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IEEE Transactions on Antennas and Propagation

Issue 3 • Date March 1987

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Displaying Results 1 - 25 of 25
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): 0
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    Freely Available from IEEE
  • A theorem on the moment methods

    Publication Year: 1987, Page(s):353 - 355
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (343 KB)

    The inner product involved in the moment methods is usually an integral, which is evaluated numerically by summing the integrand at certain discrete points. In connection with this inner product, a theorem is proved, which states that the overall number of points involved in the integration must not be smaller than the number of unknowns involved in the moment method. If these two numbers are equa... View full abstract»

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  • [Back cover]

    Publication Year: 1987, Page(s): c4
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    Freely Available from IEEE
  • Signal bandwidth consideration of mutual coupling effects on adaptive array performance

    Publication Year: 1987, Page(s):337 - 339
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The effect of mutual coupling on the performance of a least mean square (LMS) adaptive array using dipole elements is analyzed in consideration of the signal bandwidth. The purpose here is to illustrate quantitatively the significance of the effect of mutual coupling. The results show that the effect in the broad-band signal cases is much greater than that in the narrow-band cases, particularly wh... View full abstract»

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  • Cross polarization caused by perturbed circular cross sections of waveguides and horn antennas

    Publication Year: 1987, Page(s):335 - 337
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The cross polarization caused by a perturbed cross section of the conical hybrid-mode horn is analyzed. The perturbed cross section is assumed to be slightly elliptical. The theory previously presented for cross polarization in a smooth-walled waveguide supporting the TE_{11} - mode is referred and applied to the HE_{11}...
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  • Eigenvalues of a dielectric-coated conducting cone

    Publication Year: 1987, Page(s):299 - 304
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The general problem of radiation/scattering from a dielectric coated semi-infinite conical structure excited by an arbitrary surface current distribution on the dielectric layer is formulated. Since the angular eigenfunction expansion is not suitable for this problem, the radial eigenfunction expansion is employed. The boundary value method is applied to obtain the fields in the form of infinite d... View full abstract»

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  • Feasibility of compact ranges for near-zone measurements

    Publication Year: 1987, Page(s):280 - 286
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    The purpose of this paper is to demonstrate the feasibility of using compact range reflector systems to make near-zone radiation or scattering measurements. This can be achieved by designing the compact range to provide a uniform spherical wave incident upon the antenna or scatterer under test. The basic design technique is demonstrated using the Scientific Atlanta reflector system which has been ... View full abstract»

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  • A time domain technique for mechanism extraction

    Publication Year: 1987, Page(s):305 - 312
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    The properties of scattered fields from a structure can be better evaluated from the characteristics of the individual scatterers. Decomposition techniques can be classified either as a matrix or an integral formulation. With either formulation, aspect pattern or frequency information of a scattering center can be obtained. Emphasis will be placed on an integral (time domain) isolation extraction ... View full abstract»

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  • The design of transverse slot arrays fed by the meandering strip of a boxed stripline

    Publication Year: 1987, Page(s):252 - 257
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Transverse slots fed by a boxed stripline, with the strip passing centrally under the slot at an angle which controls the coupling, have been investigated theoretically and experimentally. A procedure has been developed which permits the design of arrays of such slots, including the effects of external mutual coupling. Agreement between theory and experiment has been found to be good for both a si... View full abstract»

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  • Scattering from a microstrip patch

    Publication Year: 1987, Page(s):245 - 251
    Cited by:  Papers (129)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    A solution to the problem of plane wave scattering by a rectangular microstrip patch on a grounded dielectric substrate is presented. The model does not include the microstrip feed, and thus does not include the so-called "antenna mode" component of the scattering. The solution begins by formulating an electric field integral equation for the surface current density on the microstrip patch. The in... View full abstract»

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  • Rain attenuation from log-normal and Weibull raindrop-size distributions

    Publication Year: 1987, Page(s):358 - 359
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The rain attenuation from 1 to 1000 GHz was calculated by using both log-normal and Weibull distributions for raindrop size. The results were compared with the recent microwave measurements from 8.4 to 312.5 GHz at the rain rate R = 50 mm/h. The log-normal distribution leads to a higher estimate of attenuation than both the Weibull distribution and the exper... View full abstract»

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  • Characteristic modes for a slot in a conducting plane, TM case

    Publication Year: 1987, Page(s):331 - 335
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Consider an infinitely long slot in a conducting plane in an unbounded medium illuminated by a uniform transverse magnetic (TM) (to the slot axis) plane wave. The theory of characteristic modes for apertures is applied to solve the problem. For a narrow slot, analytic expressions for the first two characteristic currents and the equivalent magnetic current are given. As computed by the method of m... View full abstract»

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  • Scattering by parallel conducting circular cylinders

    Publication Year: 1987, Page(s):355 - 358
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The multiple scattering by two parallel conducting circular cylinders is considered. The total scattered field is divided into two components, namely a noninteraction term and a term due to all interactions between the cylinders. The noninteraction term is expressed exactly, whereas the interaction field is evaluated using the method of moments. It is found that this technique leads to an efficien... View full abstract»

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  • The radiation pattern of a surface loaded ellipsoidal reflector

