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Microwaves, Antennas and Propagation, IEE Proceedings

Issue 3 • Date Jun 1997

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Displaying Results 1 - 10 of 10
  • Weibull raindrop-size distribution and its application to rain attenuation

    Publication Year: 1997 , Page(s): 197 - 200
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (368 KB)  

    In the design of radio systems such as terrestrial and satellite communication links at frequencies above 10 GHz, rain attenuation is an important problem. A Weibull raindrop-size distribution is proposed by fitting the measurements of rainfall observed using a distrometer in Tokyo. A propagation experiment at 103 GHz is introduced. Rain attenuation coefficients are calculated by considering the M... View full abstract»

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  • Multimode equivalent network representation for the Y-junction of rectangular waveguides

    Publication Year: 1997 , Page(s): 161 - 166
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (420 KB)  

    Symmetrical Y-junctions in rectangular waveguides are commonly used components in microwave subsystems. The authors describe an alternative multimode equivalent network representation for this junction in terms of multimode admittance coupling matrices. The elements of the admittance coupling matrix are obtained as a summation of geometrical coefficients which are independent from either the frequ... View full abstract»

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  • Hybrid wave propagation in generalised Goubau-type striplines

    Publication Year: 1997 , Page(s): 167 - 171
    Cited by:  Papers (4)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (396 KB)  

    The propagation characteristics of hybrid modes in a layered dielectric waveguide loaded with one or two radial strips (Goubau-type striplines) are investigated. The analysis is based on systems of singular integral-integrodifferential equations of the first kind. The proposed algorithms are rapidly convergent, yielding very accurate results for the propagation constants and for the modal electric... View full abstract»

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  • Rigorous analysis of three-dimensional beam transmission through a dielectric slab

    Publication Year: 1997 , Page(s): 173 - 177
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (448 KB)  

    The plane-wave-spectrum technique is applied to study the transmission of a three-dimensional beam through a dielectric slab. The electromagnetic beam radiated from an aperture antenna is represented by an angular spectrum of plane waves. The use of three different co-ordinate systems using rectangular co-ordinates allows a rigorous formulation to be obtained. The near field transmitted through a ... View full abstract»

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  • Block tridiagonal matrix formulation for inhomogeneous penetrable cylinders

    Publication Year: 1997 , Page(s): 184 - 190
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (756 KB)  

    Analysis of penetrable two-dimensional scatterers is accomplished without the need to generate and solve a dense method of moments (MoM) matrix as is customarily done in the context of the volume integral formulation. Instead of the dense matrix, a rigorous tridiagonal block matrix is generated, for which the computational complexity is O(N2 ). In this new formulation, the body is divid... View full abstract»

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  • Moment-method analysis of circularly symmetric reflectors using bandlimited basis functions

    Publication Year: 1997 , Page(s): 179 - 183
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (456 KB)  

    To reduce the computational requirements, a quasilocalised, spatially bandlimited set of basis functions is adapted and explored in the context of the moment-method (MM) analysis of circularly symmetric reflectors. By considering the analysis of representative geometries, its performance is evaluated against results produced by entire-domain and local-domain basis functions. It is shown that the u... View full abstract»

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  • Diffraction by a quarterplane of the field from a halfwave dipole

    Publication Year: 1997 , Page(s): 191 - 196
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (524 KB)  

    The scattered far field from a halfwave dipole illuminating a perfectly conducting quarterplane is calculated. The calculation is based on a calculation of the radial electric and magnetic field components on the far-field sphere, using uniform geometrical theory of diffraction (GTD), and subsequent conversion of the radial fields into transverse field components using two elementary Green's funct... View full abstract»

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  • VLF wave generation using VLF heating: a pointer to a new technique for ELF wave production?

    Publication Year: 1997 , Page(s): 153 - 160
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (888 KB)  

    The generation of very-low-frequency (VLF) waves via the cubic nonlinearity of the ionosphere using a VLF `heater' at 16.4 kHz ±25 Hz (JXN Norway in FSK mode) and an adjacent `probe' VLF transmitter (Omega Norway) on 12.1 kHz is reported. The transmitters are located near Mo I Rana, on the west coast of Norway. This experiment relies on what may be a unique configuration of these two VLF tr... View full abstract»

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  • Simulation of Berenger's perfectly matched layer with a modified TLM node

    Publication Year: 1997 , Page(s): 205 - 207
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (224 KB)  

    A modified TLM symmetrical condensed node is proposed which allows direct implementation of Berenger's (see J. Comput. Phys., vol.114 ,no.2, p.185-200, 1994) PML in a variable mesh 3D-TLM method. A new scattering matrix is given and several tests are proposed to show the validity and efficiency of this modified node View full abstract»

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  • Polarisation-diversity phase-encoded patch-antenna transponder

    Publication Year: 1997 , Page(s): 201 - 204
    Cited by:  Papers (6)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (320 KB)  

    Application of phase encoding to a received RF signal, and retransmission of the signal phase encoded at the same frequency using polarisation-diversity, is used to design a simple two-port microstrip patch antenna which will permit single-frequency polarisation-diversity operation. The antenna is characterised in terms of its far-field radiation pattern and its two-port scattering parameters. An ... View full abstract»

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