Patent ID: 8556185

Claim:
An RFID tag having capacitive load, comprising: an antenna unit, including two metal sheets and a conductive substrate, wherein the metal sheets are disposed at a corresponding position above the conductive substrate and electrically connected to the conductive substrate, and each metal sheet includes a first side, a second side corresponding to the first side and two third sides, the first sides of the metal sheets are close to and face each other, two third sides of each metal sheet are located between the first side and the second side; a capacitive load, electrically connected to the metal sheets and comprising two first extension sheets and two second extension sheets, wherein the first extension sheets are disposed on the same side of the metal sheets, each first extension sheet is connected to the third side at place near the first side, the second extension sheets and the first extension sheets are disposed on two corresponding sides of the metal sheets, and each second extension sheet is connected to the third side at a place near the first side; and an RFID device, feeding the antenna unit by electrically connecting to the metal sheets or coupling.