Design of a MIMO implantable antenna with ultra-miniaturized volume and reduced SAR

被引:0
|
作者
Bose, Moumita [1 ]
Singh, Ajit Prasad [2 ]
Chakraborty, Ujjal [1 ]
机构
[1] Natl Inst Technol, Dept Elect & Commun Engn, Silchar 788010, Assam, India
[2] BSNL, Durgapur 713201, West Bengal, India
关键词
biotelemetry; implantable MIMO (multiple input multiple output) antenna; ISM (industrial scientific and medical) band; miniaturized antenna; SYSTEM;
D O I
10.1515/freq-2024-0097
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper presents an ultra-miniaturized skin implantable Multiple Input Multiple Output (MIMO) antenna for biotelemetry in the Industrial, Scientific, and Medical (ISM) band (2.4-2.48 GHz). The two-element configuration exhibits a compact planar volume of 4.5 x 6.2 x 0.25 mm(3), with an edge-to-edge distance of 0.8 mm and a 75.85 % size reduction. Fabricated on a 0.25 mm thick Roger 10.2LM high permittivity substrate, the antenna achieves a Fractional Bandwidth (FBW) of 9.27 % and a realized gain of -28.2 dBi, with over 24.3 dB isolation across the entire band. Experimental results in multilayer animal tissue aligned well with simulations. Specific Absorption Rate (SAR) analysis at 1 W input power showed values of 848 W/kg (1-g) and 88.46 W/kg (10-g), yielding allowable input powers of 3.77 mW and 45.2 mW, respectively, adhering to international safety guidelines. The 2 x 2 element antenna demonstrated efficient communication over 7 m with a data rate of 78 Mbps/s. Multiple Input Multiple Output channel analysis revealed a Channel Capacity of 10.8 bps/Hz at a 20 dB SNR, nearly double that of an ideal Single Input Single Output system, making it suitable for high data rate skin-implantable applications.
引用
收藏
页码:91 / 99
页数:9
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