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IEEE Transactions on Antennas and Propagation

Issue 5 • Date May 1988

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Displaying Results 1 - 17 of 17
  • Diffraction of high-frequency waves by a cylindrically curved surface with different face impedances

    Publication Year: 1988, Page(s):690 - 695
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A high-frequency solution is presented to the problem of diffraction of waves generated by a magnetic line source by the edges of a cylindrical curved surface with different face impedances. By taking into account the locality of the high-frequency diffraction phenomena, the mixed boundary value problem is first reduced into a matrix boundary Hilbert-equation and then solved asymptotically by the ... View full abstract»

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  • Measurement and modeling of land mobile satellite propagation at UHF and L-band

    Publication Year: 1988, Page(s):707 - 719
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1052 KB)

    A propagation experiment is described in which a stratospheric balloon served as a transmitter platform at 870 and 1502 MHz in simulation of a land mobile satellite. A vehicle followed the drifting balloon along roads of western Texas and New Mexico, collecting at L -band amplitude and phase, and at UHF amplitude information only for elevation angles between 25° and 45°. The data ... View full abstract»

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  • Electromagnetic scattering by rough conduction circular cylinders. I. Angular corrugation

    Publication Year: 1988, Page(s):651 - 658
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    The coherent and incoherent responses of perfectly conducting, angularly corrugated surfaces (which are infinite circular cylinders on the average) are calculated using a second-order perturbation method. The general approach used is to apply the extinction theorem to write an integral equation for the surface current density, and then to use perturbation theory to solve it. These results are reca... View full abstract»

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  • Bandpass grids with annular apertures

    Publication Year: 1988, Page(s):607 - 611
    Cited by:  Papers (14)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    A rigorous theory is developed for describing the diffraction of a plane wave by a doubly periodic array of annular apertures in a thick, perfectly conducting screen. Coaxial waveguide modes are used to describe the fields within each aperture, while the fields above and below the grid are written as plane wave expansions. Appropriate boundary conditions are applied at the upper and lower surfaces... View full abstract»

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  • High frequency scattering from polygonal impedance cylinders and strips

    Publication Year: 1988, Page(s):679 - 689
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    An analysis is presented for the high-frequency diffraction by convex polygonal cylinders with arbitrary side impedances. The authors extend their solution for the multiply diffracted fields associated with a double wedge (see ibid., vol.36, no.5, p.664-678, 1988). The analysis thus utilizes the extended spectral ray method (ESRM) that is applicable to nonray optical regions. Diffraction coefficie... View full abstract»

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  • Polarization determination utilizing two arbitrarily polarized antennas

    Publication Year: 1988, Page(s):720 - 723
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    Microwave polarimeter systems typically consist of two orthogonally polarized receiving antennas. Formulas for extracting the unknown polarization antennas with known polarization states are presented. Numerical results are generated showing the size of the errors made by assuming perfect orthogonal polarizations (either circular or linear) View full abstract»

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  • Displacement errors in antenna near-field measurements and their effect on the far field

    Publication Year: 1988, Page(s): 581
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (692 KB)

    The effects of probe displacement errors in the near-field measurement procedure on the far-field spectrum are studied. Expressions are derived for the displacement error functions that maximize the fractional error in the spectrum for both the on-axis and off-axis directions. The x- y- and z-displacement error in planar scanning are studied and the results are generaliz... View full abstract»

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  • Conditions for the validity of physical optics in rough surface scattering

    Publication Year: 1988, Page(s):647 - 650
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The statistical properties of random rough surfaces are related to the basic radius-of-curvature condition for applying a physical optics scattering model. The relation between different surface slope regimes and the use of approximate physical-optics models are discussed. Included is how scattering from surfaces with other than small slope conditions restricts the use of such approximations View full abstract»

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  • The effects of the truncation and curvature of periodic surfaces: a strip grating

