Patent ID: 7222798

Claim:
A contactless identification device comprising: an integrated circuit; a conducting wire or strip as an electromagnetic sensor; and a capacitive element connected in parallel with said conducting wire or strip; wherein the conducting wire or strip is a single-turn flat conducting wire and the capacitive element is a flat coplanar capacitor; wherein the conducting wire or strip and the capacitive element are lying on a common single layer of the device; wherein the capacitive element is surrounded by the conducting wire or strip; wherein at least one of at least a portion of said conducting wire or strip and at least a portion of said capacitive element is shaped as a space-filling curve; wherein the space-filling curve is defined as a curve composed by at least ten connected straight segments; wherein said segments are smaller than a tenth of the operating free-space wave length and are spatially arranged so that none of said adjacent and connected segments form another longer straight segment.