Coupling-based turns distribution for planar spiral coil antennas in near field magnetic induction links

• Main Authors: Eteng, Akaa Agbaeze, Abdul Rahim, Sharul Kamal, Chee, Yen Leow, Beng, Wah Chew
• Format: Article
• Language: English
• Published: Penerbit UTM Press 2015
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utm.my/id/eprint/58180/1/SharulKamal2015_CouplingBasedTurnsDistributionForPlanarSpiralCoil.pdf; http://eprints.utm.my/id/eprint/58180/; http://dx.doi.org/10.11113/jt.v77.6282
• Institution: Universiti Teknologi Malaysia

This paper describes a numerical study of a coupling-based turn-distribution approach to achieving good transmission performance in near field magnetic inductive links using low Q-factor coil antennas. Coil antenna turns are distributed to match an upper reference coupling level, leading to a stronger axial H-field, with a low margin of Q-factor increment from a baseline minimum. Numerical results demonstrate improved transmission efficiency performance relative to a minimal Q-factor coil antenna when the modified antenna is employed in a symmetric bi-directional inductive link. This approach to increasing transmission efficiency indicates prospects for extending the utility of low Q-factor HF-RFID interrogator antennas to include wireless power delivery applications.