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IEEE Transactions on Antennas and Propagation

Issue 4 • July 1977

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  • [Front cover and table of contents]

    Publication Year: 1977, Page(s): 0
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    Freely Available from IEEE
  • Comments on "Study by conformal mapping of TE and TM waves in open dielectric waveguides

    Publication Year: 1977, Page(s):593 - 595
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (323 KB)

    Significant conceptual errors appear in a recent analysis of various open dielectric waveguides by conformal mapping of the H - guide configuration. Probable reasons for the failure are suggested and a corrected development of the technique is outlined. View full abstract»

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  • Electromagnetic pulse propagation in a weakly nonlinear plasma

    Publication Year: 1977, Page(s):587 - 589
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    An investigation of the propagation of electromagnetic pulses in a weakly nonlinear, cold, collisionless plasma is described. It is found that a transverse electromagnetic pulse generates, through nonlinear effects, a small amplitude, longitudinal electric pulse field. The transient behavior of this longitudinal electric field is studied. One particular case is considered in detail: the nonlinear ... View full abstract»

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  • Synthetic radar imagery

    Publication Year: 1977, Page(s):477 - 483
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    A method for producing three-dimensional isometric images of a conducting radar target from measured ramp response waveforms is tested for the case of nonmutually orthogonal viewing angles. It is found that, in general, image quality is somewhat degraded and several new parameters are introduced, but useful images can still be obtained. Methods for obtaining the new parameters are included as well... View full abstract»

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  • Electromagnetic fields of dipoles in stratified media

    Publication Year: 1977, Page(s):547 - 552
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    A general theory for the electromagnetic fields of dipoles in stratified isotropic media is outlined. The stratified model consists of a stack of layers sandwiched between two semi-infinite media. Either an electric or a magnetic dipole can be placed at any position in the stack, or in the upper or lower half-space. Dipoles can be electric or magnetic and can be oriented horizontally or vertically... View full abstract»

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  • Collision frequencies of raindrops

    Publication Year: 1977, Page(s):583 - 585
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Using an exponential model spectrum for raindrop sizes, calculations are made of how often raindrops collide with one another. The collision of a large drop with another occurs after an interval of a few seconds. Large drops are likely to be markedly aspherical, and to oscillate, rather than to follow collectively a mean canting angle. Such variabilities should be considered in calculating depolar... View full abstract»

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  • Scattering by arbitrarily cross-sectioned layered, lossy dielectric cylinders

    Publication Year: 1977, Page(s):518 - 524
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    The scattering properties of TM or TE illuminated lossy dielectric cylinders of arbitrary cross section are analyzed by the surface integral equation techniques. The surface integral equations are formulated via Maxwell's equations, Green's theorem, and the boundary conditions. The unknown surface fields on the boundaries are then calculated by flat-pulse expansion and point matching. Once the sur... View full abstract»

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  • The receive voltage transmission function of a phased array antenna element

    Publication Year: 1977, Page(s):542 - 547
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A general method has been developed for determining the voltage response of a phased array element to an incoming electric field. The incident field may arrive from any scan angle, and mutual coupling effects are accounted for in terms of the array element active reflection coefficient. The method defines a receive voltage transmission function \bar{T}(\theta,...
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  • A note on the asymptotic physical optic solution to the scattered fields from a paraboloidal reflector

    Publication Year: 1977, Page(s):531 - 534
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The asymptotic physical optic (APO) formulation for the scattered fields from a paraboloid has been found to give results which agree with experiment except in the rear region. The disagreement here is due to the inexact nature of the assumed geometric optic (GO) edge currents as used in APO. A means of correcting for the error in these currents is given here by appealing to the equivalent half pl... View full abstract»

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  • Scattering by a dielectric wedge: A numerical solution

    Publication Year: 1977, Page(s):570 - 571
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    A numerical method is presented for the scattering by a general penetrable wedge. A set of coupled integral equations may be forumlated from Maxwell's equations, Green's theorem, and boundary conditions. The numerical solutions to the unknown surface fields on the boundary are first obtained by flat-pulse expansion for the fields near the tip and physical optics fields away from the tip and then p... View full abstract»

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  • Comparison of Romberg and Gauss methods for numerical evaluation of two-dimensional phase integrals

    Publication Year: 1977, Page(s):581 - 583
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The relative performance, considering both accuracy and time, of the Romberg and the Gauss-Legendre methods as applied to numerical evaluation of two-dimensional phase integrals is presented. View full abstract»

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  • Fourier transforms in propagation and scattering problems

    Publication Year: 1977, Page(s):585 - 586
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Three-dimensional Fourier transforms are applied to electromagnetic wave propagation problems. After obtaining functions in transform space, inversion and contour integration yield a plane wave integral representation. View full abstract»

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  • Field behavior near anisotropic and multidielectric edges

    Publication Year: 1977, Page(s):571 - 575
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Field behavior near edges involving an anisotropic medium and edges involving three isotropic dielectrics is analyzed. Equations are presented which relate this behavior to the geometry and the electrical properties of the media surrounding the edge. It is found that for the three-dielectric configuration, geometric singularities do not necessarily imply field singularities. View full abstract»

