A wrist wearable dual port dual band stacked patch antenna for wireless information and power transmission

A novel antenna with orthogonally polarized dual ports one of which is dual band is proposed. The dual band performance is achieved by the upper rectangular patch loaded with a U-slot at its edge. It has resonances at 2.41GHz and 2.48GHz covering the advertisement channels of Bluetooth LE standard. It is stacked with an orthogonally polarized rectangular patch which resonates at 2.45GHz. The antenna aims to have good isolation between the ports so that single band port can be used for Wireless Power Transfer (WPT) while the dual band port is used for Communications. The antenna is designed to be used with health monitoring sensors to create a robust and energy efficient wearable which uses WPT as its only source of energy. Therefore it is tested on an arm phantom and the choice of polarization is found to be critical for the WPT range and the performance of the wearable.