In this paper, a novel multilayer microstrip implant antenna (MIA) design based on the Archimedean spiral (AS) radiator element is presented for dual-band biotelemetric health care monitoring system. The proposed AS-MIA design has a layered structure consists of the spiral antenna elements and superstrate, namely layer #1 , layer #2 and layer #3 , respectively. While achieving the dual-band multi-layer implantable antenna design, firstly, each of the radiating elements in the respective layers is designed to cover separately in the desired bands, that is, layer#1 and layer#2 operate in the ISM (Industrial, Scientific, and Medical 2.4–2.48 GHz) and MICS (Medical Implant Communication Services 402–405 MHz) bands, respectively. Subsequently the ultimate multilayered AS-MIA design is formed by combining the individually designed layers. The compact implantable antenna has a dimension of r = 5 mm radius and h = 3.81 mm height, owning the electrically size of 0.067 λ 0 and h = 0.051 λ 0, respectively, where λ 0 is free space wavelength at 402 MHz in MICS band. Since the AS-MIA is intended to be used in an intra-arm smart health system, the simulated radiation performances of the antenna in a created numerical arm phantom are presented in the article. Also note that numerical analysis of the implant antenna was carried out using CST MW studio simulator based on finite integral method. The prototype of the implantable antenna was fabricated using Rogers 3210 substrate with electrical permittivity of ε r = 10.2. In-vitro return loss measurements were realized in skin mimicking gels, suggested in the literature. It was observed that in vitro measurement and simulation results were quite compatible with each other, except for some discrepancies due to the manufacturing and material tolerances during the preparation of the prototype antenna and skin mimicking gels. The proposed AS-MIA offers a dual-band operation with 15 and 16% S 11 bandwidth at each band of 402 MHz and 2.4 GHz respectively where |S 11| ≤ 10 dB criterion along with 50-Ω system is considered. Also the proposed design can be a good candidate to be used in dual-band medical implant communication systems with its miniature size and reasonable radiation characteristics.

中文翻译：

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用于覆盖MICS和ISM频段的双频段臂内植入式生物遥测智能健康监护系统的多层阿基米德螺旋天线设计

在本文中，提出了一种基于阿基米德螺旋（AS）辐射器元件的新型多层微带植入天线（MIA）设计，用于双频生物遥测医疗保健监测系统。所提出的 AS-MIA 设计具有由螺旋天线元件和覆板组成的分层结构，即层 #1 ,层 #2 和层 #3 ， 分别。在实现双频段多层植入式天线设计的同时，首先将各层中的每个辐射单元设计成分别覆盖在所需频段，即层#1和层#2分别在 ISM（工业、科学和医疗 2.4–2.48 GHz）和 MICS（医疗植入物通信服务 402–405 MHz）频段运行。随后，通过组合单独设计的层，形成最终的多层 AS-MIA 设计。紧凑型植入式天线的尺寸为r= 5 毫米半径和H= 3.81 mm 高度，电气尺寸为 0.067λ 0和H= 0.051λ 0，分别在哪里λ 0是 MICS 波段中 402 MHz 的自由空间波长。由于 AS-MIA 旨在用于手臂内智能健康系统，因此本文介绍了在创建的数字手臂模型中天线的模拟辐射性能。另请注意，植入天线的数值分析是使用基于有限积分法的 CST MW 工作室模拟器进行的。植入式天线的原型是使用 Rogers 3210 基板制造的，其介电常数为ε r = 10.2。体外文献中建议，在皮肤模拟凝胶中实现了回波损耗测量。据观察，体外除了在原型天线和皮肤模拟凝胶的制备过程中由于制造和材料公差造成的一些差异之外，测量和模拟结果彼此非常兼容。拟议的 AS-MIA 提供双频操作，分别为 15% 和 16%小号 11每个频段的带宽分别为 402 MHz 和 2.4 GHz小号 11| 考虑 ≤ 10 dB 标准以及 50-Ω 系统。此外，所提出的设计具有微型尺寸和合理的辐射特性，可以很好地用于双频医疗植入物通信系统。