IEEE Transactions on Antennas and Propagation

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
  • Rudimentary horn antenna

    Publication Year: 1971, Page(s):124 - 126
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (368 KB)

    Preliminary results obtained from an investigation of the impedance and radiation properties of a novel broadband linearly polarized antenna called the rudimentary horn are reported. When properly designed the antenna is found to be capable of maintaining its desirable radiation and impedance characteristics over a 10:1 band of frequencies. View full abstract»

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  • Reflector efficiency evaluation by frequency scaling

    Publication Year: 1971, Page(s):58 - 63
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (624 KB)

    In recent evaluations of large parabolic reflector antennas, engineers have investigated the antenna performance at several frequencies. In this paper it is shown that the efficiency at any frequency can be estimated from a measured efficiency at another frequency and a carefully calculated design efficiency. In practice, an efficiency measurement at some frequency usually serves to determine the ... 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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  • Efficiency of a radiating element in circular cylindrical arrays

    Publication Year: 1971, Page(s):115 - 117
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (288 KB)

    The general theory interrelating active reflection coefficient and element efficiency or realized gain for arbitrary antenna arrays is applied to circular cylindrical arrays. An upper bound corresponding to the exclusion of supergain is obtained. 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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  • Nonlinear reflection and transmission of electromagnetic waves by moving plasmas

    Publication Year: 1971, Page(s):145 - 147
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    Based on the covariance principle of Maxwell's equations and phase-invariance principle (derived from the special theory of relativity), expressions for the nonlinear reflection and transmission of electromagnetic waves from weakly ionized plasmas moving perpendicular to the interface have been obtained. It is seen that the effect of nonlinearity is quite appreciable even when the electromagnetic ... 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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  • Traveling wave arrays of mismatched elements

    Publication Year: 1971, Page(s):4 - 11
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (752 KB)

    Normal design practice for traveling wave arrays assumes that radiating elements cause negligible mismatch to the transmission line feed. This assumption cannot be made for tightly coupled or largely reactive radiating elements. An analysis is given for calculating element resistances and spacings which will produce an aperture distribution with the desired amplitude and linear phase in the presen... View full abstract»

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  • On the realized gain of arrays

    Publication Year: 1971, Page(s):122 - 124
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    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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  • On the reflection properties of periodically supported metallic wire gratings with rectangular mesh showing small sag

    Publication Year: 1971, Page(s):109 - 113
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (760 KB)

    Ideal reflector simulation of wire gratings is considered. Results for infinite plane gratings under linearly polarized plane waves, based on Astrakhan's averaged boundary conditions, yield conclusions on influence of wire orientation, mesh size, and wire connection. The grating sag is considered. Its influence on strength and phase shift of the reflection is estimated from a simple scatter proble... View full abstract»

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  • Electromagnetic backscattering from thin conductive films

    Publication Year: 1971, Page(s):141 - 143
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (328 KB)

    The radar backscattering from thin conductive films is examined and an expression which provides an indication of the loss in cross section as a function of layer thickness is derived. Experimental results are given for aluminum and nickel, as obtained from anechoic chamber measurements. It is indicated that a metallic film of only a few thousandths of a skin depth is all that is necessary to prov... View full abstract»

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  • Kinetic theory of electromagnetic waves obliquely incident upon a plasma slab

    Publication Year: 1971, Page(s):81 - 90
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (784 KB)

    The problem of an electromagnetic wave obliquely incident upon a plasma slab is considered as a boundary-value problem, using a self-consistent solution of the coupled linearized Vlasov and Maxwell equations for the electrons, with the ions treated as a fixed, uniform background. Power reflection, transmission, and absorption coefficients are derived under the assumption that electrons undergo spe... View full abstract»

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  • Admittance of an aperture antenna radiating into a warm plasma half-space

    Publication Year: 1971, Page(s):150 - 151
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (232 KB)

    An expression is derived for the admittance of an aperture radiating into a lossy warm overdense plasma half-space. The result is examined in the limiting cases of low and high electron temperatures. 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