IEEE Transactions on Antennas and Propagation

Volume 19 Issue 1 • January 1971

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Displaying Results 1 - 25 of 41
  • [Front cover and table of contents]

    Publication Year: 1971, Page(s): 0
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  • G-AP best paper award for 1969

    Publication Year: 1971, Page(s): 2
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  • Special recognition awards

    Publication Year: 1971, Page(s): 3
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  • Synthesis of shaped-beam radiation patterns using the iterative sampling method

    Publication Year: 1971, Page(s):36 - 41
    Cited by:  Papers (42)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (569 KB)

    The iterative sampling method is introduced for the synthesis of shaped-beam radiation patterns using either line sources or uniformly spaced arrays. Given an original pattern which is some approximation to the desired pattern, a series of correction patterns is added to it. Successive iterations are applied in this manner until the desired performance is achieved. The current distribution is foun... View full abstract»

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  • Possibilities of dimensioning doubly curved reflectors for azimuth-search radar antennas

    Publication Year: 1971, Page(s):52 - 57
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    To produce directional antenna patterns having a shaped beam in one plane such as is required, for instance, in the case of rotating-search radar antennas having a vertical radiation pattern of cosecant-squared shape, doubly curved reflectors are used as a rule. Besides the well-known composition of such reflectors from a stack of strips of parabolic shape, the paper delineates possibilities of an... View full abstract»

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  • Element pattern for circular arrays of waveguide-fed axial slits on large conducting cylinders

    Publication Year: 1971, Page(s):64 - 74
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB)

    Analytical and numerical results are presented for the array element pattern of axial slits in conducting cylinders. The slits are fed by parallel-plate guides in the TEM mode and are matched to free space. Both harmonic series and integral representation for the far-field patterns are obtained and numerically evaluated as a function ofkr_{0}and spacing. The integral representation is t... View full abstract»

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  • Synthesis of linear antenna arrays using Z transforms

    Publication Year: 1971, Page(s):75 - 80
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (565 KB)

    It is well known that a linear antenna array with equally spaced elements can be represented by a polynomial whose roots correspond to the nulls of its antenna pattern. Since the linear array has equally spaced elements, its polynomial has only integral powers of the variable, so that the array can be represented by aZtransform. Therefore, the effect of moving roots of the polynomial ca... View full abstract»

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  • The logarithmic spiral in a single-aperture multimode antenna system

    Publication Year: 1971, Page(s):90 - 96
    Cited by:  Papers (20)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    Then-arm logarithmic spiral antenna havingndistinct terminals may be considered as an (n-1)-port antenna. It may be operated simultaneously in (n-1)independent balanced modes. By varying the relative excitation of these modes it is possible to produce a variety of patterns that have applications to direction finding, tracking, and homing over a broad ran... View full abstract»

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  • Effects of sea reflections on phase of arrival of line-of-sight signals

    Publication Year: 1971, Page(s):105 - 108
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Continuous wave signals at 9.6 GHz were propagated over a 97-km overwater path extending from an elevation of 80 m to 3000 m mean sea level (MSL). Variations in phase of arrival of the signals received by antennas having1.2degand5degbeam widths were recorded simultaneously. With the nominal path elevation angle of1.2deg, the broad-beam antenna received a contributi... View full abstract»

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  • On polynomial approximation of current along thin asymmetrical cylindrical dipoles

    Publication Year: 1971, Page(s):117 - 120
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Isolated asymmetrical cylindrical dipoles and two such parallel nonstaggered identical dipoles are analyzed using a polynomial approximation for current. If the lengths of the two dipole parts do not exceed0.5lambda, numerical results indicate that the simplest second-order polynomial approximation suffices for most purposes. Only if very accurate current distribution is desired, the th... View full abstract»

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  • Backscattering from a thin metallic disk

    Publication Year: 1971, Page(s):143 - 145
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (303 KB)

    An effort recently undertaken to compute radar cross sections of thin metallic disks for frequencies near resonance is described. All calculations are based upon an ideal disk scattering problem in which each disk is assumed to be perfectly conducting and infinitely thin and the incident field is assumed to be an electromagnetic plane wave. A good agreement between the values of the backscattered ... View full abstract»

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  • [Back cover]

    Publication Year: 1971, Page(s): c4
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    Freely Available from IEEE
  • A signal detectability approach to optimization of the geometry of distributed aperture (array) receivers

    Publication Year: 1971, Page(s):22 - 30
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    A technique which allows the analytical specification of optimal array geometry that enhances array reception is developed. The technique is illustrated for small antenna arrays of up to four elements in two classes of interference fields, with and without spatial constraints. The analytical treatment is predicated upon signal detectability and employs error-free arrays of noninteracting nondirect... View full abstract»

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  • Radiation field of spiral antennas employing multimode slow wave techniques

    Publication Year: 1971, Page(s):126 - 128
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The results of both analytical and experimental research in the area of multimode slow wave planar spiral design are reported. This research is directed toward the development of a compact flush-mounted multimode antenna for future space applications. The technique followed in this investigation was to first modify existing analytical models of planar spiral antennas to take into account the effec... View full abstract»

