Abstract: Retrodirectivity and invisibility are two opposite concepts in the radar context. The former looks for an evident identification, while the latter aims to remain unnoticed. Here, we present a new structure based on inverted conical surfaces to provide both effects depending on the conical aperture value: 90° for retrodirective applications and 120° for invisible and Wi-Fi/Li-Fi applications. Results of the study carried out to confirm the behavior of the two structures are also presented, including measurements to compare performance with commercial prototypes in the case of retrodirectivity.

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