School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
College of Information Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
Sensors (Basel). 2020 Dec 8;20(24):7002. doi: 10.3390/s20247002.
This paper presents a novel broadband monopole antenna that was equipped with a bottom semicircle ground structure, a parasitic patch, a T-shaped slot, s transmission line, a parasitic strip, heart-shaped slices and a coplanar waveguide (CPW). The simulation results revealed that the proposed design had a relatively high return loss, a wide bandwidth and high efficiency. A prototype of the proposed antenna with an overall size of 0.94 λ × 0.94 λ × 0.02 λ (λ is the free-space wavelength) was fabricated and measured. The measurement results showed that the prototype had a bandwidth of 4.02 GHz (4.69-8.71 GHz) and a relative bandwidth of 60%. Besides, the maximum gain was 3.31 dBi and the maximum efficiency was 91.1% in the range of 5 to 8.5 GHz. Furthermore, it was found that the prototype almost achieved omnidirectional radiation. Its operating frequency band covered those of industrial scientific medical (ISM) (5.725-5.850 GHz), the radio frequency identification (RFID) (5.8 GHz) and the wireless local area network (WLAN) (5.15-5.25 GHz and 5.725-5.825 GHz).
本文提出了一种新型的宽带单极天线，该天线配备了一个底部半圆形接地结构、一个寄生贴片、一个 T 形槽、一个传输线、一个寄生条、心形切片和共面波导 (CPW)。仿真结果表明，所提出的设计具有较高的回波损耗、较宽的带宽和较高的效率。制造并测量了一个具有 0.94λ×0.94λ×0.02λ（λ 为自由空间波长）总尺寸的原型天线。测量结果表明，原型天线的带宽为 4.02GHz（4.69-8.71GHz），相对带宽为 60%。此外，在 5 至 8.5GHz 的范围内，最大增益为 3.31dBi，最大效率为 91.1%。此外，发现原型天线几乎实现了全向辐射。其工作频段涵盖了工业科学医疗（ISM）（5.725-5.850GHz）、射频识别（RFID）（5.8GHz）和无线局域网（WLAN）（5.15-5.25GHz 和 5.725-5.825GHz）。
