Electrically Small Antenna For RFID-Based Implantable Medical Sensor
Electrically Small Antenna For RFID-Based Implantable Medical Sensor
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DOI：
10.1109/jrfid.2023.3256407
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发表时间：
2023
影响因子：
3.1
通讯作者：
Andrew J. Mugisha;Amin Rigi;A. Tsiamis;S. Podilchak;S. Mitra
中科院分区：
文献类型：
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作者：
Andrew J. Mugisha;Amin Rigi;A. Tsiamis;S. Podilchak;S. Mitra
我们提出了一种sub-GHz，低轮廓电小天线（ESA），设计用于超高频RFID小型化无电池植入式无线医疗设备（iwmd）。定制ESA是线性极化偶极子，其拓扑结构利用曲线结构来使其外形小型化。此外，ESA利用一个后退的地平面来提高其增益性能，并在915 MHz的预期sub-GHz设计频率下实现谐振。欧空局的偶极子特性提供了180°双向射频信号传播的额外好处。欧空局的设计经过优化，集成了超高频RFID传感器芯片（SL900A）的足迹。通过将超高频射频识别芯片集成到ESA上，可以实现一个完整的无线无电池传感医疗设备，并具有集成天线。天线的外形系数为12.75美元× 12.25美元× 0.29美元mm3。制备了ESA的原型，并将其封装在聚二甲基硅氧烷（PDMS）中。原型ESA的输入反射系数（S11）和远场增益值在915 MHz的测量值分别为- 26.44 dB和- 18.88 dBi，与同行评审的工作相比，显示出明显更好的增益和效率性能。ESA可以用作各种无电池皮下植入物的天线，这些植入物带有连接的传感器（例如温度）或执行器（例如神经刺激器）。
We present a sub-GHz, low profile Electrically Small Antenna (ESA), designed for UHF RFID miniaturised battery free Implantable Wireless Medical Devices (IWMDs). The custom ESA is a linearly polarised dipole, and its topology leverages a meanderline structure to miniaturise its form factor. Furthermore, the ESA utilises a receded ground plane to improve its gain performance and achieve resonance, at the desired sub-GHz design frequency of 915 MHz. The ESA’s dipole characteristics provide an added benefit of 180° bi-directional RF signal propagation. The ESA’s design was optimised to integrate the footprint of a UHF RFID sensor chip (SL900A). By integrating the UHF RFID chip on the ESA, a complete wireless battery free sensory medical device, with an integrated antenna, can be realised. The antenna has a formfactor of $12.75\times 12.25\times 0.29$ mm3. A prototype of the proposed ESA was fabricated and encapsulated in Polydimethylsiloxane (PDMS). Measurements of the prototyped ESA’s input reflection coefficient (S11) and farfield gain values, at 915 MHz, were −26.44 dB and −18.88 dBi, respectively and demonstrated significantly better gain and efficiency performance, when compared to peer reviewed work. The ESA can be used as an antenna for various battery-free subcutaneous implants with a connected sensor (e.g., temperature) or actuator (e.g., neurostimulator).