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IEE Proceedings H - Microwaves, Antennas and Propagation

Issue 6 • Date October 1985

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Displaying Results 1 - 11 of 11
  • Time-domain microwave target imaging

    Publication Year: 1985, Page(s):345 - 350
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (659 KB)

    The basic principle of time-domain imaging (i.e. the synthesis of the scattered electromagnetic field distribution over an object plane) is outlined. We have shown that from a set of responses obtained from different viewing directions, the two-dimensional field distribution can be synthesised using a technique similar to the computerised tomographic reconstruction. The limitations of the theory t... View full abstract»

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  • Dual-potential problems in transmission lines with limited or no symmetry

    Publication Year: 1985, Page(s):351 - 359
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1010 KB)

    Previous work in the development of dual finite-element methods applied to the solution of quasistatic problems has concentrated attention on transmission lines whose cross-section has well-defined dual symmetries. Many real problems of interest have either a single symmetry axis or no symmetry axis at all. It is the purpose of the paper to deal with these special cases with the stated aim of wide... View full abstract»

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  • Field and power-density calculations in closed microwave systems by three-dimensional finite differences

    Publication Year: 1985, Page(s):360 - 368
    Cited by:  Papers (17)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (964 KB)

    A three-dimensional finite-difference scheme is used to solve Maxwell's equations in closed microwave systems. The calculation of the sinusoidal steady-state amplitude and phase of the EM-field, and the derivation of the power density are discussed. The method is tested on some canonical examples which can be solved analytically. Finally, some nontrivial three-dimensional examples are given. View full abstract»

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  • Moment-method solution of the near-field distribution and far-field patterns of microstrip antennas

    Publication Year: 1985, Page(s):369 - 374
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (658 KB)

    Integral equations for both interior and exterior fields of microstrip antennas are formulated in terms of the tangential electric and magnetic field distributions over the conducting patch and dielectric substrate surfaces. Boundary conditions are applied, and a set of integral equations for the above surface distributions are obtained. Using a moment method, these integral equations are then red... View full abstract»

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  • TE-scattering from a conducting strip loaded by a dielectric cylinder

    Publication Year: 1985, Page(s):375 - 383
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (761 KB)

    The problem considered is that of determining the current induced on, and the field scattered by, a two-dimensional, flat, perfectly electrically conducting strip which is edge loaded by a dielectric cylinder of circular cross-section. The strip is oriented radially with respect to the centre of the cylinder and can be located outside, inside, or partially inside and partially outside the cylinder... View full abstract»

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  • Input impedance of a probe excited circular microstrip ring antenna

    Publication Year: 1985, Page(s):384 - 390
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (540 KB)

    The input impedance of a circular microstrip ring antenna excited by a coaxial probe is studied using cavity Green's-function technique. The model of an annular cavity with the boundary admittances at the edges is considered in the analysis. The boundary admittance is obtained by considering the radiated and reactive power flows through the apertures at the edges. Input impedance is formulated fro... View full abstract»

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  • Analysis of phase errors in antenna-measurements applications to phase-pattern corrections and phase-centre determination

    Publication Year: 1985, Page(s):391 - 394
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (454 KB)

    Some problems concerning phase measurements of antennas are described. Phase-measurement errors, due to the fact that the phase centre and the centre of rotation of the antenna under test do not coincide, are analysed. The results are used for application to phase-pattern correction and phase-centre evaluation. View full abstract»

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  • Equivalent-circuit models for frequency-selective surfaces at oblique angles of incidence

    Publication Year: 1985, Page(s):395 - 399
    Cited by:  Papers (30)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (494 KB)

    The equivalent-circuit-modelling technique is useful for designing printed frequency-selective surfaces. A correction term is derived which enables transmission responses to be modelled at oblique angles of incidence. Models derived for arrays of gridded-square and double-square elements are compared with experimental results for plane waves at normal incidence and at oblique angles for TE- and TM... View full abstract»

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  • Optimisation of contoured beams for satellite antennas

    Publication Year: 1985, Page(s):400 - 406
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (745 KB)

    One of the basic problems of realising an optimum contoured beam, together with sidelobe suppression, is the determination of the excitation coefficients for the individual horns of a reflector and horn-array geometry. The Fletcher-Powell and the Minimax methods of optimising an arbitrary coverage with sidelobe suppression have been studied. The paper presents the formulations applicable to the Fl... View full abstract»

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  • On the distribution of current on a straight wire antenna

    Publication Year: 1985, Page(s):407 - 410
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (402 KB)

    An iteration scheme, which converges to the unique solution of the integral equation for the current on a straight tubular antenna, is presented. View full abstract»

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  • Technical memorandum. Single-layer multiband frequency-selective surfaces

    Publication Year: 1985, Page(s):411 - 412
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (262 KB)

    Future multimission communications satellites will require a single reflector antenna to operate at three or more frequency bands. The paper describes the frequency responses of two single-layer frequency-selective surfaces suitable for this application, together with their crosspolar performance. These surfaces are alternatives to multilayer FSS currently being proposed and generally offer better... View full abstract»

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