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Title: Miniaturized Self-Resonant Micro Coil Array with A Floating Structure for Wireless Multi-Channel Transmission
Authors: Jun, Byoung Ok
Kim, Han-Joon 
Heo, Su Jin
Kim, Jonghyeun
Yang, Jae Hoon
Kim, Seunguk
Kim, Kyungtae
Jin, Woo-Cheol
Choi, Ji-Woong
Jang, Jae Eun
Keywords: high Q
impedance matching
micro antenna
wireless power transmission
Issue Date: 29-Oct-2021
Publisher: John Wiley and Sons Inc
Citation: Jun, Byoung Ok, Kim, Han-Joon, Heo, Su Jin, Kim, Jonghyeun, Yang, Jae Hoon, Kim, Seunguk, Kim, Kyungtae, Jin, Woo-Cheol, Choi, Ji-Woong, Jang, Jae Eun (2021-10-29). Miniaturized Self-Resonant Micro Coil Array with A Floating Structure for Wireless Multi-Channel Transmission. Advanced Science 8 (24) : 2102944. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Micro size antennas have significant merits due to the small size effect, enabling new device concepts. However, the low-quality factor (Q-factor), the large size of impedance matching components, and the poor selectivity of the multi-array design remain challenging issues. To solve these issues, a floating coil structure stacked on a loop micro-antenna is suggested. Various floating coil designs are prepared with appropriate matching conditions at specific target frequencies, using an easy fabrication process without the need for additional space. A simple one-loop antenna design shows a higher Q-factor than other, more complicated designs. The micro-sized loop antenna with the 80 µm trace width design exhibits the highest Q-factor, around 31 within 7 GHz. The 8 different floating coil designs result in high-frequency selectivity from 1 to 7 GHz. The highest selectivity contrast and WPT efficiency are above 7 and around 1%, respectively. Considering the size of the antenna, the efficiency is not low, mainly due to the good matching effect with the high Q-factor of the floating coil and the loop antenna. This micro-antenna array concept with high integration density can be applied for advanced wireless neural stimulation or in wireless pixel array concepts in flexible displays. © 2021 The Authors. Advanced Science published by Wiley-VCH GmbH
Source Title: Advanced Science
ISSN: 2198-3844
DOI: 10.1002/advs.202102944
Rights: Attribution 4.0 International
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