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Journal ArticleDOI

Radar antenna with near-field cylindrical obstruction. Computer-program description

01 Feb 1971-Vol. 118, Iss: 2, pp 293-300
TL;DR: In this article, a technique for the calculation of the radiation patterns of radar antennas with single near-field cylindrical obstructions is described, and the computed and measured results are compared for a highly directional S band-radar antenna.
Abstract: A technique for the calculation of the radiation patterns of radar antennas with single near-field cylindrical obstructions is described. The computed and measured results are compared for a highly directional S band-radar antenna. Consideration is then given to the possible extensions of the method for cylinders of finite length and of noncircular cross-section, as well as for 3-dimensional radars.
Citations
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Journal ArticleDOI
TL;DR: In this article, a plane wave spectrum scattering analysis of the effects of a near-zone obstacle on the pattern performance of a directive antenna is discussed, and an efficient computer algorithm has been developed to compute the far-zone scattered and total fields for the antenna/cylinder system.
Abstract: A plane wave spectrum scattering analysis of the effects of a near-zone obstacle on the pattern performance of a directive antenna is discussed. The free-space azimuth monopulse antenna is characterized by its sum and difference mode plane wave spectra, and a computed plane wave scattering dyad is used to characterize the scattering by a metallic right circular cylinder when it is excited by the incident antenna spectra. An efficient computer algorithm has been developed to compute the far-zone scattered and total fields for the antenna/cylinder system. Extensive experimental data have been obtained, and the patterns calculated using the present analysis are in agreement with the measured data.

16 citations

Journal ArticleDOI
TL;DR: In this paper, an analytical model is presented which describes the farfield radiation pattern of an array antenna blocked by a vertical or horizontal metallic cylinder in the near field of the aperture, and the effects of the blockage are summarized graphically for a wide range of obstacle sizes and distances, and for aperture illuminations ranging from conventional reflector type distributions to ultralow sidelobe distributions.
Abstract: An analytical model is presented which describes the farfield radiation pattern of an array antenna blocked by a vertical or horizontal metallic cylinder in the near field of the aperture. The implementation of this model as a generalized computer program has been completed, and the computed radiation patterns have been verified by extensive measurements on a low sidelobe X -band slotted waveguide array. The effects of the blockage are summarized graphically for a wide range of obstacle sizes and distances, and for aperture illuminations ranging from conventional reflector-type distributions to ultralow sidelobe distributions. Using dielectric or absorptive coatings to improve the radiation pattern in the presence of cylindrical obstacles is proposed as a logical extension to the existing model.

4 citations

Journal ArticleDOI
TL;DR: In this paper, an analytically simple and numerically efficient technique for calculating the pattern distortion of aperture antennas radiating in the presence of conducting platforms located in the near or far field of the antenna is presented.
Abstract: An analytically simple and numerically efficient technique for calculating the pattern distortion of aperture antennas radiating in the presence of conducting platforms located in the near or far field of the antenna is presented. The technique presented, based on uniform geometrical theory of diffraction (UGTD), is also applicable for large aperture antennas (aperture area > 15 \lambda^{2} ). An excellent agreement between the calculated and measured results obtained for a typical aperture antenna mounted on a conducting platform confirms the validity of the analytical technique developed.

3 citations

Stephen Mack1
16 Jul 2012
TL;DR: A genetic algorithm optimization scheme for planning satellite earth station antenna layouts is presented and analyzed in this article, which allows for the optimal placement of large antennae within a bounded geographic area, making the best use of earth station land.
Abstract: A genetic algorithm optimization scheme for planning satellite earth station antenna layouts is presented and analyzed A method for quantifying the value of an antenna layout is described This scheme allows for the optimal placement of large antennae within a bounded geographic area, making the best use of earth station land Performance of the optimization scheme is illustrated by simulation results

3 citations


Cites background from "Radar antenna with near-field cylin..."

  • ...When we talk about a blockage of the satellite arc, we mean a physical object blocking the line of sight at a specific azimuth and elevation [12][13]....

    [...]

References
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Book
01 Jan 1959
TL;DR: In this paper, a review of basic work in the field and a comprehensive theoretical treatment of slots on cylindrical surfaces including circular cylinders, wedges, cylindrically-tipped wedges and elliptic cylinde are presented.
Abstract: A reprint of a book published 30 years ago by Pergamon and authored by a pioneer in the field gives a brief review of basic work in the field and a comprehensive theoretical treatment of slots on cylindrical surfaces including circular cylinders, wedges, cylindrically-tipped wedges, elliptic cylinde

269 citations

Journal ArticleDOI
TL;DR: In this article, an efficient computer subroutine for the generation of an array of Bessel functions of the first and second kinds for a given argument and all orders up to N has been written.
Abstract: An efficient computer subroutine for the generation of an array of Bessel functions of the first and second kinds for a given argument and all orders up to N has been written. It is faster, more accurate, and will work over a wider range of orders and arguments than the normally available IBM system/360 subroutines.

2 citations

Journal ArticleDOI
TL;DR: In this article, a method of computing the effect of a cylindrical obstacle in the near field of an aperture antenna is described, and the measured and calculated results for a typical case are then presented and other results discussed.
Abstract: A method of computing the effect of a cylindrical obstacle in the near field of an aperture antenna is described. The measured and calculated results for a typical case are then presented and other results discussed.

2 citations