By Topic

IEEE Transactions on Antennas and Propagation

Issue 2 • March 1981

Filter Results

Displaying Results 1 - 25 of 43
  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (176 KB)
    Freely Available from IEEE
  • Opening remarks

    Publication Year: 1981, Page(s):190 - 191
    Request permission for commercial reuse | PDF file iconPDF (186 KB)
    Freely Available from IEEE
  • The applicability of an inverse method for reconstruction of electron-density profiles

    Publication Year: 1981, Page(s):245 - 252
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (730 KB)

    Inverse scattering theory is used to reconstruct profiles of electron density from the analytic representation of the reflection coefficient. The complex reflection coefficientr(k)is represented as a rational function of the wavenumberk. Using a three-pole approximation forr(k), the one-dimensional inverse scattering theory is applied to obtain a closed-form expres... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Polarization dependence in electromagnetic inverse problems

    Publication Year: 1981, Page(s):262 - 271
    Cited by:  Papers (77)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (877 KB)

    The complete description of electromagnetic scattering processes implies polarization since an electromagnetic scatterer acts like a polarization transformer. The main objective is to show that due to the vector nature of electromagnetic waves, electromagnetic remote sensing and inverse scattering techniques, if applied rigorously, require incorporation of polarization information into their formu... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Solution of underdetermined electromagnetic and seismic problems by the maximum entropy method

    Publication Year: 1981, Page(s):271 - 274
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Many inversion problems require solution of a Fredholm integral equation of the formT(bar{r}) = int D(bar{r},bar{r}')sigma (bar{r}') dV', whereTis the observable,Dis an operator, andsigmais the unknown parameter distribution. Examples occur in the areas of radiation and scattering, tomography, and geotomography. We reduce the equation to matrix form and ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Remote sensing of path-averaged raindrop size distributions from microwave scattering measurements

    Publication Year: 1981, Page(s):275 - 281
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    A multichannel microwave propagation experimental system whose frequencies are 1.7 GHz, 11.5 GHz, 34.5 GHz, and 81.8 GHz is introduced in order to measure not only attenuation and phase shift due to rain, but also to infer a path-averaged raindrop size distributionoverline{N(D)}from the measurements, in addition to 11.5 GHz, 34.5 GHz, and 81.8 GHz copolar attenuation, phase variations b... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Determination of the parameters of a dipole by measurement of its magnetic field

    Publication Year: 1981, Page(s):282 - 287
    Cited by:  Papers (37)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A novel method to determine the parameters (dipole moment, orientation, and location) of a magnetic dipole is discussed. The method, which requires no a priori knowledge of the parameters, consists of measuring one or more components of the magnetic field of the dipole in a two-dimensional grid and performing a two-dimensional multiparameter nonlinear least squares fit to the data. Results of comp... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Physical optics imaging with limited aperture data

    Publication Year: 1981, Page(s):332 - 335
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (275 KB)

    Some results are reported of an applied research effort concerning the imaging and/or identification of conducting cones based on measured transient response data. An important restriction on the effort was that data were available at only a few look angles, all withinpm30degof nose-on incidence. The accuracy between measured data set and physical optics inverse scattering results is fi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Target classification with multiple frequency illumination

    Publication Year: 1981, Page(s):352 - 358
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (581 KB)

    Target classification may be viewed as a crude form of inverse scattering that determines which ofMprespecified body shapes is most consistent with the scattered field data. A method is described for discriminating between different target shapes by appropriately processing the backscattered waveforms or target signature observed in radar receivers. Although this general subject has rec... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Stability problems in inverse diffraction

    Publication Year: 1981, Page(s):368 - 372
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (465 KB)

    Inverse diffraction consists in determining the field distribution on a boundary surface from the knowledge of the distribution on a surface situated within the domain where the wave propagates. This problem is a good example for illustrating the use of least-squares methods (also called regularization methods) for solving linear ill-posed inverse problems. We focus on obtaining error bounds for r... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some mathematical considerations in dealing with the inverse problem

    Publication Year: 1981, Page(s):373 - 379
    Cited by:  Papers (74)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (626 KB)

    Many problems of mathematical physics can be formulated in terms of the operator equationAx = y, whereAis an integro-differential operator. GivenAandx, the solution foryis usually straightforward. However, the inverse problem which consists of the solution forxwhen givenAandyis much more difficult. The followin... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The phase retrieval problem

    Publication Year: 1981, Page(s):386 - 391
    Cited by:  Papers (60)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (731 KB)

    The phase retrieval problem arises in applications of electromagnetic theory in which wave phase is apparently lost or impractical to measure and only intensity data are available. The mathematics of the problem provides unusual insights into the nature of electromagnetic fields. The theory is reviewed and illustrated. The basic issue of the phase retrieval problem, stated for a one-dimensional fi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Estimation of the volume and the size of a scatterer from band-limited time domain signature

    Publication Year: 1981, Page(s):398 - 399
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (214 KB)

