Patent ID: 9105979
Filing Date: 2015-08-11
Classification: B82Y,G02B,H01Q

Abstract:
1. An apparatus, comprising: a stack of one or more layers having controllable reflective properties provided by metamaterial elements therein; and a controller configured to dynamically adjust the controllable reflective properties of the one or more layers to present an effective reflective surface at varying positions or orientations in the stack as a function of time to introduce a time-varying path delay d (t) in a reflected free space electromagnetic wave relative to an incident free space electromagnetic wave; wherein the time-varying path delay d (t) is a substantially linear function of time (φ(t)≈ αt) so that the reflected free space electromagnetic wave has its frequency f′ shifted relative to a frequency f of the incident electromagnetic wave by an amount δf (=α/2π).