Abstract
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.
Highlights
Ultrawideband antenna has attracted the attention of microwave engineers since the declaration of the Federal Communication Commission (FCC) to make it available for commercial use. is antenna readily finds application in radar, military, medical, and mobile communication
Authors in [4, 7] proposed a bioinspired UWB antenna based on Igna Marginata leaf. e antenna proposed in [7] has dimension of 40 × 30 mm2 and is built on an FR4 substrate of height 1.5 mm
Antenna Design Procedure e radiating patch of the proposed antenna is based on vine leaf shape on an epoxy glass (FR4) substrate of a dielectric constant of 4.4, a loss tangent of 0.02, and a height of 1.5 mm with a defected ground structure (DGS) and a vertical rectangular (VR) slot as the ground plane
Summary
Ultrawideband antenna has attracted the attention of microwave engineers since the declaration of the Federal Communication Commission (FCC) to make it available for commercial use. is antenna readily finds application in radar, military, medical, and mobile communication. In [11], the authors investigated Tulip flower shape having a dimension 56.25 × 35.7 mm for UWB application, and impedance bandwidth of 9.45 GHz was achieved. Erefore, in the quest for increased UWB bandwidth and enhanced efficiency, this work investigates vine leaf (Vitis vinifera) shape as a bioinspired structure for UWB wireless applications. 2. Antenna Design Procedure e radiating patch of the proposed antenna is based on vine leaf shape on an epoxy glass (FR4) substrate of a dielectric constant of 4.4, a loss tangent of 0.02, and a height of 1.5 mm with a defected ground structure (DGS) and a vertical rectangular (VR) slot as the ground plane. The maximum edge length of the VBi-UWBA radiating patch from its center is 10 mm Figure 1: A typical vine leaf shape.
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