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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >Isolation Enhancement Between Tightly Spaced Compact Unidirectional Patch-Antennas on Multilayer EBG Surfaces
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Isolation Enhancement Between Tightly Spaced Compact Unidirectional Patch-Antennas on Multilayer EBG Surfaces

机译：多层EBG表面上紧密间隔的紧凑单向贴片天线之间的隔离增强

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摘要

In this article, ultracompact unidirectional patch antennas are used in differentrntwo-antenna systems for biomedical applications at 5.2 GHz. Multilayer mushroom type electromagneticrnbandgap (EBG) structures are designed as slow-wave medium to reduce the sizernof the individual patch antennas to 0.1λ_0 by 0.18λ_0. Various techniques are investigatedrnherein to improve antenna isolation for an enhanced Multiple-Input Multiple-Outputrn(MIMO) performance. First, the coupling between 0.3λ_0-spaced antennas is verified to occurrndominantly through radiation and near-field coupling between the patches rather thanrnthrough substrate-bound modes. Second, various configurations are proposed to suppressrnantenna coupling. These approaches include reorientation of the antennas and employment ofrnparasitic radiators between the patches. A novel design is presented in which a unidirectionalrnparasitic slot radiator on an EBG reflector is inserted between the antennas to decouplernthem. Measurement results confirm efficacy of these approaches in mitigating antenna couplingrnby more than 11 dB in the operating bandwidth of the antennas. The compact patchrnantennas maintain efficiency values of higher than 70%.
机译：本文将超紧凑型单向贴片天线用于5.2 GHz生物医学应用的不同双天线系统中。多层蘑菇型电磁带隙（EBG）结构被设计为慢波介质，可将单个贴片天线的尺寸减小到0.1λ_0x0.18λ_0。本文研究了各种技术以改善天线隔离，以增强多输入多输出（MIMO）性能。首先，验证了间距为0.3λ_0的天线之间的耦合主要通过贴片之间的辐射和近场耦合发生，而不是通过基板绑定模式发生。其次，提出了各种配置来抑制天线耦合。这些方法包括天线的重新定向和在贴片之间使用寄生辐射器。提出了一种新颖的设计，其中在天线之间插入了EBG反射器上的单向寄生缝隙辐射器以使它们解耦。测量结果证实了这些方法在将天线的工作带宽中的天线耦合降低11dB以上方面的功效。紧凑的贴片天线可保持高于70％的效率值。

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