  In this work, we introduce reconfigurable intelligent surfaces designed to
simultaneously perform reflection of single or multiple incident waves toward
the receiver or receivers and sensing the angles of arrival. We achieve
anomalous reflection with strongly suppressed parasitic scattering through an
in-situ optimization of either the currents flowing on array elements or the
far field in the receiver direction. The suppression of parasitic scattering
allows us to accurately and without additional measurements or computations
detect the angles of arrival of the illuminations through the spatial Fourier
transform of the optimized current distribution through the controllable
reactive loads. Therefore, unlike other recently proposed methods, our scheme
of integrated sensing and communication does not require any pre-computed data
sets and works for an arbitrary number of simultaneous illuminations. As a
proof of principle, we design and analyze with full-wave simulations several
reconfigurable intelligent surfaces consisting of an array of loaded wires
above a ground plane.
