Dual band mono-chip HF-UHF tag antenna

This paper presents the feasibility of a single chip dual band HF-UHF RFID tag antenna. Some research focused on dual band HF and UHF RFID. Cost is a non negligible parameter in RFID tag antenna development. For this reason, multi-layered antennas and multi chip solutions are prohibited. The reason is that fabrication processes are too expensive to certify a low cost product. Tag exposed by Mayer and Scholtz exposed a multi-band antenna fed by a single chip. These performances in the HF bands are classic for tag antennas operating in this frequency band. However, performances in UHF RFID band suffer from degradations especially the maximum gain. The proposed solution is the combination of two separated antennas fed by a single chip operating in those two frequency bands. Substrate is epoxy 0.8 mm thick with a relative permittivity of 4.4 and tanδ = 0.02.