W. E. I. Liu, Z. Ning Chen, E. N. Kai Yin, Y. Zeng and X. Qing, "An Inductive Perforated Ground Backed Thin Electrically Large Zero-Phase-Shift Line Loop Antenna for UHF Near-Field RFID Reader," 2018 IEEE International Conference on Service Operations and Logistics, and Informatics (SOLI), Singapore, 2018, pp. 123-126. doi: 10.1109/SOLI.2018.8476763
Abstract:
An electrically large zero-phase-shift line (ZPSL) segmented loop antenna backed by an inductive perforated ground plane is proposed for ultra-high frequency near-field RFID systems. The ZPSL segmented loop configuration enables a uniform distribution of magnetic field over an electrically large interrogation zone, while the backed inductive perforated ground plane is introduced to realize a stronger magnetic field for a longer reading range, even with a thinner overall profile as compared with a metal ground plane backed counterpart.