A CPW‐fed, circularly polarized (CP)antenna operating at 2.45 GHz ISM band is investigated for in‐body biotelemetry. Antenna has compact volume of 98mm³ (14 mm × 14 mm × 0.5 mm) and printed on RO 3010 substrate. By using inverted z‐shaped radiator with square ring‐shaped ground, wide impedance bandwidth of 450 MHz (2.25‐2.7 GHz).In addition, it also contributes to excite two orthogonal modes (TM01 and TM10) for CP generation and 3‐dB axial ratio bandwidth of 170 MHz (2.39‐2.56 GHz)is achieved. Results are simulated in muscle tissue, three‐layer rectangular and cylindrical phantom tissues and measured in pork tissue. Proposed structure demonstrates robust performance in heterogeneous bio‐environment. High gain of −15.96 dB confirms good radiation characteristics, low SAR value of 0.494 W/Kg and radiation efficiency of 2.83% make antenna suitable for low power in‐body bio‐telemetry.

中文翻译：

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CPW馈电的用于2.45 GHz ISM频段的圆极化植入式天线的设计和性能分析

研究了在2.45 GHz ISM频段上工作的CPW馈电的圆极化（CP）天线用于体内生物遥测技术。天线的体积为98mm ³（14毫米×14毫米×0.5毫米）并印刷在RO 3010基板上。通过使用具有方形环形接地的倒Z形辐射器，宽阻抗带宽为450 MHz（2.25-2.7 GHz），此外，它还有助于激发两种正交模式（TM01和TM10）以产生CP和产生3dB轴向比率带宽达到170 MHz（2.39-2.56 GHz）。在肌肉组织，三层矩形和圆柱体幻像组织中模拟结果，并在猪肉组织中进行测量。拟议的结构展示了在异构生物环境中的强大性能。-15.96 dB的高增益确认了良好的辐射特性，SAR值为0.494 W / Kg，辐射效率为2.83％，使该天线适合于低功率体内生物遥测。