Because the back glue of FPC antenna sticks to fingers or other substances, the secondary viscosity of the back glue will decrease; If the corners of the copper cloth are bent and attached to the surface of the shell with a small radius of curved surface, it is also easy to be warped by bending stress. Therefore, in the process of separating the adhesive tape from the PFC antenna, you should avoid bending the corners at both ends of the antenna or touching the adhesive tape at both ends of the antenna with your fingers, because these two ends are usually the places with the greatest bending stress, so you must keep the adhesive tape at both ends clean to avoid creases in the copper-clad areas at both ends.