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IEE Proceedings H - Microwaves, Antennas and Propagation

Issue 2 • Date April 1985

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Displaying Results 1 - 14 of 14
  • 18¿26 GHz finline resonance isolators using hexagonal ferrites

    Publication Year: 1985, Page(s):73 - 76
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (538 KB)

    A finline resonance isolator is an attractive solution to the construction of millimetre wave isolators, except for the fact that a large direct magnetic field is normally required for its operation. One way to overcome this drawback is to employ an hexagonal ferrite material with a large internal uniaxial anisotropy energy. Such devices are simple to fabricate and provide perhaps the most practic... View full abstract»

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  • Automatic stepped-frequency six-port reflectometer for WG22

    Publication Year: 1985, Page(s):77 - 81
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (588 KB)

    A millimetre wave six-port reflectometer for the measurement of complex voltage reflection coefficient is described. The system is assembled from commercially available components and operates automatically from 26.5 to 40 GHz using a nominal 5 mW source. The paper also describes the means adopted to produce this broadband performance and the calibration method employed. View full abstract»

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  • Eigenfrequency distributions in multimode cavities

    Publication Year: 1985, Page(s):82 - 86
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (613 KB)

    Asymptotic eigenvalue distribution functions have been used in physics to approximate the actual frequency distribution of modes in resonant cavities. Certain versions of these formulas have been incorrectly applied to microwave cavity problems in engineering. A brief review of the relevant physics literature is presented along with some of the important results which should be used in engineering... View full abstract»

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  • Modern approaches to broadband matching problems

    Publication Year: 1985, Page(s):87 - 92
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (801 KB)

    The purpose of this paper is to review, from a practical viewpoint, analytic gain-bandwidth theory and commercially available CAD techniques as applied to matching problems. Modern approaches and so called real frequency techniques to gain bandwidth problems are summarised to provide the necessary background for the reader to gain easy access to the relevant literature. View full abstract»

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  • Generalised transmission line model for microstrip patches

    Publication Year: 1985, Page(s):93 - 98
    Cited by:  Papers (22)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (690 KB)

    A transmission line model for microstrip configurations, for which separation of variables is possible, is presented. For this, the patch is modelled as a transmission line joining the radiating apertures. Each section of the transmission line is replaced by a ¿¿-network. The effect of apertures in the direction perpendicular to the direction of propagation is included through the complex eigenval... View full abstract»

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  • Quasioptical components for 230 GHz and 460 GHz

    Publication Year: 1985
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (700 KB)

    Measurements of diplexers, lenses and feed horns for the frequency ranges 220¿¿230 GHz and 460¿¿495 GHz are reported, with particular emphasis on component insertion losses. At both frequencies best results are obtained using polarisation diplexers and Teflon lenses. Scalar feed horns are clearly preferable at 230 GHz whilst technological problems appear to indicate that simpler horns (dual mode, ... View full abstract»

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  • Microstrip circuit for converting microwave low power to DC energy

    Publication Year: 1985, Page(s):107 - 109
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (339 KB)

    The problem of locating and identifying objects (or persons) requires the system that has been designed using a small card carried by the object. When the object crosses the region of the high-frequency electromagnetic field created by a signal emitter, the card sends back a signal carrying a code characterising the object. The card is expected to be passive, and the code generator circuit is supp... View full abstract»

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  • Shaped dual-offset antenna with electric cone feed for DBS reception

    Publication Year: 1985, Page(s):110 - 114
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (608 KB)

    A dual-offset reflector with a foam dielectrics cone feed and a shaped subreflector is described. The antenna is designed to receive signals from direct broadcast satellites. It combines a compact design with a relatively high efficiency and low sidelobes. The paper describes the theoretical design procedure, including the shaping of the subreflector which corrects for distortions introduced by th... View full abstract»

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  • TM scattering from a conducting strip loaded by a dielectric cylinder

    Publication Year: 1985, Page(s):115 - 122
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (709 KB)

    The problem considered is that of determining the induced current on, and field scattered by, a two-dimensional, flat, perfectly electrically conducting strip, which is edge loaded by a dielectric cylinder of circular cross-section. The strip is orientated radially with respect to the centre of the cylinder, and can be located outside, inside, or partially inside and partially outside the cylinder... View full abstract»

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  • Low-frequency approach to the problem of a vertical wire antenna above an imperfect ground

    Publication Year: 1985, Page(s):123 - 126
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (442 KB)

    The problem of a vertical wire antenna placed above a flat lossy ground is formulated analytically in terms of the electric-field type (Pocklington-type) integral equation for current distribution on the antenna. The low-frequency approximation to the Sommerfeld integral appearing in the kernel of the equation is employed in the formulation. A numerical solution is obtained by the use of the piece... View full abstract»

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  • Representation of the electromagnetic fields of a dipole above an inhomogeneous half space

    Publication Year: 1985, Page(s):127 - 130
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (509 KB)

    The problem of a dipole above an inhomogeneous half space is considered. Both the permittivity and the permeability are assumed to be functions of the longitudinal direction in the inhomogeneous region. The direct field representation in terms of longitudinal or transverse field components is studied. Excitations by vertical magnetic dipoles, vertical electric dipoles, as well as horizontal dipole... View full abstract»

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  • Some extensions of the concept of complementary electromagnetic structures

    Publication Year: 1985, Page(s):131 - 137
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (840 KB)

    The well known Booker's concept of complementary electromagnetic structures is valid for plane, infinitely thin, perfectly conducting complementary screens situated in a homogeneous lossless medium. It is shown in the paper that the concept can be extended to include pairs of arbitrarily shaped dielectric and/or magnetic bodies, possibly lossy, of arbitrary values of complex permittivity and perme... View full abstract»

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  • Wave-hop method of calculating propagation at LF and VLF, and stationary phase

    Publication Year: 1985, Page(s):138 - 140
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (321 KB)

    The wave-hop method of calculating propagation at LF and VLF does not use the stationary-phase relation to determine reflection height and is therefore liable to error, particularly at short distances. Stationary phase is introduced into the wave-hop calculations and examples are given of the results. The errors are frequently very small but this is not always the case. View full abstract»

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  • Technical memorandum. six port reflectometer for the 75¿105 GHz band

    Publication Year: 1985, Page(s):141 - 143
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (354 KB)

    The construction, using standard directional couplers, of a six-port reflectometer for measurement of scattering parameters in the 75¿105 GHz band is reported. The broad band performance is assessed in terms of relative Q-centre positions. Ultimately performance is limited by the repeatability of waveguide flanges. View full abstract»

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