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IEE Proceedings H - Microwaves, Antennas and Propagation

Issue 3 • Jun 1989

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Displaying Results 1 - 17 of 17
  • Scattering by a perfectly conducting strip loaded with a dielectric cylinder (TM case)

    Publication Year: 1989, Page(s):185 - 190
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    A rigorous analysis of the problem of scattering from an incident E-polarised wave on a dielectric-loaded perfectly conducting strip is presented for a line source and plane wave excitations. The vector Green's theorem is used to derive an integral equation for the unknown electric and magnetic field components. The singular component of the magnetic field is then cancelled out by properly choosin... View full abstract»

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  • Electromagnetic diffraction by two perfectly conducting wedges with dented edges loaded with a dielectric cylinder

    Publication Year: 1989, Page(s):225 - 234
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (676 KB)

    A rigorous field analysis of the problem of two identical perfectly conducting parallel wedges with dented edges loaded with a dielectric cylinder, and excited by an electric or magnetic line current in the upper sector, is given. The dielectric medium is assumed to be linear, homogeneous, isotropic and free from losses, whereas the mediums of the upper and lower sectors are free space. A field eq... View full abstract»

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  • Analysis of asymmetric TEM cell and its optimum design of electric field distribution

    Publication Year: 1989, Page(s):191 - 194
    Cited by:  Papers (3)  |  Patents (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (362 KB)

    By using the Green's function/variational formulation with a new form of charge distribution expressions for the characteristic impedance and electric (E-) field are obtained for an asymmetric TEM cell. The main details of a series of computer programs to implement an optimum design of the E-field distribution are presented.<> View full abstract»

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  • Propagation and radiation from partly filled elliptical waveguide

    Publication Year: 1989, Page(s):195 - 201
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (603 KB)

    The propagation and radiation behaviour from a partly filled (with dielectric) elliptical waveguide is considered. From an approximate analysis the author investigates the potential of such a waveguide for radiating a pure circularly polarised shaped beam. He also establishes a quantitative measure of the deterioration in linear cross polarisation performance of a balanced hybrid mode with loss of... View full abstract»

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  • Near-field measurements on plane-polar facility

    Publication Year: 1989, Page(s):202 - 208
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (755 KB)

    The authors describe far-field predictions obtained on a plane-polar facility. The procedure for the transformation of the near-field to the far-field uses a fast algorithm for the calculation of the radiation integral and is presented in the form of a cross correlation which is carried out using the fast Fourier transform. Predictions of the far-field patterns of two antennas are shown. A numeric... View full abstract»

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  • EM wave scattering from statistically inhomogeneous and periodic random rough surfaces

    Publication Year: 1989, Page(s):209 - 214
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (646 KB)

    First-order scatter from statistically inhomogeneous and periodic random rough surfaces is treated by the boundary perturbation technique. The single array of rough strips on a perfectly conducting plane and the complementary arrays of rough strips are examined. Using a sampling approach, it is proved that scatter is produced through a multiple Bragg resonance mechanism. The scattering behaviour o... View full abstract»

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  • Design of E-plane filters made easy

    Publication Year: 1989, Page(s):215 - 218
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (313 KB)

    Simple and effective models for the equivalent circuit parameters of waveguide E-plane metal septum are presented. It makes the design of E-plane bandpass filters very easy. The computer-predicted frequency responses were found to be in good agreement with the measurements.<> View full abstract»

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  • Matching using double slug transformer and correction to transistor gain

    Publication Year: 1989, Page(s):219 - 224
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (508 KB)

    Matching using a coaxial double slug transformer, particularly in relation to measurements on microwave transistors at 0.5-2 GHz, is described. The limits arising from tuner loss and the correction to transistor gain which needs to be applied are determined analytically. The correction is compared with that deduced from reflection measurements, good agreement being obtained. The use of parallel pl... View full abstract»

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  • Aperture impedance of flared horns

    Publication Year: 1989, Page(s):235 - 240
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (445 KB)

