By Topic

IEEE Transactions on Antennas and Propagation

Issue 2 • March 1983

Filter Results

Displaying Results 1 - 25 of 34
  • [Front cover and table of contents]

    Publication Year: 1983, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (204 KB)
    Freely Available from IEEE
  • Constrained optimization of monopulse circular aperture distribution in the presence of blockage

    Publication Year: 1983, Page(s):286 - 293
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (735 KB)

    A method of synthesizing aperture antenna excitations to obtain optimum performance in the presence of aperture blockage is presented. The problem of optimizing the performance indices such as directivity and angular sensitivity is formulated as anN-dimensional minimization problem, with constraint on the sidelobe level. In most cases, the objective function is nonlinear with multiple m... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Comments on "A unified and consistent view on the singularities of the electric dyadic Greeńs function in the source region"

    Publication Year: 1983, Page(s):346 - 347
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    Gives what the author considers to be the correct mathematical expression for Green's function. The original author then replies to this comment View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dyadic Green's functions for a coaxial line

    Publication Year: 1983, Page(s):355 - 358
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The eigenfunction expansions of the dyadic Green's functions for a coaxial line have been derived based on the method ofbarbar{G}_{m}, whereby the irrotational vector wave functionbar{L}is not needed. A dyadic boundary condition for the discontinuity of the tangential component ofbarbar{G}_{m}has been used to facilitate the derivation of the expression for the elec... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The wide-band matching area for a small antenna

    Publication Year: 1983, Page(s):364 - 367
    Cited by:  Papers (28)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    A special frequency scale is proposed for use in describing the fundamental limitation on wide-band matching of a small antenna by means of a fixed reactive network. This scale isu = - 1/omega^{3}, normalized to unit frequency (omega_{1} = 1)-It has unit width for the high-pass band above this frequency. In terms of the familiar matching exponentmu = ln 1/|rho|, th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Average dielectric properties of discrete random media using multiple scattering theory

    Publication Year: 1983, Page(s):371 - 375
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (466 KB)

    Using rigorous multiple scattering theory in determining the average or bulk dielectric properties of discrete random media is the objective of this communication. The random medium is modeled as a random distribution of identical, spherical scatterers imbedded in an homogeneous unbounded background medium. At high scatterer concentration, the form of the radial distribution function becomes impor... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spheroidal wave functions of large frequency parametersc = kfand the radiation fields of a metallic prolate spheroid excited by any circumferential slot

    Publication Year: 1983, Page(s):382 - 389
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (589 KB)

    Stratton, Chu, Flammer, and others have dealt with spheroidal wave functions and expanded them into series of Legendre or spherical Hankel functions for frequency parametersc = kfless than about ten, wherekis the wavenumber in free space andfis the focal length of the spheroid. However, whencis greater than ten, the series converges very slowly and even ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Digital image reconstruction of microwave holograms

    Publication Year: 1983, Page(s):389 - 394
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (599 KB)

    A system capable of recording the Fourier hologram of a reflecting target at various microwave frequencies is described. The assembly consists of a swept frequencyX-band interferometer circuit that illuminates a given target and a detector that scans a large square receiving area. The system is supervised by a microprocessor which controls the scanning operation, data acquisition, and s... View full abstract»

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

    Publication Year: 1983, Page(s): c4
    Request permission for commercial reuse | PDF file iconPDF (140 KB)
    Freely Available from IEEE
  • Cylindrical eigencurrents

    Publication Year: 1983, Page(s):325 - 333
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    The eigenvalue problem for the integro-differential operator associated with the electromagnetic scattering by conducting surfaces is solved for the case of long finite circular cylinders. The approach consists of reducing the eigenvalue equation to matrix form using the Galerkin technique, expanding the resulting matrix elements in an asymptotic series in inverse powers of the cylinder length, an... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Preliminary announcement of an 85 percent efficient reflector antenna

    Publication Year: 1983, Page(s):341 - 342
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    This communication is our preliminary announcement and claim for achievement of 85 percent aperture efficiency using a dual reflector antenna. We are aware of no other reflector antenna having such aperture efficiency, and we invite the antenna community to comment, critique, or inform us of equal or better claims. A full report will be forthcoming; this brief note will supply only pertinent highl... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reduction of bistatic scattering matrix measurements for inversely symmetric radar targets

    Publication Year: 1983, Page(s):237 - 242
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Experimental and/or theoretical evaluations of the bistatic scattering matrix can be greatly simplified if the radar target is known to possess inversion symmetry. The inversion symmetry relations between the elements of the matrix are introduced here based upon simple geometrical agruments. These relations are subsequently combined with the principle of electromagnetic reciprocity. The results ar... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The loop antenna with a cylindrical core: Theory and experiment

    Publication Year: 1983, Page(s):225 - 231
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    The electromagnetic field of an electrically small loop antenna with a cylindrical core is investigated. The infinitely long cylinder may be conducting or insulating. With the help of the principle of similitude, measurements made with a small loop at a high frequency with cylinders of water with widely different conductivities are applied to a very large loop around a mountain at a very low frequ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new minimum blocking condition including subreflector and quadrupod shadow for the design of dual reflector systems

