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This paper concerns a modal method for designing metal-plate lens structures. The method is based on coordinate transformation and the use of Maxwell's equations written under the covariant form. Furthermore the lens is considered as a medium with discontinuities described by Dirac Delta functions. We illustrate the method by showing the formation of the focus for various incident waves.
The basic principle of a new FIDT condensed node is reviewed. Comparison with the well known Yee's algorithm is presented. Examples of applications with emphasis on open space scattering problems are shown. Different absorbing boundary algorithms are implemented and compared.
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