IEEE Transactions on Antennas and Propagation

Issue 1 • January 1974

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Displaying Results 1 - 25 of 38
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): 0
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  • Preface

    Publication Year: 1974, Page(s):1 - 3
    Cited by:  Papers (8)
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  • Analysis of periodic arrays of waveguide apertures on conducting cylinders covered by dielectric

    Publication Year: 1974, Page(s):25 - 34
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (899 KB)

    The analysis of infinite arrays of waveguide apertures on cylinders covered by a dielectric is approached by enforcing the continuity of the EM fields at the air-dielectric and at the dielectric-cylinder interfaces. The continuity of the EM fields at the first interface is enforced by representing the fields in the air and in the dielectric by an orthonormal set of modes LSE and LSM with respect t... View full abstract»

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  • Design of a small conformal array

    Publication Year: 1974, Page(s):64 - 70
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (626 KB)

    The principal objective of this investigation was to determine how to efficiently excite a small conical body over a 2:1 frequency bandwidth such that a prescribed minimun value of gain is exceeded in a60degconical sector about the forward axis of the cone. To achieve the necessary bandwidth, two approaches have been considered. First, an electrically small moderately efficient tunable ... View full abstract»

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  • An electronically despun array flush-mounted on a cylindrical spacecraft

    Publication Year: 1974, Page(s):71 - 74
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (572 KB)

    A conformal array is presented that provides, by means of single-pole multithrow switches and microstrip power dividers, either an omnidirectional or an electronically despun directional radiation pattern. Switching techniques for scanning the directional pattern of circular arrays are discussed. The design parameters and measured results of an experimental 64-element array flush-mounted on a cyli... View full abstract»

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  • Circularly symmetric RF commutator for cylindrical phased arrays

    Publication Year: 1974, Page(s):78 - 81
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (498 KB)

    A new feed concept is described which greatly simplifies the problem of commutating the RF distribution system of a cylindrical phased array. The feed consists of a circular parallel-plate radial transmission line with a central set of probes and a ring of peripheral probes. The array of probes in the center can be phased to produce an amplitude distribution in the parallel-plate line in any given... View full abstract»

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  • Wide-angle scanning of linear arrays located on cones

    Publication Year: 1974, Page(s):97 - 103
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (659 KB)

    The characteristics of an 8-element linear array located along the generatrix of a cone with a20degfull cone angle is described. The array is scanned from broadside to a direction parallel to the cone axis. Radiation patterns and admittances are measured over wide scan angles. Theoretical calculations are performed for a similar array located on an infinite groundplane. The agreement be... View full abstract»

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  • On optimum synthetic linear arrays with application to radioastronomy

    Publication Year: 1974, Page(s):108 - 109
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (246 KB)

    We show thatnantennas may be used asmsuccessive linear arrays to give, without redundancy, all the spacings from 1 throughm n(n - 1)/2, form = 4andn = 3, m = 5, andn = 3, andm = 4andn = 4. For every case, solutions are given requiring the minimum number of stations. View full abstract»

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  • A leaky-wave antenna using an artificial dielectric medium

    Publication Year: 1974, Page(s):119 - 122
    Cited by:  Papers (55)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (395 KB)

    A narrow-beam antenna using an artificial dielectric medium with effective permittivity less than unity has been investigated theoretically and experimentally. Complex propagation constant for a wave propagating along the structure is evaluated by solving the dispersion relation. The analysis indicates the presence of a leaky-wave mode. The radiation pattern is calculated by using Kirchhoff-Huygen... View full abstract»

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  • High temperature RF transmission tests on EM windows conducted at the French solar furnace

    Publication Year: 1974, Page(s):129 - 132
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (307 KB)

    TheXband transmission data of electromagnetic antenna window materials exposed to heat fluxes of magnitude 200 cal/cm2cdots to 400 cal/cm.2s are presented. The measurements were performed at the solar furnace of the Centre National de la Recherche Scientifique, Odeillo, France. The purpose of the tests was to analyze material performance under a very hig... View full abstract»

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  • Plasma density determination

    Publication Year: 1974, Page(s):140 - 142
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (265 KB)

    An approach to the indirect probing of inhomogeneous plane stratified plasmas is presented which, within numerical limitations, yields unique electron density profiles. It has been shown that the density profile and the reflected wave generated by adelta- function incident electric field are uniquely related by a Fredholm integral equation. The integral equation is solved numerically by... View full abstract»

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  • Application of state-space method to scattering from plane-stratified media

    Publication Year: 1974, Page(s):142 - 145
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (421 KB)

    An explicit expression is derived for the surface impedance of a half-space composed of two layers. The upper layer is assumed to be arbitrarily inhomogeneous. The bottom layer, which is of infinite thickness, is assumed to be homogeneous. The expression contains the state-transition matrix elements associated with the upper layer. This matrix is determined numerically and analytically for rapidly... View full abstract»

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  • [Back cover]

    Publication Year: 1974, Page(s): c4
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    Freely Available from IEEE
  • Scalar analysis of nonsymmetrically distorted umbrella reflector

    Publication Year: 1974, Page(s):112 - 114
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (296 KB)

