... production processes.RUIFU prelam could incorporate pre-winding coil or ultrasonic embedding copper antenna, even FLIP chip etching antenna upon ... .6mm, 0.5mmAntennaHF: AL Etching,Pre-winding Copper coil, Altrasonic Embeding; LF: Pre-winding Copper Coli, AL Etching; UHF: AL EtchingBondingLF: ... Among them, the cards made by Flip will have very flat surface, and very thinner thickness; for ultrasonic, it ...