IEEE Transactions on Antennas and Propagation

Volume 29 Issue 2 • March 1981

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

    Publication Year: 1981, Page(s): 0
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    Freely Available from IEEE
  • Opening remarks

    Publication Year: 1981, Page(s):190 - 191
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  • 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»

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  • Polarization dependence in electromagnetic inverse problems

    Publication Year: 1981, Page(s):262 - 271
    Cited by:  Papers (80)
    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»

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  • 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»

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  • 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»

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  • Determination of the parameters of a dipole by measurement of its magnetic field

    Publication Year: 1981, Page(s):282 - 287
    Cited by:  Papers (38)  |  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»

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  • 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»

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  • 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»

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  • 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»

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  • Some mathematical considerations in dealing with the inverse problem

    Publication Year: 1981, Page(s):373 - 379
    Cited by:  Papers (75)
    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»

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  • The phase retrieval problem

    Publication Year: 1981, Page(s):386 - 391
    Cited by:  Papers (61)  |  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»

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  • 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»

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  • 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»

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  • 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»

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  • [Back cover]

    Publication Year: 1981, Page(s): c4
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    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»

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  • On computation of electromagnetic fields on planar surfaces from fields specified on nearby surfaces

    Publication Year: 1981, Page(s):402 - 404
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A technique is presented for solution of the inverse problem of calculating the electric field on a planar surface from the electric field specified on a nearby surface. An integral equation is derived that relates two orthogonal components of the electric field on the nearby surface to the respective components of the plane wave spectrum of the planar electric field. The integral equation is solv... View full abstract»

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  • Use of Radon's projection theory in electromagnetic inverse scattering

    Publication Year: 1981, Page(s):336 - 341
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    In a wide variety of electromagnetic profile reconstruction or shape imaging techniques, a need often arises to deduce the three-, two-, or one-dimensional distribution of different physical quantities from their projections, e.g., in radio-astronomy, structural biology, roentgenology, geophysics, and also in electromagnetic imaging. Investigation of such problems in various specialized areas resu... View full abstract»

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  • 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»

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  • Introduction to the special issue on inverse methods in electromagnetics

    Publication Year: 1981, Page(s):185 - 189
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    Inverse methods have become a fundamental tool in the physical sciences for remotely sensing unknown objects and reconstructing their physical properties. The objective of this special issue is to present an overview of this important rapidly emerging discipline and to provide examples of the wide scope of methods used to investigate inverse problems in electromagnetics, ranging from purely theore... View full abstract»

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  • Frequency swept tomographic imaging of three-dimensional perfectly conducting objects

    Publication Year: 1981, Page(s):312 - 319
    Cited by:  Papers (40)
    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»

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  • Synthetic imaging from coherent backscattering

    Publication Year: 1981, Page(s):380 - 385
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Scattered fields from radar targets can be processed to construct target images. An analytical simulation of coherent backscattering and synthetic imaging is reviewed. Conducting objects with an axial symmetry are used as examples to demonstrate the results of analytical backscattering and synthesis procedure. An interrogating radar waveform is simulated using the Hamming weighting function. The p... View full abstract»

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  • Improved performance of a subsurface radar target identification system through antenna design

    Publication Year: 1981, Page(s):307 - 311
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Improved identification performance of a video pulse subsurface radar system is reported. The video pulse system, which utilizes complex natural resonances of the target and a prediction correlation processing, is improved in comparison to the system reported previously by better fitting the system bandwidth to the bandwidth which contains the complex natural resonances of the desired target. The ... View full abstract»

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  • The inverse electromagnetic scattering problem for a perfectly conducting cylinder

    Publication Year: 1981, Page(s):364 - 368
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The problem of determining the shape of the cross section of a simply connected perfectly conducting infinite cylinder from a knowledge of the far-field pattern for all angles of observation and small values of the wavenumber is considered. The method proposed relies heavily on conformal mapping techniques. In particular it is shown that if the transfinite diameter is known each Fourier coefficien... 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