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Antennas and Propagation, IEEE Transactions on

Issue 4 • Date July 1969

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Displaying Results 1 - 20 of 20
  • [Front cover and table of contents]

    Publication Year: 1969, Page(s): 0
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    Freely Available from IEEE
  • Preface

    Publication Year: 1969, Page(s): 406
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1969, Page(s): c4
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    Freely Available from IEEE
  • Pattern synthesis of circular arrays in a moving medium

    Publication Year: 1969, Page(s):524 - 526
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Based on a modified expression for the radiation field of a circular array in a moving medium, pattern synthesis is performed for medium motion both in the direction of and parallel to the main beam. It is shown that medium motion, even considering only first-order effects, changes the synthesized patterns significantly. The required excitation amplitudes and phases for the proper synthesis of a 2... View full abstract»

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  • VHF antenna systems for spin-stabilized satellites

    Publication Year: 1969, Page(s):443 - 451
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1168 KB)

    Lincoln Laboratory has developed two circularly polarized VHF antenna systems for use on spin-stabilized satellites, Both are described, and test results are discussed. One is a low-gain (3-dB) antenna with omnidirectional coverage in the equatorial plane. The second is a high-gain (10-dB) antenna with a despun beam electronically scanned to always be Earth directed. Development of the component d... View full abstract»

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  • A probabilistic approach to large circular and spherical arrays

    Publication Year: 1969, Page(s):514 - 522
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    Antenna arrays with elements distributed at random in a three-dimensional space are studied. Arbitrary excitation and nonisotropic elements are considered. The distribution of the sidelobe level below a certain value for all directions of observation, as well as other probabilistic properties are determined approximately. These general results are then applied to circular and spherical arrays. In ... View full abstract»

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  • Relativistic communications effects associated with moving space antennas

    Publication Year: 1969, Page(s):484 - 488
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Future space missions may require vehicles traveling at relativistic velocities. Consequently, relativistic effects will have to be considered in the development of future space communication systems. This paper presents a formulation of these relativistic communication effects which are not normally encountered by the designer. The gain function, power density available at the receiver and appare... View full abstract»

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  • Large-aperture expandable truss microwave antenna

    Publication Year: 1969, Page(s):452 - 458
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    A space erectable truss antenna concept capable of deploying a rigid, lightweight (0.1 lb/ft2of aperture), parabolic reflector from 5 to 300 feet in diameter is discussed. A three-dimensional spring-loaded truss retracts into three optional packaging configurations, such that, a 100-foot diameter antenna can be packaged into a 10-foot payload envelope. Depth of the deployed antenna trus... View full abstract»

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  • Multifunction single-package antenna system for spin-stabilized near-synchronous satellite

    Publication Year: 1969, Page(s):435 - 442
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    An antenna system is described for a spin-stabilized satellite with its axis normal to the orbital plane. Three antennas in a compact lightweight package comprise the antenna system: a switched-beam X -band transmitting antenna, an omnidirectional X -band receiving antenna and an omnidirectional VHF telemetry antenna. The firs... View full abstract»

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  • An omnidirectional microwave antenna for use on spacecraft

    Publication Year: 1969, Page(s):459 - 466
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    The qualitative theory, design, and development of a parallel-plate waveguide-fed antenna, suitable for flush-mounted broad-band spacecraft applications, are presented. The antenna makes use of wedge-like metal posts placed uniformly about the periphery of the feed plates to provide both structural strength and practical interconnection routes for cables without disrupting the antenna impedance an... View full abstract»

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  • ATS mechanically despun communications satellite antenna

    Publication Year: 1969, Page(s):415 - 428
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1504 KB)

    The antenna system described is one of the experiments on NASAs ATS-III spin stabilized satellite that was launched on November 5, 1967. It was put into synchronous orbit shortly thereafter and has been operating satisfactorily since. Using a line source feed illuminating a parabolic cylindrical reflector, a linearly polarized gain over 17 dB is achieved. The antenna is positioned by means of a ve... View full abstract»

