By Topic

IEEE Transactions on Antennas and Propagation

Issue 6 • November 1978

Filter Results

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

    Publication Year: 1978, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (193 KB)
    Freely Available from IEEE
  • Comments on "Superconducting superdirectional antenna arrays

    Publication Year: 1978, Page(s): 891
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (115 KB)

    The author points out that the approximate results given for linear arrays in the above paper (see ibid., vol.25, p.885-7 (1977)) are somewhat misleading, and shows that the array factors at least can be written exactly View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back cover]

    Publication Year: 1978, Page(s): c4
    Request permission for commercial reuse | PDF file iconPDF (1971 KB)
    Freely Available from IEEE
  • A self-survey technique for self-cohering of antenna systems

    Publication Year: 1978, Page(s):877 - 881
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    A navigation technique is applied to the location of the elements of a flexible phased array. The technique also calibrates the phase reference for each array element. The system requires several beacons of known position. The effects on beamformation of beacon position errors and of phase measurement errors (owing to multipath) are predicted. The conclusions are confirmed by computer simulation a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Further comments on "Measured field of a directional antenna submerged in a lake"

    Publication Year: 1978, Page(s):872 - 873
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The author gives the reason for the major discrepancy in Fig.4 in the above paper (see ibid., vol.24, p.891-4 (1976)) between the numerical integration results and those based on Banos formulae View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The root-trajectory method--A tool for analyzing linear adaptive arrays

    Publication Year: 1978, Page(s):881 - 883
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A root-trajectory method is described that seeks to obviate the need for an extensive set of antenna patterns to describe the behavior of an adaptive array during its adaptation process. This aim is achieved by use of Schelkunoff's idea of describing a linear array in terms of an array polynomial. The roots of this polynomial have a direct interpretation in obtaining the array gain, and the trajec... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Temporal spectra of atmospheric amplitude scintillations at 110 GHz and 36 GHz

    Publication Year: 1978, Page(s):875 - 877
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Experimental results of the ratio of the atmospheric amplitude scintillation spectra at 110 GHz and 36 GHz and the amplitude coherences at these two frequencies are presented. Both results agree well with the theoretical predictions. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the possibility of "Real ray" tracing when the ray direction is complex

    Publication Year: 1978, Page(s):895 - 898
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    When the ray direction is complex, there exists no real trajectory along which the partial differential "equation of the eikonal" reduces to a system of ordinary differential (ray) equations. Such problems can be solved either by tracing complex rays or tracing a family of phase trajectories simultaneously. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Microwave delay characteristics of Cassegrainian antennas

    Publication Year: 1978, Page(s):860 - 865
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    An approach is presented in which the time an RF signal is delayed in propagating through a Cassegrainian antenna can be determined. The approach is based on the recognition that both the group delay (time) and the envelope delay (time) can be obtained from the antenna transfer function. Two antenna transfer functions are derived. The delay time under various antenna operating conditions is discus... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Digital error rate performance of active phased array satellite systems

    Publication Year: 1978, Page(s):833 - 842
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    A model for a multiple spot beam digital satellite employing an active phased array antenna with frequency reuse is proposed and applied to study the power limited down-link bit error rate performance. Since the power amplifier preceding each antenna element is generally nonlinear, intermodulation distortion is produced among the various spot beams, degrading performance. Expressions for the bit e... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Telescope surface measurement with two feeds

    Publication Year: 1978, Page(s):857 - 860
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A method is suggested where a reference feed is fixed at the telescope focus, and a second feed has a lateral offset and scans the focal plane. The telescope tracks a celestial radio source, and the receiver measures the phase difference at the two feeds and their (voltage) amplitude ratio. A set of coordinate transformations is applied, after which the surface deviations View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Bearing errors in the VHF omnirange due to scattering from wires

    Publication Year: 1978, Page(s):810 - 819
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    Scattering from obstacles in the vicinity of a VHF omnirange can cause bearing errors in aircraft receivers. A general formula is developed for the bearing error due to an arbitrary scatterer in terms of its scattering radiation pattern. The theory is then applied to get specific results for a long horizontal wire. The current distribution on the wire, the scattered field, and the bearing error ar... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rain-induced attenuation at 36 GHz and 110 GHz

    Publication Year: 1978, Page(s):873 - 875
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Results are presented of the ratios of the rainfall attenuation measured simultaneously along a common path at 36 GHz and 110 GHz. These ratios agree well with the theoretically derived ratios assuming the Laws-Parsons distribution. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Impedance of off-centered stripline fed series slot

