A Novel Design Strategy for Small On-Metal UHF-RFID Tags with Long Read Range based on Complementary Split-Ring Resonator (CSRR)

摘要

A new strategy for designing small on-metal UHF-RFID tags providing long read range is presented in this paper. The proposed implementation consists of two parts: a complementary split-ring resonator (CSRR) antenna, which is intended to be directly cut out from a surface of the metallic container to be identified, and a very small feeding part containing the RFID chip, which may be implemented on a flexible dielectric with sticker material. As a proof of concept, a compact UHF-RFID tag based on a CSRR of radii 24.8 mm (λ₀/13) and a feeding network of size 29 mm × 11.3 mm (λ₀/11 × λ₀/29) is designed and fabricated. The measured read range is above 9 m within the entire USA UHF-RFID band, with a peak value of 15.5 m achieved at 920 MHz.