LTE/Wimax应用中使用CPW馈电的紧凑型宽带和低互耦MIMO超材料天线

Research and Development on Information and Communication Technology Pub Date : 2018-07-26 DOI:10.32913/rd-ict.vol2.no15.676

D. T. T. Tu, Nguyen Tuan Ngoc, V. V. Yem

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引用次数: 2

摘要

本文采用共面波导馈电设计了一种超材料天线，以获得宽带和紧凑的尺寸。多输入多输出(MIMO)天线是基于改进的复合右手/左手(CRLH)模型，通过并排放置两个单超材料天线来构建的。在单天线和MIMO天线两种情况下，所提出的天线覆盖22%的实验带宽。该天线采用高度为1.6 mm的FR4衬底，尺寸紧凑，辐射贴片尺寸为5.75x14 mm2，谐振频率为3.5 GHz，适用于手持设备中的长期演进(LTE)/Wimax应用。此外，将缺陷接地结构(DGS)与共面结构的放大接地相结合，解决了采用CPW馈电的MIMO超材料天线中元件间相互耦合的难题。MIMO天线馈入点之间的距离为0.46\lambda_0，在大带宽下获得了−20 dB以下的高隔离度，仿真与实测结果吻合良好。DOI: 10.32913 / rd-ict.vol2.no15.676

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Compact Wide-Band and Low Mutual Coupling MIMO Metamaterial Antenna using CPW Feeding for LTE/Wimax Applications

In this paper, a metamaterial antenna is designed by using coplanar waveguide (CPW) feeding to obtain wideband and compact size. The Multiple-Input Multiple-Output (MIMO) antenna is constructed by placing side-by-side two single metamaterial antennas which are based on the modified composite right/left handed (CRLH) model. The proposed antenna covers 22% of the experimental bandwidth for both cases of single and MIMO antennas. Implemented in FR4 substrate with the height of 1.6 mm, the antenna is compact in size with radiating patch dimension of 5.75x14 mm2 at 3.5 GHz resonant frequency that is suitable for Long Term Evolution (LTE)/Wimax applications in handheld devices. Furthermore, the combination of Defected Ground Structure (DGS) and enlarged ground of coplanar structure has solved the challenge of mutual coupling between elements in the MIMO metamaterial antenna using CPW feeding. With the distance of 0.46\lambda_0 between feeding points, the MIMO antenna obtains the high isolation of under −20 dB for a huge bandwidth with a good agreement between simulations and measurements. DOI: 10.32913/rd-ict.vol2.no15.676

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Research and Development on Information and Communication Technology

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