IEEE Transactions on Antennas and Propagation

Issue 1 • January 1972

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Displaying Results 1 - 25 of 35
  • [Front cover and table of contents]

    Publication Year: 1972, Page(s): 0
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    Freely Available from IEEE
  • First-order theory and analysis of MF/HF/VHF scatter from the sea

    Publication Year: 1972, Page(s):2 - 10
    Cited by:  Papers (258)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1002 KB)

    Scatter from the sea near grazing from MF through VHF is analyzed in this paper. Results based on the compensation theorem show that the dependence upon the grazing angles, as well as upon frequency, range, and the effective surface impedance, can be removed for vertical polarization as the familiar "Norton attenuation factors." Time variation of the surface is included, and results are derived fo... View full abstract»

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  • Compensation of spherical reflector aberrations by planar array feeds

    Publication Year: 1972, Page(s):49 - 56
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (709 KB)

    The feasibility of correcting phase aberrations of spherical reflector antennas with planar array feeds has been investigated. This type of feed seems to be particularly attractive for applications requiring several closely spaced beams. A synthesis procedure for the array excitation has been developed which minimizes the mean-square error with respect to a prescribed reflector illumination. This ... View full abstract»

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  • Design and performance of four buried UHF antennas

    Publication Year: 1972, Page(s):56 - 62
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (766 KB)

    As a result of a 10-month study by the Institute for Telecommunication Sciences, four UHF antennas were designed and fabricated, and their absolute power gains for elevation angles from1degto45degand azimuthal patterns at5degelevation angle were measured with each antenna buried beneath 1 m of refractory concrete. Relative response of the four antennas, placed in s... View full abstract»

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  • Reflection from the aperture of a longE-plane sectoral horn

    Publication Year: 1972, Page(s):62 - 68
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (623 KB)

    The complex reflection coefficient of a longE-plane sectoral horn is derived using the geometrical theory of diffraction. Single diffraction alone is shown to be sufficient to describe the contribution from theE(widely separated) edges, while singly and doubly diffracted fields from theHedges are included by using an open waveguide result derived elsewhere. A relat... View full abstract»

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  • Aperture efficiency enhancement in dielectrically loaded horns

    Publication Year: 1972, Page(s):69 - 74
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The effect of symmetrically loading a horn aperture withE-plane dielectric slabs is examined both theoretically and experimentally. It is shown that aperture efficiencies of the order of 92-96 percent may be obtained easily and inexpensively. The technique, which was demonstrated experimentally for a small horn aperture, might find application in limited scan arrays. View full abstract»

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  • Admittance of a half-wavelength slot antenna radiating into a warm lossy two-layer plasma

    Publication Year: 1972, Page(s):75 - 76
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (178 KB)

    The admittance of a half-wavelength slot antenna in a two-layer lossy plasma is shown to be greatly affected by moderate electron temperatures (T_{e} leq 1 eV) when the plasma is overdense. The effects of slot width and electron collision frequency upon the slot admittance also are investigated. View full abstract»

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  • Computations of the aperture admittance of an axial slot on a dielectric coated cylinder

    Publication Year: 1972, Page(s):89 - 92
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (541 KB)

    An extensive set of curves for the aperture admittance of a waveguide-fed axial slot on a coated metal cylinder is presented for both an underdense plasma and a Teflon coating. Examination of these curves shows that a slot on a cylinder with aKaof 2 to 3 has about the same aperture admittance as the identical slot opening onto a flat ground plane. View full abstract»

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  • A broad-banded folded monopole antenna

    Publication Year: 1972, Page(s):92 - 94
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (358 KB)

    Electrically short folded monopole antennas with lumped mutual coupling between driven and folded sections are considered, showing that the input radiative impedance exhibits a resonance frequency depending upon the sign and magnitude of the coefficient of coupling. If extended to "n-folded" monopoles with separate lumped mutual couplings, the analysis shows the input radiative impedanc... View full abstract»

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  • A dielectric-loaded circular waveguide antenna

    Publication Year: 1972, Page(s):96 - 97
    Cited by:  Papers (16)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (182 KB)

    A highly directive antenna of simple and lightweight structure is designed and tested experimentally. It consists of a dielectric rod with conical hole loading an open-ended circular waveguide. The test has shown that three different radiation patterns can be obtained depending on the depth of penetration of the rod inside the waveguide. Also an improvement on the axial gain can be obtained when t... View full abstract»

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  • Experimental results of a multifrequency array antenna

    Publication Year: 1972, Page(s):106 - 107
    Cited by:  Papers (14)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (223 KB)

    An array antenna containing three arrays of interlaced radiating elements with operating frequencies inL, S, andCbands are described. Measured results include radiation patterns, crosspolarization data, gain, impedance, and mutual coupling measurements. The interlacing of elements of different arrays into a single aperture is shown to be feasible. Mutual interaction between a... View full abstract»

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  • Comments on "On a new condition for physical realizability of planar antennas"