    The method of moments is often used when solving for the mutual coupling in arrays of aperture antennas. For elements that are waveguides or gradually flared horns, the aperture fields can be approximated by a finite sum of waveguide modal functions. To solve for the flared horn case, an approximation for the aperture impedances of the modes in the horn is needed. The WKB approach can be used to f... View full abstract»

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  • Reflection coefficient at the feed of a radome-covered reflector antenna: a geometrical optics approach

    Publication Year: 1989, Page(s):241 - 244
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    A previously derived asymptotic expression for the reflection coefficient at the feed of a paraboloidal reflector antenna covered with a paraboloidal radome is shown to be valid, with suitable modifications, for general reflector radome configurations. This generalisation is illustrated through the particular choice of a paraboloidal reflector covered with a spherical radome. The generalised asymp... View full abstract»

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  • Generalised Villeneuve n distribution (antenna theory)

    Publication Year: 1989, Page(s):245 - 249
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (390 KB)

    A generalised Villeneuve type linear array distribution is developed, which permits the direct synthesis of discrete array distributions for high efficiency sum patterns of arbitrary sidelobe level and envelope taper. With the Dolph-Chebyshev distribution as the parent space factor, and the correct perturbation of these space factor zeros, the excitation efficiency and beamwidths are kept as close... View full abstract»

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  • Intrinsic mode theory of conical corrugated horns

    Publication Year: 1989, Page(s):250 - 256
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (617 KB)

    The application of the concept of intrinsic modes to the theory of propagation in conical corrugated horns is developed. An intrinsic mode is an exact solution of source-free Maxwell equations which satisfies the boundary conditions to a prescribed order of accuracy as the flare angle alpha becomes small. There exists an infinite number of intrinsic modes for a given structure and each one corresp... View full abstract»

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  • Edge mode effect in the operations of waveguide twin-slab ferrite phase shifter

    Publication Year: 1989, Page(s):257 - 260
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (367 KB)

    The distributions of the electric and magnetic fields and power of the classic rectangular waveguide twin-slab ferrite phase shifter, with one region magnetised along the positive y-direction and the other along the negative y-direction, are re-examined. The author indicates that this type of device may quite often be phenomenologically described by a nonreciprocal edge-mode effect, rather than, a... View full abstract»

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  • Analysis of circular microstrip antennas with superstrate

    Publication Year: 1989, Page(s):261 - 262
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    The spectral domain analysis is applied to study the effects of dielectric cover on a circular microstrip patch antenna. Numerical examples indicate that the resonant frequency of the patch is decreased considerably while the bandwidth is varied slightly.<> View full abstract»

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  • Theoretical and experimental investigations of two-dimensional waveguide-excited short backfire antenna structure

    Publication Year: 1989, Page(s):263 - 268
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (400 KB)

    The method of moments is utilised to investigate the radiation characteristics of the two-dimensional version of a short backfire antenna excited by an input TEM mode. The theoretical predictions of the far field patterns and the input VSWR are in very good agreement with measurements performed on an actual prototype designed for the X-band. The technique has the virtue that it can be readily appl... View full abstract»

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  • Uniqueness of numerical solutions to electric-, magnetic- and combined-field integral equations for open-ended circular waveguides

    Publication Year: 1989, Page(s):269 - 275
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (604 KB)

    The moment method is used to solve the electric-, magnetic- and combined-field integral equation to determine the current distribution on a semi-infinite, open-ended, circular waveguide. A standard triangle-function expansion is used to represent the exterior waveguide wall currents. The approximate nature of this current distribution is shown to lead to difficulties with the uniqueness of both th... View full abstract»

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  • Lens antennas with amplitude shaping or sine condition

    Publication Year: 1989, Page(s):276 - 279
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    The authors demonstrate the method of generic curve series to obtain the profiles of dielectric antennas, with design conditions either for the specification of the aperture-amplitude distribution from a given source distribution, or for agreement with the Abbe sine condition. The method has already proved successful in the design of dual reflector antennas, and the extension to refractive media i... View full abstract»

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