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 S11 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.

中文翻译：

---

用于全双工和 MIMO 同时无线信息和电力传输 (SWIPT) 的双极化可穿戴天线/整流天线


由于可穿戴天线的移动性和不可预测的以身体为中心的通信环境，双极化天线对于通信和能量收集至关重要。本文提出了一种用于可穿戴同步无线信息和电力传输 (SWIPT) 应用的双极化四端口纺织天线/整流天线。所提出的天线利用双端口进行离体通信以及从水平和垂直极化收集能量。无论有无人体，该天线都能在 2.4 GHz 附近的 S11 下保持 100 MHz 带宽，S11 低于 -10 dB，并且所有端口之间的小信号和大信号隔离度至少为 10 dB。该天线在两个通信端口的各种虚拟位置上保持 70-88% 的测量总效率和 8.4-9.6 dBi 增益。测得的共极化整流天线/天线端口之间的互耦合低于 -10 dB，正交极化端口之间的互耦合低于 -16 dB。通过侧射收集模式可实现超过 70% (±5%) 的高射频到直流峰值功率转换效率。基于所提出的天线性能，SWIPT 微带天线可用于全双工和 MIMO 应用，从而显着降低未来可穿戴和非可穿戴应用的无电池网络的复杂性。