    An inverse scattering model, based on the time domain concepts of electromagnetic theory, is developed using the first five (zeroth to fourth) moment condition integrals to recover the Rayleigh coefficient and the next higher order nonzero coefficient of the power series expansion ink(wavenumber) of the target backscattering response. The Rayleigh coefficient and the other coefficient t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Encoding of information in inverse scattering problems

    Publication Year: 1981, Page(s):406 - 408
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (347 KB)

    The use of functions of classEfor encoding information in inverse scattering-and in general inverse optical-problems is outlined. The way in which zeros describe all the information about band-limited functions is presented. Subsequently, the advantages of utilizing this description are considered. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Polarization dependence of RCS--A geometrical interpretation

    Publication Year: 1981, Page(s):412 - 413
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The variation of back-scattered radar cross section (RCS) with common transmit-receive polarizationPis given by a simple geometrical construction on the Poincare sphere. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back cover]

    Publication Year: 1981, Page(s): c4
    Request permission for commercial reuse | PDF file iconPDF (359 KB)
    Freely Available from IEEE
  • Unified theory of near-field analysis and measurement: Scattering and inverse scattering

    Publication Year: 1981, Page(s):342 - 351
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1144 KB)

    The many scanning procedures of the author's unified theory of near-field analysis and measurement are applied to the determination of complex bistatic scattering patterns of scalar and electromagnetic systems, both with and without correction for the patterns of the probes, one of which may be a compact range. For high accuracy, both the incident and scattered fields are expressed as linear combi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Frequency swept tomographic imaging of three-dimensional perfectly conducting objects

    Publication Year: 1981, Page(s):312 - 319
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    The use of frequency swept or frequency diversity techniques to achieve, superresolution in the imaging of three-dimensional perfectly conducting objects is studied and demonstrated by computer simulations. The frequency swept imaging concept is found to be a generalization of the inverse scattering theory. By invoking Fourier domain projection theorems, it is demonstrated analytically that images... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Solution of the inverse electromagnetic scattering problem in the resonance case

    Publication Year: 1981, Page(s):293 - 297
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    In the scattering process of electromagnetic waves from dielectric or conducting targets, one often encounters resonances in frequency in the returned echo signals. In previous studies on the scattering of acoustic and elastic waves, analogous resonant echoes were shown to contain a wealth of information on the properties of the scattering target, permitting, in fact, the complete solution of the ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Improved resolution in microwave holographic images

    Publication Year: 1981, Page(s):320 - 326
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    Microwave holography is a useful experimental technique for imaging remote or inaccessible objects and for diagnostics of antennas, radomes, and scatterers; however, diffraction restricts image resolution. A method is described for improving resolution in microwave holography. The holograms are spherical or circular. Porter's scalar theory of curved holograms is extended to vector fields by using ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spectral and time domain approaches to some inverse scattering problems

    Publication Year: 1981, Page(s):206 - 212
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    Four methods of electromagnetic probing of an inhomogeneous plane stratified medium are presented. They differ by the nature of the incident wave used in the diagnostic. In the first method, the medium is considered as a structure propagating guided modes, and permittivity profiles are determined from the knowledge of one of the guided modes. In the next three, the medium is considered as a scatte... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Inverse scattering technique applied to remote sensing of layered media

    Publication Year: 1981, Page(s):298 - 306
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    An inverse scattering technique applied to a remote estimation of the dielectric and conductivity profile of an inaccessible layered medium is presented. The inaccessible region is illuminated by plane waves at normal incident, and the data are taken as the reflected power at a fixed remote location for a set of discrete frequencies. The problem of estimating the dielectric and conductivity profil... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Iterative determination of permittivity and conductivity profiles of a dielectric slab in the time domain

    Publication Year: 1981, Page(s):239 - 245
    Cited by:  Papers (61)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A numerical method is presented to compute one unknown constitutive parameter of an inhomogeoeous lossy dielectric slab from the reflected field in the time domain. The method is based upon a space-time discretization of the integral equation for the reflected field. In the inversion, especially those space-time points where the numerical computation of the electric-field strength in the slab is m... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Operator-theoretic and computational approaches to Ill-posed problems with applications to antenna theory

    Publication Year: 1981, Page(s):220 - 231
    Cited by:  Papers (84)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1360 KB)

    A general framework for regularization and approximation methods for ill-posed problems is developed. Three levels in the resolution processes are distinguished and emphasized: philosophy of resolution, regularization-approximation schema, and regularization algorithms. Dilemmas and methodologies of resolution of ill-posed problems and their numerical implementations are examined in this framework... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Newton-Kantorovitch algorithm applied to an electromagnetic inverse problem

    Publication Year: 1981, Page(s):232 - 238
    Cited by:  Papers (206)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    An efficient algorithm is presented to compute the shape of perfectly conducting cylinders via knowledge of scattering cross sections. This choice of scattering data avoids the difficulties linked with the phase measurements or reconstructions. The mathematical analysis is performed in terms of operator and functions, and the fundamental instability of the problem is demonstrated. Then the stabili... View full abstract»

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

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