This letter presents a design of very compact asymmetric dual L‐strip fed split‐ring shaped electromagnetic bandgap (EBG)‐based textile antenna for wireless body area networks (WBAN) applications, operating at frequency 2.45 GHz. The antenna radiator is composed of 2 × 1 array of EBG cells printed on same side of the substrate with partial ground plane to form a compact EBG surface, excited with a 50 Ω inverted L‐strip feed line. The partial ground plane with EBG cells is used to miniaturize the proposed antenna of size 40 × 20 × 0.3 mm³. The proposed compact asymmetric dual L‐strip fed wearable antenna (DLSWA) with EBG structure is fabricated on denim (jeans) substrate having dielectric constant (ɛ_r) 1.7 and thickness of 0.3 mm. The design of proposed antenna is optimized for Industrial, Scientific, and Medical (ISM) band (2.4‐2.48 GHz)through various parametric variations with simulated impedance bandwidth (BW) of 12.2% (2.3‐2.6 GHz) for reflection coefficient |S₁₁| ≤ −10 dB and also exhibits stable radiation patterns with simulated peak realized gain of almost 3.5 dBi in the entire operational frequency band. The performance of proposed wearable antenna on human body is also studied and observed low specific absorption rate (SAR) value of 0.6 W/kg over 10 g of human tissues. The proposed compact asymmetric DLSWA is designed, fabricated, and tested. The simulated results of designed antenna are verified and validated with measured results which show good agreement for all radiation characteristics of proposed antenna for WBAN applications.

中文翻译：

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用于WBAN应用的紧凑型印刷非对称双L条纹馈电开口环形EBG纺织天线

这封信介绍了一种非常紧凑的非对称双L条纹馈电开口环形电磁带隙（EBG）纺织天线的设计，用于无线人体局域网（WBAN）应用，工作频率为2.45 GHz。天线辐射器由2×1的EBG电池阵列组成，该EBG电池印刷在基板的同一侧，并具有部分接地平面，以形成紧凑的EBG表面，并由50Ω倒L形条纹馈线激励。使用带有EBG电池的部分接地平面可将建议的尺寸为40×20×0.3 mm ^3的天线小型化。所提出的紧凑的非对称双大号-strip馈送穿戴天线（DLSWA）与EBG结构上牛仔布制造（牛仔裤）具有介电常数基片（ɛ _ř）1.7和0.3毫米的厚度。拟议天线的设计通过各种参数变化针对工业，科学和医学（ISM）频段（2.4-2.48 GHz）进行了优化，其反射系数| S _11的模拟阻抗带宽（BW）为12.2％（2.3-2.6 GHz）。| ≤-10 dB，并且还表现出稳定的辐射方向图，在整个工作频带中模拟的峰值实现增益几乎为3.5 dBi。还研究了建议的可穿戴天线在人体上的性能，并在10 g的人体组织上观察到0.6 W / kg的低比吸收率（SAR）值。拟议的紧凑型不对称DLSWA被设计，制造和测试。对设计天线的仿真结果进行了验证和验证，其测量结果与拟议的WBAN天线的所有辐射特性吻合良好。