IEEE Transactions on Antennas and Propagation

Issue 4 • July 1977

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Displaying Results 1 - 25 of 33
  • [Front cover and table of contents]

    Publication Year: 1977, Page(s): 0
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    Freely Available from IEEE
  • Receiving antenna design for miniature receivers

    Publication Year: 1977, Page(s):528 - 530
    Cited by:  Papers (8)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (243 KB)

    A design procedure is described which determines the minimum required volume and the optimum dimensions for a ferrite loaded loop receiving antenna. The frequency of operation, bandwidth, transmitted signal strength, desired signal-to-noise ratio, receiver sensitivity, and the relative permeability of the ferrite are required to determine the design. Useful approximations for flux averaging, demag... View full abstract»

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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 (369 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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  • 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 (534 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 functionbar{T}(theta, phi, f)as a term whose produc... View full abstract»

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  • Influence of the wall geometry on reflection and transmission in anE-plane sectoral horn

    Publication Year: 1977, Page(s):556 - 560
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (393 KB)

    For a gradual waveguide-sectoral horn junction excited in the TEM mode, the influence of the wall geometry on reflection and transmission is investigated. The wall profile of the junction has the shape of a circular arc. When increasing the circle radius from zero, an abrupt junction changes to a smooth one. The magnitude of the reflection coefficient is reduced in a broadband manner whereas the p... 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 (21)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (574 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 underH-polarized plane wave illumination with grating spacinglambda/2 < a < lambdais made. As with all periodic surfaces investigat... 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 (489 KB)

    Waterman'sT-matrix formulation of classical electromagnetic scattering from a single, homogeneous scatterer has been extended by Peterson and Ström to include scattering from multilayered scatterers. TheT-matrix refers to expansions in spherical wave solutions of the vector Helmholtz equation. This theory and the computational method for calculating backscattering cross ... 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 (275 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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  • 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 theH- 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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  • 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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  • 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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  • Polarization utilization in profile inversion of a perfectly conducting prolate spheroid

    Publication Year: 1977, Page(s):505 - 511
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (624 KB)

    A new model for the solution of the inverse problem of electromagnetic scattering by smooth, convex-shaped, perfectly conducting, three-dimensional scatterers has been developed. Certain geometrical as well as physical optics approximations were used to incorporate the concept of Minkowski's problem of differential geometry into the space-time integral solution of electromagnetic scattering. This ... View full abstract»

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  • Transient excitation of an antenna with a nonlinear load: Numerical and experimental results

    Publication Year: 1977, Page(s):539 - 542
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (376 KB)

    A comparison of numerical and experimental results for the current flowing into a nonlinear diode load attached to the terminals of a receiving antenna for transient excitation is presented. It is shown that a simple nonlinear resistive model for the diode is not sufficient to obtain good agreement between the theoretical and experimental results. The diode model and numerical analysis are modifie... 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • Resonant frequency of a circular disc, printed-circuit antenna

    Publication Year: 1977, Page(s):595 - 596
    Cited by:  Papers (123)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (192 KB)

    The resonant frequency is obtained in analytical form for a planar, circular disc antenna which is etched on a printed-circuit board so that the low-profile antenna is separated from the ground plane only by a thin layer of dielectric material. The formula is found to have an error of less than 2.5 percent when compared with experimental data. View full abstract»

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  • Experimental investigations of a loop antenna as electron plasma wave radiator and detector

    Publication Year: 1977, Page(s):524 - 528
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (440 KB)

    The radiation and reception characteristics of a circular loop antenna for an electron plasma wave are investigated experimentally. As a result, it is shown that the measured directional radiation and reception patterns agree well with the theoretically predicted ones, and that the quantitatively measured amplitude of the radiated wave potentials are also found to agree fairly well with the theore... View full abstract»

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  • Radar scattering from intermittently contacting metal targets

    Publication Year: 1977, Page(s):512 - 518
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (888 KB)

    Radar returns from moving multielement metal targets often exhibit an unexpected modulation that has both random (or noise-like) and semicoherent components. One possible mechanism for producing this effect is the modification of the current distribution on the target that results when electrical contacts between target elements are altered intermittently by the forces associated with target motio... 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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  • Radio wave propagation along mixed paths in forest environments

    Publication Year: 1977, Page(s):471 - 477
    Cited by:  Papers (66)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (760 KB)

    The propagation of radio waves is examined for communication paths that may be partly within a forest and partly in regions outside the vegetation. Analytic results are found for simple canonic geometries in which the fields can be described in terms of ray-trajectories. By viewing a realistic forest environment as a combination of such canonic cases, it is possible to evaluate radio losses in com... 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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IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas.

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Editor-in-Chief                                             Danilo Erricolo