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  • Radiation from a circularly polarized antenna through the ionized wake of a Mars-entry capsule

    Publication Year: 1969, Page(s):488 - 495
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    The effects of the ionized wake-of a Mars-entry capsule on radiation from a circularly polarized antenna operating at 400 and 2295 MHz are studied. The circularly polarized antenna is represented by a turnstile antenna \lambda /4 above a ground plane, while the ionized wake is approximated by a cylindrically stratified plasma consisting of View full abstract»

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  • Aperture radiation from an axially slotted elliptical conducting cylinder using geometrical theory of diffraction

    Publication Year: 1969, Page(s):507 - 513
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    The equatorial radiation pattern of a parallel-plate TEM mode axial slot on an infinite cylinder of elliptical cross section is computed using wedge-diffraction and creeping-wave theory. The wedge-diffracted fields are obtained by the diffraction interaction from a set of infinite wedges approximating the parallel-plate-cylinder geometry. Surface-wave propagation on curved bodies commonly used in ... View full abstract»

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  • Monopole and conic antennas on spherical vehicles

    Publication Year: 1969, Page(s):477 - 484
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The radiation and impedance characteristics of a spherically capped conic antenna protruding from a spherical vehicle are studied as a function of cone height, cone angle, and diameter of the vehicle. The conic antenna is excited by a gap at the cone base. The excitation is assumed rotationally symmetric. Considered in detail is the thin conical monopole extending from a sphere. The radiation patt... View full abstract»

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  • A deployable cross LPD array on a conducting cone

    Publication Year: 1969, Page(s):428 - 435
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    A deployable cross log periodic dipole (LPD) array on a conducting cone has been designed and tested at M.I.T. Lincoln Laboratory as part of the RSP (Reentry Systems Program) flight program. This paper presents a brief mechanical description and an electrical performance of this LPD array. The electrical property of the antenna was fouud to be quite good within the frequency band designed. The gro... View full abstract»

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  • Radiation characteristics of a cavity-backed cylindrical gap antenna

    Publication Year: 1969, Page(s):467 - 477
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    The input impedance and the equatorial radiation patterns of a VHF cavity-backed cylindrical gap antenna are derived and compared with experiments. The experiments generally support the computations, provided that the gap dimension is neither larger than about 1/100 of a wavelength, nor so thin that mechanical tolerances in the feed design become important. The results show that the tuning, impeda... View full abstract»

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  • Spacecraft phased array configurations

    Publication Year: 1969, Page(s):522 - 524
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Ideas of spacecratt phased array configurations are described in this communication. The aperture of the phased array is 28.5 by 28.5 feet. View full abstract»

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  • Performance analysis of planar hybrid matrix arrays

    Publication Year: 1969, Page(s):526 - 528
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    An analysis is presented of overall aperture efficiency, weight, and control power requirements for hybrid matrix arrays in synchronous satellite applications. An array is described which is mounted on a 7-foot aperture in a triangular grid fashion and fed by a hybrid matrix consisting of 3-port building blocks which in turn are fed by 9-port matrices. The beam crossover loss is minimized by beam ... View full abstract»

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  • Prolate spheroidal antennas in isotropic plasma media

    Publication Year: 1969, Page(s):496 - 506
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    The problems of a gap-excited finite-sized prolate spheroidal antenna, with and without a confocal prolate spheroidal vacuum sheath, operated in a uniform cold and in a uniform warm lossy plasma medium, have been considered by applying boundary value problem techniques. The dependence of the input admittance, the current distribution, and the radiation pattern, upon the collision frequency, the el... View full abstract»

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  • The design of the mechanically despun antenna for the Intelsat III communications satellite

    Publication Year: 1969, Page(s):407 - 415
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    The use of a spin-stabilized communications satellite of large channel capacity requires a high-gain antenna which may be despun, mechanically or electronically, with respect to the satellite. The design of a mechanically despun antenna system for the Intelsat-III communications satellite is discussed. The communications signals utilize a high-gain directive antenna which is mechanically despun wh... 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