Flexible 2.4 GHz Node for Body Area Networks With a Compact High-Gain Planar Antenna

A flexible 2.4 GHz wireless sensor node with a bespoke single-layer monopole antenna, tuned for on-body operation for wearable applications, is presented. Multiple antenna design approaches for tuning on-body antennas have been investigated. The proposed antennas patch and meandered, designed for operation in the insole, exhibit a simulated realized gain of −3.98 and −1.97 dB, respectively. The antennas were fabricated on a 25 μm flexible polyimide substrate, exhibiting up to 16% lower insertion losses at 20 GHz than FR4 PCBs. The integrated node incorporates a commercial Bluetooth low energy system-on-chip and exhibits 9 dB higher measured gain than commercial modules with reference antenna design. Moreover, through functional radio test, it was confirmed that the designed node passes Bluetooth transmitter certification tests.

[1]  Mahmoud Wagih,et al.  Analysis and design of low loss differential transmission line structures for high speed applications , 2017, 2017 IEEE 19th Electronics Packaging Technology Conference (EPTC).

[2]  Johanna Virkki,et al.  Flexible and Stretchable Brush-Painted Wearable Antenna on a Three-Dimensional (3-D) Printed Substrate , 2017, IEEE Antennas and Wireless Propagation Letters.

[3]  Carlos Mendes,et al.  A Dual-Mode Single-Band Wearable Microstrip Antenna for Body Area Networks , 2017, IEEE Antennas and Wireless Propagation Letters.

[4]  Vladimir Rajs,et al.  Implementation of wearable energy harvesting wireless sensor node using ink-jet printing on flexible substrate , 2016, 2016 5th Mediterranean Conference on Embedded Computing (MECO).

[5]  Atif Shamim,et al.  A WiFi tracking device printed directly on textile for wearable electronics applications , 2016, 2016 IEEE MTT-S International Microwave Symposium (IMS).

[6]  Dibin Zhu,et al.  Energy harvesting study on single and multilayer ferroelectret foams under compressive force , 2015, IEEE Transactions on Dielectrics and Electrical Insulation.

[7]  Russel Torah,et al.  A Smart Textile Based Facial EMG and EOG Computer Interface , 2014, IEEE Sensors Journal.

[8]  S. Beeby,et al.  Inkjet-Printed Microstrip Patch Antennas Realized on Textile for Wearable Applications , 2014, IEEE Antennas and Wireless Propagation Letters.

[9]  J. Vanfleteren,et al.  Design of an Implantable Slot Dipole Conformal Flexible Antenna for Biomedical Applications , 2011, IEEE Transactions on Antennas and Propagation.

[10]  Hendrik Rogier,et al.  Robust planar textile antenna for wireless body LANs operating in 2.45 GHz ISM band , 2006 .

[11]  Y. Rahmat-Samii,et al.  Implanted antennas inside a human body: simulations, designs, and characterizations , 2004, IEEE Transactions on Microwave Theory and Techniques.

[12]  Yi Li,et al.  A Flexible 2.45-GHz Power Harvesting Wristband With Net System Output From −24.3 dBm of RF Power , 2018, IEEE Transactions on Microwave Theory and Techniques.

[13]  Ruimin Xu,et al.  A Compact Parylene-Coated WLAN Flexible Antenna for Implantable Electronics , 2016, IEEE Antennas and Wireless Propagation Letters.

[14]  Satoshi Kiya,et al.  1~ 10 Gbps対応薄型 フレキシブルプリント回路 Thin Flexible Printed Circuit Supporting Transmission Rate from 1 to 10 Gbps 木谷 聡志* 森實 勝也 内田 淑文 , 2015 .