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IEE Proceedings H - Microwaves, Antennas and Propagation

Issue 2 • April 1990

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Displaying Results 1 - 13 of 13
  • Footprint patterns obtained by planar arrays

    Publication Year: 1990, Page(s):108 - 112
    Cited by:  Papers (20)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (439 KB)

    An extension of Taylor's (1960) circular aperture pattern synthesis technique permits the generation of a flat-topped beam that is rotationally symmetric, surrounded by ring side lobes of controllable height, with the ripple amplitude also controllable. The corresponding continuous aperture distribution can be made pure real by appropriate root-pairing, which makes the results applicable, via samp... View full abstract»

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  • Diffraction over a flat-topped terrain obstacle

    Publication Year: 1990, Page(s):113 - 116
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (387 KB)

    A simple extension to the Fresnel-Kirchhoff theory of double knife-edge diffraction leads to expressions for the attenuation due to an obstacle with vertical sides and a flat, but not necessarily level, top. The method is to find the sum of the double knife-edge field and the field due to a wave that is reflected by the top of the obstacle as well as diffracted by the sides. It is assumed that the... View full abstract»

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  • Performance of an infinite array of monopoles in a grounded dielectric slab

    Publication Year: 1990, Page(s):117 - 120
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (367 KB)

    A full-wave solution is presented for the problem of an infinite array of vertical monopoles embedded in a grounded dielectric sheet. Calculated results are compared with experimental data from waveguide simulators for in /sub r/=1 (air) and in /sub r/=2.5 (acrylic) cases. Scan blindness is observed for the dielectric loaded case, and a grating lobe diagram augmented with surface wave circles is u... View full abstract»

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  • Behaviour of multiple elliptical waveguides opening into a ground plane

    Publication Year: 1990, Page(s):121 - 126
    Cited by:  Papers (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (576 KB)

    Radiation from elliptical waveguides terminating in a ground plane is analysed using a Green's function approach. In the waveguides the field is expressed as a sum of the TE/sub cmn/, TM/sub cmn/, TE/sub smn/ and TM/sub smn/ elliptical waveguide modes, and expressions for the mutual admittances of modes excited at the apertures are obtained. From these expressions the mode reflection and conversio... View full abstract»

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  • Generalised moment methods in electromagnetics

    Publication Year: 1990, Page(s):127 - 132
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (603 KB)

    An effort to unify three major numerical methods in electromagnetics is presented. Harrington's (1968) direct method of moments, the iterative methods, and the reaction integral equation method are shown to be generally equivalent and are unified as the generalised method of moments. It is shown that the reaction integral equation method is in general a moment method, and that the moment method, w... View full abstract»

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  • Edge condition of the field and AC resistance of a rectangular strip conductor

    Publication Year: 1990, Page(s):133 - 140
    Cited by:  Papers (23)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (606 KB)

    The AC resistance is an important factor in determining the insertion loss of miniature MMIC circuits over their passband. The metallisation of an MMIC is in the form of rectangular strips. The paper gives detailed formulation and analysis of the isolated rectangular strip conductor. Meixner's edge condition for the rectangular strip with loss is investigated. It is found that such a condition is ... View full abstract»

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  • Multistate instrument for characterising 2-ports

    Publication Year: 1990, Page(s):141 - 144
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (374 KB)

    A general method is reported for measurement of the complex reflection and transmission coefficients of a two-port device by connecting it between a reflectometer and a sequentially mismatched detector. The coefficients are determined from the ratios of outputs from two power sensors to that of a third, so that the method may be of use for adapting a scalar network analyser for measuring complex q... View full abstract»

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  • Computation of waveguide modes for waveguides of arbitrary cross-section

    Publication Year: 1990, Page(s):145 - 149
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (479 KB)

    Presents the use of the integral operator formulation approach to wave propagation in uniform hollow conducting waveguides of arbitrary cross-section. Cutoff wavenumbers, wall currents, and modal field distributions are obtained from the considered formulations using the method of moments. Waveguides with simply or multiply connected cross-sections and any shape of boundary including the septums c... View full abstract»

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  • Theoretical analysis of propagation characteristics of MSW in iron films

    Publication Year: 1990, Page(s):150 - 151
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (265 KB)

    The propagation characteristics of magnetostatic waves (MSW) in iron films are studied in detail. These films may be grown using MBE (molecular beam epitaxy), evaporation, sputtering or other methods. Calculated results show that by using very thin iron films the propagation losses due to conductivity of the iron film may be overcome, but the magnetic loss is rather high. A simplified method of ca... View full abstract»

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  • Application of optical ray technique to the design of short microwave horn antennas with low side lobe levels

    Publication Year: 1990, Page(s):81 - 88
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (745 KB)

    Optical ray theory is used to design a phase-corrected microwave horn antenna of short-length which produces a tapered aperture amplitude distribution in the E-plane. The basis of the design is the creation of a region where the effective refractive index varies with hyperbolic secant (HYSEC) form in a direction normal to the horn axis. In a practical realisation this effective refractive index di... View full abstract»

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  • New concept used to predict slant path rain attenuation statistics

    Publication Year: 1990, Page(s):89 - 93
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (425 KB)

    A new model for use in predicting rain attenuation from rain rate statistics has been developed based on the concept of moving rain cells with limited extension. Relevant CCIR information has been used for the necessary parameters. Results measured from 53 satellite paths were used to evaluate the prediction accuracy. The median value of the prediction error found to be +0.5 dB with a 1-sigma valu... View full abstract»

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  • Evaluation of the large array method

    Publication Year: 1990, Page(s):94 - 98
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (298 KB)

    Scan performance of infinite planar arrays can be approximated using Floquet excitations in a large but finite array. This method is evaluated for arrays of dipoles with and without a backscreen for comparison with exact unit cell results.<> View full abstract»

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  • Hybrid integral equation approach for patch antennas in multilayered substrates

    Publication Year: 1990, Page(s):99 - 107
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (780 KB)

    Presents an analytical technique for the calculation of the electromagnetic fields and surface currents associated to conducting patches of arbitrary shape embedded in a stratified medium. Surface waves arising in such structures are discussed in detail and approximate analytical formulas for their propagation constants are calculated. Two integral equation formulations are presented and their res... View full abstract»

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Aims & Scope

Published from 1985-1993, IEE Proceedings H contained significant and original contributions on microwaves, antenna engineering and radiowave propagation.

Full Aims & Scope