    Publication Year: 1988, Page(s):612 - 622
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    Equations are outlined for surfaces which are finite and curved in two dimensions (only locally periodic), as well as infinitely periodic in one dimension but truncated and curved in the second dimension. By removing the periodicity, a truncated strip-grating results and the scattered fields as well as an associated reflection coefficient are calculated. These numerically rigorous calculations are... View full abstract»

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  • Radiation from cone-shape flanged open-ended thin-wall circular waveguide

    Publication Year: 1988, Page(s):623 - 628
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The performance of an open-ended circular waveguide with a very sharp cone-shaped flanged termination was measured. These measured results were found to approach those calculated for a semi-infinite open-ended circular waveguide with infinitesimal wall thickness. This analysis is based on L.A. Weinstein's (1969) theory (Wiener-Hopf solution) and sufficient accuracy was obtained to compare results ... View full abstract»

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  • The use of parametric elements in the moment method solution of static and dynamic volume integral equations

    Publication Year: 1988, Page(s):636 - 646
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    The use of two- and three-dimensional parametric curved subdomains (elements) in the numerical solution of electromagnetic problems formulated in terms of volume integro-differential equations is considered, and a technique to evaluate the static and dynamic moment integrals on these domains is presented. In the source region, the evaluation of the moment integrals is performed by separating the i... View full abstract»

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  • Extinction cross section of a dielectric strip

    Publication Year: 1988, Page(s):696 - 706
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    The problem of scattering of a plane electromagnetic wave by a dielectric strip is formulated in terms of an uncoupled system of three-part Wiener-Hopf equations by using a set of approximate boundary conditions. The resulting Wiener-Hopf problems are solved approximately for sufficiently large values of the width of the strip by using D.S. Jones' method (1964). An analytical formula is derived fo... View full abstract»

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  • High frequency scattering by a double impedance wedge

    Publication Year: 1988, Page(s):664 - 678
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    High-frequency diffraction coefficients are presented for up to and including the third-order interaction mechanisms associated with impedance double-wedge structures. The employed formulation is based on the extended spectral ray method (ESRM) accounting for all surface-wave contributions in a rigorous manner. Key identities are provided to enable an efficient asymptotic evaluation of the resulti... View full abstract»

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  • An efficient algorithm and systolic architecture for multiple channel adaptive filtering

    Publication Year: 1988, Page(s):629 - 635
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    A multiple-input-multiple-output orthogonalization algorithm and its efficient systolic implementation are presented. The processing architecture is developed using a basic two-input-two-output decorrelation processing element as the primitive building block. Its features are discussed and compared to the approach of K. Gerlach and F.A. Studer (see ibid., vol.AP-34, no.3, p.458-462, 1986) which is... View full abstract»

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  • Electromagnetic scattering by rough conducting circular cylinders. II. Axial corrugation

    Publication Year: 1988, Page(s):659 - 643
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    For pt.I see ibid., vol.36, no.5, p.651 (1988). The coherent and incoherent responses of conducting axially corrugated surfaces (which are on the average circular cylinders) are calculated. The calculation encompasses second-order perturbation. The general approach used is to apply the extinction theorem to write an integral equation for the surface current density, and then to use the perturbatio... View full abstract»

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  • A dielectric bifocal lens for multibeam antenna applications

    Publication Year: 1988, Page(s):599 - 606
    Cited by:  Papers (22)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    An iteration technique is applied to the design of a bifocal dielectric lens antenna. A bifocal lens has two conjugate off-axis focal points and offers good off-axis scanning performance. A computer model was developed to aid in the design analysis and far-field performance evaluation of a bifocal lens. The computer simulation results demonstrate that the bifocal dielectric lens can provide a high... View full abstract»

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  • Study of the field around the focal region of spherical reflector antenna

    Publication Year: 1988, Page(s):592 - 598
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    V.P. Maslov's (1981) method is applied to derive the expression for the wave reflected by a spherical reflector when the plane wave is incident along the focal axis of the reflector. The expression is reduced to integrals with respect to a single variable. A relatively simple expression is derived which is valid in the caustic region. An asymptotic-ray expression is also derived which can be used ... 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                                                 Kwok W. Leung