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IEE Proceedings H - Microwaves, Antennas and Propagation

Issue 2 • April 1986

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Displaying Results 1 - 14 of 14
  • Warped-mode multiway combline directional couplers

    Publication Year: 1986, Page(s):81 - 90
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1342 KB)

    A new general matrix theory of mode warping is advanced for directional couplers with nearestneighbour interaction and an arbitrary number of lines. The design procedure involves defining the form of the normal-mode vector, the type of `taper parameter¿¿ and then computing changes in the elements of the `wave-propagation¿¿ matrix due to differential changes of normal-mode vector. The wave-propagat... View full abstract»

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  • Finite element analysis of H-plane rectangular waveguide problems

    Publication Year: 1986, Page(s):91 - 94
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (387 KB)

    The equivalent circuit parameters of rectangular waveguide H-plane junctions, bends and obstacles may be found by a two-dimensional finite element method. Results are presented for perfectly conducting and dielectric obstacles, and for a waveguide bend. Good agreement is obtained with previously published results. View full abstract»

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  • Direct synthesis of the matched symmetric five-port junction from its scattering matrix

    Publication Year: 1986, Page(s):95 - 98
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (377 KB)

    The matched symmetric five-port is synthesised directly from its scattering matrix using the equation relating the admittance and scattering matrices. The significance of the overall phase of the scattering matrix in this procedure is discussed and two alternative five-ports illustrate this. The design technique may be used to design other junctions from a given scattering matrix, provided a suita... View full abstract»

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  • Automatic technique for the characterisation of a dielectric resonator coupled to a microstrip line

    Publication Year: 1986
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    An automatic computer controlled technique is proposed to measure the resonant frequency, loaded quality factor and coupling factor of a dielectric resonator coupled to a microstrip line. The complex transmission coefficient of the system is measured, as a function of frequency, by means of a network analyzer. At each frequency, the reflection coefficient is calculated and its magnitude is process... View full abstract»

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  • Metal-insert filters with improved characteristics

    Publication Year: 1986, Page(s):103 - 107
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    A computer-aided design is introduced for E-plane filters with single and double metal inserts within a reduced-width or increased-width waveguide section, respectively. This design achieves filter performances with high peak attenuation in a broad second stopband. The theory described includes both the higher-order mode interaction of all discontinuities and the finite thickness of the inserts. T... View full abstract»

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  • Prediction of the Fresnel region field of a compact antenna test range with serrated edges

    Publication Year: 1986, Page(s):108 - 114
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (767 KB)

    The performance of antenna systems is always influenced by diffraction effects. Diffraction problems may be analysed using physical optics or geometrical theory of diffraction. Here, the Fresnel field of a rectangular aperture with serrated edges is analysed using physical optics. The method can be applied very succesfully in compact antenna test range design for a fast prediction of the test-zone... View full abstract»

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  • E-field solution of TM-scattering from multiple perfectly conducting and lossy dielectric cylinders of arbitrary cross-section

    Publication Year: 1986, Page(s):115 - 121
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (615 KB)

    A simple moment solution is given for the problem of electromagnetic scattering from multiple conducting and lossy dielectric cylinders of arbitrary cross-section. The conductors may be of the form of strips and the dielectrics may be in the form of shells. The system is assumed to be excited by a plane wave polarised transverse magnetic to the axis of the cylinders. The equivalence principle is u... View full abstract»

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  • General dielectric-lens shaping using complex co-ordinates

    Publication Year: 1986, Page(s):122 - 126
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (471 KB)

    The formulation of design equations for shaped dielectric lenses is considered under the assumptions of geometrical optics. The use of complex co-ordinates to track the refracted-ray directions introduces a very flexible approach in which no symmetry assumptions are necessary. The problem of designing a lens to serve as an optical transformer for aperture distribution control is shown, in general,... View full abstract»

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  • Multioctave bandwidth log-periodic microstrip antenna array

    Publication Year: 1986, Page(s):127 - 136
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1208 KB)

    The application of the log-periodic technique to the series-fed electromagnetically coupled overlaidpatch array allows antennas with flat conformal characteristics and wide bandwidths to be obtained. A k-¿¿ analysis of this and other microstrip array types indicate that the microstrip patch is not an optimum element for log-periodic arrays and that direct connection will result in arrays having a ... View full abstract»

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  • Dual frequency antenna integration using invisible grating structures

    Publication Year: 1986, Page(s):137 - 142
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (774 KB)

    In many applications, particularly on aircraft, the integration of two or more antennas into the same physical area is desirable. A technique, using compensated grating structures, is described which offers the opportunity of constructing radiating elements and feeds which are `invisible¿¿ at a second frequency. This technique is described in detail and its application to microstrip and other simi... View full abstract»

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  • EM-wave guidance by a highly conducting surface in uniform motion

    Publication Year: 1986, Page(s):143 - 146
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (477 KB)

    The propagation of radio waves along a highly conducting surface in uniform motion is investigated using the normalised surface impedance concept and the special relativity principle. Guidance along a perfectly flat as well as slightly rough interface is examined. The direction of motion is taken either parallel to the guiding direction or perpendicular to the mean plane of the interface. In all c... View full abstract»

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  • Experimental HF circular array with direction finding and null steering capabilities

    Publication Year: 1986, Page(s):147 - 154
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (920 KB)

    The paper describes an HF-circular-array receiving and direction finding system which also offers a capability for null steering. The experimental array consists of four wideband active loop antennas which feed a 4 ¿¿ 4 Butler matrix. The action of the Butler matrix is to analyse the signals received by the array in terms of phase-mode components. Direction finding can then be carried out by measu... View full abstract»

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  • Nonuniformly spaced slot array antenna with low sidelobe pattern

    Publication Year: 1986, Page(s):155 - 158
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (457 KB)

    A numerical design method for a waveguide slot array antenna is proposed, by which the array, which has a low sidelobe pattern, is numerically designed. The slots are resonant, and the sources with cophasal excitations and desired amplitudes are designed by adjusting the space between the adjacent slots. It is shown theoretically that the desired low sidelobe pattern can be obtained by this method... View full abstract»

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  • Technical memorandum. Electronic tuning of high-Q VHF cavity resonators

    Publication Year: 1986, Page(s):159 - 161
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (569 KB)

    It is shown that fine tuning of high Q VHF coaxial cavity resonators over a range of some 500 kHz is possible using PIN diodes and capacitive probes, without serious degradation of the unloaded Q and without introducing severe nonlinearities. Coarse tuning over a range of several MHz is shown using switched loops. View full abstract»

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