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IEEE Transactions on Antennas and Propagation

Issue 4 • July 1975

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Displaying Results 1 - 25 of 31
  • [Front cover and table of contents]

    Publication Year: 1975, Page(s): 0
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    Freely Available from IEEE
  • Two methods for the measurement of antenna efficiency

    Publication Year: 1975, Page(s):457 - 461
    Cited by:  Papers (107)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Two methods for measuring antenna efficiency are described. The two methods, referred to as the Wheeler method and theQmethod, are used to find the efficiency of electrically small multiturn loop antennas. The principal advantage of both methods is that they can be quickly and easily applied. Further, both methods relate the antenna efficiency to the input impedance rather than a far-fi... View full abstract»

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  • Diffraction by a concave perfectly conducting circular cylinder

    Publication Year: 1975, Page(s):480 - 492
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1162 KB)

    The determination of surface currents induced by a magnetic line source on a perfectly conducting concave cylindrical surface is dealt with in this paper. A "perfect" planar absorber is postulated along the cylinder diameter. The condition that the field be bounded at the origin requires the spectral representation of the characteristic Green's function to possess, in addition to a discrete spectr... View full abstract»

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  • Shape of the 5 mm oxygen band in the atmosphere

    Publication Year: 1975, Page(s):498 - 506
    Cited by:  Papers (317)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    The problem of absorption of microwaves by molecular oxygen in the atmosphere is treated by means of a first-order approximation to the impact theory of overlapping spectral lines. By including only the coupling between adjacent rotational states in molecular collisions, we have devised a simple approximate method for computing the interference between lines from measurements on the resolved lines... View full abstract»

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  • Computational methods for antenna pattern synthesis

    Publication Year: 1975, Page(s):507 - 512
    Cited by:  Papers (66)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    Some general numerical methods for antenna pattern synthesis, with and without constraints, are developed. Particular cases considered are 1) field pattern specified in amplitude and phase, 2) field pattern specified in amplitude only, and 3) these two cases with a constraint on the source norm. Both the source and the field are discretized at the beginning, and the methods of finite dimensional v... View full abstract»

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  • Optical technique for broadbanding phased arrays

    Publication Year: 1975, Page(s):516 - 523
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    An optical method for broadbanding a phased array is considered. A narrow band feed-through aperture lens comprised of pick-up elements, radiating elements, and360degtype phase shifters is fed by a small feed array with an intervening passive lens. The lens has fixed frequency-sensitive properties. The feed array has variable time delay compensators which are selected in accordance with... View full abstract»

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  • Design of circular apertures for narrow beamwidth and asymmetric low sidelobes

    Publication Year: 1975, Page(s):523 - 527
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    Taylor's earlier work on circular apertures is enlarged to include a class of radiation patterns consisting of a narrow central beam and asymmetric sidelobes. A synthesis technique applicable to such problems, and using Taylor patterns as building blocks, is formulated. One special case is treated in detail: a sidelobe topography which is 25 dB down in thephi = 0half-plane, smoothly ris... View full abstract»

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  • Electronic lobe switching by 90° corner reflector antenna with ferrite cylinders

    Publication Year: 1975, Page(s):527 - 531
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (471 KB)

    Simultaneous matrix equations are obtained for solving the problem of scattering by many different homogeneous ferrite cylinders located in front of a90degcorner reflector. The equations are based on the extended integral equations derived from the reciprocity theorem in the cylinders and on the method of images. After the problem of plane-wave scattering is treated, various radiation p... View full abstract»

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  • Radar and communications antenna-siting for low-angle radiation at high frequencies

    Publication Year: 1975, Page(s):560 - 565
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (506 KB)

    It is sometimes assumed that, in order to obtain good low-angle radio transmission and reception at HF, one must use vertical polarization and have an extensive horizontal highly conducting foreground, such as an ocean surface or an enormous ground screen. It is shown that, in the absence of such a surface, use may be made of inland sites having a sloping foreground combined with distant level ter... View full abstract»

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  • A low sidelobe Ka-band antenna-radome study

    Publication Year: 1975, Page(s):569 - 572
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (489 KB)

    An experimentalK_{a}-band (37 GHz) lens antenna designed to have -40 dB sidelobes or lower outside a cone of minimum practical size is described. The results are compared to that optimum Taylor pattern which, for fixed aperture size, maximizes the directivity on boresight subject to the above sidelobe constraint. The effect of a thick homogeneous spherical radome on the sidelobes, as we... View full abstract»

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  • Frequency scanning by leaky-wave antennas using artificial dielectrics

    Publication Year: 1975, Page(s):584 - 589
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    Frequency-scanning characteristics of an artificial dielectric leaky-wave antenna are discussed. It is experimentally observed that the beam angle changes from10degto50degoff broadside when the frequency is changed from 8.13 to 9.05 GHz. Over this frequency range the beamwidth does not vary monotonically and changes from7.5degto6.0degto7.1deg.... View full abstract»

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  • Far-field approximations to the Kirchoff-Helmholtz representations of scattered fields

