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IEEE Transactions on Antennas and Propagation

Issue 5 • September 1981

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  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): 0
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    Freely Available from IEEE
  • Theoretical aspects of the physical realizability of broad-band equivalent circuits for energy collecting structures

    Publication Year: 1981, Page(s):697 - 707
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1030 KB)

    The practical implementation of equivalent circuits that represent the energy delivered to an arbitrary load impedance by an antenna or a port on a scatterer is discussed. Particular attention is paid to the positive-real (PR) function issues associated with the equivalent admittance of the structure when evolved from the point of view of the singularity expansion method (SEM). A proof is given wh... View full abstract»

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  • Rayleigh scattering and power conservation

    Publication Year: 1981, Page(s):795 - 798
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (297 KB)

    In the usual formulation of Rayleigh scattering in terms of the quasi-static dipole moments of the scatterer, the scattered field is evaluated exactly to the lowest order(k_{0}a)^{3}whereais a characteristic dimension of the scatterer. Although the scattered power may be found correctly to order(k_{0}a)^{6}in terms of the scattered field, power conservation does no... View full abstract»

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  • A simple wide-angle horn for the 4-GHz and 6-GHz bands

    Publication Year: 1981, Page(s):800 - 802
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (299 KB)

    A simple horn suitable for illuminating a reflector subtending an angle nearpm45degin the 4- and 6-GHz communications bands is described. The horn has excellent voltage standing-wave ratio (VSWR) characteristics, with cross-polar sidelobes less than -22 dB across the entire 1.74:1 bandwidth. From the background information presented, a horn of similar form could be developed for more ge... View full abstract»

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  • Experimental performance of a thinned microwave imaging array

    Publication Year: 1981, Page(s):804 - 808
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (429 KB)

    The performance of an experimentalX-band "quad" array imaging system is reported. The configuration has a physical aperture of only33 lambda, with 204 radiating elements and constitutes a basis for low cost real-time imaging. View full abstract»

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  • Results of a VHF propagation study

    Publication Year: 1981, Page(s):808 - 811
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Beyond-line-of-sight ground-wave propagation measurements were made near 30 MHz, 54 MHz, and 148 MHz over two different propagation paths 42 km and 51 km in length. Data were collected over a period of six weeks using a vehicle-mounted vertically polarized transmitting antenna (whip) and fixed position Yagi receiving antennas. Results presented here include(S + N)/Nratios observed at th... View full abstract»

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  • Current distribution on a receiving dipole antenna

    Publication Year: 1981, Page(s):817 - 822
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The current distribution on a receiving dipole antenna is dependent on its feed-point load impedance. Calculations based on the modified King-Middleton approximation have been made of the distribution for antenna half lengths of 0.1, 0.2, 0.25, and0.3 lambda. Representative values of the antenna load impedance, resistive, capacitive, and inductive, are used to show their effects on the ... View full abstract»

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  • Dielectric rod leaky-wave antennas for millimeter-wave applications

    Publication Year: 1981, Page(s):822 - 824
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    Dielectric rod leaky-wave antennas have the property of being frequency scannable. Bounds are derived for the proper range of spacing of perturbations along the rod to avoid an intrusion upon a grating lobe when frequency scanning. In addition some experimental results are reported on sidelobe levels and polarizations in the far field for these antennas made from a material withepsilon_{r}= 2... View full abstract»

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  • Comments on the Bojarski identity

    Publication Year: 1981, Page(s): 825
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (95 KB)

    First Page of the Article
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  • Correction to "A systematic design formulation for butler matrix applied FFT algorithm"

    Publication Year: 1981, Page(s): 825
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (95 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1981, Page(s): c4
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    Freely Available from IEEE
  • Some effects of the circumferential polarization of current on thin-wire antennas

    Publication Year: 1981, Page(s):815 - 817
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Although small, the circumferential polarization of current on thin-wire antennas has a very substantial effect on the circumferential variation of the longitudinal component of current. View full abstract»

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  • Inverse scattering of a layered and dispersionless dielectric half-space, part I: Reflection data from plane waves at normal incidence

    Publication Year: 1981, Page(s):726 - 732
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    An inverse scattering theory and two inversion algorithms for the reconstruction of the dielectric profile of an inaccessible, layered, and dispersionless half-space are presented. The source and receiver are located at a distance above the inaccessible region. The source is an artificial electromagnetic source which is assumed to be capable of radiating plane waves at normal incidence for all the... View full abstract»

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  • Variational principles and variational functions in electromagnetic scattering

    Publication Year: 1981, Page(s):811 - 815
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Using the Lagrange multiplier technique, the variational principles for the scattering amplitude of scalar and electromagnetic waves due to reflecting surfaces are derived in a novel way. Formulation of a variational principle for a function provides an alternative approach for obtaining variational estimates of functionals. The method provides a general prescription for formulating variational pr... View full abstract»

