Proceedings of the IEEE

Issue 11 • Nov. 1974

Filter Results

Displaying Results 1 - 25 of 31
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): c1
    Request permission for commercial reuse | PDF file iconPDF (470 KB)
    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1974, Page(s):1412 - 1415
    Request permission for commercial reuse | PDF file iconPDF (401 KB)
    Freely Available from IEEE
  • Some problems in the asymptotic theory of diffraction

    Publication Year: 1974, Page(s):1416 - 1437
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2564 KB)

    The paper is a review of asymptotic methods in the theory of diffraction and emphasizes Soviet contributions. Without going into mathematical details it presents a survey of a number of applications of ray techniques and their generalizations to problems of diffraction. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An analysis of the radiation from apertures in curved surfaces by the geometrical theory of diffraction

    Publication Year: 1974, Page(s):1438 - 1447
    Cited by:  Papers (51)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (923 KB)

    In this paper the geometrical theory of diffraction is extended to treat the radiation from apertures or slots in convex perfectly conducting surfaces. It is assumed that the tangential electric field in the aperture is known so that an equivalent infinitesimal source can be defined at each point in the aperture. Surface rays emanate from this source which is a caustic of the ray system. A launchi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A uniform geometrical theory of diffraction for an edge in a perfectly conducting surface

    Publication Year: 1974, Page(s):1448 - 1461
    Cited by:  Papers (1505)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1327 KB)

    A compact dyadic diffraction coefficient for electromagnetic waves obliquely incident on a curved edse formed by perfectly conducting curved ot plane surfaces is obtained. This diffraction coefficient remains valid in the transition regions adjacent to shadow and reflection boundaries, where the diffraction coefficients of Keller's original theory fail. Our method is based on Keller's method of th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Comparison between edge diffraction processes

    Publication Year: 1974, Page(s):1462 - 1468
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (643 KB)

    An analysis of the diffraction processes at a wedge in the geometrical theory of diffraction is presented. In the case where one wave mode can propagate outside a nonideally conducting wedge we show that the diffracted field can be viewed as consisting of a "nonreflected contribution" and a "reflected contribution." A generalization method from the one-mode case to the case where two modes of prop... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Comparison of three high-frequency diffraction techniques

    Publication Year: 1974, Page(s):1468 - 1474
    Cited by:  Papers (86)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (802 KB)

    Three high-frequency methods of calculating the scattering from metallic edged bodies are compared. The first two are the physical and geometrical theories of diffraction, which have been well established since the late 1950's, and the third is the method of equivalent currents. It is shown that the three share remarkably similar features, although each has its particular virtues and limitations i... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ray-optical analysis of reflection in an open-ended parallel-plane waveguide: II-TE case

    Publication Year: 1974, Page(s):1475 - 1481
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    The reflection problem for a TE mode traveling toward the end of a semi-infinite parellel-plane waveguide is solved by ray methods. Unlike a previous solution due to Yee et al., the present ray-optical solution is a rigorous asymptotic result, i.e., it is identical with the asymptotic expansion (width of waveguide large compared to wavelength) of the exact solution. Numerical results for the modal... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Surface ray analysis of mutually coupled arrays on variable curvature cylindrical surfaces

    Publication Year: 1974, Page(s):1482 - 1492
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    Two previously developed ray methods for conformal arrays on surfaces with variable curvature are further systematized and applied to arrays of equispaced identical slits on perfectly conducting parabolic cylindrical surfaces. The two methods differ in their definition of the canonical problems that are fundamental to the scattering process. In the first method, multiple scattering on the smooth c... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Geometrical optics of inhomogeneous and nonstationary dispersive media

    Publication Year: 1974, Page(s):1492 - 1510
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1969 KB)

    The survey is devoted to the asymptotic theory of electro-magnetic waves in dispersive media with variable parameters. General questions of the space-time geometric-optics method are considered in Section I. The peculiarities of the material equations for weakly nonstationary dispersive media are discussed in Section II. Numerous physical problems which admit analytical solutions by the geometrica... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some problems of asymptotic theory of nonlinear waves

    Publication Year: 1974, Page(s):1511 - 1517
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (707 KB)

    Asymptotic methods developed recently in the nonlinear wave theory and applicable to the analysis of nonsinusoidal processes are discussed. These methods are based on the assumption of sufficiently slow space-time modulation of wave parameters (shortwave approximation). The intention of this paper is neither to review all problems of asymptotic wave theory nor to give a complete bibliography. Its ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Wave packets in strongly dispersive media

    Publication Year: 1974, Page(s):1518 - 1523
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (495 KB)

    An analytical study of the evolution of slowly varying wave pulses in strongly dispersive media which takes into account dispersive correction terms involving higher derivatives of the group velocity is given. A higher order differential equation for the envelope function is derived and solved recursively and by means of a procedure based on an analogy with the Schrödinger equation. The equat... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Waves in turbulent air: A phenomenological model

    Publication Year: 1974, Page(s):1523 - 1529
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (694 KB)

    Waves propagating through random media undergo large phase and amplitude scintillations even when the scattering at other than very small angles is insignificant. A large number of literature on the subject has been written in recent years. Nevertheless many of the more interesting effects (amplitude scintillation) are not well understood because the theory of the interaction is formulated too abs... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of Gaussian beam propagation and diffraction by inhomogeneous wave tracking

