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Re∞ectionless cylindrical concentrators have been designed up to now in an initially empty core space by applying form- invariant, spatial coordinate transformations of Maxwell's equations. We show that the re∞ectionless cylindrical concentrators in initially homogeneous and isotropic dielectric core media allow an enhanced concentration of the incident fleld. Designs of more complex re∞ectionless concentrators in initially inhomogeneous dielectric media represented by empty or dielectric-fllled circular containers are also presented. The transformation equations are given explicitly, and the flelds are expressed analytically. The functionality of these devices is illustrated by several examples.

progress in electromagnetics research

ELECTROMAGNETIC CYLINDRICAL CONCENTRATORS IN INITIALLY HOMOGENEOUS OR INHOMOGENEOUS DIELECTRIC CORE MEDIA DESIGNED BY THE COORDINATE TRANSFORMATION METHOD