IEEE Transactions on Antennas and Propagation

Issue 1 • January 1975

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Displaying Results 1 - 25 of 33
  • [Front cover and table of contents]

    Publication Year: 1975, Page(s): 0
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    Freely Available from IEEE
  • Ferroscan: Toward continuous-aperture scanning

    Publication Year: 1975, Page(s):15 - 20
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (764 KB)

    Work done severe years ago, which represents a step toward eliminating the necessity for subdividing a phased array aperture into many discrete elements, each with its own phase shifter, is reported on for the first time. A 5-wavelength,Xband horn aperture, partially loaded with ferrite material, was designed and fabricated. The resulting antenna replaces at least 10 conventional phase ... View full abstract»

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  • The trap-loaded cylindrical antenna

    Publication Year: 1975, Page(s):20 - 27
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (931 KB)

    The trap-loaded cylindrical antenna is a cylindrical antenna having one or more traps located in its arms. The traps are either parallel inductor-capacitor circuits or short-circuited transmission line stubs that are designed to be antiresonant (having essentially an infinite input impedance) at some particular frequency. The location and the antiresonant frequency of the traps are selected to enh... View full abstract»

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  • Radar response to vegetation

    Publication Year: 1975, Page(s):36 - 45
    Cited by:  Papers (45)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (899 KB)

    Active microwave measurements of vegetation backscatter were conducted to determine the utility of radar in 1) mapping soil moisture through vegetation and 2) mapping crop types. Using a truck-mounted boom, spectral response data were obtained for four crop types (corn, milo, soybeans, and alfalfa) over the 4-8 GHz frequency band, at incidence angles of0deg-70degin10degsteps,... View full abstract»

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  • Microstrip antennas

    Publication Year: 1975, Page(s):90 - 93
    Cited by:  Papers (182)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (519 KB)

    Microstrip antennas consist of a planar resonant radiating element parallel to, but separated, from a ground plane by a thin dielectric substrate (t ll lambda). These antennas are very thin and consequently rugged and easy to mount. They may be fed from the back through the ground plane or from the edge by depositing microstrip lines on the dielectric substrate. Several varieties of mic... View full abstract»

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  • A corrugated horn antenna using V-shape corrugations

    Publication Year: 1975, Page(s):93 - 97
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (556 KB)

    Corrugated horns use corrugations on theE-plane walls that are operating in the cutoff condition. In this paper, attention is focussed on replacing the rectangular shaped corrugation with a V-shaped corrugation. The properties of the V corrugations are obtained using an integral equation solution; the results of the computational studies indicate that for operation of the V corrugations... View full abstract»

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  • A thin wall leaky waveguide antenna

    Publication Year: 1975, Page(s):107 - 112
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (597 KB)

    A thin wall leaky waveguide antenna (TLA) obtained by replacing one of the narrow walls of a rectangular waveguide by a film of metal with thickness less than the skin depth is discussed. The radiation pattern for TLA has been evaluated by using Kirchhoff-Huygens approach. In using this method, the dispersion relation has been solved for the complex propagation constants in a parallel plate wavegu... View full abstract»

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  • Propagation predictions and studies using a ray tracing program combined with a theoretical ionospheric model

    Publication Year: 1975, Page(s):132 - 136
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (506 KB)

    Radio wave propagation predictions are described in which modern comprehensive theoretical ionospheric models are coupled with ray-tracing programs. In the computer code described, a network of electron density and collision frequency parameters along a band about the great circle path is calculated by specifying the transmitter and receiver geographic coordinates, time, the day number, and the 28... View full abstract»

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  • Correction to "Surface Currents, Scattering, and Applications in the Rayleigh Region"

    Publication Year: 1975, Page(s): 147
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (77 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1975, Page(s): c4
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    Freely Available from IEEE
  • Some important parameters in the design of T-bar fed slot antennas

    Publication Year: 1975, Page(s):97 - 100
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (480 KB)

    Although the T-bar fed slot antenna is not new, little information is available that would enable one to systematically design such an antenna. It is the purpose of this paper to determine the important parameters in the design process and what tradeoffs may be made among bandwidth, low VSWR, and physical size. View full abstract»

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  • Radar cross section of axisymmetric objects

    Publication Year: 1975, Page(s):118 - 122
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (600 KB)

    A method for computing the resonant region scattering by slender axisymmetric objects with arbitrary surface impedance is outlined. This method employs matching of the electric and magnetic fields on axis. Results obtained by this method have been used to generate contour maps of radar cross section (RCS) as a function of frequency and aspect. Maps for three conducting cones and a cone-spheroid co... View full abstract»

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  • Synthesis of the antenna pattern for a radiating slot in a metal cylinder

    Publication Year: 1975, Page(s):28 - 36
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (832 KB)

    The synthesis of a prescribed far-field pattern by means of a radiating slot in a perfectly conducting infinite circular cylinder is considered. The narrow circumferential slot and the infinite axial slot are studied in detail. In either case, the problem is to find the distribution of the electromagnetic field in the aperture that yields a radiation pattern that is the best mean-square approximat... View full abstract»

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  • Reflection of electromagnetic waves from oscillating surfaces

    Publication Year: 1975, Page(s):122 - 127
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (624 KB)

