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Antennas and Propagation, IEEE Transactions on

Issue 3 • Date May 1969

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Displaying Results 1 - 25 of 49
  • [Front cover and table of contents]

    Publication Year: 1969 , Page(s): 0
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  • Comments on "Distortion of electromagnetic pulses at totally reflecting layers"

    Publication Year: 1969 , Page(s): 388
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  • Correction to "Frequency correlation of line-of-sight signal scintillations"

    Publication Year: 1969 , Page(s): 389
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  • [Back cover]

    Publication Year: 1969 , Page(s): c4
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  • Quantization sidelobes of a phased array with a triangular element arrangement

    Publication Year: 1969 , Page(s): 363 - 365
    Cited by:  Papers (1)  |  Patents (1)
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    In order to be able to restrict grating lobes from real space with fewer radiating elements, the triangular rather than rectangular radiating element arrangement is frequently selected. The price is the admission to real space of grating-lobe quantization sidelobes. View full abstract»

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  • Dipole admittance for magnetoplasma diagnostics

    Publication Year: 1969 , Page(s): 389 - 392
    Cited by:  Papers (7)
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    A method is presented for calculating the admittance of a short thin dipole antenna in a cold collisional magnetoplasma. The theory is quasi-static, and the results are slightly more accurate than in previous analyses. Numerical calculations of admittance as a function of frequency are presented for several different orientations of the dipole with respect to the magnetic field. For any orientation the calculations show that the plasma frequency and the upper hybrid frequency can be readily identified. View full abstract»

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  • IEEE standard definitions of terms for radio wave propagation

    Publication Year: 1969 , Page(s): 270 - 275
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  • On the stationary properties of the integral equations of infinite phased arrays

    Publication Year: 1969 , Page(s): 359 - 360
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    The integral equations for infinite phased arrays have generally been constructed with complex nonsymmetric kernels. Nevertheless, it has been shown earlier that these nonsymmetric forms can generally be transformed into a complex-symmetric form with consequent stationary properties. It is shown here that the phased array must possess certain symmetry properties for the complex-symmetric form to exist. View full abstract»

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  • A creeping-wave analysis of the edge-on echo area of disks

    Publication Year: 1969 , Page(s): 400
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  • A planar creeping wave

    Publication Year: 1969 , Page(s): 378 - 379
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  • A proposed passive multiple-beam antenna

    Publication Year: 1969 , Page(s): 371 - 373
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    Layers with equivalent refractive indices less than unity behave as angular low-pass spatial filters for plane waves. The layers are also capable of supporting leaky waves. The way these properties may be employed in the design of a passive multiple-beam antenna is indicated. View full abstract»

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  • Radiation patterns of a slot antenna in the presence of a breakdown sheath

    Publication Year: 1969 , Page(s): 392 - 395
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    The experimental radiation patterns are measured for a 0.4\times0.9 -inch slot antenna in the presence of aperture breakdown over a wide range of gas pressures and breakdown power levels. It was found that pattern distortion caused by the breakdown plasma was not very significant. The overall signal attenuation, however, could be extremely severe, particularly below 0.5 torr. View full abstract»

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  • Application of a surface integration technique to parallel-plate waveguide radiation-pattern analysis

    Publication Year: 1969 , Page(s): 280 - 285
    Cited by:  Papers (1)
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    A surface integration technique is presented which extends the usefulness of high-frequency diffraction methods. This technique is used in conjunction with wedge-diffraction theory to analyze the TEM radiation patterns of parallel-plate waveguides. The surface integral is obtained by Green's second identity. The fields on the surface are calculated by the wedge-diffraction method. This technique provides an improvement in the accuracy of the pattern as compared to the wedge-diffraction method. View full abstract»

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  • Evaluation of edge-diffracted fields including equivalent currents for the caustic regions

    Publication Year: 1969 , Page(s): 292 - 299
    Cited by:  Papers (83)
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    The fields diffracted by a body made up of finite axially symmetric cone frustums are obtained using the concepts of the geometrical theory of diffraction. The backscattered field for plane-wave incidence on such a target is obtained with particular emphasis on those regions that are usually avoided, namely, the caustic region and its immediate vicinity. The method makes use of equivalent electric and magnetic current sources which are incorporated in the geometrical theory of diffraction. This solution is such that it is readily incorporated in a general computer program, rather than requiring that a new program be written for each shape. Several results, such as the cone, the cylinder and the conically capped cylinder, are given. In addition, the method is readily applied to antenna problems. An example which is reported consists of the radiation by a stub over a circular ground plane. This present theory yields quite good agreement with experimental results reported by Lopez, whereas the original theory given by Lopez is in error by as much as 10 dB. View full abstract»

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  • An integral equation approach to scattering by dielectric rings

    Publication Year: 1969 , Page(s): 373 - 374
    Cited by:  Papers (3)
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    An integral equation method is applied to calculation of the scattering from homogeneous dielectric rings. The fields in the rings are assumed to be independent of \rho and z . Excellent agreement between the calculated and experimental backscattering cross section is obtained for the case of an axially incident linearly polarized plane wave. View full abstract»

