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IEEE Transactions on Antennas and Propagation

Issue 1 • Date January 1967

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

    Publication Year: 1967, Page(s): 0
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    Freely Available from IEEE
  • Preface [to the Special Issue]

    Publication Year: 1967, Page(s):2 - 3
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    Freely Available from IEEE
  • Partial coherence: A nonstatistical approach, and some basic microwave experiments.

    Publication Year: 1967, Page(s):4 - 9
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The basic concepts of second-order coherence theory are introduced, followed by a nonstatistical development of the coherence equations. The various possible generalizations of scalar second-order coherence are briefly described. Microwave experiments are reported in which incoherent as well as partially coherent radiating sources are simulated by suitable arrangements of noise tubes. Two effects ... View full abstract»

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  • Coherence theory of radio-astronomical measurements

    Publication Year: 1967, Page(s):10 - 20
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1228 KB)

    A unified theory of radio-astronomical measurements is presented within the framework of the theory of partial coherence. It is shown how different coherence functions are related to the spectrum, the brightness distribution, and the polarization of statistical electromagnetic fields, and to their measurement. These coherence functions can be derived from the space-time coherence tensor. Various r... View full abstract»

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  • Classification of wave phenomena and its relation to coherence theory

    Publication Year: 1967, Page(s):21 - 24
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (430 KB)

    Various types of problems that arise within the framework of wave propagation through a medium are classified according to whether the medium or the source is random or nonrandom. When both medium and source are nonrandom, the applicable differential equation is of a deterministic nature; otherwise, it is stochastic. A representative case of a random medium and nonrandom source is the multiple sca... View full abstract»

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  • An analysis of the second moment of fluctuating electromagnetic fields part I: Theory

    Publication Year: 1967, Page(s):24 - 32
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (915 KB)

    This paper presents a mathematical treatment of the second-order coherence properties of fluctuating vector electromagnetic fields of arbitrary spectral width. We consider only fields whose random fluctuations result exclusively from the chaotic nature of the source. The theory is expressed in terms of the second-order moment of the field vector and hence is a tensor theory. In order to apply it t... View full abstract»

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  • An analysis of the second moment of fluctuating electromagnetic fields part II: An application to measurement

    Publication Year: 1967, Page(s):32 - 36
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    The theory of the dyadic field spectrum (DFS) of a fluctuating electromagnetic field developed in Part I is applied to the analysis of a particular experiment. The experiment is simply the measurement of the DFS by means of a two-element interferometer. The analysis includes the effect of the polarization and receiving pattern of the interferometer on the measurement and applies to the DFS of a pa... View full abstract»

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  • Geometric analysis of partially polarized electromagnetic waves

    Publication Year: 1967, Page(s):37 - 40
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (279 KB)

    Some invariant properties of partially polarized electromagnetic waves are studied geometrically. Transformations of the complex degree of correlation and the degree of polarization are studied in the Poincaré and Cayley-Klein models of three-dimensional non-Euclidean hyperbolic space by means of simple geometric constructions which lucidly show the relationships between these quantities. View full abstract»

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  • Hologram coherence effects

    Publication Year: 1967, Page(s):41 - 48
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1359 KB)

    Holograms formed from opaque particles in a clear aperture illuminated with quasi-monochromatic, partially coherent light are considered. The method used to formulate the general boundary-value problem for the pair of wave equations propagating the mutual-coherence function is described. The effect of a reduction in spatial coherence on the resolution limit of a Fraunhofer (far-field) hologram is ... View full abstract»

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  • Coincident arrays for the direct measurement of the principal solution in radio astronomy

    Publication Year: 1967, Page(s):49 - 59
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (658 KB)

    Multiplication techniques are used on a single array to synthesize a product pattern (effectively the product of the voltage patterns of two coincident arrays), which yields the principal solution when it scans a source distribution. A formula for the array-element weighting coefficients is obtained. The behavior of these coefficients for various array sizes is investigated. It is also shown that ... View full abstract»

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  • Propagation of a spherically symmetric mutual coherence function through a random medium

    Publication Year: 1967, Page(s):66 - 69
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    In this paper, an approximate solution obtained by iteration is given for the development of a spherically symmetric mutual coherence function, representing radiation propagating through a statistically homogeneous and isotropic random medium. Only small angle scattering about the radial propagation direction is considered. The results are compared to the problem where propagation is principally i... View full abstract»

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  • Guided waves in bounded media with random gross inhomogeneities

    Publication Year: 1967, Page(s):70 - 75
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (582 KB)

    A formalism to deal with propagation in waveguides containing media with statistically inhomogeneous, random, gross inhomogeneities over a finite axial range is proposed. Statistics of the propagating fields are obtained in terms of those of the medium through an iterative perturbation technique which does not use expansion in a small parameter. A modal expansion, with a nonlinear phase progressio... View full abstract»

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  • Application of coherence theory to propagation of a quasi-monochromatic field in a random medium

