This paper presents the design and development of a dual-band and dual-polarized two-port multiple-input-multiple-output (MIMO) antenna for mid-band 5G (3.4–3.6 GHz), and C-band (4–8 GHz) applications. The antenna design is very simple and it mainly consists of a circular-shaped single split-ring resonator on the top side of the substrate which is coupled with the microstrip line feed line. The bottom side is comprised of a rectangular-shaped defected ground structure. Due to this dual-band response is obtained and the first band shows linear polarization and the second band provides circular polarization. The entire dimensions of the intended two-port MIMO antenna are 46 mm × 21 mm × 1.6 mm. The antenna measured results offer a wider impedance bandwidth (IBW) of 20.22% and 44.07% for the two bands centered at 3.54 GHz and 6.33 GHz respectively. Also, the proposed MIMO antenna shows minimum isolation of 15 dB for the two frequency bands with a smaller edge-to-edge spacing of 4 mm (0.04λ₀) between the two antenna elements. Moreover, the second band provides an axial ratio bandwidth of 3.97% centered at 6.78 GHz. The antenna shows excellent IBW, good isolation between the single antenna elements without the use of any decoupling mechanism, better antenna gain, and improved envelope correlation coefficient by maintaining smaller antenna size compared to similar types of existing two-port MIMO antennas in literature.

本文介绍了用于中频带5G（3.4–3.6 GHz）和C频带（4–8）的双频带和双极化两端口多输入多输出（MIMO）天线的设计和开发。 GHz）应用。天线的设计非常简单，它主要由位于基板顶侧的圆形单开口环谐振器组成，该谐振器与微带线馈线耦合。底侧由矩形的缺陷接地结构组成。由于获得了该双频带响应，因此第一频带显示了线性极化，而第二频带提供了圆极化。预期的两端口MIMO天线的整体尺寸为46 mm×21 mm×1.6 mm。天线测量结果为分别位于3.54 GHz和6.33 GHz的两个频带提供了20.22％和44.07％的更宽的阻抗带宽（IBW）。₀）在两个天线元件之间。此外，第二频带提供了以6.78 GHz为中心的3.97％的轴向比率带宽。与文献中类似的现有两端口MIMO天线相比，通过保持较小的天线尺寸，该天线表现出了出色的IBW，在不使用任何解耦机制的情况下在单个天线元件之间实现了良好的隔离，更好的天线增益以及改善的包络相关系数。