IEEE Transactions on Antennas and Propagation

Issue 2 • March 1972

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  • [Front cover and table of contents]

    Publication Year: 1972, Page(s): 0
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    Freely Available from IEEE
  • G-AP best paper award for 1970

    Publication Year: 1972, Page(s): 121
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    Freely Available from IEEE
  • A modal analysis of the dielectric rod antenna excited by the HE11mode

    Publication Year: 1972, Page(s):122 - 128
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (690 KB)

    A hybrid modal solution is developed for the circular semi-infinite dielectric rod antenna excited in theHE_{11}hybrid mode. Numerical results for the near-zone and far-zone fields, as well as the gain, beamwidth, and percentage of power radiated, are determined for three rods of different diameter and dielectric constant by enclosing the rods with a concentric metal pipe and allowing t... View full abstract»

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  • Gain measurements of standard electromagnetic horns in the K and Kabands

    Publication Year: 1972, Page(s):136 - 142
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (745 KB)

    Measurements are described in which the gains of standardhorns in theKandK_{a}bands were determined at a number of wavelengths. The two-antenna method was used. It is believed, after a detailed error analysis, that the gain is known within a limiting error of about 0.05 dB at each wavelength measured. A method is described for measuring the ohmic losses in the horn, So that t... View full abstract»

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  • On the Taylor distribution

    Publication Year: 1972, Page(s):143 - 145
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (273 KB)

    The original Taylor distribution was designed to terminate abruptly in a pedestal (alpha = 0) at its edges. It has been found recently, however, that a pedestal cannot be realized exactly in either theEorHplanes, nor even approximately in theHplane. A new distribution is derived here that produces a Taylor pattern of orderalpha = 1and, hence, ... View full abstract»

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  • Interferometric measurement at 1415 MHz of radiation pattern of paraboloidal antenna at Dwingeloo radio observatory

    Publication Year: 1972, Page(s):166 - 176
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1163 KB)

    The complete radiation pattern of a 25-m diameter radio telescope has been measured at 21-cm wavelength to a level of 60 dB below the main beam response. Strong cosmic radio sources with known flux density were used as a signal source. The measurement employed an interferometer consisting of the radio telescope and a 7.5-m diameter reference antenna. By changing the orientation of the telescope, w... View full abstract»

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  • High resolution measurement of microwave refraction on short tropospheric paths

    Publication Year: 1972, Page(s):176 - 181
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    A method of measuring angle of arrival, or angle of fire, of a microwave signal transmitted over a short line-of-sight path is described. The method used is similar to that employed in conical scan, or simultaneous lobing, radars. Accuracy in angular measurement is achieved by utilizing the portion of the antenna pattern in which the gain function varies rapidly with angle. Using 4-ft aperture ant... View full abstract»

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  • Rain attenuation at 15 and 35 GHz

    Publication Year: 1972, Page(s):181 - 187
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (667 KB)

    In order to satisfy future earth-to-space communications needs, new regions of the electromagnetic spectrum must be exploited. A program to determine the feasibility of using millimeter waves for this application has been conducted at Air Force Cambridge Research Laboratories (AFCRL) for approximately 6 years and it has been shown that at frequencies of 15 GHz (lambda = 2.0cm) and 35 GH... View full abstract»

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  • Effect of ground plane absorption coefficient on the admittance of a slot antenna radiating into a warm lossy plasma

    Publication Year: 1972, Page(s):208 - 210
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (241 KB)

    The effects of the ground plane electron absorption coefficient on the admittance of a half-wavelength slot antenna radiating into a warm lossy plasma are examined for a range of plasma conditions and slot widths. The ground plane absorption coefficient is observed to have significant effects on the admittance of a thin slot when the plasma is greatly overdense, even when the plasma is only mildly... View full abstract»

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  • Measured surface spectrum dependence of backscattering from rough surface

    Publication Year: 1972, Page(s):211 - 214
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The wavelength dependence of backscatter from a smoothly undulating randomly rough surface was measured over a broad continuous range of wavelengths using acoustic waves in water. The experiment resulted in discovering a transition region in which the wavelength dependence changed abruptly fromlambda^{0}tolambda^{+3}, apparently due to change in the surface height spectrum. T... View full abstract»

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  • Comments on "Phase properties of backscattered fields from thin rods"

    Publication Year: 1972, Page(s): 223
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1972, Page(s): c4
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    Freely Available from IEEE
  • Dielectric-loaded horn antenna

    Publication Year: 1972, Page(s):199 - 201
    Cited by:  Papers (18)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    A wide-band dual-mode horn, which has a rotationally symmetric beam and extremely low sidelobe levels, can be obtained by loading a dielectric band inside the horn antenna. Measured radiation characteristics of such antennas, including the so-called shaped-beam antenna, are shown. View full abstract»

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  • Conical-reflector antennas

    Publication Year: 1972, Page(s):146 - 152
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    The mechanical advantages of a singly curved conical reflector are demonstrated by the experimental test of a furlable 1.83 m conical-Gregorian antenna at 16.33 GHz. The measured gain of 47.5 dB corresponds to a net efficiency of over 57 percent. A ray-optics analysis of conical-reflector antennas is presented, and data useful in the design of conical antennas is given. The conical-Gregorian anten... View full abstract»

