Tran-Tuan Anh, Hoang-Thi-Phuong Thao, Vu-Van Yem, Tran-Huy Hung
Faculty of Electrical and Electronic Engineering, PHENIKAA University, Yen Nghia, Ha Dong, Hanoi, Vietnam.
Faculty of Electronics and Telecommunications, Electric Power University, Hanoi, Vietnam.
PLoS One. 2025 May 23;20(5):e0321602. doi: 10.1371/journal.pone.0321602. eCollection 2025.
This paper presents a four-port multiple-input multiple-output (MIMO) antenna with compact size, wideband operation, and high isolation characteristics. The wideband performance is achieved by generating two adjacent resonances, which are respectively produced by a half-wavelength slot and a metasurface (MS). Four MIMO elements are arranged in a 2 [Formula: see text] 2 configuration with zero spacing between the MIMO elements to achieve the compact size feature. For mutual coupling reduction, the adjacent elements are positioned so that their polarizations are perpendicular. Meanwhile, the coupling between the opposite elements is suppressed with the aid of shorting pins. The final design has compact size of 1.08 [Formula: see text] [Formula: see text] 0.89 [Formula: see text] [Formula: see text] 0.07 [Formula: see text] and center-to-center element spacing of 0.35 [Formula: see text], where [Formula: see text] is the free-space wavelength at 5.2 GHz. The measured operating bandwidth, in which the reflection and transmission coefficients are respectively smaller than -10 and -20 dB, is from 4.9 to 5.8 GHz. Across this band, the proposed design has peak broadside gain of 4.5 dBi and good MIMO diversity performance. Compared to other related works, the proposed design has advantages of wideband, high isolation, while keeping a compact size characteristic.
本文提出了一种具有紧凑尺寸、宽带工作和高隔离特性的四端口多输入多输出(MIMO)天线。通过产生两个相邻的谐振来实现宽带性能,这两个谐振分别由一个半波长缝隙和一个超表面(MS)产生。四个MIMO单元以2×2的配置排列,MIMO单元之间的间距为零,以实现紧凑尺寸的特性。为了降低互耦,相邻单元的位置设置为其极化相互垂直。同时,借助短路引脚抑制相对单元之间的耦合。最终设计的紧凑尺寸为1.08λ×0.89λ×0.07λ,单元中心间距为0.35λ,其中λ是5.2 GHz时的自由空间波长。测量得到的工作带宽(反射系数和传输系数分别小于-10 dB和-20 dB)为4.9至5.8 GHz。在该频段内,所提出的设计具有4.5 dBi的峰值宽边增益和良好的MIMO分集性能。与其他相关工作相比,所提出的设计具有宽带、高隔离的优点,同时保持了紧凑尺寸的特性。