In this work, at first the PIFA antenna for the triple band operation has been investigated and studied in detail. Further, the modified PIFA antenna design has been studied for BLE commutations of a wearable device. The proposed antenna was also compared with the meandered dipole antenna as a reference antenna which is widely used for BLE communication due to its compact size. While the reference antenna has a smaller size, it suffers a shift in frequency response when placed on the tissue. On the other hand, the proposed antenna shows little difference whether it is placed on a tissue or in...