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(a) Photograph of 15-bit encoders with the indicated ID codes; (b) corresponding envelope functions. The inclusions have a length of 18 mm and a width of 0.4 mm, whereas their separation is 3 mm (providing an encoder period of 3.4 mm). The estimated thickness of the 3D-printed substrate is 0.2 mm, and the estimated thickness of the dielectric inclusions is 0.2 mm. Reprinted with permission from [25]. Copyright 2020 IEEE.
