| CPC H01Q 15/148 (2013.01) [H04B 7/04013 (2023.05)] | 20 Claims |
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1. A reconfigurable intelligent surface (RIS) comprising:
a unit-cell that includes:
a first layer composed of a conductive material and structured according to a sub-wavelength reflective pattern that reflects an impinging wave at a predetermined phase and that steers the reflected impinging wave toward an intended receiver;
a second layer composed of a first dielectric substrate material; and
a middle layer positioned between the first layer and the second layer and composed of a second material having tunable dielectric properties, wherein tuning a dielectric constant of the second material modifies the predetermined phase of reflection of the impinging wave,
wherein the unit-cell of the RIS is one of a plurality of unit-cells in which middle layers of a pair of adjacent unit-cells are connected to each other by a connecting trace at the middle layers, and
wherein the sub-wavelength reflective pattern is an inverted L-shaped pattern.
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