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Microwaves, Optics and Antennas, IEE Proceedings H

Issue 3 • Date April 1983

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Displaying Results 1 - 8 of 8
  • Conically depressed microstrip patch antenna

    Publication Year: 1983, Page(s):193 - 196
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (434 KB)

    A modified form of a microstrip circular patch antenna is presented by slightly depressing the patch configuration conically into the substrate. The theoretical analysis predicts the bandwidth of such an antenna to be much higher than that of an identical circular patch antenna with little change in the resonant frequency. The theoretical findings are supported by experimental observations. Theore... View full abstract»

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  • Improved radiation characteristics of conical horns with plastics-foam lenses

    Publication Year: 1983, Page(s):197 - 202
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (622 KB)

    The radiation characteristics of conical horns with plastics-foam lenses are studied. The use of a plastics-foam lens enables the aperture amplitude and phase to be controlled by changing the shape of the lens surface and the relative permittivity of the foam. Theoretical and experimental results for a conical-corrugated horn with double-refraction lens shows that uniform-transverse phase and ampl... View full abstract»

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  • Modes of resonance of the Jerusalem cross in frequency-selective surfaces

    Publication Year: 1983, Page(s):203 - 208
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (642 KB)

    Two frequency-selective surfaces consisting of arrays of Jerusalem crosses have been analysed using a modal technique. Calculated plane-wave-transmission coefficients are compared with experimental values in the frequency range 1¿40 GHz, for incidence up to 50° in the principal planes. At each reflection resonance the calculated element current distribution is illustrated and discussed. At the m... View full abstract»

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  • External modes of two-dimensional thin scatterers

    Publication Year: 1983, Page(s):209 - 214
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (562 KB)

    Two-dimensional wave scattering by open thin scatterers is studied. The current induced on the scatterer is expanded in modes, which are eigenfunctions of the singular part of the Green's function. The number of excited modes is a monotonic increasing function of the length of the scatterer and its curvature. An efficient numerical scheme for calculating the induced current emerges, with an explic... View full abstract»

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  • Microstrip linear array with polarisation control

    Publication Year: 1983, Page(s):215 - 224
    Cited by:  Papers (16)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1083 KB)

    A new configuration of microstrip series-fed linear array is presented; in which the choice of the specific array geometry permits selection of the dominant radiated polarisation from a wide range. The array consists of a series of right-angle bends in a microstrip line whose spacing determines the polarisation. Using an equivalent magnetic current analysis, closed-form expressions are derived for... View full abstract»

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  • Radiation from graded-index single-mode fibres

    Publication Year: 1983, Page(s):225 - 229
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (404 KB)

    Radiation from the fundamental mode due to sources in graded-index single-mode optical fibres can be examined by determining the effect of the presence of the perturbing core on the free-space (i.e. uniform cladding) radiation field. We look at this effect for fibres with power-law-profile cores. Using these examples we discuss the following two approximation schemes: (i) a new equivalent step app... View full abstract»

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  • Analysis of fin-line tapers and transitions

    Publication Year: 1983, Page(s):230 - 235
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (570 KB)

    A design method for tapered transitions between arbitrary types of fin line (unilateral, bilateral, antipodal fin lines and, as special case, rectangular waveguide) is presented which optimises the profile of the slot width itself. The procedure, which can easily be implemented on a desk-top computer, is based only on the knowledge of the propagation constant of the fundamental mode. Results are p... View full abstract»

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  • Temperature distribution in uniform and layered microwave absorbers in waveguide

    Publication Year: 1983, Page(s):236 - 243
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (927 KB)

    The temperature distribution in a waveguide microwave load, which is formed by layers of dielectric material, is evaluated in terms of the input power. The process involves solution of the electromagnetic and heat-flow equations for the layered structure, and computation using finite-difference methods. TE10, TE20 and TE11 modes are considered. The thermal boundary conditions treated are insulatin... View full abstract»

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