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IEE Proceedings - Microwaves, Antennas and Propagation

Issue 4 • Aug 1999

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Displaying Results 1 - 12 of 12
  • Efficient wavelet-based modelling of printed circuit antenna arrays

    Publication Year: 1999, Page(s):298 - 304
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (496 KB)

    The authors present a wavelet-based formulation of the method of moments for the full-wave analysis of printed circuit antennas and arrays. The rooftop multiresolution basis is introduced for the expansion of planar currents. These basis functions satisfy the boundary and edge conditions in an exact manner. It is shown that wavelet-dominated expansion bases generate highly sparse moment matrices. ... View full abstract»

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  • Method of lines for the calculation of excess capacitance for a cylindrical via hole in multilayer packaging

    Publication Year: 1999, Page(s):285 - 291
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (488 KB)

    The method of lines (MOL) is extended for the analysis of different geometries that include both rectangular and cylindrical conductors. The method of analysis is valid for multilevel dielectric structures. The cylindrical conductors can have circular pads and rectangular microstrips that are attached to the pads or the main body of the cylindrical via (buried microstrips). The mixed structures ca... View full abstract»

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  • Scattering matrix of a directional coupler with ideal transformers

    Publication Year: 1999, Page(s):295 - 297
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    A directional coupler suitable for operation in the low radio frequency range (1-100 MHz) can be built by using a combination of two transformers. An analysis of such a device, under the assumption that the transformers are ideal, leads to explicit equations for the scattering parameters of the directional coupler. Two different applications are analysed, one with a loose coupling and another with... View full abstract»

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  • Microstrip line-fed L-strip patch antenna

    Publication Year: 1999, Page(s):282 - 284
    Cited by:  Papers (28)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (188 KB)

    A wideband electromagnetic-coupled single-layer microstrip patch antenna is studied experimentally. With dielectric and foam substrates of total thickness ~0.13 λ0, a rectangular patch antenna with impedance bandwidth (SWR ⩽2) of 49% and 3 dB gain bandwidth of 54% are obtained. It has an average gain of 6.5 dBi and stable radiation patterns across the passband. Furthermore, w... View full abstract»

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  • Reflection of obliquely incident plane wave from chiral slab backed by soft and hard surface

    Publication Year: 1999, Page(s):271 - 276
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    The general case of a plane wave reflection from a chiral slab backed by a soft and hard surface is considered. Fields in the chiral slab are represented in right-hand and left-hand circularly polarised basis. The same basis is used to derive the reflection dyadic. Expanding fields in circularly polarised vectors are advantageous, because circularly polarised waves are the eigenwaves of the chiral... View full abstract»

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  • Polarisation conversion at a textured surface

    Publication Year: 1999, Page(s):241 - 246
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    It has previously been shown that the electric vector of visible-wavelength radiation can be rotated through 90° by reflecting photons from a suitably aligned diffraction grating. The phenomenon has now been directly extended to the microwave regime, and the use of gratings exhibiting a finite number of grooves has been investigated. While efficient conversion has been obtained from gratings c... View full abstract»

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  • Mutual coupling between rectangular dielectric resonator antennas by FDTD

    Publication Year: 1999, Page(s):292 - 294
    Cited by:  Papers (6)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (196 KB)

    The mutual coupling between aperture-coupled rectangular dielectric resonator antennas is analysed using the finite-difference time-domain method. The perfectly matched layer is used as absorbing boundary conditions. The voltage excitation source of microstrip structure is based on a simple model, in which the source plane or the terminal plane can be moved very close to the discontinuity so that ... View full abstract»

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  • Circularly polarised back-to-back microstrip antenna with an omnidirectional pattern

    Publication Year: 1999, Page(s):277 - 281
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    A new configuration for a circularly polarised microstrip antenna with an omnidirectional pattern is proposed, This antenna consists of two rectangular patches with perturbation segments, which are arranged back-to-back relative to a coplanar waveguide (CPW) on a ground plane. The characteristics of the proposed antenna are clarified by experiments, and the mechanism to produce the circular polari... View full abstract»

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  • Theoretical analysis of sensitivity and Q-value for recursive active microwave integrated filters

    Publication Year: 1999, Page(s):247 - 252
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    High-Q active MMIC filters have very low tolerances for temperature drift and process parameter deviations. A theoretical analysis of how these problems limit the Q-value of recursive active MMIC filters is presented. Given that the highest tolerable deviation in filter gain is equal to 1 dB for a temperature drift of 5°C, the Q-value is shown to be limited to 30 if one assumes perfectly imped... View full abstract»

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  • Application of vector parabolic equation method to urban radiowave propagation problems

    Publication Year: 1999, Page(s):253 - 256
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    The vector parabolic equation method is applied to the modelling of radiowave propagation in the urban environment. As a paraxial version of Maxwell's equations it allows full treatment of 3D electromagnetic scattering which was not possible with scalar versions of the algorithm. The method allows detailed specification of the building geometry and electrical parameters. This approach is particula... View full abstract»

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  • Sensitivity analysis of Jaumann absorbers

    Publication Year: 1999, Page(s):257 - 262
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    Jaumann absorbers show promise as radar absorbing materials (RAMs) for suppressing scattering reflections or reducing the radar cross-section (RCS) of perfectly conducting scatterers. Although various optimised designs are reported in the literature, there is little information on sensitivity of performance to manufacturing errors in the spacers and sheet resistances. The paper reports the finding... View full abstract»

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  • Robust HF data communications at high latitudes

    Publication Year: 1999, Page(s):263 - 269
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    It is well known that the ionosphere can be highly disturbed in the auroral and polar cap regions. However, efforts to quantify ionospheric effects on high-frequency communications have concentrated mainly on lower-latitude regions. The Doppler and multipath sounding network (DAMSON) has been used in an extensive campaign to measure the channel characteristics on four paths in the auroral region o... View full abstract»

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