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  • Scattering of waves with normal amplitude distribution from cylinders

    Publication Year: 1972, Page(s):216 - 217
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The scattering of waves with a Gaussian amplitude distribution from perfectly conducting and radially inhomogeneous dielectric cylinders is presented. The plane wave scattering solution is obtained as the limiting case when the radius of the scatterer is much smaller than the size of the wave. The scattering of beam waves from spherically symmetric particles was considered recently by Morita et al... View full abstract»

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  • Uncoupled cylindrical wave modes for a radially inhomogeneous medium

    Publication Year: 1972, Page(s):217 - 219
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The equations for the transformation of the tangential electric and magnetic fields through a series of uniform cylindrical layers of arbitrary properties are transformed from their generally coupled form to an uncoupled set of two equations. The complexity of the transformation matrices is thereby greatly reduced. The decoupling operation amounts to a coordinate transformation which has a direct ... View full abstract»

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  • The effect of the thin-wire approximation and the source gap model on the high-frequency integral equation solution of radiating antennas

    Publication Year: 1972, Page(s):210 - 211
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The effect of using the thin-wire approximation in the integral equation solution of radiating antennas is discussed in this communication. In addition, the effect of having a source region which varies with the number of matching points used for solving the integral equation is considered. It is found that these effects can cause large errors in the solution at high frequencies and may cause appr... View full abstract»

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  • The peak sidelobe of the phased array having randomly located elements

    Publication Year: 1972, Page(s):129 - 136
    Cited by:  Papers (72)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    A formula is derived for the peak sidelobe level of a phased array in which the elements are randomly located. The parameters of the formula are the number and size of the array elements, size of the array, wavelength, beamsteering angle, and signal bandwidth. The theory is tested by measurement of the peak sidelobe of several hundred computer-simulated random arrays. Unlike the case for the conve... View full abstract»

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  • Statistical performance of a magnetic energy-density antenna

    Publication Year: 1972, Page(s):221 - 223
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    In mobile communication a three-element energy-density antenna responding to the total electromagnetic energy density offers a way for combatting fading in a standing-wave environment caused by multiple reflections from surrounding objects. Statistical analyses show that in certain respects the performance of a magnetic energy-density antenna consisting of two crossed slots can be expected to comp... View full abstract»

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  • Plane wave pulse backscattering from a low-density dielectric sphere

    Publication Year: 1972, Page(s):214 - 216
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The solution to the scattering problem of a pulse incident on a low-density dielectric sphere is presented. Pulse modulated harmonic carriers and dc pulses are considered. View full abstract»

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  • The effects of a moving anisotropic grounded layer on radiation from a line source

    Publication Year: 1972, Page(s):224 - 226
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The radiation from a magnetic or an electric current line source embedded in an uniaxially anisotropic grounded dielectric or plasma layer moving perpendicular to the line source is described. The radiation pattern is obtained, and the effects of the motion of the layer on the radiated power distribution are examined with several numerical examples. View full abstract»

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  • Surface waves and anomalous wave radiation nulls on phased arrays of TEM waveguides with fences

    Publication Year: 1972, Page(s):160 - 166
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    This paper describes the behavior of an infinite array of parallel plane waveguides in a conducting ground plane with metallic fences perpendicular to the ground plane and spaced halfway between each pair of radiators. The study is mainly concerned with anomalous wave nulls and their relation to endfire surface-wave radiation, and in addition some data is presented to demonstrate the scan matching... View full abstract»

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  • An experimental study of a balun-fed open-sleeve dipole in front of a metallic reflector

    Publication Year: 1972, Page(s):201 - 204
    Cited by:  Papers (39)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The characteristics of a balun-fed open-sleeve dipole mounted in front of a metallic reflector for operation in the 225 to 409 MHz band are investigated. A parametric study is made of the VSWR response as a function of dipole and sleeve diameter, sleeve length, and sleeve-to-dipole spacing. It is shown that an open-sleeve dipole can be operated over a bandwidth of 1.8:1 as compared with an operati... View full abstract»

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  • Solution near the wavefront of transient fields in inhomogeneous dispersive media

    Publication Year: 1972, Page(s):219 - 221
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Uniform asymptotic representations, valid in the vicinity of the wavefront, are derived for transient fields propagating in an inhomogeneous dispersive medium. When the space-time ray equations for these fields can be solved explicitly, the uniform representations yield explicit expressions in the space-time variables; otherwise, the representations involve a parameter which can, however, be elimi... View full abstract»

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  • Waveguide excited dielectric spheres as feeds

    Publication Year: 1972, Page(s):206 - 208
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The results of experiments with dielectric obstacles of various geometries placed directly upon the apertures of circular and rectangular waveguides are presented. It is found that dielectric spheres, and in some instances dielectric cubes, two to four wavelengths in dimension produce directive patterns with low sidelobe levels. For some cross sections, the measured gain of these antennas is great... 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                                             Danilo Erricolo