A 6 mm long and 1.5 wide antenna is evaporated on a surface of a 7 mm long and 2.4 mm wide inlet film, and a slit is formed in the antenna. An IC chip is mounted on the antenna over the slit like a bridge to configure an inlet. The inlet is wound on a 7 mm long shaft having a diameter of 0.8 mm in its longitudinal direction. The shaft with the inlet wound thereon is inserted in an inside of an 11 mm long outer coating cover having a diameter of 1 mm, the cover being made of resin. The cover with the shaft and the inlet therein is passed through a heater cylinder for fusion by heat, thereby providing the coating to the RFID tag. This results in a small bioimplant RFID tag.
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