Loop antenna producing uniform horizontal magnetic fields over plane for HF RFID applications. Issue 17 (1st August 2014)

• Record Type: Journal Article
• Authors: Son, H.‐W.; Park, C.‐H.
• Is Part Of: Electronics letters. Volume 50:Issue 17(2014)
• Page Start: 1186
• Page End: 1188
• Publication Date: 2014-08-01
• Subjects: radiofrequency identification -- loop antennas -- HF antennas -- spiral antennas -- coils -- magnetic circuits; uniform horizontal magnetic field -- HF RFID application -- planar loop antenna -- two‐turn spiral coil -- magnetic coupling -- coil‐switching circuit -- interrogating signal operation -- high‐frequency radiofrequency identification reader antenna -- gaming chip monitoring; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2014.1676
• Languages: English
• ISSNs: 0013-5194

Abstract

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.