    An approximation technique for analyzing nonsymmetrically distorted umbrella reflectors is presented which offers savings in computer time by a factor of twice the number of gores. The surface distortions are described by incorporating an additional path-length phase factor into the illumination function. By expanding this phase factor in a finite Fourier series and neglecting Bessel functions of ... View full abstract»

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  • Application of an integral equation formulation to the prediction of space shuttle annular slot antenna radiation patterns

    Publication Year: 1974, Page(s):109 - 111
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (376 KB)

    Pitch and roll plane radiation patterns computed by use of an integral equation formulation are presented for a space shuttle annular slot communications antenna. The excellent agreement between computed patterns and experimental patterns obtained from 1/35 scale models supports the use of this method as a design tool for similar spacecraft/aircraft antenna applications. View full abstract»

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  • Optimization of array performance subject to multiple power pattern constraints

    Publication Year: 1974, Page(s):103 - 105
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (384 KB)

    Many antenna array performance indices can be expressed as ratios of Hermitian quadratic forms in the element excitation coefficients. A method is presented for the optimization of such performance indices with respect to the excitation coefficients and subject to multiple nonzero constraints on the array power pattern. The optimum excitation vector is shown to satisfy a characteristic equation wi... View full abstract»

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  • Wind dependence of quasi-specular microwave sea scatter

    Publication Year: 1974, Page(s):135 - 136
    Cited by:  Papers (72)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (288 KB)

    It is shown that a specular-point scattering model adequately predicts the relation between the average quasi-specular microwave scattering cross section of the sea and the mean wind speed. The mean-square sea slope required in this model varies with both the upper and lower ends of the waveheight spectrum, which in themselves are functions of wind speed. Optical measurements of slopes confirm thi... View full abstract»

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  • Mutual coupling analysis of arrays of apertures on cones

    Publication Year: 1974, Page(s):92 - 97
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (584 KB)

    The analysis of the element pattern in an array of waveguide elements on a cone is approached by systematically exploiting the geometrical symmetry of the structure. The method consists of decomposing the arbitrary array excitation into fundamental excitations (eigenexcitations) for which the solution of the electromagnetic problem is simpler than in the general case. Following Bailin and Silver, ... View full abstract»

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  • Application of the impedance sheet concept to thin periodically varying dielectrics

    Publication Year: 1974, Page(s):127 - 128
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (232 KB)

    The impedance sheet concept used to predict the transmission and reflection properties of thin dielectrics is extended to determine the transmission and reflection properties of thin periodically varying dielectrics. For plane-wave incidence, the effect of the periodic interface is to generate a higher order modal distribution on both sides of the boundary. It is shown that situations exist where ... View full abstract»

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  • Antenna array directional patterns

    Publication Year: 1974, Page(s): 147
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    The author describes a computer system to map or draw graphs, on a line printer, of the responses of arrays as a function of incident angle. He discusses digital storage requirements View full abstract»

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  • Scattering from an elliptic cylinder loaded with an active or passive continuously variable surface impedance

    Publication Year: 1974, Page(s):132 - 134
    Cited by:  Papers (10)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (288 KB)

    Recently it has been shown that a plane wave reflected from an active surface may be amplified [1]. The active surface was theoretically assumed to be a corrugated planar structure with slots properly loaded with negative conductance material (e.g., Gunn, tunnel, or IMPATT diodes). If the corrugations are sufficiently close, such surfaces, whether active or passive, can be modeled in terms of an e... View full abstract»

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  • Short pulse response of a circular loop

    Publication Year: 1974, Page(s):114 - 116
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (320 KB)

    High-frequency responses of circular ring antennas and scattering structures are presented. The responses were calculated numerically by a time-domain moment method. The low-frequency inductance of a circular ring can be found by using the steady-state current resulting from an applied voltage with a nonzero dc level View full abstract»

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  • Ray analysis of conformal antenna arrays

    Publication Year: 1974, Page(s):49 - 63
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1512 KB)

    The aperture design of conformal arrays is predicated on the knowledge of the element patterns and coupling coefficients in a mutually coupled environment. For equispaced identical slits on a perfectly conducting cylinder, a previous analysis has utilized the modal theory of periodic structures to simplify the calculations. Modal procedures are rather difficult to apply when the array surface has ... View full abstract»

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  • An analysis of the radiation from circular arrays of directive elements

    Publication Year: 1974, Page(s):84 - 87
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (400 KB)

    A simple analytic formula for the radiation of the angular harmonics excited by a large cylindrical array is derived. The dependence of the phase on elevation angle and cylinder diameter relative to a wavelength is shown and compared to an exact solution. The difference between a continuous distribution and discrete array is presented; and the angular phase perturbations produced by the discrete a... View full abstract»

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  • A theory of antenna array conformal to surfaces of revolution

    Publication Year: 1974, Page(s):87 - 91
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (496 KB)

    For a conformal array of nonparallel radiators the classical array theory fails to offer a convenient way for calculating the array pattern and its cross-polarized counterpart. This study shows that under a wide range of conditions, these patterns can be simply obtained from the array space factor by partial differentiation. The scalar space factor of an array, therefore, can be considered as a ge... 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