High-Resolution Synthesized Magnetic Field Focusing for RF Barcode Applications

A prototype of a high-resolution synthesized magnetic field focusing (SMF) system for a possible application to radio frequency (RF) barcodes is proposed in this paper. It was recently found that coordinated control of array coil currents makes it possible to focus magnetic field, which is requisite...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2018-01, Vol.65 (1), p.597-607
Main Authors: Min-Woo Kim, Kim, Ji H., Yeonje Cho, Minsik Kim, Choi, Bo H., Kwyro Lee, Joungho Kim, Gyu-Hyeong Cho, Rim, Chun T.
Format: Article
Language:English
Subjects:
Antenna arrays
Bar codes
Coils
Contractors
Converters
Focusing
High resolution
Logic gates
Magnetic field focusing
Magnetic fields
Magnetic flux
magnetic induction tomography (MIT)
Medical imaging
Prototypes
Radio frequency
Switching converters
Synthesis
synthesized magnetic field focusing (SMF)
wireless power transfer (WPT)
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Summary:A prototype of a high-resolution synthesized magnetic field focusing (SMF) system for a possible application to radio frequency (RF) barcodes is proposed in this paper. It was recently found that coordinated control of array coil currents makes it possible to focus magnetic field, which is requisite for medical imaging, wireless power, and RF identification. Different from conventional phased array RF antennas, SMF is independent of frequency, which is quite promising for various applications. In this paper, an array of rectangular air coils is proposed, and various implementation issues, such as accurate control of coil currents and compact RF barcode design, are newly suggested. A prototype of an SMF system composed of a transmitter (Tx), an RF barcode, and a receiver (Rx) was implemented at below 1 MHz operating frequency. The Tx includes modularized control drivers, full-bridge switching converters, and 16 arrayed air coils, where the RF barcodes proposed in this paper include a self-resonating circuit at 20 mm × 20 mm and a tunable resonating circuit at 15 mm × 15 mm. In this way, a 5 mm resolution at a distance of 20 mm was achieved for the Tx arrayed air coils with spacing of 5 mm, which is about four times sharper magnetic field focusing compared to a nonfocusing conventional coil. Furthermore, the proposed SMF system allows the designed 5-bit RF barcode array to be fully distinguishable at a 15 mm distance.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2017.2714147