Abstract
A novel wearable button antenna sensor is proposed for the concept of simultaneous wireless information and power transfer (SWIPT). This integrates two working modes for the transfer of power and information, respectively, and optimizes transfer efficiency. An omni-directional radiation pattern is achieved in the 3.5 GHz World Interoperability for Microwave Access (WiMAX) band to support on-body wireless communications, while a circularly polarized broadside radiation pattern is obtained in the 5 GHz wireless local area networks (WLAN) band to harvest power. The measured −10 dB return loss bandwidths are 4.0% (3.47–3.61 GHz) in the lower band, and 25.0% (4.51–5.80 GHz) in the higher band, respectively. An artificial magnetic conductor (AMC) structure with wideband characteristics is applied to obtain a low-profile design and to increase the stability of the antenna sensor. A high radiation efficiency of over 80% in the whole working band is observed. The specific absorption rate (SAR) of the proposed antenna sensor is below 0.509 W/kg at 3.55 GHz, and below 0.0532 W/kg at 5.5 GHz, respectively, which is much lower than the European standard threshold of 2 W/kg. All these characteristics make the designed antenna sensor suitable for on-body information transmission and off-body energy harvesting. The antenna sensor has been prototyped. Simulations and measurements agree well, proving the validity of the new concept.
Highlights
Wireless body area networks (WBAN) hold great promise for their rich potential in diverse areas, e.g., medical monitoring, physical training, navigation, wearable computing, etc. [1,2,3]
The proposed scenario is ideal for situations where off-body Tx antennas serving as power sources can be found, for example base stations or wireless fidelity (Wi-Fi) routers, operating at a different frequency than the frequency used for the information transfer
The proposed antenna is designed to operate in the 3.5 GHz WiMAX band, which is commonly used for on-body communication [32], and the 5 GHz wireless local area networks (WLAN) band, which serves various wireless applications, indicating an advantage for wireless power harvesting
Summary
Academic Editors: Patrick Van Torre, Slawomir J. This paper is an extended version of our paper published in Zhang, J.; Meng, J.; Li, W.; Yan, S.; Vandenbosch, G.A.E. A Metamaterial Inspired Button Antenna for Wireless Power and Data Transfer, 2020 IEEE 3rd. International Conference on Electronic Information and Communication Technology (ICEICT), Shenzhen, China, 13–15 November 2020, pp. International Conference on Electronic Information and Communication Technology (ICEICT), Shenzhen, China, 13–15 November 2020, pp. 341–343
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