access icon free Dual-band RFID tag antenna based on the Hilbert-curve fractal for HF and UHF applications

© The Institution of Engineering and Technology
Received 07/05/2015, Accepted 23/08/2015, Published 01/03/2016

A novel single-radiator card-type tag is proposed which is constructed using a series Hilbert-curve loop and matched stub for high frequency (HF)/ultra high frequency (UHF) dual-band radio frequency identification (RFID) positioning applications. This is achieved by merging the series Hilbert-curve for implementing the HF coil antenna, and square loop structure for implementing the UHF antenna to form a single RFID tag radiator. The RFID tag has directivity of 1.75 dBi at 25 MHz, 2.65 dBi at 785 MHz, 2.82 MHz at 835 MHz and 2.75 dBi at 925 MHz. The tag exhibits circular polarisation with −3 dB axial-ratio bandwidth of 14, 480, 605 and 455 MHz at 25, 785, 835 and 925 MHz, respectively. The radiation characteristics of the RFID tag is quasi-omnidirectional in its two orthogonal planes. Impedance matching circuits for the HF/UHF dual-band RFID tag are designed for optimal power transfer with the microchip. The resulting dual-band tag is highly compact in size and possesses good overall performance which makes it suitable for diverse applications.

Inspec keywords: electromagnetic wave polarisation; HF antennas; VHF antennas; impedance matching; omnidirectional antennas; multifrequency antennas; UHF antennas; radiofrequency identification

Other keywords: HF coil antenna; circular polarisation; Hilbert curve fractal; impedance matching circuits; single radiator card type tag; optimal power transfer; orthogonal planes; dual-band radio frequency identification positioning; microchip; series Hilbert-curve loop; dual band RFID tag antenna; quasiomnidirectional radiation characteristics; bandwidth 2.82 MHz to 925 MHz; UHF applications; square loop structure; matched stub

Subjects: RFID systems; Electromagnetic wave propagation; Single antennas

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