Multi-band antenna structure

The embodiment of the utility model discloses a multi-band antenna structure which comprises a lock box body, a box cover is fixedly connected to one side of the lock box body, an NFC antenna, a 4G antenna and a Bluetooth antenna are sequentially fixed to the inner side wall of the box cover, a GPS module and an RFID antenna are fixed to the inner wall of the box cover, a control panel is fixed to the inner portion of the box cover, and the control panel is connected with the box cover. The NFC antenna, the 4G antenna, the Bluetooth antenna, the GPS module and the RFID antenna are electrically connected with the control panel through wires, a lock ring is inserted into the outer wall of the top of the lock box body, a sliding plate is slidably connected into the lock box body, a cam rotating plate is arranged on one side of the sliding plate, a rotary knob is rotatably connected into the lock box body, and the cam rotating plate is arranged on the other side of the sliding plate. One end of a connecting shaft