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Abstract
Conditions for replacing a bi-isotropic half-space by an impedance surface are formulated. The most general bi-isotropic surface impedance is a dyadic containing an antisymmetric part, which is non-null for nonreciprocal media. To formulate the general radiation problem in front of the bi-isotropic surface, the exact image theory has been extended. The image theory is verified by known special cases and demonstrated by an example of a vertical electric dipole in front of the surface.