A new compact ultrawideband (UWB) bioinspired antenna is presented in this work. The proposed antenna consists of a vine leaf (Vitis vinifera) shape as the radiating patch, defected ground structure (DGS), and a vertical rectangular slot (VRS) on the ground plane. The vine leaf shape is realized from a circular patch (initiator) in this work. The proposed antenna is built on an FR4 substrate with a dielectric constant of 4.4, a loss tangent of 0.02, and a thickness of 1.5 mm. The total dimension of the proposed bioinspired antenna is 35 × 27.6 mm². The proposed antenna has a fractional bandwidth of 115.43% (3.7 GHz–13.8 GHz) at 10 dB return loss, a radiation efficiency between 78% and 97%, a peak gain of 6.7 dB, and a stable radiation pattern. The contributions of this work to the existing literature are as follows: (i) the investigation of a vine leaf shape for UWB antenna application; (ii) the adaptation of the conventional monopole patch antenna design equation to determine the lower edge frequency (LEF) of an arbitrary shape monopole antenna; (iii) the presentation of a compact UWB antenna with high fractional bandwidth compared with recent works in the literature, and (iv) the use of FR4 substrate to achieve a peak radiation efficiency of 97% with a compact structure.

中文翻译：

---

紧凑型Vitis vinifera启发的超宽带天线，用于高速通信

这项工作提出了一种新的紧凑型超宽带（UWB）生物启发天线。拟议中的天线由藤叶（Vitis vinifera）形状的辐射贴片，有缺陷的地面结构（DGS）和接地平面上的垂直矩形缝隙（VRS）组成。藤叶形状是通过圆形贴片（引发剂）实现的。拟议中的天线建立在FR4基板上，该基板的介电常数为4.4，损耗角正切为0.02，厚度为1.5毫米。拟议中的生物启发天线的总尺寸为35×27.6 mm ²。拟议的天线在10 dB回波损耗下的分数带宽为115.43％（3.7 GHz–13.8 GHz），辐射效率在78％至97％之间，峰值增益为6.7 dB，并且辐射方向图稳定。这项工作对现有文献的贡献如下：（i）研究用于UWB天线的藤叶形状；（ii）调整传统的单极贴片天线设计公式，以确定任意形状的单极天线的下边缘频率（LEF）；（iii）与文献中的最新工作相比，提出了一种具有高分数带宽的紧凑型UWB天线；以及（iv）使用FR4基板，以紧凑的结构实现了97％的峰值辐射效率。