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Research on U-shaped tuning stub RFID tag on different objects

Published online by Cambridge University Press:  27 August 2014

Chien-Hung Chen ,
Yi-Fang Lin  and
Hua-Ming Chen
Chien-Hung Chen*
Affiliation:
Department of Avionics Engineering, R.O.C. Air Force Academy, Kaohsiung, Taiwan. Phone: +1 352 300 8802
Yi-Fang Lin
Affiliation:
Institute of Photonics and Communications, National Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan.
Hua-Ming Chen
Affiliation:
Institute of Photonics and Communications, National Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan.
*
Corresponding author: C. H. Chen Email: francischen@ieee.org
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Abstract

A new ultra-high frequency radio frequency identification (RFID) tag antenna, which is comprised a U-shaped tuning stub and a dipole radiator for different permittivity surfaces is investigated, fabricated, and measured. For a conjugate match to the NXP G2XM chip impedance of 29–j137 at 915 MHz, a dipole tag antenna with U-shaped stubconnected to dipole arms was designed. Simple size adjustments of the U-shaped tuning stub and dipole radiator of the antenna allow for easy control of the antenna resistance and inductive reactance, from which the chip impedance requirement may be readily satisfied. The read range of the prototype antenna attached on a different permittivity surfaces (εr = 1–4) can reach more than 4.5 m, which has been tested for an RFID reader with 4.0 W of effective isotropic radiated power. The antenna structure consists of two dipole load bars and two loop electrically connected. The design offers more choice of freedom to tune the input impedance of the proposed antenna. Measurement data are presented which are in good agreement with simulation results. The design is suitable for mounting on all kinds of objects. The fabricated tag sensitivity of −3 dBm, read range of 7 m on the x–z and y–z planes, and the measured orientation radiation patterns were obtained in the desired frequency band.

Keywords

Dipole antennaDifferent permittivity surfacesOrientation radiation patternU-shaped tuning stub
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 7 , Issue 6 , December 2015 , pp. 629 - 636
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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