    Publication Year: 1974, Page(s):1530 - 1541
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1035 KB)

    Inhomogeneous waves behave locally like A(r) exp[ikS(r)], where A and S are spatially dependent complex amplitude and phase functions, and k is the (large) free-space wavenumber. A previously developed asymptotic theory for high-frequency propagation and scattering of such waves is here applied to the propagation and scattering of paraxial Gaussian beams. Attention is given to Gaussian beams in fr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of complex ray tracing to scattering problems

    Publication Year: 1974, Page(s):1541 - 1551
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1004 KB)

    Representations and geometric constructions associated with complex points, complex lines, and complex rays are introduced. They are applied to the problem of scattering of an evanescent plane wave by a conducting circular cylinder. This problem has an exact solution, which provides a check of the validity of complex ray tracing and suggests more general applications. An important role is played b... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Beam scattering by nonuniform leaky-wave structures

    Publication Year: 1974, Page(s):1552 - 1561
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1051 KB)

    A method is presented for obtaining the scattered field due to a beam incident on a layered structure or on a dielectric grating whose properties vary slowly along a longitudinal direction. The scattered field is expressed in terms of a Green's function whose form is particularly simple for a large class of practical problems involving laser beams incident on structures capable of guiding leaky wa... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optical resonators in the approximation of Gauss

    Publication Year: 1974, Page(s):1561 - 1570
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1312 KB)

    A general theory of optical resonators based on the concept of complex point-eikonal is presented. The analysis is limited to the approximation of Gauss. The modes of resonance of open resonators formed by two spherical mirrors facing each other have been obtained in previous works by fitting the wavefronts of Gaussian beams to the mirror surfaces. This method becomes complicated when the resonato... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The propagation of wave packets in inhomogeneous anisotropic media with moderate absorption

    Publication Year: 1974, Page(s):1571 - 1577
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (676 KB)

    Hamilton's equations for geometric optics contain the quantity ∂ω/∂k which is complex in absorbing media. To investigate its physical meaning, the field of a wave packet (a pulsed beam) in a homogeneous medium with moderate absorption is calculated using the saddle-point method. The packet velocity v is approximately equal to the real part of ∂ωS/∂k View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Complex rays for radio waves in an absorbing ionosphere

    Publication Year: 1974, Page(s):1577 - 1585
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (842 KB)

    Ray techniques are used to construct an approximate solution for radio waves propagating in the ionosphere when the loss of energy due to collisions is not negligible. For the time-harmonic problem, the solution is in the form of an asymptotic expansion in a large parameter scaling the operating frequency and the natural frequencies characterizing the ionospheric properties. Complex rays are intro... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Complex space-time rays and their application to pulse propagation in lossy dispersive media

    Publication Year: 1974, Page(s):1586 - 1598
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1229 KB)

    Asymptotic transient field solutions of the form A(r,t) exp [iS (r, t)], where S is a rapidly and A a slowly varying function of space and time, may be analyzed in terms of wave packets with central frequency ω =-∂S/∂t and central wavenumber k = ∇S. When the (dispersive) medium is lossless, stationary, and homogeneous, wave packets with constant real ω and k move along ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A comparison of geometrical and integral fields from high-frequency reflectors

    Publication Year: 1974, Page(s):1603 - 1604
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (231 KB)

    Various comparisons are made between geometrical optics, integrated physical optics, asymptotic physical optic, the geometrical theory of diffraction, and experimental data for fields from high-frequency paraboloidal and hyperboloidal reflectors. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Numerical evaluation of the mutual coherence function of a laser beam in atmospheric turbulence

    Publication Year: 1974, Page(s):1604 - 1606
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (273 KB)

    Using transport methods we have computed the mutual coherence function of a laser beam propagating in turbulence with a modified von Karman spectrum for the index of refraction fluctuations, including a parametric study of the effect of varying beam size, focal length, and the properties of the turbulence. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Moment characterization of a doubly spread surface-scatter channel at high Rayleigh parameters

    Publication Year: 1974, Page(s):1606 - 1608
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (319 KB)

    Many communication channels involving distortion due to random time-varible surface scattering suffer from extremely acute time and frequency smear. This is particularly true for sonar and low or medium frequeacy electromagnetic propaption where Fresnel zones can be large and yet where Rayleigh parameters can also be quite high. Using a simple Fresnel corrected geometric optics model for the surfa... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Representation of vectorial Gaussian beams by field of current sources at a complex location

    Publication Year: 1974, Page(s): 1608
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (145 KB)

    The concept of radiation from a distribution of oscillating current at a complex location can be used to describe the aberrations of a Gaussian beam. First-order theory requires an electric dipole for representing a beam. Third-order theory calls for a pair of electric dipoles, magnetic dipoles, and electric quadrupoles. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Inhomogeneous wave tracking in anisotropic media

    Publication Year: 1974, Page(s):1609 - 1610
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (250 KB)

    A previously developed procedure for tracking inhomogeneous local plane wave fields with complex phase and amplitude in isotropic media is extended to uniaxially anisotropic media. A Gaussian beam in the anisotropic medium is considered as an example. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

The most highly-cited general interest journal in electrical engineering and computer science, the Proceedings is the best way to stay informed on an exemplary range of topics.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
H. Joel Trussell
North Carolina State University