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IEEE Transactions on Antennas and Propagation

Issue 7 • July 2006

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  • IEEE Transactions on Antennas and Propagation publication information

    Publication Year: 2006, Page(s): c2
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  • Analysis of arbitrarily shaped dielectric radomes using adaptive integral method based on volume integral equation

    Publication Year: 2006, Page(s):1910 - 1916
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB) | HTML iconHTML

    The adaptive integral method (AIM) is employed to solve the volume integral equation (VIE) for analyzing the radiation of the antenna with an arbitrarily shaped radome. Small dipoles are used as exciting sources. Modeling the radomes by tetrahedron cells, the induced volume current is determined by the AIM based on VIE. The application of AIM significantly reduces CPU time and computer memory requ... View full abstract»

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  • The use of curl-conforming basis functions for the magnetic-field integral equation

    Publication Year: 2006, Page(s):1917 - 1926
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB) | HTML iconHTML

    Divergence-conforming Rao-Wilton-Glisson (RWG) functions are commonly used in integral-equation formulations to model the surface current distributions on planar triangulations. In this paper, a novel implementation of the magnetic-field integral equation (MFIE) employing the curl-conforming n~×RWG basis and testing functions is introduced for improved current modelling. Implementation detai... View full abstract»

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  • Thin dielectric sheet simulation by surface integral equation using modified RWG and pulse bases

    Publication Year: 2006, Page(s):1927 - 1934
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1088 KB) | HTML iconHTML

    The conventional thin dielectric sheet surface integral equation, proposed by Harrington and Mautz, is reviewed. Due to its simplicity and inadequency for certain problems, a new surface integral equation is proposed to fill the gap. This new formulation takes both tangential and normal currents into account so that it can handle problems with high and low permittivity and grazing incident waves. ... View full abstract»

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  • An isotropy-improved nonstandard finite-difference time-domain method

    Publication Year: 2006, Page(s):1935 - 1942
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB) | HTML iconHTML

    By introducing extra degree of freedom into the space-domain stencils, an isotropy-improved nonstandard finite-difference (NSFD) (2,2) method is presented in this paper. The technique is also extended to the higher-order (2,4) stencils. Both analytical and numerical results are presented and compared to demonstrate the accuracy and the strengths of these methods. View full abstract»

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  • Nonuniform grid time domain (NGTD) algorithm for fast evaluation of transient wave fields

    Publication Year: 2006, Page(s):1943 - 1951
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB) | HTML iconHTML

    A novel algorithm to efficiently compute transient wave fields produced by known three-dimensional source constellations is proposed. The algorithm uses domain decomposition concepts and comprises two steps to be repeated for each subdomain considered. In the first step, delay- and amplitude-compensated fields, produced by sources residing inside each subdomain are computed at a sparse set of poin... View full abstract»

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  • Numerical modeling of a spherical array of monopoles using FDTD method

    Publication Year: 2006, Page(s):1952 - 1963
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2440 KB) | HTML iconHTML

    In this paper, the spherical-coordinate finite-difference time-domain method is applied to numerical analysis of phased array of monopoles distributed over a sphere. Outer boundary of the given problem is modeled by accurate spherical-coordinate anisotropic perfectly matched layer. The problem of increased cell aspect ratio near the sphere poles causing degradation of results is solved by dispersi... View full abstract»

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  • Be´zier representations for the multiobjective optimization of conformal array amplitude weights

    Publication Year: 2006, Page(s):1964 - 1970
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB) | HTML iconHTML

    For conformal phased arrays, generally the excitation amplitude of the array elements must be adjusted in order to maintain low sidelobes as the array is scanned. While the desired phase weights for maximum gain are deterministically set by the array geometry and scan angle, the representation of optimum low sidelobe amplitude weights remains an open problem. Following up on prior work using the e... View full abstract»

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  • Wave propagation and coupling in linear arrays with application to the analysis of large arrays

    Publication Year: 2006, Page(s):1971 - 1978
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB) | HTML iconHTML

    Waves inside linear arrays are analyzed for the case of single-port excitation. A frequency-domain method is proposed for the extraction of the amplitude decay and phase velocity of the waves, based on simulation results obtained for terminal excitation at one end and near the middle of the array. The waves reflected by the array ends are also extracted, under a single-reflection assumption. This ... View full abstract»