    Publication Year: 1972, Page(s):113 - 114
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1972, Page(s): c4
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    Freely Available from IEEE
  • Input impedance of a dipole antenna above a conducting half space

    Publication Year: 1972, Page(s):86 - 89
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The derivation of an expression for the change in free space input impedance of a finite horizontal dipole, due to the proximity of a conducting half space, is outlined. The impedance change is expressed in a conveniently computable form in terms of the Fourier transform of the antenna current distribution. Using available transforms some typical results are shown over a 50:1 frequency range. View full abstract»

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  • Temporal frequency spectra of multifrequency waves in turbulent atmosphere

    Publication Year: 1972, Page(s):10 - 19
    Cited by:  Papers (78)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    General formulations for temporal frequency spectra of the fluctuations of plane, spherical, and beam waves operating at two frequencies are given based on weak turbulence and frozen-in assumptions. The cross spectra and the coherence are obtained for the amplitude at two frequencies, the phase at two frequencies, and the amplitude at one frequency and the phase at another frequency. The results a... View full abstract»

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  • IEEE standards publications and activities of interest to G-AP membership

    Publication Year: 1972, Page(s):1 - 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    First Page of the Article
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  • Diffraction coefficients for a slot-excited conical antenna

    Publication Year: 1972, Page(s):40 - 49
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    First-order diffraction coefficients for a slot-excited conical antenna are calculated, beginning with integral expressions for the radiation field. Simple formulas based on these coefficients are presented for the radiation patterns that correctly reproduce the interference structure as well as predict the magnitude of the field down to quite low frequencies. Plots of the diffraction coefficients... View full abstract»

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  • The scattering from curved rough surfaces of an EM wave transmitted through a turbulent medium

    Publication Year: 1972, Page(s):19 - 30
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1128 KB)

    A generalized analysis of electromagnetic (EM) wave scattering from rough surfaces yields an expression for mean scattered power flux which is the spatial Fourier transform of the product of three transfer functions: 1) the optical transfer function (OTF) of the propagating medium; 2) the joint characteristic function of the surface roughness; and 3) a coherence involving the mean surface and the ... View full abstract»

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  • Phase and group velocity in a drifting magnetoplasma

    Publication Year: 1972, Page(s):77 - 78
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    Relationship between group and phase velocities of electromagnetic waves in a drifting uniaxial plasma is discussed. When determining whether propagation between two points is possible, the allowed direction of the group velocity vector and not that of the phase velocity vector is important. View full abstract»

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  • A basis transformation technique with application to scattering by wires

    Publication Year: 1972, Page(s):80 - 82
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A numerical basis transformation technique is described which may be applied, in conjunction with point-matching methods (e.g., piecewise uniform or piecewise linear methods), to obtain least-square solutions of electromagnetic scattering by thin wires. It is shown that reductions in both computer solution time and computer storage requirements result. The technique is demonstrated by applying it ... View full abstract»

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  • An effective medium description for a random uniaxial anisotropic medium with small-scale fluctuations

    Publication Year: 1972, Page(s):110 - 112
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Some properties of the electromagnetic field are determined for an unbounded medium characterized by a permittivity tensor whose elements can be expressed as the sum of two terms, one deterministic and the other random. The deterministic and random parts of the permittivity tensor are considered to be uniaxial anisotropic; thus it is a diagonal tensor where two of the three elments are equal. Star... View full abstract»

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  • A novel small array technique for active phased array impedance measurement

    Publication Year: 1972, Page(s):107 - 110
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A modified small array technique for measuring both amplitude and phase of the active reflection coefficient is described. The method which does away with corporate feeding and phase shifters utilizes space feeding and employs a slotted line in the central element. Measurements on an 11 by 11 element array indicate feasibility of the method for simulation of large arrays. View full abstract»

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  • Sidelobe control of antenna patterns

    Publication Year: 1972, Page(s):102 - 104
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Using the iterative sampling method, sidelobe peaks can be made to conform to a specified shape within a given tolerance. The iterative sampling method allows the specifications for a given problem to be just satisfied, thereby avoiding an overdesigned pattern which may have a complicated current distribution or wide main beam. The type of calculations involved are typically only summations of ser... View full abstract»

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  • Nonseparable pattern of planar arrays

    Publication Year: 1972, Page(s):104 - 106
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    It is shown that nonseparable pattern of planar array including hexagonal lattice array is obtained by using linear array pattern. The nonseparable pattern can be the same structure as pattern of any linear array. View full abstract»

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  • Comparison of square array directivity formulas

    Publication Year: 1972, Page(s):100 - 102
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Directivity of rectangular planar arrays is often approximated using the directivity of two constituent linear arrays, either of dipoles or isotropic elements. A result has been derived for directivity of a rectangular planar array of short dipoles (in the plane of the array) using a method from Forman. The severe approximate directivity calculations are compared with this more accurate result. Cu... View full abstract»

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

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Meet Our Editors

Editor-in-Chief                                             Danilo Erricolo