The type of Air Gap Structure uses two single-sided flex circuits and applies pre-punched dynamic area adhesive in between to achieve high-flexible demand. It must pass through the process of CNC and plated through hole in advance to conduct the circuits on both sides then cover each single-sided flex circuits with a protective layer after the circuits were formed. It is able to design circuits on both sides and carry out plug-in and out, contact, lamination, and soldering.