Metal frame repeater antenna with partial slotted ground for bandwidth enhancement of wristband devices

摘要

This work proposes a metal frame wristband antenna for biomedical healthcare monitoring applications. The repeater antenna is supported by printed circuit board (PCB), surrounded by a metal frame with a planar size of 40 mm × 20 mm. By introducing a partial ground with two L-shaped cuts at the centre of the PCB, wideband performance can be achieved, ranging from 4.0 to 7.2 GHz in free space and 3.4 to 7.3 GHz on human body. For on-body application, it covers both the interference-free subset of the unlicensed 3.5-4.5 GHz ultra-wideband (UWB) and 5.725-5.875 GHz industrial scientific and medical (ISM) band. The UWB band is intended for near field communication with implanted device, while the ISM band is intended for far-field telemetry with monitoring station. Good agreement is obtained between measurements and simulations.