Development of a Wearable IoT-Optimized Textile Antenna with Low Specific Absorption Rate in Three Frequency Bands

This paper introduces a textile antenna designed for wearable Internet-of-Things(IoT) use, employing a slotted patch configuration. The antenna is constructed on standard textile material and operates within crucial IoT frequency bands, encompassing the 1.9 GHz, 3.5 GHz and 5.8 GHz band of Global System for Mobile Communications (GSM), 5G-sub-6-GHz, and industrial, scientific, and medical radio bands, respectively. Antenna offers -10 dB impedance bandwidths corresponding to 7.34, 3.4, and 5.03% with respect to resonating frequencies while having radiation efficiencies of 64.2, 76.2, and 75.9 %, respectively. This antenna have a high gain of 5.04, 6.35, and 6.9 dBi at first, second and third resonance, respectively. Most notably, it maintains relatively low specific absorption rates (SAR) of 0.7 W/kg, 1.04 W/kg, and 0.532 W/kg when averaged across 1 gram of tissue. These features make the proposed textile antenna well-suited for wearable IoT applications.