Ashyap Adel Y I, Elamin N I M, Dahlan S H, Abidin Z Z, See Chan Hwang, Majid H A, Al-Fadhali Najib, Mukred Jameel A A, Saleh Gameel, Esmail B A F
Center for Applied Electromagnetic (EMCenter), Faculty of Electrical and Electronic Engineering, Universiti Tun Hussein Onn Malaysia, (UTHM) Batu Pahat, Johor, Malaysia.
Faculty of Electronics and Electrical Engineering, International University of Africa, Khartoum, Sudan.
PLoS One. 2021 Jan 28;16(1):e0246057. doi: 10.1371/journal.pone.0246057. eCollection 2021.
A compact fabric antenna structure integrated with electromagnetic bandgap structures (EBGs) covering the desired frequency spectrum between 2.36 GHz and 2.40 GHz for Medical Body-Area Networks (MBANs), is introduced. The needs of flexible system applications, the antenna is preferably low-profile, compact, directive, and robust to the human body's loading effect have to be satisfied. The EBGs are attractive solutions for such requirements and provide efficient performance. In contrast to earlier documented EBG backed antenna designs, the proposed EBG behaved as shielding from the antenna to the human body, reduced the size, and acted as a radiator. The EBGs reduce the frequency detuning due to the human body and decrease the back radiation, improving the antenna efficiency. The proposed antenna system has an overall dimension of 46×46×2.4 mm3. The computed and experimental results achieved a gain of 7.2 dBi, a Front to Back Ratio (FBR) of 12.2 dB, and an efficiency of 74.8%, respectively. The Specific Absorption Rate (SAR) demonstrates a reduction of more than 95% compared to the antenna without EBGs. Moreover, the antenna performance robustness to human body loading and bending is also studied experimentally. Hence, the integrated antenna-EBG is a suitable candidate for many wearable applications, including healthcare devices and related applications.
介绍了一种紧凑的织物天线结构，该结构集成了电磁带隙结构（EBG），可覆盖医疗体域网（MBAN）所需的2.36 GHz至2.40 GHz频谱。由于灵活系统应用的需求，该天线最好是低剖面、紧凑、有方向性的，并且必须满足对人体负载效应具有鲁棒性的要求。EBG是满足此类要求的有吸引力的解决方案，并提供高效的性能。与早期文献记载的EBG背衬天线设计相比，所提出的EBG起到了从天线到人体的屏蔽作用，减小了尺寸，并充当了辐射器。EBG减少了由于人体引起的频率失谐，并减少了后向辐射，提高了天线效率。所提出的天线系统总体尺寸为46×46×2.4 mm3。计算结果和实验结果分别实现了7.2 dBi的增益、12.2 dB的前后比（FBR）和74.8%的效率。与没有EBG的天线相比，比吸收率（SAR）降低了95%以上。此外，还通过实验研究了天线对人体负载和弯曲的性能鲁棒性。因此，集成天线-EBG是许多可穿戴应用的合适候选方案，包括医疗保健设备及相关应用。
