The dual-band tag antenna designed for HF-RFID (13.56MHz) and UHF-RFID (920-925 MHz) applications along Thailand standard is proposed. The overall dimension of the tag antenna has the size of a credit card in order to implement the RFID for the highway tracking and tolls systems. The tag antenna is designed on FR-4 substrate with 0.3 mm thickness. To achieve the dual band operation, the designed tag antenna structure is based on the loop (spiral coil) and the meander-line structure with T-matching technique for HF-RFID and UHF-RFID technologies, respectively.
