Geometrical Enhancement of Planar Loop Antennas for Inductive Near-Field Data Links

Author

Eteng, Akaa Agbaeze ; Rahim, Sharul Kamal Abdul ; Chee Yen Leow

Author_Institution

Wireless Commun. Center, Univ. Teknol. Malaysia, Skudai, Malaysia

Volume

14

fYear

2015

fDate

7/7/1905 12:00:00 AM

Firstpage

1762

Lastpage

1765

Abstract

The low Q-factor requirements of High-Frequency Radio Frequency Identification (HF-RFID) interrogator antennas constrain transmission performance when they are used in data links requiring similar terminal antennas. This letter presents a geometrical approach to enhance the transmission performance of planar loop antennas without a significant change to their standalone performance as HF-RFID interrogator antennas. The method distributes the turns of a modified planar square loop antenna to enhance the coupling level in a symmetric link, while limiting the change in Q-factor from a conventional HF-RFID interrogator antenna. Results from a presented test case show that the design method enables a 5.75% increase in peak transmission coefficient, and a 28.42% fractional bandwidth increase in a symmetric link, compared to a conventional design.

Keywords

inductive power transmission; loop antennas; near-field communication; planar antennas; radio links; radiofrequency identification; HF-RFID interrogator antenna; Q-factor; coupling level enhancement; geometrical enhancement; high-frequency radio frequency identification; inductive near field data link; modified planar square loop antenna; peak transmission coefficient; symmetric link; transmission performance enhancement; Antenna measurements; Antennas; Bandwidth; Capacitance; Coils; Couplings; Q-factor; Coupling coefficient; Q-factor; near-field; planar loop antenna;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2015.2423276

Filename

7086278