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Abstract-This paper describes a hybrid technique directly operating in time domain

This letter presents a new hybrid method that efficiently combines two versatile numerical techniques, viz., the finite difference time domain (FDTD) and the method of moments in the time domain (MoMTD). The hybrid method is applicable to complex geometries comprising arbitrary thin-wire and inhomogeneous dielectric structures. It employs the equivalence theorem to separate the original problem into two subproblems: 1) the region containing the wires, which is analyzed by using the MoMTD, and 2) the dielectric zone that is modeled with the FDTD. The application of the method is illustrated by analyzing two canonical problems involving thin wires and inhomogeneous media.Index Terms-FDTD, hybrid methods, method of moments, thin wires, time domain.

This paper presents some general ideas for the conin dielectric anisotropic waveguides. The goal is to facilitate the development of different finite schemes through the extension of &he time-domain (FDTD) method to study anisotropic media. Some of these schemes are particularized and applied to the simulation of the propagation of electromagnetic waves through planar dielectric anisotropic waveguides. the use of symbolic programs such as Mathematica. Section section v particularizes the results of Section 111 for two of planar anisotropic waveguides in birefringent media: one With the Optical axis rotated in the Plane of the Slab and the other in a plane perpendicular to the plane of the slab. Finally, in Section VI the described methods are tested. struction Of explicit finite algorithms to study wave propagation IV gives the basic ideas concerning dispersion and stability.

Abstract-A set of antenna-optimization problems is presented that satisfies the necessary requirements to form a test suite useful for measuring and comparing the performance of different evolutionary optimization algorithms (EAs) when they are applied to solve complex electromagnetic problems. The ability of the proposed test suite to find strong and weak points of any EA is illustrated by a complete study of four broadly used evolutionary algorithms carried out with the aid of the new test functions.

Abstract-The increased use of carbon-fiber composites in Unmanned Aerial Vehicles is a challenge for their EMC assessment by numerical solvers. For accurate and reliable simulations, numerical procedures should be tested not only for individual components, but also within the framework of complete systems. With this aim, this paper presents a benchmark test case based on experimental measurements coming from direct-current injection tests in the SIVA unmanned air vehicle, reproduced by a numerical Finite-Difference-Time-Domain solver that employs a new subgridding scheme to treat lossy composite thin panels. Validation was undertaken by applying the Feature Selective Validation method, which quantifies the agreement between experimental and numerical data.

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Fields created by a timedependent charge distributionSuppose a hounded distribution of time-dependent sources in free space is as shown in Figure 1. The retarded electric ( ( F , t ) The primary goal ofthis paper is tutorial. It discusses, from a and magnetic A(r,t) potentials at the observation point physical point of view, several basic features related to the transient radiation of electromagnetic waves by straight thin-wire P = P(r,O,q) and timet are given by IEEEAntennas a n d P r o p a g a t i o n Magazine. V o l , 4 1 No. 3. J u n e 1999