Design of a PIFA antenna integrated in the watchstrap for smart watch application in the 2.4 GHz Bluetooth band

Abstract

[EN] This paper presents a Planar Inverted-F Antenna (PIFA) design for a smartwatch application, optimized to operate on the 2.4 GHz Bluetooth frequency band, on the proximity of the human forearm. The PIFA antenna is mounted on the watchstrap that is used as the antenna substrate. The antenna is fed in a singular way, since a coplanar wave-guide (CPW) transmission line is used to excite the antenna. The antenna is integrated in the watchstrap, curved over the phantom forearm and simulated along with the watchcase. A return loss of ¿20 dB is obtained at 2.4 GHz, and an efficiency of -5 dB, which represents a good efficiency taking into account the effect of the human forearm.This work has been supported by the Spanish Ministry of Science and Innovation (Ministerio Ciencia e Innovación) under project PID2019-107885GB-C32.Abdelhakim, A.; Cabedo Fabres, M.; Ferrando Bataller, M. (2021). Design of a PIFA antenna integrated in the watchstrap for smart watch application in the 2.4 GHz Bluetooth band. Íñigo Cuiñas Gómez. 1-3. http://hdl.handle.net/10251/1910631