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  • Array thinning by using antennas in a Fabry-Perot cavity for gain enhancement

    Publication Year: 2006, Page(s):1979 - 1990
    Cited by:  Papers (88)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1440 KB) | HTML iconHTML

    A Fabry-Perot cavity (FPC) between a ground plane and a partially reflective surface (PRS) is used here to design array antennas with large distance between the radiating elements. This configuration provides some advantages: i) a reduction of the number of array elements to achieve high directivity; ii) large space between contiguous elements that may host a bulky feeding network as required for ... View full abstract»

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  • Performance of adaptive array antenna with arbitrary geometry in the presence of mutual coupling

    Publication Year: 2006, Page(s):1991 - 1996
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB) | HTML iconHTML

    The effect of the mutual coupling between the array elements on the performance of the adaptive array antennas (AAA) is investigated when the actual received voltages which include the mutual coupling are directly used to estimate the weight vector based on the adaptive algorithm. The output signal-to-interference-noise ratio (SINR), the convergence of the adaptive algorithm and the synthesized pa... View full abstract»

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  • A novel amplitude-phase weighting for analog microwave beamforming

    Publication Year: 2006, Page(s):1997 - 2008
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB) | HTML iconHTML

    A simple receiver and transmitter structure for smart antennas and phased array antennas is proposed. A new technique for amplitude and phase weighting in microwave domain is presented. Signals of different antenna elements are sampled using pulses with adjusted time delay and duty cycles. The first replica of the sampled signal is reconstructed to provide the proper phase shift and amplitude weig... View full abstract»

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  • Compact light weight UHF arrays using long slot apertures

    Publication Year: 2006, Page(s):2009 - 2015
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2224 KB) | HTML iconHTML

    A wideband low profile phased array using long slot aperture was recently developed for radar and EW applications. A prototype UHF array with 4 × 8 (32) elements (1.12 m×2.24 m×23 cm) was built and tested for 150-600 MHz operation. Array patterns, gain, and cross-pol level were measured. Excellent performance was observed. The array is 23 cm thick, and it weighs 7 kg (2.8 kg/m View full abstract»

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  • On the analysis of slotted waveguide arrays

    Publication Year: 2006, Page(s):2016 - 2021
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB) | HTML iconHTML

    A strategy for the full-wave analysis of slotted waveguide planar arrays is presented and demonstrated. The core of the method is a suitable segmentation of the antenna into two fundamental regions: an "internal" one, formed by the waveguide circuit, and the "external" one, consisting of the half space above the plate where the radiating slots are located. The internal region is further segmented ... View full abstract»

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  • On two types of convergence in the method of auxiliary sources

    Publication Year: 2006, Page(s):2022 - 2033
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB) | HTML iconHTML

    The method of auxiliary sources (MAS) is often applied to problems involving an externally illuminated, smooth, perfect electric conductor (PEC). One seeks to approximately satisfy the boundary condition on the PEC surface using N auxiliary sources located inside the PEC surface. Usually, the underlying auxiliary surface is also smooth and closed. The currents on the auxiliary sources ("MAS curren... View full abstract»

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  • Linear source in a circular tunnel

    Publication Year: 2006, Page(s):2034 - 2047
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB) | HTML iconHTML

    We study models for propagation in circular tunnels. The excitation is a fundamental electric current source. We produce expressions for the fields in terms of a Fourier transform over the axial variable. We perform an asymptotic analysis of the complex wavenumbers for use as initial estimates in a complex root finder. We then produce the modes in the lossy structure by contour integration techniq... View full abstract»

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  • Modified theory of physical optics solution of impedance half plane problem

    Publication Year: 2006, Page(s):2048 - 2053
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB) | HTML iconHTML

    The scattering of electric polarized plane waves from an impedance half plane problem is examined by the method of modified theory of physical optics (MTPO). Two integrals, consisting of incident and reflected scattered fields, are obtained. These integrals are evaluated asymptotically by the methods of stationary phase and edge point. The obtained scattered fields are compared with the exact solu... View full abstract»

