DESIGN OF FRAGMENT-TYPE ISOLATION STRUCTURES FOR MIMO ANTENNAS
DESIGN OF FRAGMENT-TYPE ISOLATION STRUCTURES FOR MIMO ANTENNAS
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DOI：
10.2528/pierc14051504
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发表时间：
2014
影响因子：
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通讯作者：
Lu Wang-;G. Wang;J. Sidén
中科院分区：
文献类型：
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作者：
Lu Wang-;G. Wang;J. Sidén
分段结构在多输入多输出（MIMO）天线间获得高隔离度方面有着重要的应用。通过将设计空间网格化为碎片单元，可以通过金属化一些碎片单元来构造碎片型隔离结构。对于MIMO隔离设计，可以通过优化搜索方案来选择要金属化的单元，该优化搜索方案具有诸如MIMO天线的隔离度、回波损耗甚至辐射方向图的目标。由于碎片型隔离结构的无穷大灵活性，碎片型结构具有比典型隔离结构更高的隔离度的潜力。本文将基于分解结合遗传算子的多目标进化算法（MOEA/D-GO）应用于MIMO贴片天线和MIMO PIFA的分段式隔离结构设计。结果表明，采用分段式隔振设计可以在不同程度上改善隔振效果。进一步讨论了碎片型隔离设计中的一些技术问题，如碎片单元尺寸、设计空间、金属单元密度和效率等因素的影响。
Fragment structure should flnd its application in acquiring high isolation between multiple- input multiple-output (MIMO) antennas. By gridding a design space into fragment cells, a fragment- type isolation structure can be constructed by metalizing some of the fragment cells. For MIMO isolation design, cells to be metalized can be selected by optimization searching scheme with objectives such as isolation, return losses, and even radiation patterns of MIMO antennas. Due to the ∞exibility of fragment-type isolation structure, fragment-type structure has potentials to yield isolation higher than canonical isolation structures. In this paper, multi-objective evolutionary algorithm based on decomposition combined with genetic operators (MOEA/D-GO) is applied to design fragment-type isolation structures for MIMO patch antennas and MIMO PIFAs. It is demonstrated that isolation can be improved to difierent extents by using fragment-type isolation design. Some technique aspects related to the fragment-type isolation design, such as efiects of fragment cell size, design space, density of metal cells, and e-ciency consideration, are further discussed.