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IEEE Transactions on Antennas and Propagation

Issue 3 • Date May 1967

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Displaying Results 1 - 25 of 39
  • [Front cover and table of contents]

    Publication Year: 1967, Page(s): 0
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    Freely Available from IEEE
  • Flush mounted rectangular cavity slot antennas--Theory and design

    Publication Year: 1967, Page(s):342 - 351
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (767 KB)

    The loaded rectangular cavity slot antenna is analyzed using variational methods in conjunction with simplified equivalent circuit techniques to derive accurate design guides for efficiency, bandwidth, and resonant frequency. The aperture admittance is computed and the effects of a compound aperture plane iris and of material loading are analyzed. The aperture admittance of all such loaded cavity ... View full abstract»

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  • A class of notched omnidirectional antennas

    Publication Year: 1967, Page(s):352 - 356
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (490 KB)

    A class of antennas featuring a steerable notch in an otherwise omnidirectional pattern is described. This type of antenna presents an alternative to a narrow beam antenna for certain applications; it is attractive when a small antenna capable of 360\deg pattern rotation is desirable. The notch characteristic is obtained by combining in a single antenna three... View full abstract»

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  • Gain optimization for arbitrary antenna arrays subject to random fluctuations

    Publication Year: 1967, Page(s):356 - 366
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (785 KB)

    A general procedure is formulated for the maximization of the expected directive gain for arbitrary antenna arrays whose excitation amplitudes and phases as well as element positions are subject to random errors. Correlations are allowed to exist between the random fluctuations, and the general formulation imposes no restrictions on either the magnitude or the probability distribution of the fluct... View full abstract»

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  • An analytical approach to the coverage of a hemisphere by n planar phased arrays

    Publication Year: 1967, Page(s):367 - 371
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The coverage of a hemisphere by N planar phased arrays arranged in pyramids or pyramidal frustra is discussed. Transformations between the spherical coordinates of individual arrays and of the hemisphere of coverage are derived. These results are then used to determine the minimum value of the maximum scan angle required of each array and the positioning of the... View full abstract»

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  • Resistive receiving and scattering antenna

    Publication Year: 1967, Page(s):371 - 376
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    This work is a sequel to two earlier papers devoted to detailed theoretical and numerical analyses of the imperfectly conducting cylindrical transmitting antenna [1], [2]. A knowledge of the driving-point impedance of the transmitting antenna, as previously reported, and the short-circuit current, as derived in this paper, completely determine the receiving properties of the resistive antenna. It ... View full abstract»

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  • Resolution limitations of a finite aperture

    Publication Year: 1967, Page(s):376 - 381
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (486 KB)

    Methods of increasing antenna resolution by data processing are of interest in radio astronomy and radiometric mapping applications. This paper deals with the fundamental limitations of such operations. Communication theory techniques using prolate spheroidal wave functions have already been applied to antenna pattern synthesis. These techniques are applied to the problem of reconstituting an obse... View full abstract»

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  • Digital recording and short-term prediction of oblique ionospheric propagation

    Publication Year: 1967, Page(s):382 - 389
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    Synchronized oblique step-frequency ionosphere sounding are electrically recorded on punched paper tape without the intervening medium of photographic film. The resulting data are then automatically analyzed to yield statistics on the MOF, LOF, and MPF (a frequency below which multipath exceeds a pre-set limit). The MOF time autocorrelation decays smoothly to 0.87 in 9 minutes and to 0.5 in 65 min... View full abstract»

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  • Short-term forecasting for a high-frequency long-distance point-to-point communication path

    Publication Year: 1967, Page(s):390 - 394
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    Three techniques are presented which can allow the communicator to make maximum usable frequency forecasts. First, one-half hour, one hour, and two hour forecasts are made using running five-day median MOF curves obtained from data acquired by a synchronized step frequency sounder system. Fifty percent of the half-hour forecasts had an error no greater than 0.4 MHz. Second, short-term forecasts ar... View full abstract»

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  • Measurements of rainfall attenuation at 8 and 15 GHz

    Publication Year: 1967, Page(s):394 - 403
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (893 KB)

    Measurements of attenuation at frequencies of 8 and 15 GHz, and their correlation with rainfall rate, along a 15.78 km path near Ottawa, are described. Empirical expressions which relate the observed attenuation to the measured rainfall rate are derived and compared with similar expressions obtained on the basis of earlier theoretical studies of the problem. It is concluded that while the theoreti... View full abstract»

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  • Radio gain

    Publication Year: 1967, Page(s):404 - 410
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (585 KB)

    The radio gain or power transfer between two short electric dipole antennas in free space is derived. When the antennas are above and parallel to a perfectly conducting plane, the radio gain approaches a constant as the antennas approach the ground. As the antennas are raised the radio gain is approximately proportional to the square of the product of the antenna heights. At greater heights the in... View full abstract»

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  • Path diversity in propagation of millimeter waves through rain

    Publication Year: 1967, Page(s):410 - 415
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (433 KB)

