Patent ID: 9727765
Date: 2017-08-08
CPC Classifications: G06K,H01L,H01Q,H04B,H05K

Claim:
1. An RFID system comprising: a reader/writer including an antenna; and an RFID tag including an antenna attached to an article; wherein transmission and reception of a high-frequency signal is performed between the antenna of the reader/writer and the antenna of the RFID tag; the antenna of the reader/writer is defined by a planar-shaped loop antenna including a loop conductor disposed in a loop plane; the antenna of the RFID tag is defined by a three-dimensional-shaped coil antenna including a plurality of coil conductors having coil surfaces; a conductor width of the loop conductor in the planar-shaped loop antenna is greater than a conductor width of each of the plurality of coil conductors in the three-dimensional-shaped coil antenna; an outside dimension of the loop conductor in the planar-shaped loop antenna is greater than an outside dimension of the plurality of coil conductors in the three-dimensional-shaped coil antenna, such that in the three-dimensional-shaped coil antenna, larger magnetic fields are generated in a direction perpendicular or substantially perpendicular to the coil surfaces than in a direction parallel or substantially parallel to the coil surfaces, and in the planar-shaped loop antenna larger magnetic fields are generated in a direction parallel or substantially parallel to the loop plane than in a direction perpendicular or substantially perpendicular to the loop plane; and the plurality of coil conductors include portions that are stacked and wound so as to have a three-dimensional shape.