IEE Proceedings H - Microwaves, Antennas and Propagation

Issue 2 • April 1989

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Displaying Results 1 - 18 of 18
  • Broadband and robust adaptive antenna under correlation constraint

    Publication Year: 1989, Page(s):85 - 89
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (438 KB)

    The authors discuss a robust adaptive antenna which suppresses interference and provides protection of the broadband desired signal under the imperfect setting of directional constraint. The new guiding principle adopted to control the adaptive antenna is to minimise the output power under the constraint on the cross correlation between the desired signals at the input and output of the array. Acc... View full abstract»

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  • Directional constrained adaptive array using symmetric amplitude control

    Publication Year: 1989, Page(s):90 - 97
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (753 KB)

    A single directional constrained adaptive array using symmetric amplitude control is presented. The adaptive algorithm is based on the method of projection gradient. The steady-state and transient performances of the array are investigated. Detailed transient analysis for the case of one interference source is performed to get further insight. Results are compared with those obtained with conventi... View full abstract»

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  • Numerical analyses of printed line antennas

    Publication Year: 1989, Page(s):98 - 104
    Cited by:  Papers (15)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (560 KB)

    Square loop, meander dipole and spiral antennas printed on grounded dielectric substrates, are numerically analysed using Sommerfeld type integrals. The square loop is found to have a radiation pattern in which cross-polarisation is negligible and zero in the E-plane and the H-plane, respectively. The results obtained for the meander dipole demonstrate that such an antenna can be made small with n... View full abstract»

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  • Statistical stability of cumulative distributions of rainfall rate in the UK

    Publication Year: 1989, Page(s):105 - 109
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (399 KB)

    Rainfall rate data acquired from the UK Meteorological Office are analysed to investigate the statistical stability of cumulative distributions of rainfall rate. Information on the statistical stability of rainfall rate is useful for the design of reliable radio relay systems using frequencies above 10 GHz. By using the rainfall rate data measured at 10 typical locations which have nearly the same... View full abstract»

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  • Analysis of infinite arrays of probe-fed rectangular microstrip patches using a rigorous feed model

    Publication Year: 1989, Page(s):110 - 119
    Cited by:  Papers (44)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (788 KB)

    An analysis of infinite arrays of rectangular microstrip patches with each element fed by one or two coaxial probes is presented. The probe self-impedance and the rapidly varying patch current near the feed connection point are rigorously included in the analysis by using an attachment mode derived from the corresponding cavity model solution. Two-probe-fed patches are analysed for both reduced cr... View full abstract»

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  • Range estimation for SSL HFDF systems by means of a multiquasiparabolic ionospheric model

    Publication Year: 1989, Page(s):120 - 125
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (557 KB)

    The authors describe a computationally simple multiquasiparabolic (MQP) model which is largely defined in terms of standard scaled ionospheric parameters. The model gives analytic expressions for ground range estimation. Its results compare favourably with those obtained using numerical ray-tracing through a Dudeney ionosphere. In its present form the MQP model is suitable for use in operational s... View full abstract»

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  • Antenna beam steering technique using dielectric wedges

    Publication Year: 1989, Page(s):126 - 131
    Cited by:  Papers (5)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (583 KB)

    A technique is described for steering an antenna beam from boresight using a pair of dielectric wedges. The technique has been developed particularly for the application of a direct broadcast satellite television receive antenna, but would also be usable in other applications. A practical version has been designed and constructed, and the measured performance of this is compared with predictions.<... View full abstract»

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  • Magnetically coated horn for low sidelobes and low cross-polarisation (antennas)

    Publication Year: 1989, Page(s):132 - 138
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (520 KB)

    The authors show that low sidelobes, low cross-polarisation and, if desired, symmetrical radiation patterns, can be achieved for horn antennas by placing a properly designed magnetic coating on the inner walls of a horn. The magnetic coating over an electric conductor is, in effect, a simultaneously electric and magnetic conductor in these designs. By choosing appropriate horn flare angles, good a... View full abstract»

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  • Aperture field and circuit parameters of cavity-backed slot radiator

    Publication Year: 1989, Page(s):139 - 146
    Cited by:  Papers (21)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (677 KB)