    The problem of reflection of electromagnetic waves from oscillating surfaces is discussed. Using the induction theorem, the interface is replaced by equivalent current sources that radiate into an unbounded medium. Spatial movement is ascribed to these sources to account for oscillations of the surface. The general solution for the far-field due to any arbitrary surface motion is developed. A few ... View full abstract»

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  • Sufficient conditions for the existence of optimum beam patterns for unequally spaced linear arrays with an example

    Publication Year: 1975, Page(s):112 - 115
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (464 KB)

    Dolph's method for determining the optimum element currents for half-wavelength equispaced discrete linear arrays is generalized to symmetric discrete linear arrays. The theorem proved gives sufficient conditions for the existence of optimum beam patterns for arrays with elements symmetrically positioned about the array center, but with fixed unequal spacings between the elements. The conditions a... View full abstract»

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  • A method for the determination of ionospheric vertical profiles through beacon satellite measurements

    Publication Year: 1975, Page(s):129 - 132
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (432 KB)

    A method is described for the determination of the parameters of an assumed ionospheric profile from a given measured impulse response function. In the considered examples the measured data are simulated by ray tracing techniques and the least mean square method is applied iteratively to solve the inverse problem. Measurements errors and horizontal dependence of the ionospheric profile are also co... View full abstract»

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  • Optimum element lengths for Yagi-Uda arrays

    Publication Year: 1975, Page(s):8 - 15
    Cited by:  Papers (54)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (696 KB)

    An analytical method is developed for the maximization of the directivity of a Yagi-Uda array by adjusting the lengths of the dipole elements. The effects of a finite dipole radius and the mutual coupling between the elements are taken into consideration. Currents in the array elements are approximated by three-term expansions with complex coefficients that convert the governing integral equations... View full abstract»

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  • Prediction of active array impedance from simulator measurements using rounded ramp function interpolation

    Publication Year: 1975, Page(s):140 - 141
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (256 KB)

    In order to extend the active reflection coefficient of a phased array to general scan angles from measurements on a multielement phased array waveguide simulator, a new interpolation technique using rounded ramp functions (RRPF's) is presented. The interpolation formula is tested on an array, simulated by a 25-element simulator, with stripline-fed slots as radiating elements. Contour plots showin... View full abstract»

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  • Antenna temperature for a scanning microwave radiometer

    Publication Year: 1975, Page(s):141 - 144
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (392 KB)

    Expressions for the antenna temperature are derived for a scanning Earth-viewing satellite-borne microwave radiometer. The result is in the form of an integral that includes the antenna gain function and brightness temperature. A composite emissivity term appears in the brightness temperature equation that contains the horizontal and vertical components of surface emissivity weighted by their resp... View full abstract»

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  • Reflection of pulse by multiple-dielectric layers

    Publication Year: 1975, Page(s):127 - 129
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (344 KB)

    The reflection of a pulse by two dielectric slabs is treated both analytically and numerically. The reflected wave is obtained by expanding the reflection coefficient of an elementary plane wave in a series, including the special case for which total reflection occurs. The effect of the carrier frequency of a pulse-modulated carrier wave on the reflected wave form is also discussed. View full abstract»

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  • EM modeling of aircraft at low frequencies

    Publication Year: 1975, Page(s):53 - 56
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (352 KB)

    An efficient computational technique for obtaining scattering cross sections of electrically small aircraft is presented. The technique is based on the wire-grid reaction method. The aircraft shape is approximated by a grid of thin wires, leading to a mathematical representation of the aircraft in the form of an impedance matrix. The inverted matrix yields the scattering data. A variety of wire-gr... View full abstract»

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  • Design of line source antennas for narrow beamwidth and asymmetric low sidelobes

    Publication Year: 1975, Page(s):100 - 107
    Cited by:  Papers (25)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (776 KB)

    A design method is described for the creation of line sources that will yield antenna patterns consisting of a narrow main beam and low sidelobes, with the sidelobe levels different on the two sides of the main beam. The requisite aperture distribution is shown to be symmetrical in amplitude and asymmetrical in phase. Main beam offset and the characteristics of the associated difference pattern ar... View full abstract»

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  • The effect of tolerances on the isolation of frequency reuse antennas

    Publication Year: 1975, Page(s):115 - 118
    Cited by:  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (432 KB)

    The expression for the expected isolation between two orthogonally polarized signals of a single beam frequency reuse array antenna when excitation, position, and orientation of the elements are subjected to independent random variables is derived. The isolation loss and the fundamental limitation of a multibeam frequency reuse antenna system are discussed. View full abstract»

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  • Trees performing as radio antennas

    Publication Year: 1975, Page(s):137 - 140
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (632 KB)

    Radio transmission and reception experiments conducted in a tropical jungle are described. The performance of conventional whip antennas is compared with the performance of trees utilized as antennas in conjunction with hybrid electromagnetic antenna couplers (HEMAC's). The trees were found to outperform the whip in some cases by up to 20 dB. View full abstract»

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  • Antenna scanning technique to improve troposcatter system performance

    Publication Year: 1975, Page(s):146 - 147
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (224 KB)

    This is a new technique proposed to improve the performance of a troposcatter system. In this technique, the transmitting or receiving antenna, or both, are continuously scanning the space to find the scattering volume that produces the optimal signal strength. The overall effect is to reduce both short-term and long-term fadings. It is equivalent to a combination of using selection angle diversit... 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