptive beamforming

    Publication Year: 1982, Page(s):27 - 34
    Cited by:  Papers (966)  |  Patents (91)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    A beamforming structure is presented which can be used to implement a wide variety of linearly constrained adaptive array processors. The structure is designed for use with arrays which have been time-delay steered such that the desired signal of interest appears approximately in phase at the steered outputs. One major advantage of the new structure is the constraints can be implemented using simp... View full abstract»

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  • Unified theory of near-field analysis and measurement: Nonmathematical discussion

    Publication Year: 1982, Page(s):99 - 107
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1160 KB)

    A new unified theory of near-field analysis and measurement emphasizes highly accurate, extremely efficient data processing to yield, e.g., radiation, receiving, and scattering patterns, and absolute gain values. The theory includes 17 types of plane rectangular and plane radial scanning, a more accurate and efficient plane polar scanning, spherical scanning, various types of circular cylindrical ... View full abstract»

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  • Optimization techniques and inverse problems: Reconstruction of conductivity profiles in the time domain

    Publication Year: 1982, Page(s):59 - 65
    Cited by:  Papers (31)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    The iterative probing of an inhomogeneous lossy dielectric slab, whose conductivity is unknown, is discussed. The probing is done in the time domain from the measurements of the field on the interface when this slab is illuminated by a known field. An exact integral formulation is used. Minimization of a cost function, characteristic of the discrepancy between the measured field and the field whic... View full abstract»

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  • Scattering of a dipole field by a moving plasma column

    Publication Year: 1982, Page(s):76 - 82
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The problem of scattering of a dipole field by a plasma column moving uniformly in the axial direction is treated. In order to know the effect of the motion of the plasma on the scattering pattern, first the scattering properties of the dipole field by a stationary plasma with the aid of numerical examples are discussed. In this case two kinds of scattering patterns are illustrated: one in a cross... View full abstract»

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Aims & Scope

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

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Editor-in-Chief                                             Danilo Erricolo