A new probe has been developed which allows the field pattern due to a transmitting antenna to be accurately measured very close to a conductor or a dielectric. It can be used, for example, to infer the far field of an antenna, or a passive scatterer, from measurements in the near field.
Wave fields contain interesting three-dimensional structure, which can often be best understood as based on the spatial arrangement of singularities (special loci). This approach is relevant on scales ranging from that of geometrical optics, where the singularities are caustics (classified by catastrophe theory), down to the ...
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