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  • Electromagnetic scattering from vibrating penetrable objects using a general class of time-varying sheet boundary conditions

    Publication Year: 2006, Page(s):2054 - 2061
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB) | HTML iconHTML

    Calculation of electromagnetic (EM) scattering from vibrating penetrable cylinders of arbitrary cross-section is presented using a general class of time-varying sheet boundary conditions (SBCs) in conjunction with the method of moments (MoM). Sheet impedance and admittance expressions are first derived from the exact scattering solution for a penetrable circular cylinder with perturbed radius. The... View full abstract»

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  • On the role of measurement configuration in contactless GPR data processing by means of linear inverse scattering

    Publication Year: 2006, Page(s):2062 - 2071
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB) | HTML iconHTML

    This paper deals with a linear two-dimensional inverse scattering problem within a half space geometry with data gathered far away from the interface, which is relevant in ground penetrating radar contactless data processing. In particular, the role of the measurement configuration is discussed with regard to the information retrievable from multifrequency data. View full abstract»

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  • Bistatic scattering from rough dielectric soil surface with a conducting object partially buried by using the GFBM/SAA method

    Publication Year: 2006, Page(s):2072 - 2080
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB) | HTML iconHTML

    A hybrid approach of the generalized forward-backward method (GFBM) with spectral accelerate algorithm (SAA) and Monte Carlo method is developed in this paper. It is applied to numerical simulation of bistatic scattering from one-dimensional arbitrary dielectric constant soil surface with a conducting object partially buried under the horizontal and vertical tapered wave incident at low grazing an... View full abstract»

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  • Algebraic multigrid preconditioner for homogeneous scatterers in electromagnetics

    Publication Year: 2006, Page(s):2081 - 2087
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB) | HTML iconHTML

    Electromagnetic wave scattering from large and complex bodies is currently the most challenging problem in computational electromagnetics. There is an increasing need for more efficient algorithms with reduced computational complexity and memory requirements. In this work we solve the problem of electromagnetic wave scattering involving three-dimensional, homogeneous, arbitrarily shaped dielectric... View full abstract»

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  • Plane wave scattering and absorption by flat gratings of impedance strips

    Publication Year: 2006, Page(s):2088 - 2095
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB) | HTML iconHTML

    The problem of the plane wave scattering by a flat impedance-strip grating located in free space is considered. The formulation involves a set of generalized boundary conditions relating limiting values of the fields to effective electric and magnetic currents. We develop an accurate numerical solution to this problem using the dual series equations and the method of analytical regularization (MAR... View full abstract»

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  • Eigenmodes and scattering by an axial array of tape rings

    Publication Year: 2006, Page(s):2096 - 2104
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB) | HTML iconHTML

    Source-free and forced solutions for the electromagnetic fields in and around a periodic array of finite-length conducting cylinders are assembled from a Galerkin procedure using a Chebyshev polynomial basis with built-in edge-condition behavior. A localized source excites slow surface-waves under certain conditions on the electrical circumference and spacing of the tubular structure. These eigenm... View full abstract»

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  • Experimental verification of the reduction of coupling between dipole antennas by using a woodpile substrate

    Publication Year: 2006, Page(s):2105 - 2112
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1664 KB) | HTML iconHTML

    In this paper, the mutual coupling between dipole antennas placed on top of a woodpile structure is experimentally investigated. The coupling between dipoles backed by a woodpile substrate is compared with that obtained when the dipole antennas are placed on a dielectric substrate and when they radiate into free space. On average, between 2 and 7 dB reduction of the mutual coupling is achieved wit... View full abstract»

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  • Metamaterial-based efficient electrically small antennas

    Publication Year: 2006, Page(s):2113 - 2130
    Cited by:  Papers (127)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2104 KB) | HTML iconHTML

    A metamaterial paradigm for achieving an efficient, electrically small antenna is introduced. Spherical shells of homogenous, isotropic negative permittivity (ENG) material are designed to create electrically small resonant systems for several antennas: an infinitesimal electric dipole, a very short center-fed cylindrical electric dipole, and a very short coaxially-fed electric monopole over an in... 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                                                 Kwok W. Leung