Coupling electronic seal

A coupling electronic seal, at least comprising:

• a plug bolt, which comprises a bolt pin and a circuit device, the bolt pin comprising an upper buckle and a receiving hole in which the circuit device is disposed, the receiving hole defining a hole body arranged in an axial direction and also defining a hole bottom in a bottom of the hole body to communicate inside and outside, the circuit device comprising a radio-frequency identification (RFID) chip and also comprising a main circuit and a radiation unit in electrical connection with the RFID chip, the main circuit comprising a lower contact point, the radiation unit being arranged to generate an effect of coupling feed with respect to the hole body of the bolt pin so as to make the bolt pin forming an upper monopole antenna of the circuit device;
• and
• a bolt seat, in which a lower monopole antenna is arranged and which is formed with a locking hole into which a lower portion of the bolt pin is insertable and is provided with a lower buckle for positioning of the upper buckle, so that the bolt pin is manipulatable to lock up with the bolt seat to control electrical connection between the lower monopole antenna and the lower contact point so as to activate the RFID chip, and the upper monopole antenna and the lower monopole antenna jointly form a dipole antenna.