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  • On the realized gain of arrays

    Publication Year: 1971, Page(s):122 - 124
    Cited by:  Papers (10)
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    A theorem concerning the maximum realized gain of arbitrary arrays is proven. The theorem is applied to the specie case of uniformly spaced circular arrays. A gain equivalence between multiple planar and circular arrays is also derived. View full abstract»

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  • Exact design of an array of dipole antennas giving the prescribed radiation patterns

    Publication Year: 1971, Page(s):128 - 129
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The exact method of designing an array of dipole antennas with the prescribed radiation patterns in the magnetic plane is described. The integral of the current distribution, which is expressed according to the improved circuit theory, is set equal to the magnitude of the point source, which is given by the conventional synthesis method. The current distributions and the correct set of driving vol... View full abstract»

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  • Electric field bounds over a phased array aperture

    Publication Year: 1971, Page(s):113 - 115
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    In the following, a bound on the electric field magnitude existing over a phased array antenna is presented. Use of this bound in predicting the power handling capability of the array is discussed. It is shown that, although the overall array is large with respect to wavelength, the narrow beamwidth often required significantly affects the near field over the aperture and just outside the antenna.... View full abstract»

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  • Electromagnetic fields at points near pulse-excited linear antenna

    Publication Year: 1971, Page(s):129 - 131
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    For a finite-length cylindrical monopole antenna mounted vertically on a perfectly conducting ground plane and driven by a dc pulse, the time variation of the electric and magnetic field intensities at points located at distances of the order of the monopole length from the antenna has been computed. The ratio of the monopole length to its radius was assumed to be 904, the source impedance 300 ohm... View full abstract»

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  • On the suppression of radiation nulls and broadband impedance matching of rectangular waveguide phased arrays

    Publication Year: 1971, Page(s):41 - 51
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    Numerical solutions are obtained for the problem of radiation from an infinite array of rectangular waveguides, each of which is loaded with iris at the array aperture. It is shown that the introduction of aperture irises can remove a radiation null in the active element pattern and significantly improve the array performance over a wide frequency band. View full abstract»

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  • Mutual admittance for axial rectangular slots in a large conducting cylinder

    Publication Year: 1971, Page(s):120 - 122
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    An asymptotic expression is derived for the mutual admittance between axial rectangular slots on a large conducting cylinder. The isolation between slots determined from this mutual admittance approximation is compared with that obtained using the admittance from direct numerical integration and with experimental results for a cylinder in free space and in the presence of a simulated thin plasma s... View full abstract»

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  • Scattering from wedge-tapered absorbers

    Publication Year: 1971, Page(s):96 - 104
    Cited by:  Papers (19)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    The scattering of a plane electromagnetic wave, arbitrarily polarized and normally impinging on a wedge-tapered absorbing structure, is theoretically and experimentally studied. The theoretical solution is found in two asymptotic cases: spacing between consecutive edges, small and large with respect to the incident wavelength. In the former case, a transmission line analogy is set up; in the latte... View full abstract»

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  • Ionospheric dispersion of an FM electromagnetic pulse

    Publication Year: 1971, Page(s):152 - 155
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Mathematical relationships are derived for evaluating the effects of a dispersive medium, such as the ionosphere, on an FM Gaussian shape pulse. The distortion of the amplitude, pulse length, and modulation caused by the ionosphere is examined in terms of the integrated electron density along the transmission path and the system parameters of the transmitted signal. View full abstract»

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  • Synthesis of the primary fields of a transmitting feed for a circular reflector

    Publication Year: 1971, Page(s):31 - 36
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A two-dimensional electromagnetic boundary-value problem consisting in the synthesis of the primary fields of a transmitting feed antenna for a circular-cylindrical reflector is considered. A primary field that corrects for the phase aberration of the reflector is synthesized as a sum of circular waves whose common origin is displaced from the center of curvature of the reflector. Limitations on t... View full abstract»

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  • Scattering from graded cylindrical media

    Publication Year: 1971, Page(s):136 - 139
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The transmission line approach is used to describe scattering from a circular cylinder coated with a nonuniform dielectric. Rather simple techniques can be used for obtaining the solution in terms of surface admittance of the inner cylinder. An equivalent circuit for the sheath is a by-product of this approach. Numerical results include graphs of the effect of corrugations on the inner cylinder. View full abstract»

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  • Nonlinear dispersion of electromagnetic transient signals propagating through a partially ionized plasma

    Publication Year: 1971, Page(s):147 - 149
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The propagation of relatively high-power electromagnetic transient signals through a homogeneous, isotropic, and partially ionized plasma medium is discussed. In particular, the nonlinear dispersion of a transient RF signal caused by the dependence of the electron-neutral collision frequency on the electron temperature is studied. Valuable insights into the effects that plasma nonlinearities have ... View full abstract»

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

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Meet Our Editors

Editor-in-Chief                                             Danilo Erricolo