HF RFID Reader Antenna Producing Uniform Horizontal Magnetic Fields Over a Plane

Author

Ji-Haeng Cho ; Hae-Won Son

Author_Institution

2nd R&D Inst., Agency for Defense Dev., Daejeon, South Korea

Volume

14

fYear

2015

fDate

2015

Firstpage

16

Lastpage

19

Abstract

A planar loop antenna producing uniform horizontal magnetic fields over its plane is presented. The antenna consists of a pair of two-turn spiral coils that are excited alternately. To avoid the bad effect of magnetic coupling between the coils, one of them is made up of a series combination of two spiral coils wound in opposite directions, and a good isolation of more than 32 dB is achieved. The antenna is suitable for a high-frequency radio frequency identification reader antenna that is installed under a chip tray to monitor gaming chips in electronic table game systems.

Keywords

HF antennas; coils; entertainment; magnetic fields; planar antennas; radiofrequency identification; HF RFID reader antenna; chip tray; electronic table game systems; gaming chips monitoring; high-frequency radio frequency identification reader antenna; magnetic coupling; planar loop antenna; two-turn spiral coils; uniform horizontal magnetic fields; Antenna measurements; Antennas; Coils; Couplings; Radiofrequency identification; Spirals; Casino application; loop antenna; magnetic coupling; radio frequency identification (RFID); reader antenna;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2014.2354395

Filename

6891164