    Publication Year: 1983, Page(s):342 - 346
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Earlier minimum blocking conditions (MBC's) for paraboloidal reflector antennas formulated by Hannan and Gillitzer did not take into acount the significant blocking contribution of the shadow of the legs supporting the feed or subreflector. A numerical-integration study to determine conditions under which the combined blocking shadow of the subreflector and its supports are minimized is described.... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Bandwidth of a low sidelobe level multimode radiating coupled waveguide array

    Publication Year: 1983, Page(s):280 - 285
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The multimode radiation patterns due to a waveguide periodically coupled on the one hand with another waveguide and, on the other hand, with unidentical radiating slots were studied. The aim of the study was to calculate and realize a prescribed current distribution which would obtain a low sidelobe level in a multimode array. First, the theoretical concept is justified after a successful comparis... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effect of substrate thickness on the performance of a circular-disk microstrip antenna

    Publication Year: 1983, Page(s):358 - 360
    Cited by:  Papers (34)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The effect of substrate thickness on the characteristics of a circular-disk microstrip antenna is examined. In the literature this effect has been dealt with theoretically, but experimental results explicitly showing the effect of substrate thickness on resonant frequency, input impedance, and bandwidth do not seem to be readily available. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Far field in transient two-dimensional scattering

    Publication Year: 1983, Page(s):367 - 369
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A heuristic definition of far field is given for time-domain two-dimensional scattering that simplifies the expression of the scattered far field as an integral over the sources. The meaning of this definition and of the ensuing simplifications is clarified by Fourier transforming the approximate time-domain result to compare it with well-known frequency-domain expressions in the Fresnel and Fraun... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of the performance of adaptive beam forming using perturbation sequences

    Publication Year: 1983, Page(s):268 - 279
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    Conventional adaptive antenna array processing employing gradient descent requires access to signals on all the antenna array elements. The processing can be carried out at the radio frequency stage, an intermediate frequency stage, and in some cases at baseband. In all cases coherence of the array element signals must be maintained. For situations where access to all the array channels is not pos... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The broad-band scattering response of periodic arrays

    Publication Year: 1983, Page(s):261 - 267
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    A technique for computing the broad-band scattering from periodic arrays of linear antennas is presented. This technique is based upon the expansion of the current distribution on each element in the array into a set of resonant modes. With the proper set of modes this technique is capable of interpreting the frequency response of many periodic arrays. This implies thai resonances can be attribute... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A GTD study of pyramidal horns for offset reflector antenna applications

    Publication Year: 1983, Page(s):305 - 309
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    An efficient computational method is demonstrated for determining the far-field patterns of reflectors illuminated by pyramidal horns. A uniform geometrical theory of diffraction (GTD) formulation is used to determine the near- and far-fields of the horn. The far-field patterns of the offset reflector are constructed using the physical optics (PO) formulation in conjunction with the Jacobi-Bessel ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Far-field radiation patterns of elliptical apertures and its annulli

    Publication Year: 1983, Page(s):360 - 364
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A Fourier transform technique is applied to derive expressions for the diffraction field due to elliptical apertures and its annulli. Perspective plots of the intensity distribution diagrams are generated for various values of the axis ratio with the help of an IBM-370/168 computer. All possible cases are discussed briefly. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A logarithmic reflection chart for presentation of antenna impedance

    Publication Year: 1983, Page(s):352 - 355
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A logarithmic chart is proposed to offer some advantages over the familiar hemisphere chart of Carter and Smith. On log-log coordinates, the scales are the voltage standing-wave ratio (VSWR), respectively, of impedance variation with zero angle and of angle variation with constant impedance. A locus of constant reflection or VSWR then has two equal diameters but departs from a circle by equal flat... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High-power VLF transmitter facility utilizing a balloon lofted antenna

    Publication Year: 1983, Page(s):243 - 248
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    A 100-kW transportable very low-frequency (TVLF) transmitter facility has been used for magnetospheric wave-injection experiments from sites in Alaska, New Zealand, and Norway. A unique feature of the TVLF facility is the antenna which is a conducting cable lofted to an altitude of 1500 m by a 1000-m3helium balloon. The antenna is driven at its base as a monopole above a ground plane. T... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rotational symmetries of electromagnetic radiation fields

    Publication Year: 1983, Page(s):377 - 382
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Maxwell's equations and their solutions have been examined from the point of view of the full rotation group. Two mapping theorems have been derived which give the rotational symmetries of the radiated electric and magnetic and Poynting's vector field as a function of the symmetries of the electric current density which acts as the radiating source. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of the loop-coupled log-periodic dipole array

    Publication Year: 1983, Page(s):253 - 260
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    A simple theoretical model is described to analyze the loop-coupled log-periodic dipole antenna (LPDA). Computed and experimental data are presented, comprising an investigation into both the far field and the dipole and feeder currents, for a wide range of antenna parameters. Particular attention is paid to a class of parasitic resonances characterized in the swept-frequency radiation pattern by ... 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