B. García Olmedo

Extension of Berenger's PML for bi-isotropic media

An extension of Berengers perfectly matched layer (PML) absorbing boundary conditions to adapt bi-isotropic media is formulated. The method is developed under simple algebraic conditions and validated with the finite-difference time-domain method (FDTD).

Extension of Berenger's absorbing boundary conditions to match dielectric anisotropic media

The authors propose an extension of Berengers perfectly matched layer (PML) absorbing boundary conditions (ABCs) to achieve a perfect matching of waves propagating in anisotropic media. Although the procedure to obtain the matching conditions is valid for any kind of anisotropic material, it has been validated with a lossless two-dimensional uniaxial medium, in which the optical axis is not contained in its plane section. The finite difference time domain method, with an alternative scheme for anisotropic media, is used to simulate the problem and to obtain the numerical reflection coefficient.

A time-domain near- to far-field transformation for FDTD in two dimensions

This paper proposes an algorithm based on the equi alence principle to calculate, straightforwardly in the time domain, the transient far field response of a two-dimensional structure. The algorithm implementation in ol es the numerical e aluation of a time integral along the nearto far-field con ersion contour of the equi alent currents at the ( ) Huygens surface, obtained with the finite-difference time-domain FDTD method. 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 427 432, 2000.

Generalization of Berenger's absorbing boundary conditions for 3-D magnetic and dielectric anisotropic media

A general method is deeloped which extends Berengers () ( ) perfect matching layer PML absorbing boundary conditions ABCs to achiee a perfect matching of waes propagating in 3-D magnetic and r or dielectric anisotropic media. The method isalidated with the finite-difference time-domain method. Q 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 126)130, 1998.

A UNIFIED LOOK AT BERENGER'S PML FOR GENERAL ANISOTROPIC MEDIA

The recently proposed general material-independent per- () fectly matched layer GMIPML and extended perfectly matched layer () EPML techniques sere to adapt general dielectric and magnetic anisotropic media. Perfect matching is achieed both by the former, based on a straight generalization of Berengers PML using a D and B formulation, and by the latter using an E and H formulation. In this paper, a general theory enclosing both formulations is proposed. 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 28:414 416, 2001.

New contributions to the spectral estimation by means of parametric modelling using rational transfer functions

Abstract In this paper we propose two methods to calculate the parameters of ARMA models. Both apply to discrete, time-invariant, linear systems whose input can be considered to have a flat spectrum envelope. Results are obtained by the application of these methods, as well as the Iterative Inverse Filtering (ITIF) method, to specific synthetic systems.

Improvements and extensions in FDTD for RCS calculations

The Contour Path (CP) method combined with a fourth order approximation to spatial derivatives is applied to calculate the RCS of conducting cylinders. A generalization of the CP method is also applied in scattering problems by 3D structures. The CP method provides a powerful technique to solve scattering problems for curved contours, as it allows smaller computer resources and higher accuracies. Combining both methods, the CP and the fourth order scheme, even higher accuracies are obtained. The results of this combination will be presented, both for three and two-dimensional geometries.