HF Passive Tags, are generally working in 13.56 MHz, has been offered in the form of PVC cards, wristbands and standard label formats. Since HF passive tags does not contain a power source, they operate via induction by the RF field of the HF readers. Thanks to their near field range and large memory capabilities, HF Passive Tags are generally used in applications having access control, payment and loyalty tracking scenarios. With the widespread of NFC technology, HF Tags conform to this technology and nowadays can easily be detected by the smart mobile phones.