Miniaturized Self‐Resonant Micro Coil Array with A Floating Structure for Wireless Multi‐Channel Transmission

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...

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Bibliographic Details
Published in:	Advanced science Vol. 8; no. 24; pp. e2102944 - n/a
Main 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
Format:	Journal Article
Language:	English
Published:	Germany John Wiley & Sons, Inc 01-12-2021 John Wiley and Sons Inc Wiley
Subjects:	Antennas Biocompatibility Electrodes high Q impedance matching micro antenna Plating Signal processing wireless power transmission impedance matching high Q wireless power transmission micro antenna
Online Access:	Get full text
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Summary:	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. Hybrid array structures of micro‐antenna and various floating coil structures are studied for wireless applications with high selectivity because the hybrid structure shows the appropriate matching condition at specific target frequencies. The micro‐antenna array concept with high integration density can be applied for advanced wireless neural stimulation, micro‐robot, or wireless pixel array concepts in flexible displays.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2198-3844 2198-3844
DOI:	10.1002/advs.202102944