W. Tabbara

Electromagnetic fields estimation using spatial statistics

The spatial statistics formalism is applied to electromagnetic fields analysis. Fields are considered as realizations of a random function. Their spatial structure is studied by a method known as variographic analysis. To infer unknown values of the fields, an interpolation method called kriging is then used. It is shown how kriging can be performed on experimental or numerical data to speed up the fields estimation process.

Statistical analysis of the end current of a transmission line illuminated by an elementary current source at random orientation and position

The deterministic analysis of coupling between wireless communication systems and sensitive electronic devices connected by means of cables is intricate because of the variability of geometry. A statistical approach appears to be more appropriate. Application of such an approach is illustrated by the study of a simple transmission line illuminated by a short length dipole located above a ground plane or inside a typical room. The aim is to analyze the end current in the line by means of the quantile in terms of various factors.

Electromagnetic energy coupled to a monopole inside a perfectly conducting rectangular cavity

The electromagnetic energy coupled to a monopole placed inside a cavity with an aperture on one side is determined numerically and experimentally. Combining the equivalent dipole method for the aperture and an integral equation solution for the currents on the monopole, the voltage at the base of the latter is obtained over a large frequency band. The voltage sensitivity to the reaction of the field scattered, by the monopole and the inside walls, of the cavity on the field distribution in the aperture on one hand, and on the other hand to the accuracy of the design parameters of the cavity, is analyzed. Comparison with experimental results is done throughout this presentation.

MacFields: A computer aided introduction to vector analysis in electromagnetics

A new software for introducing vector analysis, MaceFields, has been developed and will be soon used as an introductory tool for teaching the basics of propagation and antennas in a continuing education course. The MacFields software has been designed for Macintosh computers by means of an Object Oriented Programming approach. Its aim is to illustrate the basics of the vector analysis operators, gradient, divergence and curl and their combination by allowing the student or the teacher to define fields, apply operators and visualize the results dynamically. It can be used independently or remotely controlled from other applications like HyperCard for training purposes.

Introducing Radio-Wave Propagation with Hypercard

An educational software developed for the introduction to radio-wave propagation is presented. Based on the HyperCard authoring system, the software is designed around the modelization of a classical radio or microwave link. Used in a continuing education program, organized for technicians and engineers involved more in the practical than in the theoretical aspects of propagation, this software greatly helps for the teaching of very short courses.

Reflection from a Grating of Quasi-Randomly Distributed Fibers. Integral Equation Representation vs. Homogenization Approach

A periodic set of parallel dielectric fibers is embedded in a lossless dielectric slab backed by an infinitely conducting plane. The period of the grating is such that only the zero order mode exists. Then the array behaves like a homogeneous medium. Each fiber is quasi-randomly distributed in the reference cell. We compare the average reflectivity obtained by the integral representation to a homogenization approach.