Flexible Sensing Antenna for Overbending Detection in Intelligent Packaging Applications

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作   者：

Kamalesh Tripathy;  Akshat Yati;  Mitradip Bhattacharjee; 

作者机构：

India;  Bhopal;  Indian Institute of Science Education and Research (IISER) Bhopal;  i-Lab;  Department of Electrical Engineering and Computer Science; 

关键词：

Deformation;  Resonant frequency;  Bending;  Sensors;  Antennas;  Substrates;  Intelligent sensors; 

期刊名称：

IEEE Sensors Letters

i s s n：

年卷期：

2023 年 7 卷 12 期

页   码：

1-4

页   码：

摘   要：

The recent demand for flexible sensor integration in the world of Internet of Things (IoT) and artificial intelligence paves the way for various novel wireless sensing technologies. In this direction, flexible antenna-based sensors are the most preferable due to many advantages like easy fabrication, compact size, enabling wireless integration, cost-effectiveness, etc. Polyethylene terephthalate (PET) is widely used as a substrate for flexible sensors as it is mechanically and chemically stable with different sensing materials. In this letter, a silver ink-based printed patch antenna on a PET substrate is presented to detect higher bending deformation. Without bending, the antenna has a resonant frequency of ～2.5 GHz with high return loss, i.e., cannot transmit signal effectively. As the flexible antenna undergoes more bending deformation, i.e., at a bending radius R = 1.5 cm, the return loss has a value less than ?10 dB at 2.5 GHz. With further increase in bending deformation, i.e., R = 1 cm, the resonant frequency shifts to 1.57 GHz with a return loss of ?27 dB. The fabricated flexible antenna can be used for monitoring and signaling possible danger to the packaging of sensitive materials and structural health of any targeted equipment or any structure going through repeated loading and unloading of bending deformation.