    Publication Year: 1967, Page(s):76 - 80
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (467 KB)

    Starting from the partial differential equation for scalar wave propagation in a random medium, an integral equation is derived for the propagation of the second-order correlation function. In order to obtain the exact integral equation without resorting to perturbation theory, it is necessary to assume statistical independence of the wave function and the refractive index fluctuations. The physic... View full abstract»

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  • Propagation in random media--Cumulative effect of weak inhomogeneities

    Publication Year: 1967, Page(s):81 - 89
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (793 KB)

    The effect of weak, random inhomogeneities on wave propagation is studied. Of particular concern is the case of long distance propagation where the nature of the wave is significanfly affected by the inhomogeneities. Conventional perturbation techniques such as geometrical optics and the Born and Rytov approximations cannot be applied in this realm. The approximation technique employed is basicall... View full abstract»

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  • Image degradation with random wavefront tilt compensation

    Publication Year: 1967, Page(s):90 - 98
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (676 KB)

    The perturbations on electromagnetic wavefronts resulting from the propagation of plane waves through a random medium are resolved into two components: a random tilt and a random residual phase perturbation. This analysis permits the determination of the mean square angle of arrival from knowledge of the aperture plane phase correlation. It also suggests the use of the statistics of the residual p... View full abstract»

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  • Scattering by random distribution of spheres vs. concentration

    Publication Year: 1967, Page(s):99 - 118
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1239 KB)

    We give data and theory for scattering of 5-mm waves by Styrofoam spheres moving randomly within a slab region Styrofoam container. The results summarize two systematic programs of measurements for the forward scattered coherent phase, the average intensities (coherent, incoherent, and total), and for the variances and covariance of phase-quadrature components of the instantaneous field. These wer... View full abstract»

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  • Comparison of distribution functions from scattering data on different sets of spheres

    Publication Year: 1967, Page(s):118 - 135
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1075 KB)

    We compare certain reduced data records for scattering of 5-mm electromagnetic waves by two sets of Styrofoam spheres of different diameter, moving randomly within a slab-region Styrofoam container. For the small spheres we summarize raw measurements for the forward scattered coherent phase, for the average intensities, and for the variances and covariance of phase-quadrature components of the ins... View full abstract»

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  • Measurements of spatial coherence in 3.2-mm horizontal transmission

    Publication Year: 1967, Page(s):136 - 141
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (718 KB)

    An experiment designed to measure wavefront statistics in 3.2-mm wavelength horizontal transmission over an 18.95-km path is described. A frequency-stabilized signal is transmitted over the path and is received in two spaced antennas having variable separation. The receivers are instrumented to measure phase difference and amplitude fluctuations. A simultaneous beam-swinging experiment using a pre... View full abstract»

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  • Experimental comparison of scattering of coherent and incoherent light

    Publication Year: 1967, Page(s):141 - 147
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (653 KB)

    Light scattering experiments have been performed using as sources a continuous-wave He-Ne gas laser radiating at 6328 Å and a high-pressure xenon arc lamp, which was limited to a 100-Å bandwidth centered at 6328 Å. Both sources were used to determine, us a function of scattering angle, the intensity of light scattered by latex spheres ranging in diameters from 0.088 to View full abstract»

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  • An analysis of plasma emission by correlation radiometry

    Publication Year: 1967, Page(s):147 - 151
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (505 KB)

    Correlation radiometry is proposed as a method of distinguishing between collective and individual particle processes in plasma radiation. Several schemes of correlation radiometry are investigated and the appropriate one is selected to examine correlation between radiation emitted at axially separated points in a beam-plasma discharge column at the harmonics of the electron cyclotron frequency. T... View full abstract»

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  • Laser interferometry and photon scattering in plasma diagnostics

    Publication Year: 1967, Page(s):152 - 162
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1148 KB)

    Various methods for determining the characteristics of high-temperature plasmas using lasers are reviewed. Ordinary interferometric techniques are discussed with the extension of these ideas to active and passive laser cavity probing. It is seen that these methods well complement existing techniques for the determination of electron densities within the range ...
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  • Space-time correlation theory for information-carrying signals

    Publication Year: 1967, Page(s):163 - 171
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (862 KB)

    A theory is presented for the analysis and optimization of systems which process electromagnetic fields carrying information. The theory is thus intended for use primarily by communications and radar engineers. The definitions are motivated by a fundamental requirement that the input-output space-time mutual information transfer be a maximum. The theory can be applied to problems involving nonstat... View full abstract»

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  • Spatial spectral density functions

    Publication Year: 1967, Page(s):184 - 185
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (206 KB)

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  • On the multidimensional aspects of the coherence tensor excited by a distributed source

    Publication Year: 1967, Page(s):185 - 186
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  • Some quantum aspects of interference experiments

    Publication Year: 1967, Page(s):186 - 187
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Aims & Scope

IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas.

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Editor-in-Chief                                                 Kwok W. Leung