一种ISM频段半切共面波导可植入天线

提出一种以柔性材料为衬底的新型可植入天线，天线初始结构为对称状共面波导天线，对此天线在对称面进行切半得到半切共面波导天线。采用HFSS在单层人体模型中对半切天线进行设计与分析，仿真结果表明天线在不同人体组织中会产生频率偏移，但在皮肤、肌肉、小肠中均能覆盖工业、科学和医疗频段(ISM)。仿真结果还显示天线在改变衬底厚度的情况下仍具有宽的带宽。对天线进行加工，采用猪肉馅和果冻状模拟皮肤分别对天线进行测试，其|S11|<-10 dB的带宽分别为1.91~2.65 GHz与2.19~2.79 GHz，天线在2种环境中的测试带宽均能覆盖ISM频段，天线尺寸为6 mm×13.5 mm×24 mm。将天线与圆柱体共形，在肉馅中测试带宽为2.26~3.11 GHz，与目前已有天线相比，本文天线具有尺寸小、质量轻、带宽宽的特性，可应用于胶囊内视镜、无线心脏起搏器等可植入医疗器件中。

Abstract

A novel flexible implantable antenna is proposed. The antenna is a half cutting of a Coplanar Waveguide(CPW)-fed antenna with symmetric geometry. The half-cut antenna is optimized and analyzed in a single-layered body phantom by using HFSS. Simulation shows that there are frequency bandwidth shifts when the body phantom is filled with different tissues of muscle, small intestine, and stomach, respectively. The antenna bandwidth covers Industrial, Scientific, and Medical(ISM) band in the case of skin, muscle and small intestine. Simulation also shows that the antenna bandwidth has little change with the varying of substrate thickness. Measurements are done by arranging the antenna in meat mince and skin-mimicking gel. For the two cases, the measured |S11|<-10 dB bandwidth of the proposed antenna is 1.91-2.65 GHz and 2.19-2.79 GHz covering ISM band, respectively. The proposed antenna has a small size of 6 mm×13.5 mm×24 ?m. The proposed antenna is also investigated with a conformal structure adhering to a cylinder. The measured bandwidth of the conformal antenna is 2.26-3.11 GHz. Compared with published literatures, the antenna has advantages of low profile, light weight and wide bandwidth. The proposed antenna can be applied in wireless implantable medical devices, such as capsule endoscope, wireless cardiac pacemaker etc.

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丁宇星, 赵瞬民, 李山东, 宗卫华. 一种ISM频段半切共面波导可植入天线[J]. 太赫兹科学与电子信息学报, 2020, 18(2): 241. DING Yuxing, ZHAO Shunmin, LI Shandong, ZONG Weihua. A half-cut CPW-fed implantable antenna operating at ISM band[J]. Journal of terahertz science and electronic information technology, 2020, 18(2): 241.

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