Title :
Loop antenna producing uniform horizontal magnetic fields over plane for HF RFID applications
Author :
Son, Hae-Won ; Park, C.-H.
Author_Institution :
Div. of Electron. & Inf. Eng., Chonbuk Nat. Univ., Jeonju, South Korea
Abstract :
A planar loop antenna producing uniform magnetic fields horizontal to its plane is presented. The antenna consists of a pair of two-turn spiral coils that are sequentially excited. To prevent undesirable magnetic coupling between the coils, a novel coil-switching circuit is proposed, which is automatically operated using the interrogating signal from the reader. The antenna is suitable for a high-frequency radio frequency identification reader antenna installed under a chip tray to monitor gaming chips in a casino.
Keywords :
HF antennas; coils; loop antennas; magnetic circuits; radiofrequency identification; spiral antennas; HF RFID application; coil-switching circuit; gaming chip monitoring; high-frequency radiofrequency identification reader antenna; interrogating signal operation; magnetic coupling; planar loop antenna; two-turn spiral coil; uniform horizontal magnetic field;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2014.1676
