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IEEE Transactions on Antennas and Propagation

Issue 9 • Date September 1987

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Displaying Results 1 - 16 of 16
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): 0
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    Freely Available from IEEE
  • Wire grid modeling of surfaces

    Publication Year: 1987, Page(s):1045 - 1048
    Cited by:  Papers (54)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    When a surface is numerically modeled with a wire grid, results are sensitive to the wire diameter. It is shown that the best accuracy is obtained when the wire satisfies the "same surface area" rule of thumb, for the canonical problem of scattering (or radiation) from an infinite circular cylinder. It is important to note that wires that are too thick are just as bad as wires that are too thin. I... View full abstract»

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  • An improved thinning method for density tapering of planar array antennas

    Publication Year: 1987, Page(s):1066 - 1070
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A thinning method is presented to realize the desired aperture distribution in a planar array antenna with elements fixed on an array lattice. In this method elements to be excited are determined by quantizing cumulative weights which are calculated from the desired aperture distribution. At first, this method is applied to density tapering on orthogonal axes of a planar array. Radiation patterns ... View full abstract»

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  • A note on the relationship between the conjugate gradient method and polynomials orthogonal over the spectrum of a linear operator

    Publication Year: 1987, Page(s):1089 - 1091
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The relationship between the conjugate gradient method and polynomials orthogonal over the spectrum of a linear operator is discussed. It is shown that as a byproduct of the conjugate gradient construction, two sets of polynomials are generated which are orthogonal with respect to a positive real measure over the spectrum of a self-adjoint operator. The roots of these polynomials can, under certai... View full abstract»

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  • The hat feed: A dual-mode rear-radiating waveguide antenna having low cross polarization

    Publication Year: 1987, Page(s):1010 - 1016
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The hat antenna is a new self-supported rear-radiating waveguide feed, related to existing feeds known as splashplate and waveguide cup antennas. An analytical model for the radiation pattern of the hat antenna, a model which includes the axial waveguide itself is presented. This model shows that by exciting the feed with two modes it is possible to use the waveguide constructively as one of the d... View full abstract»

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  • Steerable ELF/VLF radiation produced by an array of ionospheric dipoles generated from HF heating

    Publication Year: 1987, Page(s):1022 - 1030
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    A very low frequency (VLF) or extremely low frequency (ELF) dipole source has been created within the lower ionosphere by modulating the atmospheric dynamo currents with a ground-based high power HF source from the Arecibo Observatory. The authors and their colleagues have demonstrated that ELF or VLF generated in this way and injected into the earth-ionosphere waveguide could be received a few th... View full abstract»

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  • The strip-loaded hybrid-mode feed horn

    Publication Year: 1987, Page(s):1086 - 1089
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A novel typed of hybrid-mode feed horn is presented. It comprises a hollow conical dielectric waveguide whose outer surface is metallized, and whose inner surface is coated with circumferentially oriented conducting strips. It may be designed to have mimimal cross polarization at two arbitrarily separated frequencies, as for a dual depth corrugated horn. Compared to the corrugated horn, it has the... View full abstract»

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  • Complex rays for radiation from discretized aperture distributions

    Publication Year: 1987, Page(s):1031 - 1044
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1040 KB)

    Many electromagnetic propagation problems require tracking of fields radiated by large actual or induced aperture distributions through complicated environments before reaching the observer. For a systematic approach to this problem area, it is desirable to represent the aperture field in terms of basis functions which are physically informative and well adapted to traversing the propagation path.... View full abstract»

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  • Resonant electromagnetic field coupled into a lossy cavity through a slot aperture

    Publication Year: 1987, Page(s):1074 - 1077
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A new approach is proposed for determining the electromagnetic fields coupled from an incident plane wave into a lossy conducting cavity through a slot aperture under resonant conditions. Use is made of the duality between a slot and a conducting strip and of the equivalence between a strip and a wire. Simplified formulas are derived that are explicit and flexible. Determination of resonant fields... View full abstract»

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  • Jacobi-Bessel analysis of reflector antennas with elliptical apertures

    Publication Year: 1987, Page(s):1070 - 1074
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Although many reflector antennas possess circular projected apertures, there are recent satellite and ground antenna applications for which it is desirable to employ reflectors with elliptical apertures. Here a modification of the Jacobi-Bessel expansion is presented for the diffraction analysis of reflectors with elliptical apertures. A comparative study is also performed between this modified Ja... View full abstract»

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  • Optimal design of multiply fed dipole antennas

    Publication Year: 1987, Page(s):1001 - 1009
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    The gain of a mulitply fed dipole antenna of length L , small radius a and arbitrary locations of feed voltages along the antenna is computed using the well-known moment method. An optimization routine is then employed to study the possibility of maximizing the gain in a specified angular direction and minimizing it at other... View full abstract»

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  • Analytic expressions for a function occurring in diffraction theory

    Publication Year: 1987, Page(s):1083 - 1086
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Simple expressions are derived for the Maliuzhinets (integral) function which arises in connection with diffraction by an impedance wedge. The given expressions allow the computation of the function with remarkable accuracy throughout the entire complex plane for any exterior wedge angle. View full abstract»

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  • Analysis of the tapered slot antenna

    Publication Year: 1987, Page(s):1058 - 1065
    Cited by:  Papers (92)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    A method for calculating the radiation pattern of end-fire tapered slot antennas with or without dielectric substrate is presented. The method involves a two-step procedure: 1) determine the field distribution of a traveling wave along the tapered slot, and 2) compute the radiation from this slot field by using the half-plane Green's function to account for termination effects. Acceptable estimate... View full abstract»

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  • Two-dimensional beam diffraction by a half-plane and wide slit

    Publication Year: 1987, Page(s):1077 - 1083
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    The far field of a two-dimensional beam resulting from an electric line source at a complex position is described, its half-power beamwidth determined, and its validity as an antenna beam indicated. Farfield diffraction by a half-plane is then determined from an exact uniform solution for an isotropic line source by making the source position complex. The same basic solution and technique are used... View full abstract»

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  • Sidelobe suppression of planar array antennas by the multistage decision method

    Publication Year: 1987, Page(s):1017 - 1021
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The sidelobe level of a planar array antenna with equal amplitude excitation can be suppressed by element thinning. The method of element thinning employed here is a kind of multistage decision procedure or steepest descent approach. Although this method gives the local optimum results, the reduced sidelobe level is assured to be within the obtained level over the whole radiation region. The sidel... View full abstract»

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  • The backscattered field of a thin wire loop for H-polarization

    Publication Year: 1987, Page(s):1049 - 1057
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    For a thin wire loop illuminated by a plane electromagnetic wave, the backscattered field is determined when the incident magnetic vector is parallel to the plane of the loop. The complete second-order geometrical theory of diffraction (GTD) solution is obtained and found to be in excellent agreement with numerical data at angles close to normal incidence on the loop. At wide angles, however, the ... 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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Meet Our Editors

Editor-in-Chief                                                 Kwok W. Leung