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  • Physical optics inverse diffraction

    Publication Year: 1969 , Page(s): 308 - 314
    Cited by:  Papers (57)
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    A general method for solving the inverse diffraction problem is presented. It is based on an identity of Bojarski which states that \gamma (x) and \Gamma (p) are a Fourier transform pair. Here \gamma (x) is the characteristic function of the target ( \gamma =1 inside the target, \gamma = 0 outside), p = (2\omega /c)J,\omega is the frequency, J is a unit vector specifying the aspect, and \Gamma (P) can be obtained by measurement of the backscattered electromagnetic far field at frequency \omega = (c/2)|P| and aspect J=|p|^{-1}p . If data is obtained in any subset D of p space, the method yields partial or complete information about the target geometry. It is used to rederive earlier results very simply and to obtain a significant new solution, in which the target geometry is completely determined using frequencies only in a practical frequency band and aspects in a narrow cone. View full abstract»

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  • Distortion of electromagnetic pulses at totally reflecting layers

    Publication Year: 1969 , Page(s): 385 - 388
    Cited by:  Papers (1)
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    The plane-wave reflection of electromagnetic pulses from homogeneous and inhomogeneous layered media is discussed. Special attention is given to the case of total reflection which is characterized in the frequency domain by phase distortion without amplitude distortion. For this case it is shown that the waveform in the time domain undergoes a rather remarkable change. View full abstract»

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  • Experiences in tropospheric scatter propagation experiments

    Publication Year: 1969 , Page(s): 388 - 389
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  • Radiation and near-field coupling between two collinear open-ended waveguides

    Publication Year: 1969 , Page(s): 400
    Cited by:  Papers (1)
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  • IEEE standard definitions of terms for antennas

    Publication Year: 1969 , Page(s): 262 - 269
    Cited by:  Papers (14)
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  • Electromagnetic wave scattering from a finite volume turbulent plasma

    Publication Year: 1969 , Page(s): 342 - 347
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    General relations are developed for the classical scattering of plane electromagnetic waves in the first Born approximation from the turbulent fluctuations in the electron density of a weakly ionized, finite volume, arbitrarily shaped plasma. By finite volume we mean that the correlation length of the turbulence can be arbitrary compared to the dimensions of the plasma. Former work applies only to the case of small correlation lengths. The transmitter for the incident and the receiver for the scattered radiation are assumed to be in the far field of the scattering plasma. Scattering relations for a one-dimensional plasma are presented in order to point out simply the differences between the large and small correlation length cases. The general scattering relations are specialized for a parallelpiped plasma with a Gaussian autocorrelation function. The resulting integral is solved on a computer. Results show that the scattered radiation can be much greater than that evaluated with the Booker-Gordon relation, when the correlation length is greater than the incident EM wavelength. The scattered radiation is equal to or less than the Booker-Gordon value when the EM wavelength is greater than the correlation length. View full abstract»

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  • A loop antenna in a compressible plasma

    Publication Year: 1969 , Page(s): 396 - 398
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    An analysis is made of the radiation of an electron plasma wave from a circular-loop antenna with an arbitrary dimension immersed in a compressible plasma. The radiation resistance due to plasma-wave radiation is calculated and is compared with that due to electromagnetic-wave radiation. View full abstract»

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  • Diversity effect on VHF space communications

    Publication Year: 1969 , Page(s): 331 - 337
    Cited by:  Papers (1)
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    The signals in VHF space communications fluctuate rapidly on the propagational path through the turbulent ionosphere, and fading is of Rayleigh distribution, if circularly polarized waves are received. The diversity effect on VHF communications between an earth station and a satellite in a stationary orbit is about 10 to 20 dB, where transmitted linearly polarized waves are received by the use of circular or linear polarization diversity, when fading exists. The polarization diversity reception is effective in diminishing the time when signals fade out, and it will be one of the best methods for more reliable VHF space communications through the turbulent ionosphere. View full abstract»

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  • Performance of an optical heterodyne receiver for various receiving apertures

    Publication Year: 1969 , Page(s): 324 - 331
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    The results of an experimental study, dealing with the coherent detection of an optical signal after propagation over a 2.6-km atmospheric path, are presented. The average receiver output power was measured at the intermediate frequency for various receiving aperture diameters. The measured values were compared with predicted values calculated on the basis of no atmospheric degradations. The asymptotic approach of the received signal-to-noise ratio to a constant value for increasing aperture diameters is demonstrated and shown to be due to the turbulence in the propagation path. Typical values of the spatial coherence area are discussed. View full abstract»

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  • A note on the prediction of antenna tolerance from efficiency measurements

    Publication Year: 1969 , Page(s): 354 - 355
    Cited by:  Papers (2)
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Aims & Scope

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

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Meet Our Editors

Editor-in-Chief                                                 Kwok W. Leung