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  • Mathematical models for the reflection coefficients of lossy dielectric half-spaces with application to transient responses of chirped pulses

    Publication Year: 1977, Page(s):490 - 495
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Reflection coefficients are found at normal incidence for a large class of homogeneous lossy half-spaces with a one-dimensionally inhomogeneous or stratified lossy layer on top. Solutions are in terms of Hankel functions of complex argument to decrease cancellation error at high frequencies. One special case is that of layers on a homogeneous half-space where the dielectric constant in each layer ... View full abstract»

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  • Near-field distribution of a paraboloidal reflector

    Publication Year: 1977, Page(s):589 - 590
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    A major problem in communication antenna design is to obtain maximum gain and efficiency from large reflector antennas; few paraboloidal or dish antennas have efficiencies greater than 70 percent. The basic problem is the spreading of power by the source feed located at or near the focus of the reflector, which causes a concentration of power near the center of the aperture. In order to determine ... View full abstract»

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  • The excitation of current on an infinite horizontal wire above earth by a vertical electric dipole

    Publication Year: 1977, Page(s):560 - 565
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The formal solution to the problem of finding the current induced on a horizontal wire above earth by a vertical electric dipole is given. A simple solution for the case where the dipole is electrically distant from the wire is developed. The interpretation and restrictions of this solution are discussed. View full abstract»

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  • The reduction of interference from large reflecting surfaces

    Publication Year: 1977, Page(s):565 - 570
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The use of corrugated surfaces to reduce interfering reflections from buildings, in particular instrument landing system (ILS) interference from hangars near airport runways, is proposed. A numerical examination of the infinite comb grating under H -polarized plane wave illumination with grating spacing \lambda /2 < a < \la...
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  • Satellite site diversity: Results of a radiometer experiment at 13 and 18 GHz

    Publication Year: 1977, Page(s):483 - 489
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    Joint attenuation statistics for a model site-diversity satellite system which would operate at 18 and 30 GHz were gathered in a radiometer experiment conducted at sites near Atlanta, GA, and Denver, CO. The receiver is of the classic Dicke radiometer type, monitoring sky-noise power at 13.6 and 17.8 GHz. Scaling provides the means to derive 30 GHz performance. The experiment, which commenced in M... View full abstract»

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  • A system for on line imaging of scattering centers on rotating radar targets

    Publication Year: 1977, Page(s):592 - 593
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    A simple measurement and data processing system is presented which, at the output, on a television screen, continuously and on line yields a one-dimensional radar image of rotating targets together with the corresponding two-dimensional optical image. The system makes use of the well-known fact that the fine structure in the instantaneous Doppler spectrum of the radar echo from a rotating target y... View full abstract»

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  • An antenna beam modeling algorithm

    Publication Year: 1977, Page(s):534 - 539
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    A parametric model is presented in this paper which characterizes the beam response behavior of a given antenna for circular, linear vertical, and linear horizontal polarizations. The model parameters are defined by a nonlinear Kalman filtering algorithm which effectively estimates these parameters from measured antenna pattern data. Results of the modeling process are shown and compared against t... View full abstract»

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  • Scattering from axisymmetric dielectrics or perfect conductors imbedded in an axisymmetric dielectric

    Publication Year: 1977, Page(s):575 - 580
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    Waterman's T -matrix formulation of classical electromagnetic scattering from a single, homogeneous scatterer has been extended by Peterson and Ström to include scattering from multilayered scatterers. The T -matrix refers to expansions in spherical wave solutions of the vector Helmholtz equation. This theory and the co... View full abstract»

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  • Analysis of weather radar return

    Publication Year: 1977, Page(s):457 - 470
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1216 KB)

    A mathematical model of detected clutter from an airborne weather radar of conventional design is developed. The model is the joint probability density of samples of radar return from hydrometeors at the same nominal range and scan angle. It is developed from analysis of the effect on the received signal of the following parameters: inhomogeneous hydrometeor motion, radar frequency stability, puls... View full abstract»

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  • The dipole moments of a dielectric cube

    Publication Year: 1977, Page(s):590 - 592
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    As a part of a general study of the low frequency scattering properties of atmospheric particles of various shapes, the dipole moments of homogeneous dielectric rectangular parallelepipeds have been examined and data obtained for the special case of a cube. The results are presented and differ substantially from those previously reported in the literature. View full abstract»

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  • An analysis of the Wheeler method for measuring the radiating efficiency of antennas

    Publication Year: 1977, Page(s):552 - 556
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A model problem is formulated to evaluate the limitations imposed by the assumptions in the Wheeler or cap method for measuring the radiating efficiency of antennas. The antenna in the model is a circular loop and the radiation shield is a spherical metal shell. Calculated values of the actual efficiency of the antenna and the efficiency that would be measured using the Wheeler method are compared... View full abstract»

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  • The electrically small magnetically loaded multiturn loop antenna

    Publication Year: 1977, Page(s):496 - 505
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    An analytical model of a class of electrically small multiturn loop antennas has been formulated and compared with experimental measurements over a frequency range of 3 to 86 MHz. Both air core and magnetically loaded eases were examined. Transmitted signal enhancement as high as 10 dB was predicted and observed by magnetic loading. Several interesting properties of the transmitting antenna were i... 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