Design of Wideband Tag Antenna for Ultra-High-Frequency Radio Frequency Identification System Using Modified T-Match and Meander-Line Techniques

摘要

Ultra-high-frequency radio frequency identification is widely used in logistics and inventory management due to its compact size, distant readability, and speedy response. Nevertheless, current readability distance of the existing ultra-high-frequency radio frequency identification does not satisfy the requirements of certain applications, giving rise to research works to improve upon the present technology. Therefore, the focus of this article is to develop a compact wideband passive tag antenna operable in the entire ultra-high-frequency radio frequency identification band of 860-960 MHz. The impedance bandwidth, i.e., |S-11| (dB), of the proposed tag antenna was set at less than -10 dB. The modified T-match and meander-line techniques were utilized to enhance the impedance of the tag antenna so that it is not only compatible with an integrated circuit chip (NXP G2XL; NXP Semiconductors, 2012) but also operable in the ultra-high-frequency radio frequency identification international standard bandwidth. The proposed tag antenna was fabricated on an FR-4 substrate with a thickness of 0.25 mm and cross-section dimension of 11 mm (W) x 88 mm (L). The radiation pattern of the antenna is omnidirectional with linear polarization and maximum gain of 2.05 dBi.