Low profile flexible metal mountable UHF RFID tag antenna

This paper presents a low cost and a low profile flexible microstrip patch tag antenna for UHF RFID systems that can be metal mountable. The simple design that doesn´t imply using shorting pins, flexibility and small size (25mm × 50mm × 0.5mm) are a few of the advantages given by this design. The proposed antenna is simulated and the results obtained are compared with measurements performed with Agilent FieldFox N9912A VNA. At ETSI frequency band, the reading distance is up to 2.7m, which shows that the tag achieves good size/performance ratio for flexible metal mountable UHF RFID tags. The gain of the antenna is only -16.25dB, but in order to reach the mentioned reading distance is used an RFID chip having a wake-up power of -20.5dBm. The proposed tag can be easily mounted on metallic objects having various sizes and shapes.