小型化多频段MIMO手机天线设计

发布时间：2018-05-02 00:21

本文选题：MIMO手机天线 + PIFA天线　；参考：《电子科技大学》2014年硕士论文

【摘要】：MIMO(Mitiple-Input Mitiple-Output)技术被广泛认为是第四代LTE(Long Term Evolution)移动通信系统的核心技术之一。但是,由于手机天线的尺寸以及天线单元之间的互耦等因素的限制,MIMO技术在蜂窝移动通信中还很少实现商业应用。同时,第四代LTE移动通信系统需要兼顾前三代的很多频段,这就要求手机天线不仅要有较小的尺寸而且还要具备多频段的特性。鉴于此,本文对小型化多频段MIMO手机天线进行了深入的研究。本文首先对PIFA天线的性能和多种实现天线小型化多频段的技术进行研究,为MIMO手机天线单元的设计提供了必要的理论基础。其中重点研究了手机天线设计中耦合馈电技术、匹配电路加载技术、弯折线加载技术和集总电感加载技术在实现手机天线的多频段、宽带、小型化方面的积极作用。通过采用耦合馈电和弯折线加载技术,创新性地设计了两款小型化七频段平面印刷手机天线。通过采用带阻匹配电路加载和集总电感加载技术,设计了一款小型化八频段立体手机天线。仿真和测试结果表明该三款手机天线都具有很好的驻波和辐射性能。其次对地枝结构去耦技术进行了研究,并设计了一款小型化七频段的MIMO手机天线。该MIMO天线单元的尺寸为325?10?4mm,天线单元的间距为10mm,通过一个由U形和两对称的L形金属带构成的新型地枝去耦结构为该天线进行宽带解耦。仿真和测试结果表明该MIMO手机天线的S11、隔离度、天线的辐射效率、3-D辐射方向图以及ECC均满足设计要求。最后对中合线去耦原理进行了研究,并结合地枝结构去耦技术,设计了一款小型化七频段MIMO手机天线。该MIMO天线单元的尺寸为328?10?4mm,天线单元的间距为4mm。为了实现天线单元良好的阻抗匹配以及实现天线高频部分的解耦,在两天线单元之间引入一个T形地枝结构。此外,设计了一种新型带有集总电感的U形中合线结构来提高低频部分的隔离度。仿真和测试结果表明在T形地枝结构和U形中合线结构的共同作用下,该天线单元之间的隔离度在七个频段内均高于10dB。
[Abstract]:MIMO(Mitiple-Input Mitiple-Output technology is widely considered as one of the core technologies of the fourth generation LTE(Long Term Evolution system. However, due to the limitation of antenna size and mutual coupling between antenna elements, MIMO technology is rarely used in cellular mobile communication. At the same time, the fourth generation LTE mobile communication system needs to take into account the previous three generations of many frequency bands, which requires that the mobile phone antenna not only has a smaller size but also has multi-band characteristics. In view of this, the miniaturized multi-band MIMO mobile phone antenna is studied in this paper. In this paper, the performance of PIFA antenna and various techniques to realize the antenna miniaturization and multi-band are studied, which provides the necessary theoretical basis for the design of antenna unit of MIMO mobile phone. Among them, the coupling feed technology, matching circuit loading technology, bending line loading technology and lumped inductance loading technology in the antenna design of mobile phone are mainly studied in the realization of multi-frequency band, broadband and miniaturization of mobile phone antenna. By using coupling feed and bending line loading technology, two miniature seven-band planar printed mobile phone antennas are designed innovatively. By using band-stop matching circuit loading and lumped inductance loading technology, a miniature eight-band stereo mobile phone antenna is designed. Simulation and test results show that the three mobile phone antennas have good standing wave and radiation performance. Secondly, the decoupling technology of ground branch structure is studied, and a miniaturized seven-band MIMO mobile phone antenna is designed. The size of the MIMO antenna unit is 325m 1010mm and the spacing of the antenna unit is 10mm. The antenna is decoupled by a new type of ground branch decoupling structure composed of U-shaped and two-symmetric L-shaped metal bands. The simulation and test results show that the S11, isolation, radiation efficiency and 3-D radiation pattern of the MIMO mobile antenna and ECC all meet the design requirements. Finally, the decoupling principle of the central line is studied, and a miniaturized seven-band MIMO mobile phone antenna is designed based on the ground branch structure decoupling technique. The size of the MIMO antenna unit is 328m 10mm and the spacing of the antenna unit is 4mm. In order to achieve good impedance matching of antenna elements and decoupling of the high frequency part of the antenna, a T-shaped ground branch structure is introduced between the two antenna elements. In addition, a novel U-shaped midline structure with lumped inductance is designed to improve the isolation of the low-frequency part. The simulation and test results show that the isolation degree between the antenna elements is higher than 10 dB in seven frequency bands under the joint action of T-shaped ground branch structure and U-shaped midline structure.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN828.6

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