    Cumulative distributions of attenuation due to rain are computed for the frequencies 11,18.5, and 30 GHz. The results are derived from a four-year sample of rainfall data obtained on a highly resolving areal rain gauge network in Bedfordshire, England. Lack of correlation of attenuation on both orthogonal and parallel paths is discussed and the effect of path diversity is demonstrated for the freq... View full abstract»

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  • Polarization and angle-of-arrival fluctuations for a plane wave propagated through a turbulent medium

    Publication Year: 1967, Page(s):416 - 421
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (458 KB)

    The correlation function of the fluctuations of the depolarized component of a plane wave as a function of the distance between two parallel line-of-sight paths is derived in terms of the index of refraction variations. A first-order solution to the wave equation is found using spectral analysis techniques. The mean square polarization fluctuation is predicted to have a View full abstract»

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  • Perturbation analysis of axially nonuniform electromagnetic structures using nonlinear phase progression.

    Publication Year: 1967, Page(s):422 - 430
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (806 KB)

    A perturbation technique is developed to deal with axial, as well as transverse, perturbations of an electromagnetic propagating structure which is otherwise axially uniform. The method, an adaptation and extension of time-dependent perturbation theory of quantum mechanics, uses a nonlinear phase progression term in the axial propagating factor of the fields to accommodate and readily calculate, w... View full abstract»

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  • Electromagnetic propagating structures with nonuniform gross perturbations

    Publication Year: 1967, Page(s):431 - 437
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (651 KB)

    The perturbation technique presented in a companion paper is here extended to permit even gross perturbations. A generalization and modification of the Brillouin-Wigner method, the present iterative procedure circumvents expansions in powers of a perturbation parameter, but retains a normal mode expansion. Much improvement in convergence is obtained over the previous technique, an adaptation of th... View full abstract»

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  • Scattering from low-density dielectric bodies

    Publication Year: 1967, Page(s):437 - 441
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    It is shown that the coherent scattering integral provides a convenient and mathematically tractable method of solving scattering problems of large, low-density, dielectric bodies. In this method the solid dielectric body is replaced by an assembly of particles whose boundary coincides with the outside surface of the dielectric body. Considering the coherent scattering integral, and realizing that... View full abstract»

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  • Scattering by an infinite cylinder coated with an inhomogeneous and anisotropic plasma sheath

    Publication Year: 1967, Page(s):452 - 457
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (442 KB)

    The problem of the interaction of an incident H wave with an infinite conducting cylinder coated with an inhomogeneous and anisotropic plasma sheath is treated analytically. Numerical results for the farfield pattern of the scattered field as well as the backscattering cross sections are presented for various interesting ranges of the parameters involved. Detai... View full abstract»

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  • Mutual coupling between sectoral horns side by side

    Publication Year: 1967, Page(s):475 - 477
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (271 KB)

    The mutual coupling between two sectoral horns side by side is formulated in terms of the rays, modes, and mode caustics excited in each horn. The coupling term is attributed to the multiple interaction between the aperture edges of both horns and is calculated using Keller's geometrical theory of diffraction. It is shown that this asymptotic method leads to an excellent agreement with experiment ... View full abstract»

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  • Resonances of loops

    Publication Year: 1967, Page(s):477 - 478
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (169 KB)

    First Page of the Article
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  • A consideration of the phase center of aperture antennas

    Publication Year: 1967, Page(s):478 - 480
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (213 KB)

    The previous formula of Nagelberg for determining the location of the phase center of aperture antennas is examined by calculating the phase patterns of a radiation field. The results show that the phase center should not be located at the aperture, but at the point determined by the expression derived here. View full abstract»

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  • Fresnel diffraction and focusing properties of apertures under partially coherent illumination

    Publication Year: 1967, Page(s):480 - 481
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    Fresnel diffraction from an aperture is investigated in order to determine how the focusing property of the aperture depends on the length of coherence of the illuminating field. The computations show how the focusing property becomes poorer as the coherence length decreases and the focus displaces itself toward the aperture. View full abstract»

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  • Measured angle-diversity performance of the wire-grid lens antenna

    Publication Year: 1967, Page(s):484 - 486
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (378 KB)

    First Page of the Article
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  • Radio-optical dispersion observed over a 25-km tropospheric path

    Publication Year: 1967, Page(s):487 - 488
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Data from a 25-km path show a 0.99 correlation coefficient between microwave range variation and microwave-optical dispersion. View full abstract»

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  • Characteristics of a tapered anechoic chamber

    Publication Year: 1967, Page(s):488 - 490
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (386 KB)

    The characteristic features of a tapered anechoic chamber are described. The smooth illumination amplitude in the chamber makes it usable as an indoor range for antenna pattern measurements, even at low frequencies. Variations in the transmission attenuation in the chamber as compared to free space require careful interpretation of absolute gain and cross section data. View full abstract»

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  • Near field of a conducting wedge

    Publication Year: 1967, Page(s):490 - 492
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The diffraction coefficients used in Keller's geometrical theory of diffraction are extended to the near field and shadow boundary regions of the edge. Two correction factors are introduced for the amplitude and phase terms of these coefficients and are calculated by comparison with the exact solution. The attractive features of these correction factors are briefly discussed, and their importance ... 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                                                 Kwok W. Leung