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IEEE Transactions on Antennas and Propagation

Issue 5 • Date September 1981

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Displaying Results 1 - 25 of 30
  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): 0
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  • Comments on the Bojarski identity

    Publication Year: 1981, Page(s): 825
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  • Correction to "A systematic design formulation for butler matrix applied FFT algorithm"

    Publication Year: 1981, Page(s): 825
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  • [Back cover]

    Publication Year: 1981, Page(s): c4
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    Freely Available from IEEE
  • 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 (336 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, and 0.3 \lambda . Representative values of the antenna load impedance, resistive, capacitive, and inductive, are us... View full abstract»

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  • A numerical study on realizable broad-band and equivalent admittances for dipole and loop antennas

    Publication Year: 1981, Page(s):707 - 717
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    Some realizable broad-band equivalent circuits for straight-wire and wire-loop structures are developed. The realizability of the circuits is explored in terms of the positive-real (PR) function properties of the circuit admittances. The postulate of PR "terminal eigenadmittances" as couched by Pearson and Wilton [8] is generally supported in the numerical examples, but a potential counterexample-... View full abstract»

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  • Rough surface scattering using specular point theory

    Publication Year: 1981, Page(s):798 - 800
    Cited by:  Papers (8)
    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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  • On the application of the GTD-MM technique and its limitations

    Publication Year: 1981, Page(s):780 - 786
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    In 1975 two techniques were published that combined the method of moments (MM) and the geometrical theory of diffraction (GTD). One technique extended the moment method through the use of the GTD while the second used the moment method to solve for unknown diffraction coefficients, thereby extending the use of the GTD. It is the latter method that is considered in this paper and is referred to as ... View full abstract»

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  • Some effects of the circumferential polarization of current on thin-wire antennas

    Publication Year: 1981, Page(s):815 - 817
    Cited by:  Papers (1)
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    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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  • Experimental performance of a thinned microwave imaging array

    Publication Year: 1981, Page(s):804 - 808
    Cited by:  Papers (1)
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    The performance of an experimental X -band "quad" array imaging system is reported. The configuration has a physical aperture of only 33 \lambda , with 204 radiating elements and constitutes a basis for low cost real-time imaging. 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 (55)  |  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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  • 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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  • 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 (312 KB)

    A simple horn suitable for illuminating a reflector subtending an angle near \pm45\deg in 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 fo... 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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  • A simplified expression of the dyadic Green's function for a conducting half-sheet

    Publication Year: 1981, Page(s):749 - 756
    Cited by:  Papers (6)  |  Patents (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Simple analytical expressions of the dyadic Green's function for a conducting half-sheet have been derived. These expressions involve some finite integrals which can be easily calculated by a digital computer and are much simpler than those involving the vector mode function expansion. Input impedances of monopole antennas on and near an edge of a conducting half-sheet and the impedance of a notch... 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 (48)
    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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  • Variational principles and variational functions in electromagnetic scattering

    Publication Year: 1981, Page(s):811 - 815
    Cited by:  Papers (1)
    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 Doppler effect for scattering by plane boundaries at normal incident

    Publication Year: 1981, Page(s): 825
    Cited by:  Papers (1)
    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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  • Results of a VHF propagation study

    Publication Year: 1981, Page(s):808 - 811
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 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...
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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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  • An adaptive low-angle tracking system

    Publication Year: 1981, Page(s):766 - 772
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A system for source tracking down to a fraction of a beamwidth of a surface with unknown multipath reflecting properties is described. The system has three major features: 1) the multipath returns are decorrelated by frequency diversity; 2) an efficient broad-band multiple beam antenna design is employed such that the data are characterized by a highly symmetrical (Toeplitz) correlation matrix; 3)... 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 (27)
    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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  • The design of microstrip dipole arrays including mutual coupling, part II: Experiment

    Publication Year: 1981, Page(s):761 - 765
    Cited by:  Papers (21)
    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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  • Rayleigh scattering and power conservation

    Publication Year: 1981, Page(s):795 - 798
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 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} where a is a characteristic dimension of the scatterer. Although the scattered power may be found correctly to order 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 (248 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 with 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