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Antennas and Propagation, IEEE Transactions on

Issue 1 • Date 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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    Freely Available from IEEE
  • Preface

    Publication Year: 1974 , Page(s): 1 - 3
    Cited by:  Papers (7)
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1974 , Page(s): c4
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    Freely Available from IEEE
  • 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 (4)  |  Patents (4)
    Save to Project icon | Request Permissions | 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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  • Wind dependence of quasi-specular microwave sea scatter

    Publication Year: 1974 , Page(s): 135 - 136
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | 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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  • Approximation techniques for the mutual admittance of slot antennas on metallic cones

    Publication Year: 1974 , Page(s): 43 - 48
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (568 KB)  

    The effect of scattering from a sharp tip on mutual admittance is investigated for pairs of circumferential and radial slots on a semi-infinite metallic cone. Mutual coupling measurements as a function frequency and angular separation are presented and compared with numerical calculations. The base of the conical model used in the experimental study was terminated in a spherical cap to minimize sc... 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)
    Save to Project icon | Request Permissions | 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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  • A leaky-wave antenna using an artificial dielectric medium

    Publication Year: 1974 , Page(s): 119 - 122
    Cited by:  Papers (25)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (408 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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  • An analysis of the radiation from circular arrays of directive elements

    Publication Year: 1974 , Page(s): 84 - 87
    Save to Project icon | Request Permissions | 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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  • Large reflector antenna pattern computation using moment methods

    Publication Year: 1974 , Page(s): 116 - 118
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (336 KB)  

    A technique, whereby the radiation patterns of large size reflector antennas can be approximated by computers using a moment method without excessive computer time or memory, is described. Computational time increases only linearly with antenna size. There is no limit on the minimum reflector size (a single wire reflector can be analyzed). An example is discussed showing the radiation patterns of ... View full abstract»

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  • Scalar analysis of nonsymmetrically distorted umbrella reflector

    Publication Year: 1974 , Page(s): 112 - 114
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | 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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  • Conformal microstrip antennas and microstrip phased arrays

    Publication Year: 1974 , Page(s): 74 - 78
    Cited by:  Papers (168)  |  Patents (26)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (592 KB)  

    A new class of antennas using microstrips to form the feed networks and radiators is presented in this communication. These antennas have four distinct advantages: 1) cost, 2) performance, 3) ease of installation, and 4) the low profile conformal design. The application of these antennas is limited to small bandwidths. Phased arrays using these techniques are also discussed. 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)
    Save to Project icon | Request Permissions | 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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  • Optimization of array performance subject to multiple power pattern constraints

    Publication Year: 1974 , Page(s): 103 - 105
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | 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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  • Design of a small conformal array

    Publication Year: 1974 , Page(s): 64 - 70
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (640 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 a 60\deg conical sector about the forward axis of the cone. To achieve the necessary bandwidth, two approaches have been considered. First, an electrically smal... 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 (3)
    Save to Project icon | Request Permissions | 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 state-space method to scattering from plane-stratified media

    Publication Year: 1974 , Page(s): 142 - 145
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (432 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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  • An electronically despun array flush-mounted on a cylindrical spacecraft

    Publication Year: 1974 , Page(s): 71 - 74
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (584 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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  • Propagation velocity of whistler-mode signals in an unstable and abnormally dispersive plasma-beam system

    Publication Year: 1974 , Page(s): 136 - 140
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (536 KB)  

    A propagation velocity of a whistler-mode signal in an unstable and abnormally dispersive plasma-beam system was investigated. Responses of the plasma in real time and space were computed by the inverse Fourier-Laplace transformation. The computed results of the propagation velocity are compared with various velocities analytically determined from the dispersion equation. View full abstract»

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  • Diffusion of electromagnetic pulses into the earth from a line source

    Publication Year: 1974 , Page(s): 145 - 146
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (208 KB)  

    The subsurface electromagnetic fields of a line source with a delta function current are considered. All displacement currents are neglected. The time-dependent electric and magnetic fields at the buried observer are illustrated. The resulting waveforms all have a leading spike followed by a slowly decaying tail of opposite polarity. The results have possible application to downlink signaling in m... View full abstract»

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  • An electronically scanned beacon antenna

    Publication Year: 1974 , Page(s): 3 - 12
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (936 KB)  

    An electronically scanned cylindrical array having a minimum number of active devices has been designed. A saving of over 3 to 1 in diode elements as compared to conventional approaches has been achieved. In addition to providing instantaneous positioning to any azimuth direction, a constant azimuth beamwidth for an elevation fan beam has been realized. Extremely low azimuth sidelobes are obtained... View full abstract»

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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 (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (912 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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  • Tumble-average radar backscatter of some thin-wire chaff elements

    Publication Year: 1974 , Page(s): 124 - 126
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (304 KB)  

    With sinusoidal bases and Galerkin's method, the tumble-average radar backscatter is computed for parallel wires, crossed wires, a planar tripod, and a regular quadripod. This communicalion presents calculated and measured results. One of the configurations, the quadripod, demonstrates attractive tumble-average properties for use as a chaff element. 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
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (320 KB)  

    The X band transmission data of electromagnetic antenna window materials exposed to heat fluxes of magnitude 200 cal/cm2 \cdot s 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... View full abstract»

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  • Short pulse response of a circular loop

    Publication Year: 1974 , Page(s): 114 - 116
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | 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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Aims & Scope

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

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Meet Our Editors

Editor-in-Chief                                                 Kwok W. Leung