A planar inverted-F antenna (PIFA) to be attached to metal containers for an active RFID tagA planar inverted-F antenna (PIFA) to be attached to metal containers for an active RFID tagWonkyu Choi Nak-Seon Seong, Jong Myoun Kim, Cheolsig Pyo, Jongsuk Chae Electronics and Telecommunications Research Institute (ETRI) 161 Gajeong-dong, Yuseong-gu, Daejon, 305-600, Korea Tel: +82-42-860-4999, Fax: +82-42-860-5199, E-mail: wkchoiketri.re.krAbstract The main purpose of this paper is to present a planar inverted-F antenna to be attached to metal containers. The designed PIFA introduce various shapes of slots and meander line for size reduction and loop-shaped stubs for impedance matching. The impedance bandwidth of the PIFA is about 1.4% for VSWR