Design of internally fed dual-band repeater antenna for human-health monitoring application

This paper presents the design of an internally fed dual-band dual-polarized repeater antenna covering 2.4 GHz Bluetooth or Industrial, Scientific, and Medical (ISM) band and 3.5 GHz 5G cellular communication for wearable application. By exciting an unsymmetrical slot structure loaded at two sides of the feeding port located between an external metal frame and an internal ground, we can easily tune the antenna for dual-band operation. More importantly, this internal ground can be designed as an empty metallic cavity housing electronic components, therefore minimizing the electromagnetic interference brought by them. This proposed type of antennas can be widely applicable in smartwatch, smartband and swallowable capsule intended for human health monitoring.