    Publication Year: 1975, Page(s):590 - 592
    Cited by:  Papers (159)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The standard far-field approximation to the Kirchhoff formula for the field scattered by a flat metallic plateSof arbitrary shape is given by a certain surface (double) integral. This double integral can be reduced to a line integral evaluated around the boundary of S. Moreover, ifSis a polygon, this line integral can be reduced to a closed form expression involving no integr... View full abstract»

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  • [Back cover]

    Publication Year: 1975, Page(s): c4
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    Freely Available from IEEE
  • Radiation and scattering from loaded bodies of revolution

    Publication Year: 1975, Page(s): 594
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    First Page of the Article
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  • A combination of linear and slot antennas for quasi-isotropic coverage

    Publication Year: 1975, Page(s):572 - 576
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The combination of a linear antenna and slot antenna can be used to provide a relatively isotropic radiation pattern when the dipole is perpendicular to the plane of the slot. The theoretical far-field radiation pattern of a dipole flanked by a two-element array of slot antennas is formulated. The fields for two different phasings between the elements of the combination antenna are calculated and ... View full abstract»

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  • Mechanism of spot dancing

    Publication Year: 1975, Page(s):493 - 497
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The mechanism of spot dancing is clarified by the application of wave theory in a random medium. The solution is based on the moment equation which prescribes the statistical properties of waves scattered successively in the forward direction. Spot dancing is described by the use of wave function; the relation between the spot dancing and the random medium becomes clear. Spot dancing is a limited ... View full abstract»

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  • An impedance sheet approximation for thin dielectric shells

    Publication Year: 1975, Page(s):531 - 534
    Cited by:  Papers (112)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    An approximate equivalence between an impedance loaded surface and a thin dielectric shell is given. This approximation is used to compute the backscattering from a thin circular dielectric tube and the results are compared to the exact solution. Computations for backscattering from a thin dielectric cone-sphere and resonant wire loop inside of a thin dielectric cylinder are also given as further ... View full abstract»

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  • A scattering theory approach to the prediction of dielectric rod antenna radiation patterns: The TM01mode

    Publication Year: 1975, Page(s):577 - 579
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The shortcomings of both the surface integration and the two-aperture approach to the prediction of dielectric rod antenna patterns are well known. An alternative procedure based on a simplified scattering model is presented which is capable of yielding satisfactory results without the necessity of making empirical corrections. View full abstract»

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  • An indirect measurement of the effect dielectric constant and loss tangent of typical concrete roadways

    Publication Year: 1975, Page(s):565 - 569
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The experimental values for the attenuation and phase constant of a two-wire transmission line lying on a concrete roadway are used in conjunction with a model for the transmission line-roadway interface to deduce values of the effective dielectric constant and loss tangent for the roadway material. These are obtained for both dry and wet roadways over a range of frequencies. View full abstract»

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  • On the optimum illumination of arrays

    Publication Year: 1975, Page(s):589 - 590
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    A unified method for the optimization of receiving arrays is presented. The optimization is performed by a linear transformation (coordinate transformation) method. Arrays of lossless arbitrarily arranged in space, but uniformly oriented, elements are analyzed. View full abstract»

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  • Small antennas

    Publication Year: 1975, Page(s):462 - 469
    Cited by:  Papers (211)  |  Patents (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    A small antenna is one whose size is a small fraction of the wavelength. It is a capacitor or inductor, and it is tuned to resonance by a reactor of opposite kind. Its bandwidth of impedance matching is subject to a fundamental limitation measured by its "radiation power factor" which is proportional to its "effective volume". These principles are reviewed in the light of a quarter-century of expe... View full abstract»

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  • The absorption and reradiation of radio waves by oxygen and water vapor in the atmosphere

    Publication Year: 1975, Page(s):595 - 597
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    This is a brief review paper on the interaction of radio waves with oxygen and water vapor in the atmosphere. It is the first of a series of mini-reviews sponsored by the Wave Propagation Standards Committee of IEEE and is intended primarily for those persons who have not had occasion to study extensively in the subject. View full abstract»

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  • An experimental study of the circuit properties of the eccentrically insulated antenna

    Publication Year: 1975, Page(s):579 - 584
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Techniques for measuring the admittance and distributions of current and charge along rotationally symmetrically insulated monopoles in a relatively dense ambient medium have been extended to include eccentrically insulated monopoles. Measured data on the admittance, current, and charge distributions of such monopoles in fresh water are reported and compared with the recently developed theory of W... View full abstract»

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  • Field distribution in a flanged parallel-plate waveguide

    Publication Year: 1975, Page(s):558 - 560
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Field distributions in a flanged parallel-plate waveguide have been computed using the Weber-Schafheitlin integral technique. Equiamplitude and equiphase contours are presented in graphical forms for a specific choice of parameters. View full abstract»

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  • Extended boundary condition integral equations for perfectly conducting and dielectric bodies: Formulation and uniqueness

    Publication Year: 1975, Page(s):546 - 551
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The equivalence theorem is used to derive novel generalized boundary condition (GBC) integral equations for the tangential components of the electric and magnetic fields on the interfaces of a finite number of dielectric or conducting scatterers. Closed surface, plane, and line extended boundary conditions (EBC) equivalent to the GBC are introduced. The GBC integral equations can now be replaced b... 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