    The general problem of a cavity-backed aperture radiator is formulated for the tangential electric field in the aperture. The result is used to obtain an integro-differential equation for the special case of a narrow slot backed by a rectangular cavity resonator. This equation is then solved numerically by the method of moments with the proper choice of piecewise sinusoidal basis and testing funct... View full abstract»

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  • New vectorial automatic technique for characterisation of resonators

    Publication Year: 1989, Page(s):147 - 150
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    A new vectorial technique, in the sense that data are complex magnitudes and are also treated as complex magnitudes, is presented for the complete characterisation of resonators. This technique is based on fitting the experimental data to the expressions relating them to the parameters which characterise the resonator. The authors have applied this technique to dielectric resonators coupled to a m... View full abstract»

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  • Space-harmonic analysis of multidepth corrugated waveguides

    Publication Year: 1989, Page(s):151 - 158
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (722 KB)

    Multidepth corrugated and ring-loaded waveguides are analysed in terms of space-harmonics. A general eigenvalue equation for the corrugated waveguide with M different slot depths in one corrugation period, is derived under the assumption of thin corrugations. The theory is then applied to corrugated waveguides possessing one to four different slot depths. Dispersion curves for tri-depth corrugated... View full abstract»

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  • Open resonator for microwave application

    Publication Year: 1989, Page(s):159 - 164
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (543 KB)

    The main properties of an open resonator powered by a metallic waveguide are investigated. The device is part of an experimental set-up aimed to produce a high electric field for particle accelerator schemes based on the two beat wave effect.<> View full abstract»

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  • Varactor tuned microstrip ring resonators

    Publication Year: 1989, Page(s):165 - 168
    Cited by:  Papers (3)  |  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (249 KB)

    Varactor tuned microstrip ring resonators have been developed with more than 30 percent tuning bandwidth using packaged hyperabrupt junction varactor diodes. The experimental tuning bandwidth was found to be in very close agreement with the predicted value obtained using analysis based on transmission line modelling. The attractiveness of the approach presented lies in its simplicity, the tuned re... View full abstract»

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  • Simple primary focus feeds for deep reflectors

    Publication Year: 1989, Page(s):169 - 171
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (309 KB)

    The radiation characteristics of the coaxial cavity feed antenna are computed numerically. Excellent agreement between the computed and measured radiation patterns is obtained. The numerical method is used to optimise the performance of the antenna as a feed for deep parabolic reflectors (f/D<0.35). The cross-polarisation level is reduced from -16 dB to below -30 dB. The circular waveguide is fill... View full abstract»

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  • Capacitive matching of microstrip patch antennas

    Publication Year: 1989, Page(s):172 - 174
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (244 KB)

    The input impedance of a thick microstrip patch antenna is inherently inductive. The patch can be matched by using a capacitive annular gap round the feed point. By varying the amount of capacitance the input resistance is also varied. It is shown that input resistances in the range 40 to 120 ohms can be chosen by varying the radius of the annulus. A return loss of -20 dB over a bandwidth of 13% w... View full abstract»

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  • Refractive multipath ray tracing model

    Publication Year: 1989, Page(s):175 - 178
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (285 KB)

    A ray tracing technique for refractive multipath on line of sight (LOS) microwave links is presented. This technique combines both analytical and computer approaches to simplify the analysis and reduce the computational time. It utilises the flattened-Earth transformation to account for the Earth's curvature. The associated modified refractivity profile is represented by a new and versatile smooth... View full abstract»

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  • Analysis of curtain arrays for HF broadcasting

    Publication Year: 1989, Page(s):179 - 181
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (282 KB)

    A method of analysing HF dipole curtain arrays is presented which uses a circuit model to compute the currents fed to the dipole elements. A standard moment-method analysis is carried out once to establish the short-circuit admittance matrix for the set of dipoles. Subsequently the circuit-model analysis can be used to compute the performance of the array with alternative feeder configurations ver... View full abstract»

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  • Computer design of microwave IC transistor amplifiers

    Publication Year: 1989, Page(s):182 - 184
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (252 KB)

    A computer program which adds nodes and components to circuits is used to design microwave amplifiers. Transistors are represented by their experimental s-parameters. Simple amplifiers which are produced from the simplest of starting circuits have a very good theoretical performance over a wide bandwidth.<> 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