Comparison among microstrip patch MIMO antennas.

This paper presents a multiple-input-multiple-output (MIMO) antenna array with low-profile and flexible characteristics. Multiple microstrip patches are arranged in the E-plane configuration and decoupled by shorted quarter-wavelength stubs. The antenna has a small element spacing of 0.032 λ, where λ is a free-space wavelength at the center frequency. To demonstrate the feasibility of the proposed concept, a 1 × 4 MIMO array prototype is fabricated. The measured results on the fabricated prototype demonstrate that the MIMO antenna has good operation features at 4.8 GHz with a reflection coefficient of less than –10 dB and an isolation of better than 20 dB. Besides, good radiation patterns and broadside gain of around 4.5 dBi are also attained. The antenna also works in the bending mode and has the capability of extending to large-scale MIMO arrays. Such attractive features prove the utility of the proposed antenna in various modern electronic devices.

本论文提出一款兼具低剖面与柔性特性的多输入多输出（MIMO）天线阵列。该阵列以E面构型排布多片微带贴片，并通过短路四分之一波长枝节实现端口去耦。天线单元间距仅为0.032λ，其中λ为中心频率对应的自由空间波长。为验证所提方案的可行性，本文加工制作了1×4 MIMO阵列样机。对该样机的实测结果显示，这款MIMO天线在4.8 GHz频段具备优良的工作性能：反射系数小于–10 dB，端口隔离度优于20 dB。此外，其还拥有良好的辐射方向图与约4.5 dBi的边射增益。该天线可适配弯折工况，且具备扩展为大规模MIMO阵列的潜力。上述优异特性充分证明了所提天线在各类现代电子设备中的应用价值。