<![CDATA[Advances in wearable technology and the Internet of Things (IoT) have driven the need for antennas that are flexible, lightweight, and capable of optimal performance at 915 MHz for LoRa communication. This study aims to design and simulate a flexible, wearable microstrip antenna using a silicone rubber substrate with a CPW-fed coplanar waveguide (CPW) technique at 915 MHz. The novelty of this research lies in the application of the CPW-fed technique to a flexible microstrip antenna made of silicone rubber, optimized for 915 MHz LoRa communication while considering radiation characteristics and Specific Absorption Rate (SAR) values. The research methods included initial dimension calculations, design, simulation, and optimization using CST Studio Suite 2025, as well as SAR analysis using a chest body phantom. Simulation results showed that the antenna resonated at 915 MHz with an S11 value of −26.10 dB, a gain of 4.27 dBi, and a bandwidth of 6 MHz. The antenna exhibits a directional radiation pattern, with surface current distribution concentrated on the patch and feedline, and a maximum SAR value of 0.691 W/kg at a distance of 0 mm, which remains below the ICNIRP limit of 2 W/kg. Based on the simulation results, the antenna meets LoRa communication specifications and electromagnetic exposure safety requirements. This research is still limited to the simulation stage; therefore, fabrication and experimental testing are needed to validate the antenna’s performance under actual usage conditions.]]>
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