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  • The design of microstrip dipole arrays including mutual coupling, part II: Experiment

    Publication Year: 1981, Page(s):761 - 765
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Experiments are described from which determination can be made of the self and mutual impedance for microstrip dipoles and of the backscattering relation involving the radiating current. Functional representations of these sources of input data then permits the design of planar microstrip dipole arrays, including the effects of mutual coupling. The design, construction, and performance of a typica... View full abstract»

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  • Control of reflector antennas performance by rim loading

    Publication Year: 1981, Page(s):773 - 779
    Cited by:  Papers (13)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    An analysis of the behavior of reflector antennas loaded by a surface impedance along a peripherical rim is carried out in order to ascertain the possibility of improving their performance by such a loading technique. Both single and dual (Cassegrain) reflector antennas are considered. It is shown that an effective control of the radiated field can be achieved by the proper choice of the loading c... View full abstract»

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  • Rough surface scattering using specular point theory

    Publication Year: 1981, Page(s):798 - 800
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The expression for the average scattering cross section for a random surface is derived using the stationary phase approximation for the scattered field due to specular points on a finitely conducting rough surface. A previous error in the literature is corrected by showing that the proper result is proportional to the average value of the product of the number of specular points per unit area and... View full abstract»

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  • GTD analysis of the radiation patterns of a shaped subreflector

    Publication Year: 1981, Page(s):792 - 795
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    A technique of analyzing the principal plane radiation patterns of a subreflector shaped using the method enunciated by Collins [1] has been presented. The analysis is based on the uniform geometrical theory of diffraction (UGTD) [2], and a simplified procedure has been adopted in the determination of the principal plane radii of curvature of the subreflector. The numerical results obtained based ... View full abstract»

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  • Analysis of an over-constrained adaptive array

    Publication Year: 1981, Page(s):802 - 804
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    In antenna arrays, the number of nulls that can be formed independently is equal to or less than the number of array elements minus one. Therefore, if the number of interferences exceeds the number of freedom for pattern synthesis in adaptive arrays, nulls in the radiation pattern can not be steered toward each interference direction. To clarify the behavior of the adaptive array in such an enviro... View full abstract»

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  • Approximate boundary conditions

    Publication Year: 1981, Page(s):826 - 829
    Cited by:  Papers (94)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Approximate boundary conditions are a means for simulating material and surface effects in scattering and propagation. A number of conditions are discussed, and criteria are given for their validity. View full abstract»

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  • On the performance of a polarization sensitive adaptive array

    Publication Year: 1981, Page(s):718 - 725
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    The ability of a least mean square (LMS) adaptive array to adapt to the electromagnetic polarization of incoming signals is considered. An array of two pairs of crossed dipoles is studied. A desired signal and an interference signal are assumed to arrive from arbitrary directions with arbitrary elliptical polarizations. The output signal-to-interference-plus-noise ratio (SINR) from the array is co... View full abstract»

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  • The design of microstrip dipole arrays including mutual coupling, part I: Theory

    Publication Year: 1981, Page(s):757 - 760
    Cited by:  Papers (33)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A theory is developed to explain the behavior of planar arrays of microstrip dipoles. Relations are obtained involving the active input impedances of individual dipoles (thus recognizing the effects of mutual coupling) and the radiating currents in the dipoles resulting from a set of impressed voltages. These relations permit the establishment of a design procedure with the goals of an input imped... View full abstract»

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  • The Doppler effect for scattering by plane boundaries at normal incident

    Publication Year: 1981, Page(s): 825
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (96 KB)

    For original papers see ibid., vol.AP-28, p.791-95 (1980) and also ibid., vol.AP-29, p.639-37 (1981). In the analysis of the one-dimensional scattering problem involving a velocity dependent boundary, the simple example of the harmonically vibrating boundary has been considered in detail. It appears that the authors were unaware of existing work by the author of the present note, which includes th... View full abstract»

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  • Radar imaging from a distorted array: The radio camera algorithm and experiments

    Publication Year: 1981, Page(s):740 - 748
    Cited by:  Papers (64)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    High angular resolution radar imaging may be achieved with a large-aperture antenna even if the aperture is distorted, provided that adaptive signal processing compensates for the distortion. The radio camera is an instrument designed for this purpose. Its algorithm for imaging ground-based targets is described and experimental results are given for a 3 cm wavelength demonstration system using a d... View full abstract»

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  • On the integral equation of piecewise linear antennas

    Publication Year: 1981, Page(s):787 - 792
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    An efficient computation technique for obtaining the current distribution on a piecewise linear antenna is presented. The generalized Hallen's type integral equation with closed form kernel is formulated and then solved numerically by the collocation method. Numerical and experimental results for the gull shape and the trapezoidal tooth wire antennas are included. View full abstract»

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

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Editor-in-Chief                                             Danilo Erricolo