IEEE Transactions on Antennas and Propagation

Issue 1 • January 1987

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Displaying Results 1 - 22 of 22
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): 0
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    Freely Available from IEEE
  • Editorial board

    Publication Year: 1987, Page(s):2 - 4
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  • A bandwidth enhancement method for microstrip antennas

    Publication Year: 1987, Page(s):5 - 12
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (582 KB)

    Bandwidth enhancement methods for electromagnetically coupled microstrip dipoles are discussed. It is demonstrated that if parasitic metallic strips are incorporated in the structure either co-planar and parallel to the embedded microstrip transmission line open end, or between the transmission line and the microstrip dipole, then substantial bandwidth enhancement results. Experimental verificatio... View full abstract»

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  • Broad-band characteristics of rotationally symmetric antennas and thin wire constructs

    Publication Year: 1987, Page(s):26 - 32
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (462 KB)

    The rotationally symmetric monopole antenna is given by a set of simultaneous equations on the rotationally symmetric surface current of a conductor, separated with respect to the variable of the envelope length on the surface of the rotationally symmetric antenna and the variable in the direction of revolution. The structure is analyzed in detail by means of an extended moment method based on the... View full abstract»

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  • Near-field gain of a horn and an open-ended waveguide: Comparison between theory and experiment

    Publication Year: 1987, Page(s):33 - 40
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (695 KB)

    Generating a standard electromagnetic field requires knowledge of the gain of the transmitting antenna. The theory and supporting experimental measurements of the near-field gain of a pyramidal horn and an open-ended waveguide (OEG) at 450 MHz are given. The empirical near-field gain for the OEG is derived from experimental results obtained by a two-antenna method at about 2 GHz. The theoretical n... View full abstract»

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  • Deconvolution of the impulse response of a conducting sphere by the conjugate gradient method

    Publication Year: 1987, Page(s):105 - 110
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (531 KB)

    An experimental technique for determining the impulse response of a conducting sphere has been presented. A method of exciting and recording transient waveforms scattered from conducting spheres of various sizes has been described and extensively tested. A modified conjugate-gradient method has been applied to the transient waveforms to determine the impulse response of the objects. It is shown th... View full abstract»

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  • Comparison of UTD and UAT in axially symmetric reflectors

    Publication Year: 1987, Page(s):113 - 116
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (386 KB)

    Radiation patterns of focus-fed axially symmetric reflector antennas are determined by using the uniform geometrical theory of diffraction (UTD) and the uniform asymptotic theory (UAT). The calculations are based on a computer program, which can determine the radiation pattern of any conic-section-generated reflector with arbitrary eccentricity. Comparison of the radiation patterns inE-... View full abstract»

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  • [Back cover]

    Publication Year: 1987, Page(s): c4
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    Freely Available from IEEE
  • Remote detection of a thin slit in a thick ground plane

    Publication Year: 1987, Page(s):116 - 120
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (408 KB)

    A method for detecting a thin slit in a thick ground plane is discussed. The method is based upon detecting the slit resonances which occur when the thickness of the ground plane is approximately an integer order of half-wavelengths. A theoretical model for the scattering from a two-dimensional slit by a short current element is also described. Both theory and experiment display the slit resonance... View full abstract»

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  • Resolution of a controversy surrounding the Kirchhoff approach and the small perturbation method in rough surface scattering theory

    Publication Year: 1987, Page(s):120 - 122
    Cited by:  Papers (56)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (248 KB)

    It is shown that the small amplitude limit of the mean backscatter cross section for a perfectly conducting random rough surface calculated from the first two terms in the iterative series solution of the surface current integral equation gives the same results as the small perturbation method. This demonstration resolves a long-standing controversy in rough surface scattering theory. View full abstract»

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  • On the resonant frequencies of the triangular patch antenna

    Publication Year: 1987, Page(s):100 - 101
    Cited by:  Papers (63)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (192 KB)

    The appropriate correction factor to use in the resonant frequency formula of an equilateral triangular patch antenna obtained from the cavity model with perfect magnetic walls is discussed. View full abstract»

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  • Comparison of induced current and aperture field integrations for an offset parabolic reflector

    Publication Year: 1987, Page(s):101 - 105
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (328 KB)

    The fields predicted by integration of the physical optics induced currents on the reflector (ICM) and the geometrical optics aperture fields (AFM) on the surface that caps the reflector are compared numerically for offset parabolic reflectors. It is found that the AFM solutions are very close to ICM solutions for the main beam and the first few sidelobes but discrepancy remains for the far-out si... View full abstract»

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  • Numerical computation of diffraction coefficients

    Publication Year: 1987, Page(s):53 - 61
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (824 KB)