    Publication Year: 1978, Page(s):893 - 895
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    Theoretical and experimental results on the variation of the impedance characteristics of displaced series slots in the ground plane of a stripline are presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of superdirective arrays with high radiation efficiency

    Publication Year: 1978, Page(s):819 - 823
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Superdirective arrays have been considered unrealizable due to the high elemental currents required and their sensitivity to small variations in amplitude and phase. A new approach to superdirective array design based on polynomials which optimize radiation efficiency has been devised. An example of the optimization procedure is given for a 2-wavelength 11-element array, and the sensitivities of r... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Active microwave sensing of the Earth's surface--A mini review

    Publication Year: 1978, Page(s):843 - 849
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    Radar has been used for remotely sensing the surface of the land and sea since the middle of World War II, but only since the mid-1960's has this technique become widely used for civil purposes. The nature of radar backscatter and theoretical models that have been used to describe it are briefly described. The state of knowledge of radar return from both land and sea is summarized. The principal r... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Bistatic clutter measurements

    Publication Year: 1978, Page(s):801 - 804
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Empirical data have been obtained from which estimates of the bistatic reflection coefficient \sigma _{0} have been determined. Measurements were made on two terrain types (grassy terrain and an area of tall weeds and rough ground) at low grazing bistatic angles of 70\deg , 75\deg , 80\deg , and View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Properties of the forward-scattered incoherent radiation through intense precipitation

    Publication Year: 1978, Page(s):804 - 809
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Incoherent radiation generally results from a first- or multiple-order scattering process; the first-order process is studied here with particular regard to its effects on large-capacity radio channels. It is shown, in fact, that the first-order scattering cannot be taken into account simply as noise because it generates fluctuations and nonlinearities of the channel transfer characteristic. In pa... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Range-testing a conical logarithmic spiral antenna for a dual-polarized riometer

    Publication Year: 1978, Page(s):870 - 872
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The off-axis axial ratios and the radiation patterns of conical log spiral models have been examined experimentally at a single frequency with the objective of finding a circularly polarized antenna of small physical height, suitable for use in decametric dual-polarized riometers. Truncation of a narrow-cone-angle spiral produced rapid axial-ratio degradation below View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Loaded horizontal antenna over an imperfect ground

    Publication Year: 1978, Page(s):789 - 796
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    The Fresnel reflection coefficient technique is employed to establish an E -field integral equation for the antenna current. A resistive loading of the form \Lambda (x) = \Lambda _{0}/(1 - |x|/L) is used to load the antenna. An optimization technique is discussed for determining the value of critical loading View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Broad-band VSWR measurements of a Cassegrain antenna

    Publication Year: 1978, Page(s):865 - 867
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Broadband VSWR measurements are reported on a small F -number Cassegrain antenna. Cyclical variations of VSWR between 1.00 and 1.25 with a 350-MHz frequency interval between unity VSWR values were observed over the 8.5-12.4 GHz frequency range. These variations correspond to a change in the power transmission ratio of 1.231 percent between the unity and 1.25 va... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multiple beam synthesis of low sidelobe patterns in lens fed arrays

    Publication Year: 1978, Page(s):883 - 886
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Low sidelobes in lens fed multibeam arrays present some unique problems. The technique of synthesizing low sidelobe patterns by the superposition of multiple orthogonal beams offers several advantages, particularly in lens fed arrays. It is shown that the Taylor line-source distribution is a superposition of multiple orthogonal beams. It is further shown that use of only three beams provides patte... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Scattering by an infinite periodic array of microstrip elements

    Publication Year: 1978, Page(s):850 - 854
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    An analysis of the scattering by an infinite periodic array of microstrip disks is made using a Galerkin solution of a vector integral equation. The solution is examined for convergence and compared with theory and experiment. The solution is used to minimize the loss and maximize the bandwidth of the element in a reflectarray configuration. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Partially adaptive array techniques

    Publication Year: 1978, Page(s):823 - 833
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    The selection of auxiliary elements for partially adaptive antenna arrays for the purpose of optimizing performance in a multiple narrow-band jammer environment is studied. An explicit solution for the two-jammer problem is derived. This case is sufficient to illustrate the interaction of multiple jammers and at the same time affords a degree of understanding of more complex problems. Computer sol... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Forward scattering from cylinders of triangular cross section

    Publication Year: 1978, Page(s):849 - 850
    Cited by:  Papers (14)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The induced-field ratios (IFR) of conducting cylinders of a triangular cross section have been calculated. When the width of the cross-section is in the range of 1-2 wavelengths, the E -wave IFR's are substantially less than the corresponding values for square or circular cross sections. From the standpoint of RF aperture blocking of a reflector antenna, the tr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief                                             Danilo Erricolo