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IEE Proceedings H - Microwaves, Antennas and Propagation

Issue 1 • Date February 1985

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Displaying Results 1 - 14 of 14
  • Rigorous field theory analysis of quasiplanar waveguides

    Publication Year: 1985, Page(s):1 - 6
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (525 KB)

    An accurate field theory solution for calculating the hybrid eigenmodes of quasiplanar structures is introduced which includes both the influence of the finite strip thickness and waveguide housing grooves. Using the transverse resonance method the size of the characteristic matrix equation is kept constant even for an increasing number of discontinuities. Dispersion characteristics of various str... View full abstract»

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  • Finite-element analysis of the shielded cylindrical dielectric resonator

    Publication Year: 1985
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (902 KB)

    Results are presented of the application of the finite-element method to evaluate the resonant frequency and external Q-factor Qe of a cylindrical dielectric resonator operating in the TE01¿¿-mode, taking into account the effects of the conducting shield and the supporting substrate. Normalised design charts covering a wide range of practical geometrical and physical parameters are presented. Meas... View full abstract»

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  • Noise parameters of embedded noisy two-port networks

    Publication Year: 1985, Page(s):17 - 22
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (539 KB)

    Embedding networks such as bias or feedback elements etc. modify the noise performance of a twoport. This influence is investigated for both lumped and distributed embedding networks and formulas are derived for noise parameters of the embedded network. View full abstract»

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  • Phase constant characteristics of generalised asymmetric three-coupled microstrip lines

    Publication Year: 1985, Page(s):23 - 26
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    Phase constant characteristics of generalised asymmetric three-coupled microstrip lines are presented and discussed. The influence of various structural parameters, as well as the effects of dispersion, are incorporated to show the behaviour of three fundamental guided modes. View full abstract»

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  • Permittivity measurements using a frequency-tuned microwave TE01 cavity resonator

    Publication Year: 1985, Page(s):27 - 32
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (797 KB)

    A measuring system for determining the complex permittivity of low-loss solids using a frequencytuned TE01 cavity resonator of fixed length is described. Its mechanical construction is simple, and measurements, in particular of the real part ¿¿' of the permittivity, can be performed within a relatively short measuring time with high precision ($$$¿¿¿¿'/¿¿'|< 7 ¿¿ 10¿¿4), for a large number of f... View full abstract»

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  • Exact ray path calculations in a modified Bradley/Dudeney model ionosphere

    Publication Year: 1985, Page(s):33 - 38
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (571 KB)

    Bradley and Dudeney's model of the vertical distribution of the ionospheric electron concentration consists of three distinct sections. Both the E-region and F2-region are described by parabolic variations. A linear increase is assumed to exist between the E-region peak and the F2-region. This model is currently recommended by the International Radio Consultative Committee (CCIR) for use in long-t... View full abstract»

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  • Model of rainfall-rate distribution for radio system design

    Publication Year: 1985, Page(s):39 - 43
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (407 KB)

    Owing to the interest raised by the precipitation effects in the design of satellite and terrestrial microwave radiolinks, it is necessary to have a simple and valuable mathematical model which can represent, with good accuracy, the whole rain-rate distribution, from lowest rain-rate values to the tail of this distribution. Previously the author suggested a two-parameter model which adequately rep... View full abstract»

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  • Generalised array pattern synthesis using the projection matrix

    Publication Year: 1985, Page(s):44 - 46
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (393 KB)

    An analytic solution to the problem of array pattern synthesis having null and norm constraints is given. We show that the required complex weight vector can be obtained by finding the eigenvector corresponding to the maximum eigenvalue of a Hermitian matrix. The generality of the method is illustrated by applying it to synthesise patterns with multiple look directions. View full abstract»

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  • General design of two-reflector antennas

    Publication Year: 1985, Page(s):47 - 52
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (494 KB)

    A new description of the profiles of the main reflector and subreflector of a dual-reflector antenna is given in terms of a single parameter, the angle subtended by the normal to the main reflector and the axis of the system. It is shown that the same parameter describes the nature of the focusing in both the illuminating beam and the image space. Hence, quite general illumination, focusing and ma... View full abstract»

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  • Decomposition of antenna signals into plane waves

    Publication Year: 1985, Page(s):53 - 57
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (762 KB)

    A modification of Prony' method, in which an attempt is made to constrain the roots of the polynomial to the unit circle, is used to resolve a number of plane waves illuminating a uniformly spaced line array. A least squares method based on the eigenstructure of a certain correlation matrix is developed to handle the overdetermined case when there are excess numbers of antenna elements. Angle esti... View full abstract»

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  • Book review: Microwave Imaging with Large Antenna Arrays

    Publication Year: 1985
    IEEE is not the copyright holder of this material | PDF file iconPDF (181 KB)
    Freely Available from IEEE
  • General method for the computation of radiation in stratified media

    Publication Year: 1985, Page(s):58 - 62
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (591 KB)

    A general universal computational method for the general electromagnetic problem in stratified media is established. Computations are successfully performed for the field of a horizontal magnetic dipole in a microwave substrate backed by a conducting plane. The general field problem in stratified media is expressed in the form of integrals over kp. The integrands involve Bessel functions which are... View full abstract»

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  • Optimising the synthesis of shaped beam antenna patterns

    Publication Year: 1985, Page(s):63 - 68
    Cited by:  Papers (69)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (789 KB)

    A technique is introduced which uses the conventional polynomial representation of the antenna pattern produced by an equispaced linear array. Certain roots are displaced from the unit circle radially, to fill a portion of the pattern, which before this displayed lobes interspersed by deep nulls. The angular and radial positions of all the roots are simultaneously adjusted so that the amplitude of... View full abstract»

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  • Technical memorandum. Fast, accurate computational method for asymmetric coupled microstrip parameters

    Publication Year: 1985, Page(s):69 - 70
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (267 KB)

    An accurate and direct method is introduced for determining the design parameters of asymmetric coupled microstrip lines for any substrate material, in terms of known design parameters for any other substrate material. To check the accuracy of the method two examples are given. In the first example a quartz substrate is considered, while in the second example a teflon substrate is considered. In b... View full abstract»

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