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Antennas and Propagation, IEEE Transactions on

Issue 3 • Date Mar 1988

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Displaying Results 1 - 19 of 19
  • Low sidelobe electronically scanned antenna using identical transmit/receive modules

    Publication Year: 1988 , Page(s): 349 - 356
    Cited by:  Papers (3)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (568 KB)  

    A microwave network is described for use with identical transmit/receive modules such that amplitude-tapered aperture distributions are obtained with no loss. High-efficiency low-sidelobe patterns are calculated for the line source case with sidelobes as low as -27.5 dB. An optimum minimum-loss design is described for arbitrarily low sidelobes. The effects of errors on sidelobes are shown to be th... View full abstract»

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  • Eigenstructure based partially adaptive array design

    Publication Year: 1988 , Page(s): 357 - 362
    Cited by:  Papers (54)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (404 KB)  

    A procedure is presented for designing partially adaptive arrays having nearly fully adaptive performance under steady-state conditions. Theory predicts that the required adaptive dimension is less than or equal to the rank of the spatially/temporally correlated portion of the interference correlation matrix for arbitrary linearly constrained minimum-variance beamformers. Knowledge of the eigenstr... View full abstract»

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  • K-pulse techniques for short-pulse radiation from dipole arrays

    Publication Year: 1988 , Page(s): 363 - 368
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (420 KB)  

    An investigation of K-pulse techniques to transmit short-time duration pulses from dipole arrays is presented. The array is analyzed from a radiation standpoint using the singularity expansion method. The analysis also makes use of the method of moments to express the array's radiation in terms of the terminal voltages and pole singularities. Following a numerical search in the complex frequency p... View full abstract»

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  • Sidelobes control of solid-state array antennas

    Publication Year: 1988 , Page(s): 339 - 344
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (428 KB)  

    An aperture design is described for two-dimensional (2-D) solid-state phased arrays that transmits low sidelobes. A five-step amplitude distribution for the aperture was optimized by a gradient search method to achieve -36-dB peak sidelobes. The optimized configuration was applied to a sample array of 36 columns by 14 rows, with 400 modules divided into five groups of power levels. The array perfo... View full abstract»

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  • Time-dependent dyadic Green's functions for rectangular and circular waveguides

    Publication Year: 1988 , Page(s): 369 - 375
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (404 KB)  

    Closed-form expressions for the time-dependent dyadic Green's functions of electric and magnetic types for rectangular and circular waveguides are derived from the dyadic Maxwell equations in the time domain. These functions can be used to obtain the time-dependent electric and magnetic fields propagating in those guides due to any arbitrary time-dependent current distribution inside the guide. St... View full abstract»

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  • Electromagnetic scattering from ducts with irregular edges. II. Noncircular case

    Publication Year: 1988 , Page(s): 398 - 404
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (380 KB)  

    For pt.I see ibid., vol.AP-36, no.3, p.383-97 (1988). Electromagnetic scattering from finite noncircular ducts terminated with irregular edges is investigated. An edge-dependent entire-domain Galerkin expansion is proposed for the current variation on the duct wall, rigorously satisfying the edge conditions. The electric field integral equation is solved using this expansion for arbitrary noncircu... View full abstract»

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  • Asymptotic approximations in radome analysis

    Publication Year: 1988 , Page(s): 405 - 414
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (540 KB)  

    A detailed analysis is presented of assumptions and limitations of physical optics and stationary phase techniques for radome analysis. A two-dimensional ogival structure with an electric or magnetic line source inside is investigated. A method-of-moments analysis using J.H. Richmond's (1965) polarization current technique is performed to obtain reference results. Physical optics, uniform geometri... View full abstract»

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  • Two-port higher mode circular microstrip antennas

    Publication Year: 1988 , Page(s): 309 - 321
    Cited by:  Papers (43)  |  Patents (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (928 KB)  

    For circular microstrip antennas, single-mode design techniques work well for the dominant mode (n=1, where n is the azimuthal dependence of the fields in the antenna), but this is not the case for zero-order (n=0) and higher order (n>1) modes, where a modal expansion is necessary. The design of higher order dominant mode circular microstrip antennas is addre... View full abstract»

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  • Electromagnetic wave scattering by an infinite plane metallic grating in case of oblique incidence and arbitrary polarization

    Publication Year: 1988 , Page(s): 415 - 422
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (488 KB)  

    A novel spectral-domain method combined with a sampling theorem is applied to the rigorous analysis of this quasi-two-dimensional problem. The accuracy and convergence of the method are examined numerically taking into account errors in comparison with extrapolated values, errors in the power relation, and the duality relationship. It is found that the numerical results exhibit good convergence. A... View full abstract»

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  • Linear program synthesis for direct broadcast satellite phased arrays

