IEEE Transactions on Antennas and Propagation

The problem of determining the electromagnetic field scattered by two-dimensional structures consisting of both dielectric and conducting cylinders of arbitrary cross section is considered. The conductors may be in the form of strips and the dielectrics may be in the form of shells. The conductors may be partially or fully covered by dielectric layers, while the dielectrics may be partially covere... View full abstract»

Far-field results obtained by two different methods are compared for the problem of electromagnetic scattering from dielectric objects. The two methods are the surface integral formulation, utilizing equivalent electric and magnetic surface currents, and the volume formulation, utilizing the equivalent electric polarization current. Triangular patches are used in the surface formulation and cubica... View full abstract»

In a previous study by the authors (1986) the phase matching of surface waves on prolate, perfectly conducting spheroids generated, for example, by the scattering of an incident plane electromagnetic wave was investigated. Now, the considerably more complex spheroidal case with an obliquely incident primary wave, whose scattering will give rise to helicoidally (i.e. quasihelically) propagating sur... View full abstract»

The problem of the determination of the fields scattered by an infinite dielectric cylinder of arbitrary cross section located at the interface between two semi-finite dielectric media is reduced to the solution of integral equations for unknown functions defined on the boundaries. These boundary functions are chosen so as to minimize their number. The incident field is that of a plane monochromat... View full abstract»

An exact solution to the problem of the scattering of a plane electromagnetic wave by two perfectly conducting arbitrarily oriented prolate spheroids is obtained by expanding the incident and scattered electric fields in terms of an appropriate set of vector spheroidal eigenfunctions. The incident wave is considered to be a monochromatic, uniform plane electromagnetic wave of arbitrary polarizatio... View full abstract»

A simple moment procedure is used to compute the scattering cross section of a small radome of arbitrary shape. Numerical results are presented for a radome with Von Karmon shape and a spherical shell. The computed and exact results for the spherical shell are in good agreement. Data for the Von Karmon shape are presented but not yet assessed. The method presented is found to be mainly limited to ... View full abstract»

A procedure is described for calculating scattering cross-section data based on the numerical solution of differential equations in the frequency domain. The scatterers considered are two-dimensional and consist of lossy, inhomogeneous dielectric, magnetic, and perfectly conducting material. The appropriate wave equation is combined with an approximate local absorbing boundary condition and discre... View full abstract»

The problem of high-frequency electromagnetic scattering by open-ended waveguide cavities with an interior termination is analyzed via three different approaches. When cavities can be adequately modeled by joining together piecewise separable waveguide sections, a hybrid combination of asymptotic high-frequency and modal techniques is employed. In the case of more arbitrarily shaped waveguide cavi... View full abstract»

The problem of electromagnetic scattering from a plate with a rim loading for transverse electric (TE) and transverse magnetic (TM) polarizations is investigated. The analysis is based on the work of R. Tiberio et al. (ibid., vol.AP-33, no.8, p.867-73, 1985) on the uniform geometrical theory of diffraction analysis of a wedge with two face impedances. The two-dimensional field is converted into th... View full abstract»

A mode analysis that is independent of detailed field expression is made of the total power Psc(ω) scattered from an electrically linear body of arbitrary size and shape, excited by a single-frequency incident field and loaded at a reference port. This load may be linear, nonlinear, and passive, or nonlinear and active at a given frequency ω. Psc... View full abstract»

The radar cross-section (RCS) analysis of open-ended cavities with rectangular and circular cross sections is carried out using the waveguide modal approach and the shooting-and-bouncing ray (SBR) approach. For a cavity opening on the order of ten wavelengths or larger, the comparison between the two approaches is excellent. It is also observed that at lower frequencies the SBR results deviate fro... View full abstract»

Rigorous diffraction coefficients are derived for the doubly and triply diffracted fields among impedance wedges of arbitrary orientation not sharing a common surface. The analysis is an extension of previous work applicable to impedance wedges on a common surface. The derived diffraction coefficients are shown to remain valid at the transition regions. Similar diffraction coefficients are also gi... View full abstract»

An experimental and theoretical study is reported on the polarization scattering properties of various radar targets with sizes in the resonance region. The targets have totally dielectric, totally conducting, or a combination of dielectric and metallic surfaces. A formulation of the scattering problem in terms of the equivalent currents on the surface of the scatterer is used, leading to surface ... View full abstract»

The application of near-field scattering measurements for determining the near-zone and far-zone radar cross section (RCS) of complex targets that are both physically and electrically large is reviewed and examined in the light of recent advances in near-field measurement technology and data processing capabilities View full abstract»

A numerical scheme to obtain radar cross section (RCS) of three-dimensional bodies of resonant size (BRS) with arbitrary geometry and material composition is described. The RCS is obtained by solving the electric-field integral equation (EFIE) using the conjugate gradient-fast Fourier transform method (CG-FFT). The choice of a suitable set of basis and testing functions to discretize the EFIE lead... View full abstract»

Scattering from three-dimensional cracks is analyzed and measured. The crack geometry is modeled as a rectangular groove in a perfectly conducting surface. The groove forming the crack may be terminated with an open aperture creating a slit in the conducting surface or with an impedance boundary creating a trough. The scattered fields from a crack are analyzed with two types of scattering mechanis... View full abstract»

A technique is presented for solving the problem of scattering by a three-dimensional body of revolution using a partial differential equation (PDE) technique in conjunction with a radiation boundary condition applied in the Fresnel region of the scatterer. The radiation boundary condition, which is used to truncate the PDE mesh, is based on an asymptotic expansion derived by Wilcox (1956). Numeri... View full abstract»

The authors describe the construction of a high-frequency solution in the geometrical theory of diffraction (GTD) format for the generation of edge-diffracted space rays and edge-excited surface waves by an electromagnetic wave normally incident on the edge of a curved impedance strip. The transformation coefficients necessary for the analysis of the diffraction on curved surfaces with equal vanis... View full abstract»