Frequency selective surfaces for tracking, labeling and identification

A system for unique labeling and identification, comprising

• a plurality of identification (ID) tags each comprising an array of frequency selective surfaces (FSS), wherein the FSS comprise conductive traces, the FSS are configured to produce a unique tag response caused by one or more parameters when in the presence of and responsive to a wireless signal, and the one or more parameters include shapes of the conductive traces of the FSS;
• one or more receivers configured to receive the unique tag responses of at least some of the plurality of ID tags;
• one or more processors configured to identify the plurality of ID tags based on the received unique tag responses;
• and
• a non-transitory computer readable storage medium storing reference values which permit matching individual ones of the plurality of ID tags to the unique tag responses which the plurality of ID tags respectively produce in the presence of the wireless signal,
• wherein the one or more processors are further configured to
• perform convolutions of the received unique tag responses with masks to calculate coordinate values, and
• match the calculated coordinate values with the reference values stored in the non-transitory computer readable storage medium to identify respective ID tags.