    Publication Year: 1988 , Page(s): 345 - 348
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (260 KB)  

    Synthesis based on sampling functions in fixed positions was used to optimize the radiation pattern of antenna phased arrays for direct broadcast satellite applications. The synthesis procedure described obtains the antenna excitations required to create a shaped sector beam which uniformly illuminates a desired region and minimizes the maximum sidelobe level. The method begins with the composing ... View full abstract»

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  • Performance and design procedure of dual parabolic cylindrical antennas

    Publication Year: 1988 , Page(s): 331 - 338
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (548 KB)  

    The radiation characteristics of dual parabolic cylindrical antennas are studied, and the dependence of the principal plane beamwidths and the peak cross-polarization on their geometrical parameters is determined. The antenna aperture is rectangular in shape and generates an elliptical beam pattern, with a beamwidth ratio that can be controlled by the main and subreflector focal lengths. The far-f... View full abstract»

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  • Monopole impedance and gain measurements on finite ground planes

    Publication Year: 1988 , Page(s): 431 - 439
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (288 KB)  

    The possibility of making acceptably accurate monopole input impedance and gain measurements on a reduced-size ground plane is discussed. Existing measured and calculated data show that the diameter of a highly conducting ground plane should be at least 4λ (where λ is the wavelength) for measuring the input impedance of quarter-wavelength monopoles. At 25 MHz, the lowest frequency co... View full abstract»

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  • Dispersion by atmospheric water vapor at frequencies less than 1 THz

    Publication Year: 1988 , Page(s): 423 - 430
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (596 KB)  

    The refractivity of atmospheric water vapor at frequencies less than 1 THz is expressed as the sum of (1) the empirical radio refractivity, (2) a simple approximation to the line-by-line summation of dispersion contributions by resonances above 1 THz, and (3) a line-by-line summation over resonances below 1 THz. This simple approximation, which is valid in the temperature range -40°C to 40°... View full abstract»

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  • Simple rain attenuation prediction method for satellite radio links

    Publication Year: 1988 , Page(s): 444 - 448
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (272 KB)  

    The desirable features of a rain attenuation prediction method to be used in satellite radio link engineering are established, and a method satisfying such features is proposed. The method is tested over 77 satellite links situated in Europe, the USA, Japan, and Australia. Comparisons are made with the International Radio Consultative Committee (CCIR) method (CCIR, vol.V, Report 564, XVI Plenary A... View full abstract»

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  • Electromagnetic scattering from ducts with irregular edges. I. Circular case

    Publication Year: 1988 , Page(s): 383 - 397
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (728 KB)  

    A formulation is developed for electromagnetic scattering from finite circular ducts terminated with irregular edges. The analysis is based on the solution of the electric field integral equation using an entire-domain Galerkin expansion for both the axial and the circumferential variation of the currents, defined in terms of an edge-slope-dependent vector field that provides simplifying symmetry ... View full abstract»

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  • Interpolation methods for shaped reflector analysis

    Publication Year: 1988 , Page(s): 441 - 444
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (300 KB)  

    The diffraction analysis of reflector surfaces which are described only at a discrete set of locations usually leads to the requirement of an interpolation to determine the surface characteristics over a continuum of locations. Two methods of interpolation, the global and the local methods, are presented. The global interpolation representation is a closed-form or series expression valid over the ... View full abstract»

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  • Radiation characteristics of a source in a thin substrate mounted over a dielectric medium

    Publication Year: 1988 , Page(s): 322 - 330
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (552 KB)  

    The radiation pattern of a line source is calculated for the case in which the source is lying on the top or the bottom surface of a lossless dielectric substrate that is mounted on the top of semi-infinite dielectric medium. It is found that in both cases the pattern along the interfaces has a null; that the pattern in the upper semi-infinite medium has a single lobe; and that the pattern in the ... View full abstract»

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  • Comparison of measured and calculated antenna sidelobe coupling loss in the near field using approximate far-field data

    Publication Year: 1988 , Page(s): 438 - 441
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (344 KB)  

    Computer programs presently exist to calculate the coupling loss between two antennas provided that the amplitude and phase of the far field are available. It is shown that when this far-field information is not available it is possible to specify approximate far fields from a knowledge of the sidelobe of each antenna along the axis of separation and the electrical size of each antenna. The ENVLP ... View full abstract»

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  • The null field approach to electromagnetic scattering from composite objects

    Publication Year: 1988 , Page(s): 376 - 383
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (596 KB)  

    An improved null-field approach to scattering from composite objects is reported. Several alternative expressions for the transition matrix of a composite object are derived that partly or completely avoid the geometrical constraints inherent in previous null-field results for a composite scatterer. Some of the new versions make use of Q-matrices for the open surfaces which are defined by... 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