Beam steering device and electronic device including the same

A beam steering device comprising:

• an antenna structure comprising an antenna layer disposed comprising a first plurality of nano-structures disposed in a first region and a second plurality of nano-structures disposed in a second region, different from the first region and surrounding the first region, wherein a distribution of at least one of sizes and shapes of the first plurality of nano-structures is smaller than a distribution of at least one of sizes and shapes of the second plurality of nano-structures;
• an auxiliary structure, disposed under the antenna layer and comprising a first region, disposed in a location corresponding to a location of the first region of the antenna layer, and a second region, disposed in a location corresponding to a location of the second region of the antenna layer;
• wherein the first region of the auxiliary structure comprises:
• a second layer disposed under the antenna layer and comprising a plurality of refractive-index variable regions, each having a refractive index that is controlled by a voltage applied thereto;
• a first layer disposed under the second layer and comprising a plurality of reflection regions;
• and
• a driving circuit layer disposed under the first layer and comprising a plurality of circuit units respectively configured to control voltages applied to the plurality of refractive-index variable regions;
• and
• wherein the second region of the auxiliary structure omits at least one of:
• any refractive-index variable regions,
• any reflection regions, and
• any circuit units.