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IEEE Transactions on Antennas and Propagation

Issue 6 • November 1969

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Displaying Results 1 - 25 of 35
  • [Front cover and table of contents]

    Publication Year: 1969, Page(s): 0
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    Freely Available from IEEE
  • Radio frequency noise during reentry

    Publication Year: 1969, Page(s):786 - 790
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    In flight, measurements of the effective noise temperature of a reentry plasma are compared with computed data. The vehicle utilized for the experiment was the Trailblazer II. The measurements were made at a frequency of 2235 MHz and transmitted to the ground in real time byX-band telemetry. Noise temperatures in excess of5000degK were recorded. The flight data also demonstra... View full abstract»

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  • Influence of inclination angles for antennas buried in Arctic terrain on space wave radiation

    Publication Year: 1969, Page(s):790 - 795
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (534 KB)

    Space wave radiation fields for an inclined electric dipole antenna in Arctic and Antarctic terrain are formulated with the results from superposition of fields for horizontal and vertical dipoles. Boundary conditions and the Fourier-Bessel transforms are applied to the wave equations in each layer of the multilayer media used as the terrain model. Integral expressions are obtained in closed form ... View full abstract»

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  • Use of the Lorentz reciprocity theorem for the design and evaluation of feeds for reflectors

    Publication Year: 1969, Page(s):813 - 814
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (233 KB)

    First Page of the Article
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  • On the admittance of a monopole driven from a coaxial line

    Publication Year: 1969, Page(s):814 - 817
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (437 KB)

    A simple formula is described for the apparent admittanceY(ka, b/a)of a monopole of fixed lengthhand radiusawhen driven from a coaxial line (conductor radiibanda). IfY(ka, b/a)is known atnvalues ofkawithb/afixed at(b/a)_{2}and at m values ofb/awithkafixed at(ka)_... View full abstract»

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  • [Back cover]

    Publication Year: 1969, Page(s): c4
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    Freely Available from IEEE
  • Impedance of a monopole on the base of a large cone

    Publication Year: 1969, Page(s):703 - 706
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    This paper is concerned with the determination of the driving-point impedance of a monopole which is located at the center of the base of a perfectly conducting, right circular cone. The cone is assumed to be sufficiently large that it is valid to apply ray-optical theory. It is shown that the field which is reflected back to the monopole from the edge of the base may be pictured as arising from a... View full abstract»

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  • Transionospheric radio-ray-path rate of change from polarization and frequency measurements of satellite VHF signals

    Publication Year: 1969, Page(s):827 - 828
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The rate of change of the radio-ray-path length for transionospheric satellite signals is determined from Doppler and Faraday effect analyses for quiet ionospheric conditions. VHF beacon signals are used. The transionospheric path length of 40-MHz signals showed a natural oscillatory behavior of 1 wavelength per second. View full abstract»

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  • Characteristics of dielectric loaded and covered circular waveguide phased arrays

    Publication Year: 1969, Page(s):722 - 729
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    The use of dielectric materials for the hardening and matching of phased-array antennas in recent years has shown that a more complete understanding of the effects of these materials upon the array performance is necessary. The characteristics of fully loaded, plugged, and sheath covered circular waveguide phase arrays are analyzed and discussed. Numerical solutions of the boundary-value problem a... View full abstract»

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  • Case study of phase-center relationships in an asymmetric cassegrainian feed system

    Publication Year: 1969, Page(s):698 - 703
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    Determination of the phase center of the field scattered from the tilted hyperboloidal subreflector in an asymmetric Cassegrainian antenna system is carried out using several techniques. The caustic curves associated with the virtual reflected rays in the asymmetric system are determined from a differential-geometry analysis of the problem. A geometrical-optics analysis is carried out to determine... View full abstract»

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  • On VLF radiation fields along the static magnetic field from sources immersed in a magnetoplasma

    Publication Year: 1969, Page(s):824 - 827
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The focusing of waves from radiating VLF sources immersed in a cold magnetoplasma is investigated for the case in which the focusing takes place along the static magnetic field direction. The explicit form of tensor Green's function valid along the field line is derived for the far field, and the frequency ranges where focusing may be expected are specified. The theory is applied to calculate the ... View full abstract»

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  • Two-port isotropic radiator for unpolarized waves

    Publication Year: 1969, Page(s):809 - 810
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The possibility of radiating an equal amount of power in all directions and all polarizations, using a two-port antenna excited by two independent noise sources, is considered. View full abstract»

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  • Self and mutual admittances of rectangular-slot antennas in the presence of an inhomogeneous plasma layer

    Publication Year: 1969, Page(s):763 - 771
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    The self and mutual admittances for a pair of identical rectangular-slot antennas in an echelon configuration in the presence of an inhomogeneous plasma layer are derived using stationary expressions. Computations using the dominant TE01mode of the waveguide as a trial field are compared with experiments using a wide variety of configurations of space cloth to validate the computational... View full abstract»

