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IEE Proceedings H - Microwaves, Antennas and Propagation

Issue 2 • Date April 1988

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Displaying Results 1 - 16 of 16
  • Analysis of suspended microstrip taper baluns

    Publication Year: 1988, Page(s):65 - 69
    Cited by:  Papers (9)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (354 KB)

    Presents exhibits and events of the 2015 Mobile World Congress. View full abstract»

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  • Analysis of harmonic injection frequency dividers with three-terminals devices

    Publication Year: 1988, Page(s):70 - 74
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (368 KB)

    This paper presents a method for analysing harmonic injection frequency dividers, one that can be used to determine the locking range with any injection power. The method is proved, with an example in which an analysis is made of a divider by three constructed with a GaAs MESFET. Certain conclusions on design are also included.<> View full abstract»

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  • Multiple dielectric loaded perforated screens as frequency selective surfaces

    Publication Year: 1988, Page(s):75 - 82
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (761 KB)

    Perforated screens can be used as frequency selective surfaces when a high pass frequency response is required. In this paper, a spectral characterisation of perforated screens is presented. The analysis yields the generalised scattering matrix of each screen, which is a useful tool for studying composite structures. Numerical results, relative to single and double screens with periodical distribu... View full abstract»

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  • Correlation properties of rainfall rates in the United Kingdom

    Publication Year: 1988, Page(s):83 - 88
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (542 KB)

    Rainfall-rate data acquired from the UK Meteorological Office are analysed to obtain spatial correlation properties of rainfall rates at 23 locations in the UK. Correlation coefficients of the rainfall rates between two locations are derived, and dependences of separation distance, season, and integration time on the coefficients are clarified. Conditional correlation coefficients, obtained from r... View full abstract»

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  • Improved design of the Vivaldi antenna

    Publication Year: 1988, Page(s):89 - 92
    Cited by:  Papers (31)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    The Vivaldi antenna and its feeding transition is investigated. A tapered transition from microstrip to symmetric double sided slot line, fabricated on a low dielectric constant substrate, exhibits a very wide operating frequency range, with no need for a shorting hole. The parameters of the antenna which influence the constancy of beamwidth with frequency are discussed, and the ability to determi... View full abstract»

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  • Measurement of anechoic chamber reflections by time-domain techniques (antenna testing)

    Publication Year: 1988, Page(s):93 - 97
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (447 KB)

    Anechoic chamber reflection levels, as much as 50 dB down, can be measured at frequencies up to a few gigahertz, with broadband information derived from a single time-domain measurement. The technique has an advantage over frequency-domain methods because it can separate different reflections from each other, allowing any particular area of the walls to be studied in detail. The source of a partic... View full abstract»

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  • Design of log-periodic dipole antennas

    Publication Year: 1988, Page(s):98 - 102
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    The goal of the paper is to improve the log-periodic dipole antenna (LPDA) design procedure introduced by Carrel (1961). A computer-aided design technique is introduced, providing an easy-to-use design method of LPDAs. Corrections to Carrel's design contours, and new constant input resistance and truncation coefficients diagrams are presented. The influence of the feeder characteristic impedance, ... View full abstract»

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  • Dielectrically loaded wire antennas

    Publication Year: 1988, Page(s):103 - 110
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (592 KB)

    The complex electromagnetic problem of a dielectrically loaded curved wire antenna is formulated in terms of two coupled integral equations. The equations are solved by the method of moments to obtain the circuit and radiation characteristics of the antenna. The numerical algorithm is applied to the study of dielectrically loaded linear, loop, and helical wire antennas. The computed results are co... View full abstract»

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  • An alternative approach for designing narrowband antenna array processors with broadband capability

    Publication Year: 1988, Page(s):111 - 117
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (574 KB)

    An alternative approach to the design of narrowband antenna array processors with a specific broadband capability is presented. The approach consists of two parts. In the first part, the processor is constrained to have a unity gain in the desired look direction at the centre frequency of the frequency band of interest. In the second part, an additional set of linear constraints are used to ensure... View full abstract»

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  • Scattering of a long dipole field by parallel cylindrical scatterers

    Publication Year: 1988, Page(s):118 - 124
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (636 KB)

    The scattering of a long dipole antenna field by many conducting infinitely long circular cylinders has many engineering applications, such as the simulation of a cylindrical reflector antenna by circular cylinders, in which the feed is a long dipole. The dipole field is considered as incident on the cylinders, resulting in multiply-scattered fields between the cylinders, as well as between each c... View full abstract»

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  • Kummer and Tricomi functions for analysis of circular gyrotropic waveguides with azimuthal magnetisation

    Publication Year: 1988, Page(s):125 - 128
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (319 KB)

    The wave functions for propagation of rotationally symmetric modes in circular gyrotropic waveguides with azimuthal magnetisation (the complex Kummer and Tricomi confluent hypergeometric functions) are studied analytically and numerically. Based on specially compiled tables, families of curves are presented, illustrating the behaviour of both higher transcendental functions. The analysis allows a ... View full abstract»

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  • New method for computing Dolph-Chebyshev arrays, and its comparison with other methods

    Publication Year: 1988, Page(s):129 - 131
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (225 KB)

    A new algorithm for calculating the excitation coefficients of Dolph-Chebyshev arrays is based on reconstructing the Schelkunoff polynomial from its roots. The new method compares favourably with a number of others as regards speed of computation and/or sensitivity to the precision of the computer arithmetic employed.<> View full abstract»

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  • Conformal microstrip arrays on cylinders

    Publication Year: 1988, Page(s):132 - 134
    Cited by:  Papers (4)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (722 KB)

    Design and measured results for two X-band conformal microstrip arrays are presented. The two 4*4 arrays are built on the surface of a cylinder of small radius. They differ by the orientation of the elements relative to the cylinder axis. The measured directivities and radiation patterns are in reasonable agreement with theoretical predictions.<> View full abstract»

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  • Frequency-domain analysis of a large NEMP-simulator wire antenna

    Publication Year: 1988, Page(s):135 - 137
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (297 KB)

    Numerical results are presented for impedance, near-field, and far field, for a relatively large NEMP-simulator wire antenna in the frequency range 100 kHz to 100 MHz. The results were obtained by a program based, essentially, on the simultaneous Hallen-type equations of Kominami and Rokushima (1976, 1977, 1981).<> View full abstract»

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  • Novel method of measuring dielectric properties at 100 GHz using a groove-guide resonator

    Publication Year: 1988, Page(s):138 - 140
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (251 KB)

    Taking advantages of the low loss and open nature of the groove guide, and of relatively cheap linear transducers, a simple technique has been developed to measure dielectric properties at 100 GHz using a groove-guide resonator. The change of frequency or length to restore resonance before and after the insertion of the dielectric and the change of the respective Q-factor can be used to compute bo... View full abstract»

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  • Dual resonance

    Publication Year: 1988, Page(s):141 - 143
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (384 KB)

    Dual resonant modes in hollow cavities, and in dielectric resonators occur in degenerate pairs, having either identical, or very closely situated, resonant frequencies. Equivalent circuits for the input impedance of such dual-mode resonators are analysed and the behaviour of the impedance locus, typically observed with the vector network analyser, is described.<> View full abstract»

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