PIFA RFID Tag Antenna Design and Simulation using CST Microwave Studio

There has been an enormous upsurge in the popularity of RFID (Radio Frequency Identification) systems in recent years. The best example of this phenomenon is the contactless smart cards used as electronic tickets for public transport. Five years ago it was inconceivable that tens of millions of contactless tickets would now be in use. The possible fields of application for contactless identification systems have also multiplied recently. The passive RFID technology with no battery guarantees the lifelong functioning of the transponder and is also environmentally friendly. It works on the principle of Back-scattering and communication happens only when the Electromagnetic energy is being received from RFID reader to excite the tag [1]. RFID tag designed for UHF frequency working at 868 MHz is presented. This resonant frequency is chosen because it comes as Unlicensed European Frequency (Industrial Scientific Medical) band. A passive RFID tag is designed where adhesive copper is wrapped on both the sides (Front and Back side) of the PTFE (Polytetrafluoroethylene) substrate having relative permittivity r = 2.08 like a PIFA (Planar inverted F antenna) structure.