A Flexible Wideband Spiral Antenna using Polydimethylsiloxane Substrate for Wearable Applications

This work presents a flexible wideband antenna made of transparent polydimethylsiloxane (PDMS) substrate. The proposed antenna’s overall size is $28 \times 24 \times l.5 mm3$. The proposed wideband antenna operates from 3. 25GHz to 15GHz and has good gain and an omnidirectional radiation pattern. The Specific Absorption Rate (SAR) values are also calculated when it is fed with a power input of 50mW and the values are found to be below the recommended FCC limit. It has been examined at a few different frequencies 3. 6GHz, 4.2GHz, 4.8GHz, 5. 2GHz, 5.8 GHz, 6.2 GHz, 7.5 GHz, 8.4 GHz, 9.2 GHz, and 10GHz. The maximum achieved gain is 6.56 dB at 3.6 GHz. The performance characteristics of the proposed antenna without bending, while bending and when placed on human tissue are compared.