    Direct numerical methods are explored for the computation of diffraction coefficients for a wide class of canonical structures. Although these canonical structures are infinite or semi-infinite, the initial computations are performed on finite bodies. Extraction of the desired coefficient therefore necessitates the elimination of radiation from extraneous diffraction centers. This is accomplished ... View full abstract»

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  • A polarimetric model for the recovery of the high-frequency scattering centers from bistatic-monostatic scattering matrix data

    Publication Year: 1987, Page(s):87 - 93
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (616 KB)

    The objective of this investigation is to develop multistatic electromagnetic identification/discrimination algorithms using the complete polarimetric scattering data. At high frequencies the electromagnetic scattering from a complex object is modeled by certain scattering centers. The high-frequency (physical optics) bistatic and monostatic scattering matrix properties of a flat plate model of su... View full abstract»

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  • The equivalent separation(s) for the self-impedance of thin strips

    Publication Year: 1987, Page(s):110 - 113
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (384 KB)

    The concept and computation of the equivalent separation and separations, which are useful in the evaluation of the self-impedance of an electrically thin strip of current, are described. The self-impedance involves the evaluation of an integral with a singular integrand. Using the concepts of equivalent filament separation and separations, it is shown that the self-impedance of the thin strip is ... View full abstract»

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  • Radiation impedance of a dipole printed on periodic dielectric slabs protruding over a ground plane in an infinite phased array

    Publication Year: 1987, Page(s):13 - 25
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1152 KB)

    The radiation impedance of a dipole printed on periodic dielectric slabs standing over a ground plane in an infinite phased array is calculated. The calculation is made by means of modal expansions in terms of longitudinal section electric (LSE) and longitudinal section magnetic (LSM) modes. Derivations of these hybrid space modes and development of the modal expansions are presented first. The im... View full abstract»

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  • Diffraction by a thick perfectly conducting half-plane

    Publication Year: 1987, Page(s):62 - 72
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (864 KB)

    The angular spectrum method involves the integral representation of the scattered field in terms of the angular spectra of the pertinent surface currents. Here the angular spectrum method in conjunction with the scattering matrix formulation is used for the diffraction analysis of a thick perfectly conducting half-plane considering both polarizations of incidence. Of particular interest is the sca... View full abstract»

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  • Scattering by a ferrite-coated conducting sphere

    Publication Year: 1987, Page(s):73 - 79
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (520 KB)

    The theory for scattering by a perfectly conducting sphere with a coating of lossy, homogeneous, isotropic ferrite material is presented. In addition to the rigorous eigenfunction formulation, the physical optics (PO) and geometrical optics (GO) approximations are also included. Numerical results are shown in graphical form to illustrate the backscatter echo area versus the radius of the sphere, a... View full abstract»

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  • Angles-of-arrival and tropospheric multipath microwave propagation

    Publication Year: 1987, Page(s):94 - 99
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (528 KB)

    A wide-aperture vertical array is described, the function of which is to determine experimentally the angle-of-arrival and amplitude of individual rays during tropospheric multipath propagation. The primary objective is to provide high-resolution estimates both in measured values and in time. Some experimental results are presented indicating that under such conditions, several rays are generated ... View full abstract»

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  • Spectral domain analysis of electromagnetic wave scattering by an infinite plane metallic grating

    Publication Year: 1987, Page(s):46 - 52
    Cited by:  Papers (44)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (576 KB)

    A new method, based on the spectral domain analysis, is presented for solving the electromagnetic wave scattering by an infinite plane metallic grating. The key point of the present method is discretization of spectral formulation in terms of the sampling theorem. Two different polarizations, transverse magnetic (TM) and transverse electric (TE) excitations, are considered here. Accuracy of the pr... View full abstract»

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  • Weakly dispersive spectral theory of transients, part I: Formulation and interpretation

    Publication Year: 1987, Page(s):80 - 86
    Cited by:  Papers (71)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (704 KB)

    Dispersive effects in transient propagation and scattering are usually negligible over the high frequency portion of the signal spectrum, and for certain configurations, they may be neglected altogether. The source-excited field may then be expressed as a continuous spatial spectrum of nondispersive time-harmonic local plane waves, which can be inverted in closed form into the time domain to yield... View full abstract»

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  • The annular aperture antenna with a hemispherical center conductor extension

    Publication Year: 1987, Page(s):41 - 45
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (464 KB)

    An annular aperture antenna mounted on an infinite ground plane and containing a hemispherical center conductor extension above the ground plane is investigated. A Green's function for the region above the ground plane is derived so as to be compatible with numerical solution techniques. A magnetic field integral equation is obtained in terms of the unknown tangential aperture electric field and i... View full abstract»

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Aims & Scope

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

Full Aims & Scope

Meet Our Editors

Editor-in-Chief                                             Danilo Erricolo