Rahman Md Mushfiqur, Islam Md Shabiul, Islam Mohammad Tariqul, Alam Touhidul
Faculty of Engineering, Multimedia University, Persiaran Multimedia, Cyberjaya 63100, Selangor, Malaysia.
Department of Electrical, Electronic & Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Materials (Basel). 2022 Jul 29;15(15):5247. doi: 10.3390/ma15155247.
In this paper, a compact wideband patch antenna comprising a modified electric-field-coupled resonator with parasitic elements is presented. The resonance at low frequency is achieved due to the electric field polarization along the split of the conventional LC (inductive-capacitive) structure. However, this antenna gives low bandwidth as well as low gain. Some evolutionary techniques are adopted to get a compact wideband antenna at 3GPP bands of 5G. The split width and the ground plane are modified to achieve enhanced bandwidth with good impedance matching, whereas the addition of the parasitic elements on both sides of the microstrip feed line enhances the gain with a slight reduction of bandwidth. The compact dimension of the proposed antenna is 0.26 λL × 0.26 λL × 0.017 λL, where λL is the free space wavelength at the lowest frequency. A prototype of the presented design is fabricated and measured. Measurement shows that the antenna has an operating bandwidth of 19.74% for |S11| < −10 dB where the gain of 1.15 dBi is realized. In addition, the radiation pattern is omnidirectional in the horizontal plane and dumbbell shaped in the elevation plane. The cross-polarization levels in both planes are less than −12 dB.
本文提出了一种紧凑的宽带贴片天线，它包含一个带有寄生元件的改进型电场耦合谐振器。低频处的谐振是由于电场沿传统LC（电感 - 电容）结构的缝隙极化而实现的。然而，这种天线带宽低且增益也低。采用了一些进化技术来获得适用于5G的3GPP频段的紧凑宽带天线。修改了缝隙宽度和接地平面以实现具有良好阻抗匹配的增强带宽，而在微带馈线两侧添加寄生元件则在带宽略有减小的情况下提高了增益。所提出天线的紧凑尺寸为0.26λL×0.26λL×0.017λL，其中λL是最低频率处的自由空间波长。制作并测量了所提出设计的原型。测量结果表明，该天线在|S11| < -10 dB时的工作带宽为19.74%，实现了1.15 dBi的增益。此外，其辐射方向图在水平面上是全向的，在仰角平面上是哑铃形的。两个平面中的交叉极化水平均小于-12 dB。
