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Analysis and Design on Structure Parameters ofUHF Oppositely Directed Currents(PDF)

南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2018年01期
Page:
24-
Research Field:
电气与电子工程
Publishing date:

Info

Title:
Analysis and Design on Structure Parameters ofUHF Oppositely Directed Currents
Author(s):
Zhang Haiyong1; 2; Huang Cheng3; Ge Jinqun1; 2; Tang Wanchun1; 2; 4; Wang Yi5
(1.School of Physics Science and Technology,Nanjing Normal University,Nanjing 210023,China)(2.Jiangsu Key Laboratory on Opto-electronics Technology,Nanjing Normal University,Nanjing 210023,China)(3.School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)(4.Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,Nanjing 210023,China)(5.Key Laboratory of Radar Imaging and Microwave Photonics of Ministry of Education,Nanjing University ofAeronautics and Astronauts,Nanjing 211106,China)
Keywords:
RFID; UHF; ODCs; reader antenna; near-field
PACS:
TN911
DOI:
10.3969/j.issn.1672-1292.2018.01.003
Abstract:
In this paper,based on the oppositely directed currents(ODCs),a near field Radio Frequency Identification(RFID)reader antenna at ultra-high frequency(UHF)band is introduced. How structure parameters of antenna affects current distribution along the two elements are studied further. Once the length of the excited element and the operating frequency is given,the phase difference of currents along the two elements is determined by the length of parasitic element and the pitch between the two elements. To realize the ODCs,the length of the parasitic element and the distance between two elements should satisfy a corresponding relationship. With different requirements of the magnetic field distribution and the recognization areas,the length of the parasitic element with corresponding distance between two elements can be chosen flexibly. When the distance between the two elements is small,the length of parasitic element close to λ/2 is suitable. While when the distance is large,the length of parasitic element can be chosen among a large range. Finally,two examples are given to prove that the method introduced in this paper is reasonable.

References:

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