A MIMO antenna with adequate compactness for applications like sensor heads, automotive radars and communication systems etc. is presented here. Significant size reduction with overall dimensions of 40 mm$\times$6 mm has been achieved. Substrate RT/duroid 5880 of 0.8 mm thickness was used for the fabrication of proposed antenna which has low dielectric constant (2.2) and low dielectric loss so it is suitable for high frequency applications. Incorporating two rectangular slots in the radiating patch has helped to reduced the coupling via surface wave propagation and use of defective ground as decoupling structure has contributed for significant isolation improvement. These were major design considerations in this work. Important parameters which enlighten the antenna characteristics e.g. S-Parameters, Total Active Reflection Coefficient (TARC), Radiation Patterns, Diversity Gain, Efficiency and Envelope Correlation Coefficient (ECC) were calculated, measured and compared. Isolation between multiple antenna is a paramount index for MIMO antenna, was achieved better than −35 dB. Adequate bandwidth of 4.44 GHz (21.43–25.87 GHz) with radiation efficiency up to 87% was optimized in this design. The efficiency plot has sharp dilapidation beyond the proposed band of interest which indicates a superior antenna performance for interference suppression. CST Microwave Studio has been used for modelling and simulation. Fabricated antenna was tested in an anechoic chamber and measured results were in agreement with the simulated results. Satisfactory results and miniaturized size make the proposed design highly suitable for radars, communication and sensor applications.

本文介绍了一种具有足够紧凑性的MIMO天线，适用于诸如传感器头，汽车雷达和通信系统等应用。尺寸大幅减小，整体尺寸为40 mm$\times$已达到6毫米。厚度为0.8 mm的RT / duroid 5880基板用于制造所建议的天线，该天线具有较低的介电常数（2.2）和较低的介电损耗，因此适用于高频应用。在辐射贴片中合并两个矩形缝隙有助于减少通过表面波传播的耦合，并且使用有缺陷的接地作为去耦结构有助于显着提高隔离度。这些是这项工作中的主要设计注意事项。计算，测量和比较了启发天线特性的重要参数，例如S参数，总有源反射系数（TARC），辐射方向图，分集增益，效率和包络相关系数（ECC）。多天线之间的隔离度是MIMO天线的首要指标，达到了优于-35 dB的水平。此设计优化了4.44 GHz（21.43–25.87 GHz）的足够带宽，辐射效率高达87％。效率图在建议的感兴趣频段之外具有明显的破损，这表明天线具有出色的干扰抑制性能。CST Microwave Studio已用于建模和仿真。人造天线在消声室内进行了测试，测量结果与模拟结果吻合。令人满意的结果和最小的尺寸使建议的设计非常适合于雷达，通信和传感器应用。效率图在建议的感兴趣频段之外具有明显的破损，这表明天线具有出色的干扰抑制性能。CST Microwave Studio已用于建模和仿真。人造天线在消声室内进行了测试，测量结果与模拟结果吻合。令人满意的结果和最小的尺寸使建议的设计非常适合于雷达，通信和传感器应用。效率图在建议的感兴趣频段之外具有严重的破损，这表明天线具有出色的干扰抑制性能。CST Microwave Studio已用于建模和仿真。人造天线在消声室内进行了测试，测量结果与模拟结果吻合。令人满意的结果和最小的尺寸使建议的设计非常适合于雷达，通信和传感器应用。