A.S. Ilyinski is a Professor in the Department of Computational Mathematics and Cybernetics and is Head of the Computational Electrodynamics Laboratory at Moscow State University. He obtained the Doctor of Physical and Mathematical Sciences degree in 1974. His research interests lie in the mathematical modelling of electromagnetic wave scattering, irregular waveguides, microstrip theory, antennas and antenna arrays.G.Ya. Slepyan is a leading research scientist at the Institute of Nuclear Problems at Belarus State University, Minsk. In 1988 he obtained the Doctor of Physical and Mathematical Sciences degree from Kharkov State University. His research areas include electromagnetic field theory, microwave engineering, free-electron lasers, radiation and scattering in nonlinear media.A.Ya. Slepyan is a senior research scientist at the Minsk Radioengineering Institute. He obtained the Candidate of Physical and Mathematical Sciences degree in 1985 from the Belarus State University. His research interests are in the scattering and diffraction of electromagnetic waves, mathematical modelling and CAD of antennas and microwave circuits.