Overlapping Coil Structures Formed By Folding For Compact RFID Tags

An RFID tag comprising:

• a substrate including opposing first and second surfaces each having first and second portions defined by a fold line therebetween;
• an antenna associated with the first surface of the substrate and defined by a conductive trace comprising
• a first coil associated with the first portion of the first surface and having a first number of turns, and
• a second coil associated with the second portion of the first surface and having a second number of turns;
• and
• an RFID chip electrically coupled to the antenna, wherein the substrate is folded at the fold line so as to orient the first portion of the first surface into facing relationship with the second portion of the first surface, with at least a portion of the first coil overlapping at least a portion of the second coil such that the antenna has a number of turns equal to the sum of the first number of turns and the second number of turns.