Title :
UHF RFID impedance matching: T-match-dipole tag design on the highway
Author :
Jingtian Xi ; Hailong Zhu
Author_Institution :
Hong Kong R&D Centre for Logistics & Supply Chain Manage. Enabling Technol., Hong Kong, China
Abstract :
Impedance matching is a constant topic in the RFID community. However, it still heavily depends on the trial-and-error approach, even for the popular T-match. In this paper, T-match-dipole tag designthe dynamics behind the impedance matching of T-match-dipole tags are studied systematically. Based on the inductance-based model stemmed from the transmission line model, the bandwidth characteristics of diverse matching scenarios are discussed. Closed-form expressions of the maximum bandwidths and the relevant conditions are provided. In particular, a special doubletuning scenario called the degenerated double-tuning is explored for the first time. Guided by the conditions of the maximum bandwidths, efficient design approaches are proposed for the embedded T-match dipole. Results of multiple design examples demonstrate the usefulness of the impedance matching theory and the design approaches presented.
Keywords :
radiofrequency identification; RFID community; T-match-dipole tag design; UHF RFID impedance matching; closed form expressions; double tuning; embedded T-match dipole; inductance based model; transmission line model; trial-and-error approach; Bandwidth; Dipole antennas; Geometry; Impedance; Integrated circuit modeling; Power transmission lines; Radiofrequency identification; T-match; UHF RFID; impedance matching; inductance-based model; tag antenna; transmission line model;
Conference_Titel :
RFID (RFID), 2015 IEEE International Conference on
Conference_Location :
San Diego, CA
DOI :
10.1109/RFID.2015.7113077