    Publication Year: 1987, Page(s):347 - 349
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The radiation patterns of the focus-fed axially symmetric and loaded ellipsoidal antennas in E - and H -planes are calculated by using the generalized method of geometrical theory of diffraction (GTD). The chosen loads are resistive types which are described in terms of surface impedances. View full abstract»

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  • Use of imaging with spatial filtering in reflector antennas

    Publication Year: 1987, Page(s):258 - 267
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    The classical problem of illuminating efficiently the aperture of a reflector antenna is discussed. We combine a small feed with an ellipsoidal reflector producing, directly on the main reflector, a magnified image f(x, y) of the feed aperture distribution f_{0}(x_{0}, Y_{0}) . The transformation relating the feed dist... View full abstract»

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  • A study of a monopole arbitrarily located on a disk using hybrid MM/GTD techniques

    Publication Year: 1987, Page(s):287 - 292
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The input impedance of a monopole located off-axis on a disk and oriented in an arbitrary direction is investigated using hybrid method of moments/geometrical theory of diffraction (MM/GTD) techniques. The equivalent currents method (ECM) and the uniform geometrical theory of diffraction (UTD) are used to ensure a proper treatment of each situation. A criterion for switching from UTD to ECM in the... View full abstract»

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  • An improved main reflector design for compact range applications

    Publication Year: 1987, Page(s):342 - 347
    Cited by:  Papers (16)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Compact ranges offer many advantages over other types of ranges, and as a result much effort is being directed toward the improvement of their performance. The use of concave edge contours and blended rolled edge terminations to reduce the unwanted energy diffracted into the target zone from the termination of the main reflector is discussed. The proposed shaping of the edge contour minimizes the ... View full abstract»

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  • Multilook images of ocean waves by synthetic aperture radars

    Publication Year: 1987, Page(s):313 - 318
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    A property of multilook processing of synthetic aperture radar (SAR) data is that a time lapse exists between subapertures, so that they contain information about a scattering surface at different times. Reported here is a theoretical study on the images of dynamic ocean waves processed by this technique. It is shown that due to the time lapse the subimages of a moving ocean wave differ in positio... View full abstract»

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  • Simulation of a cylindrical reflector by conducting circular cylinders

    Publication Year: 1987, Page(s):349 - 353
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A cylindrical reflector is simulated by N parallel circular conducting cylinders of arbitrary radius and distribution along the trajectory of the continuous reflector surface. The resulting radiation pattern of the transmitting reflector antenna is computed as the backscattering pattern of the circular cylinders due to a line source excitation. The results for ... View full abstract»

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  • Nonuniform sampling techniques for antenna applications

    Publication Year: 1987, Page(s):268 - 279
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1200 KB)

    Recent investigations have demonstrated that uniform sampling techniques can be effectively applied for construction of far-field patterns of antennas. There are, however, many circumstances for which it may not be practical to directly utilize uniform sampling techniques. A two-dimensional sampling technique which can employ irregularly (nonuniformly) spaced samples (amplitude and phase) in order... View full abstract»

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  • Axial ratio of an antenna illuminated by an imperfectly circularly polarized source

    Publication Year: 1987, Page(s):339 - 342
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A method for determining the axial ratio of an antenna illuminated by an imperfectly circularly polarized source is described. This method requires measurements of the right- and left-handed amplitude components and their relative phases for both the receiving and transmitting (or source) antennas. From these measured data and, of course, the theory of power transfer between the source and receivi... View full abstract»

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  • High-frequency surface field excited by a magnetic line source on an impedance cylinder

    Publication Year: 1987, Page(s):293 - 298
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The evaluation of the transverse electric (TE) surface field on an impedance boundary circular cylinder, excited by a magnetic current on the same surface is discussed. The source is of infinite axial extent. The integral which describes the field due to a single surface ray is evaluated numerically and asymptotically. The results compare well with each other as well as with the eigenfunction solu... View full abstract»

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  • A comparison of time delay spread and signal level measurements within two dissimilar office buildings

    Publication Year: 1987, Page(s):319 - 324
    Cited by:  Papers (66)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    A detailed analysis of time delay spread and signal level measurements at 850 MHz was performed within a large office building. The results were compared with studies of a much smaller and dissimilar office building. The results were found to be substantially the same, despite the physical differences of the buildings themselves. This may be due to external geographical features. Overall worst-cas... View full abstract»

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  • A note on antennas: Definitions and methods

    Publication Year: 1987, Page(s):325 - 327
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Definitions of scattered and diffracted fields, originally given by R. F. Millar, are reviewed and supplemented. The definitions are used to discuss relations between results obtained by commonly used pattern prediction methods for reflector antennas. View full abstract»

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  • The coaxial collinear antenna: Current distribution from the cylindrical antenna equation

    Publication Year: 1987, Page(s):327 - 331
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A theoretical model and computer simulations of the current on the coaxial collinear (COCO) antenna are presented. Comparisons between numerical results and measurements are made for 24- and 26-element COCO antennas at 50 MHz and for six- and eight-element COCO antennas at 915 MHz. The results show reasonable agreement between first-order theory and measurements. View full abstract»

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Aims & Scope

IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas.

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Meet Our Editors

Editor-in-Chief                                                 Kwok W. Leung