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首页> 外文会议>Proceedings of the Fourth European Conference on Antennas and Propagation >High isolation compact four-port MIMO antenna systems with built-in filters as isolation structure
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High isolation compact four-port MIMO antenna systems with built-in filters as isolation structure

机译：带有内置滤波器作为隔离结构的高隔离紧凑型四端口MIMO天线系统

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摘要

In this work, we present a built-in filter method to enhance the isolation level between closely packed MIMO antennas. The built-in filter is composed of several slits etched on the ground of the antenna structure. The number and length of slits depend on both the resonance frequency and the structure of the MIMO antenna system. To illustrate its usefulness, two designs of compact planar four-port MIMO antenna systems with built-in filters are proposed. One MIMO system is composed of different types of antennas with similar radiation characteristics, such as polarization. The lateral size of the whole system is 0.64λ×0.48λ. To further reduce the size of the MIMO structure, polarization diversity is utilized in the second example. The dimension is only 0.4λ×0.4λ. In both cases, with the built-in filters, the isolation level can be improved by 10dB. In both MIMO systems, the measured port isolations between antennas are below −25dB, and the envelope correlations are smaller than 0.04, indicating good MIMO performance.
机译：在这项工作中，我们提出了一种内置的滤波方法来增强紧密封装的MIMO天线之间的隔离度。内置滤波器由蚀刻在天线结构地面上的几个缝隙组成。缝隙的数量和长度取决于谐振频率和MIMO天线系统的结构。为了说明其实用性，提出了两种带有内置滤波器的紧凑型平面四端口MIMO天线系统的设计。一个MIMO系统由具有类似辐射特性（例如极化）的不同类型的天线组成。整个系统的横向尺寸为0.64λ×0.48λ。为了进一步减小MIMO结构的尺寸，在第二示例中利用了极化分集。尺寸仅为0.4λ×0.4λ。在这两种情况下，都可以使用内置滤波器将隔离级别提高10dB。在两个MIMO系统中，测得的天线之间的端口隔离度均低于-25dB，包络相关性小于0.04，表明MIMO性能良好。

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