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  • Radiation from an aperture in a conducting cylinder coated with a moving plasma sheath

    Publication Year: 1969, Page(s):757 - 762
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The electromagnetic radiation from an aperture on a conducting cylinder coated with a moving isotropic plasma sheath is considered. Numerical results are presented to illustrate the radiation patterns as functions of sheath velocity and plasma frequency for the circumferential slot and axial slot apertures. It is found for the circumferential slot aperture that the radiation is enhanced in the dir... View full abstract»

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  • Free current vibrations in wire antennas embedded in a moving medium

    Publication Year: 1969, Page(s):820 - 821
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The free current oscillations in a wire antenna are basic for the approximate representation of the driven antenna as a primary current source. It is shown here that this current distribution to be used as a primary source is altered by the motion of the surrounding medium. In contrast with conclusions elsewhere in literature, this result yields that the power radiation pattern of a center-driven ... View full abstract»

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  • A short cylindrical antenna as a diagnostic probe for measuring collision frequencies in a collision-dominated non-Maxwellian plasma

    Publication Year: 1969, Page(s):777 - 786
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    Investigations have been made to determine the effects of interparticle collisions on the antiresonant impedance characteristics of an electrically short, cylindrical antenna in the vicinity of the plasma frequency of an isotropic non-Maxwellian plasma (a weakly ionized plasma in which the electron-neutral collision frequency for momentum transfer is a function of the electron energy). The depende... View full abstract»

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  • Microwave scattering by a plasma covered sphere

    Publication Year: 1969, Page(s):823 - 824
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    Laboratory measurements of the scattering of microwaves by a plasma covered sphere are presented for forward scattering angles. The radial electron density variation is deduced from these data and a simple model of the experiment. View full abstract»

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  • Transient response of a dipole over a circular ground screen

    Publication Year: 1969, Page(s):806 - 809
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The time-domain response of a vertical electric dipole located over a circular ground screen is considered. The relevant time-harmonic solution is used as a starting point. By making a number of approximations a very simple formula is obtained for the transient response of the far field when the dipole current moment is a ramp function of time. It is shown that for early times, the pattern respons... View full abstract»

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  • Disk scattering at edge-on incidence

    Publication Year: 1969, Page(s):751 - 756
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    As part of a general study of the backscattering from thin plates illuminated by a plane wave at glancing incidence, measurements have been made of the surface and far fields of circular disks. Some results of the surface field probing are presented and interpreted in terms of optics and creeping wave components analogous to those appropriate to the surface of a cylinder. Analytic forms for the co... View full abstract»

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  • An interdigital-line radiator

    Publication Year: 1969, Page(s):796 - 797
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A brief discussion of an interdigital-line radiator is presented. The structure, initially called an interdigital array antenna, has its unique radiation characteristic at some proper frequency range. A broadside or an endfire radiation can be accomplished by rearranging the feed point of the structure. A fairly broad-band operation was observed. View full abstract»

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  • On energy conservation and the method of moments in scattering problems

    Publication Year: 1969, Page(s):747 - 751
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Electromagnetic scattering problems, including waveguide discontinuity, phased array, and scattering (exterior type) problems, are frequently described by integral equations that can be solved by the Ritz-Galerkin or generalized method of moments. Under appropriate conditions, it has been shown that reciprocity and variational properties are, in fact, preserved in the approximate solutions. It is ... View full abstract»

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  • Radiation from a monopole excited cone

    Publication Year: 1969, Page(s):707 - 715
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    This paper considers radiation from a finite, right circular, perfectly conducting cone which is excited by a quarter-wave monopole protruding from the center of its base. The cone is assumed to be of a size which places it above the resonance region, making a solution by the geometrical theory of diffraction possible. A formula which allows determination of the tip radiated ray from a semi-infini... View full abstract»

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  • Scale modeling of high-frequency antennas

    Publication Year: 1969, Page(s):810 - 811
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    First Page of the Article
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  • Theoretical study of a cylindrical antenna with a hemispherical cap

    Publication Year: 1969, Page(s):715 - 721
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The integral equation of a cylindrical monopole antenna with a hemispherical cap driven by a coaxial line is formulated and solved by two approximations. First, the current on the cap is approximated by a sinusoidal distribution. Secondly, the field across the driven gap is approximated by the fundamental transverse electromagnetic (TEM) coaxial-line mode. Results are compared with the tubular mod... View full abstract»

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  • First-order solutions for mutual coupling between waveguides which propagate two orthogonal modes

    Publication Year: 1969, Page(s):740 - 746
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    This paper describes a theoretical and experimental study of closely spaced open-ended waveguides radiating through a conducting ground plane. The waveguides are large enough in some cases to allew two orthogonally polarized propagating modes in each waveguide. A first-order analysis is presented which is based upon the method of moments and uses a single-mode approximation to the aperture field f... 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