Exact geometrical optics scattering from a tri-sector isorefractive wedge structure

A structure made of three 120/spl deg/-wedges isorefractive to one another and with a common edge is considered. The incident field consists of three plane waves incident on the edge along the bisectors of the wedge regions. The conditions under which the structure is invisible to the incident field are determined. An extension is made to a honeycomb structure.