Abstract
Owing to the mobility of a wearable antenna and the unpredictable body-centric communications environment, dual-polarization antennas are essential for both communications and energy harvesting. This paper presents a dual-polarized four-port textile antenna/rectenna for wearable simultaneous wireless information and power transfer (SWIPT) applications. The proposed antenna utilizes dual ports for both off-body communication and energy harvesting from horizontal and vertical polarizations. The antenna maintains a 100 MHz bandwidth with an S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> under -10 dB around 2.4 GHz in the presence and absence of the human body, and at least 10 dB small-signal and large-signal isolation between all ports. The antenna maintains a 70-88% measured total efficiency and 8.4-9.6 dBi gain for various on-phantom positions across both communication ports. The measured mutual coupling is under -10 dB between co-polarized rectenna/antenna ports, and under -16 dB between orthogonally-polarized ports. A high RF to DC peak power conversion efficiency of over 70% (±5%) is achieved with a broadside harvesting pattern. Based on the proposed antenna's performance, SWIPT microstrip antennas can be adopted for both full-duplex and MIMO applications, significantly reducing the complexity of future battery-free networks for both wearable and non-wearable applications.
Highlights
S IMULTANEOUS wireless information and power transfer (SWIPT) has attracted significant research interest for sustainable Internet of Things (IoT) networks [1]
SWIPT can be C, both the Wireless power transmission (WPT) and WIT ports will be able to discriminate regarded as a multi-antenna system should the wireless infor- between the incident polarizations, allowing up-link and downmation transfer (WIT) and the wireless power transmission link users to be selectively-powered by the base-station [1]
A dual-polarized four-port fully-textile antenna has been proposed for SWIPT applications in Multi-In Multi-Out (MIMO) and fullduplex BANs, the first antenna designed for simultaneously harvesting power and communicating over two orthogonal polarizations
Summary
S IMULTANEOUS wireless information and power transfer (SWIPT) has attracted significant research interest for sustainable Internet of Things (IoT) networks [1]. Dual-port textile-based microstrip patch antennas have been proposed with high-isolation for full-duplex applications [13]. In [18], antenna rectifier co-design was utilized to implement a sub-1 GHz rectenna within a 2.4 GHz off-body textile patch for dual-band/mode SWIPT. Both implementations, [24] and [18], maximize the isolation by designing the antenna and rectenna ports with orthogonal polarizations. SWIPT can be C, both the WPT and WIT ports will be able to discriminate regarded as a multi-antenna system should the wireless infor- between the incident polarizations, allowing up-link and downmation transfer (WIT) and the wireless power transmission link users to be selectively-powered by the base-station [1]. The selfinterference cancellation front-end proposed in [30] for fullduplex communication does not add to the power consumption of the transceiver while offering over 50 dB TX/RX isolation, making it highly suitable for WPT and RFEH systems
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