Yara A Kamel, Hesham A Mohamed, Hala ELsadek, Hadia M ELhennawy
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The main features of the designed transmitting antenna are its simplicity, the wide-band characteristics, which preserve the detuning effect caused by environmental heterogeneity, and the CP property at both operational ISM bands. Moreover, for introducing an electrically small antenna footprint with proper performance, the implantable antenna is designed with an entire size of 25.4 (5× 5 × 1.016) [Formula: see text]. This antenna is designed and dissected in a homogeneous skin model (HSM) as well as a three-layer phantom. On the other hand, the wide-band receiving antenna is designed on flexible material for patients' comfort with a compact size of 134.6 ([Formula: see text]) [Formula: see text]. In addition, the implantable antenna performance is evaluated in a chicken slab as well as a saline solution, while the on-body antenna is placed on the chicken slab to measure its reflection coefficient. The measured impedance BWs of the implantable antenna are 13.04 % and 33.2 % in the chicken slab while 19.5% and 25.2 % in the saline solution at the two ISM bands, respectively. While, the measured impedance BWs of the on-body antenna are 24% and 50.4 % at two operating ISM frequencies. 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引用次数: 0
摘要
本文研究了两种用于植入式通信的天线,一种是深埋在有损耗介质中的具有圆极化(CP)优点的宽带低轮廓发射天线,另一种是放置在人体组织中的具有线性极化(LP)优点的宽带低轮廓接收天线。第一根天线可植入人体内部,用于感知、监测和传输各种生命体征,第二根天线作为附近的接收端。这些天线工作在2.4-2.4835 GHz和5.725-5.875 GHz的ISM (industrial, science, and medical)频段。设计的发射天线的主要特点是结构简单,宽频带特性,保留了由环境非均质性引起的失谐效应,以及两个操作ISM频段的CP特性。此外,为了引入具有适当性能的电小天线占地面积,可植入天线的整体尺寸设计为25.4 (5× 5× 1.016)[公式:见文]。该天线采用均匀皮肤模型(HSM)和三层模体进行设计和解剖。另一方面,宽带接收天线采用柔性材料设计,尺寸紧凑,为134.6([公式:见文])[公式:见文]。此外,在鸡平板和生理盐水溶液中评估了植入式天线的性能,同时将体上天线放置在鸡平板上测量其反射系数。在两个ISM波段上,植入天线在鸡平板上的阻抗bw分别为13.04%和33.2%,在盐水溶液中分别为19.5%和25.2%。在两个ISM工作频率下,体上天线的阻抗bw分别为24%和50.4%。最后,对测得的两天线间传输系数进行了计算。
RF communication between dual band implantable and on body antennas for biotelemetry application.
This paper investigates two antennas for implantable communication, which are a wide-band, low-profile transmitting antenna with a circular polarization (CP) merit immersed in a lossy medium and a corresponding wide-band, low-profile receiving antenna with a linear polarization (LP) merit placed on human tissue. The first antenna is implantable inside a human body for sensing, monitoring, and transmitting various vital signs, while the second antenna acts as a nearby receiving end. These antennas work in the 2.4-2.4835 GHz and 5.725-5.875 GHz industrial, scientific, and medical (ISM) bands. The main features of the designed transmitting antenna are its simplicity, the wide-band characteristics, which preserve the detuning effect caused by environmental heterogeneity, and the CP property at both operational ISM bands. Moreover, for introducing an electrically small antenna footprint with proper performance, the implantable antenna is designed with an entire size of 25.4 (5× 5 × 1.016) [Formula: see text]. This antenna is designed and dissected in a homogeneous skin model (HSM) as well as a three-layer phantom. On the other hand, the wide-band receiving antenna is designed on flexible material for patients' comfort with a compact size of 134.6 ([Formula: see text]) [Formula: see text]. In addition, the implantable antenna performance is evaluated in a chicken slab as well as a saline solution, while the on-body antenna is placed on the chicken slab to measure its reflection coefficient. The measured impedance BWs of the implantable antenna are 13.04 % and 33.2 % in the chicken slab while 19.5% and 25.2 % in the saline solution at the two ISM bands, respectively. While, the measured impedance BWs of the on-body antenna are 24% and 50.4 % at two operating ISM frequencies. Finally, the measured transmission coefficient between the two antennas is evaluated.
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