Ultra-thin electromagnetic bandgap backed fractal geometry-based antenna for 24 GHz ISM band WBAN
Ultra-thin electromagnetic bandgap backed fractal geometry-based antenna for 24 GHz ISM band WBAN
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DOI：
10.1049/mia2.12321
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发表时间：
2023-01-27
影响因子：
1.7
通讯作者：
Gomes, Nathan J. J.
中科院分区：
文献类型：
--
作者：
Ali, Mubasher;Ullah, Irfan;Gomes, Nathan J. J.
提出了一种用于WBAN应用的24ghz ISM频段的紧凑型超薄电磁带隙（EBG）背馈天线。所提出的天线具有基于Koch分形几何的领结槽，总体尺寸为0.91 lambda 0 ${\lambda }_{\mathbf{0}}$ x 0.84 lambda 0 ${\lambda }_{0}$ x 0.01 lambda 0 ${\lambda }_{\mathbf{0}}$，并由5 x 5单元0.01 lambda 0 ${\lambda }_{\mathbf{0}}$厚EBG结构支撑；它是在柔性Rogers 5880衬底上制造的（厚度= 0.127 mm，介电常数ε r ${\varepsilon }_{r}$ = 2.2, tan δ = 0.0009）。与先前发布的K波段原型天线相比，我们提出的分形天线具有更紧凑和超薄的外形因素。低轮廓，无通孔的EBG单元胞结构尺寸为0.254 lambda 0 ${\lambda }_{\mathbf{0}}$ x 0.254 lambda 0 ${\lambda }_{\mathbf{0}}$，同时具有人工磁性导体（AMC）和EBG特性。在毫米尺度上制造它很简单。从结构弯曲和不弯曲情况下的对体反射系数和自由空间辐射方向图两方面研究了设计的性能参数。EBG结构使天线的前瓣增益提高了2.3 dB，后瓣辐射降低了12.6 dB，比吸收率（SAR [1 g]）从50.9 W/kg降低到50.9 W/kg
A compact, ultra-thin electromagnetic bandgap (EBG) backed antenna is presented for the 24 GHz ISM band for WBAN applications. The proposed antenna has Koch fractal geometry-based bow-tie slots, designed with an overall dimension of 0.91 lambda 0 ${\lambda }_{\mathbf{0}}$ x 0.84 lambda 0 ${\lambda }_{0}$ x 0.01 lambda 0 ${\lambda }_{\mathbf{0}}$ and backed by a 5 x 5 element 0.01 lambda 0 ${\lambda }_{\mathbf{0}}$ thick EBG structure; it is fabricated on a flexible Rogers 5880 substrate (thickness = 0.127 mm and dielectric constant epsilon r ${\varepsilon }_{r}$ = 2.2, tan delta = 0.0009). In comparison to the previously published K band prototype antennas, our presented fractal antenna has a more compact and ultra-thin form factor. The low profile, via-less EBG unit cell structure with dimensions of 0.254 lambda 0 ${\lambda }_{\mathbf{0}}$ x 0.254 lambda 0 ${\lambda }_{\mathbf{0}}$, possesses both Artificial Magnetic Conductor (AMC) and EBG characteristics. It is straightforward to fabricate at a millimeter-scale. The performance parameters of the design are investigated in terms of on-body reflection coefficient and free-space radiation patterns with and without structural bending. The EBG structure enhances the antenna's front-lobe gain by 2.3 dB, decreases back-lobe radiation by 12.6 dB and decreases the specific absorption rate (SAR [1 g]) from >50.9 W/kg to