Design of a compact UHF RFID tag antenna using an inductively coupled parasitic element

In this article, a compact tag antenna for UHF RFID systems is proposed.The proposed antenna consists of a T‐matching network, meandered dipole, and an inverted‐U shaped parasitic element. The tag antenna is miniaturized by utilizing inductive coupling between the meandered dipole and the parasitic element. The overall dimension of the proposed tag antenna is 17.96 × 35.6 mm2. It has a gain of 1.52 dBi and a maximum reading distance of 6.3 m at 915 MHz. The size of the tag antenna is about 33% of that of other RFID tag antennas, such as a meander line antenna and a coplanar inverted‐F antenna. In spite of its small size, the proposed tag antenna yields superior performance.