移动终端中的多频段天线与MIMO天线设计

发布时间：2019-06-15 00:29

【摘要】：随着移动通信进入4G时代,消费者对移动通信终端的要求日益增多。而这将使移动终端中的天线设计变得更加困难。移动终端中高度集成的功能使得天线覆盖频带更宽,使得多天线单元间必须具有良好的隔离度以保证性能。轻薄化的外观趋势使天线设计空间更为有限,尤其使最低频谐振的实现更具挑战。近期金属质感手机的流行使得内置手机天线性能受到金属边框结构的极大影响。对表征人体吸收电磁辐射的参数SAR的控制也引起极大重视。首先,在符合如今流行的手机尺寸的基板上设计出一款覆盖WLAN全频段的天线和一款可覆盖LTE700的三频段天线。对频带宽度、辐射方向图、效率、电流分布等指标进行研究,并将WLAN天线的设计加工实物,进行测试验证。其次,设计一款覆盖移动通信高频段的LTE MIMO天线,通过耦合馈电方式增大带宽。对天线的频带宽度、辐射方向图、效率、增益、电流分布等进行研究,并对比天线单元在基板上的两种不同的安放位置,研究位置对天线单元间隔离度和相关系数的影响。依照设计对天线进行加工实测,所得测试结果与仿真结果吻合。最后,设计一款应用于带有闭合金属框架结构手机的天线,利用金属边框和内置天线的共同作用来覆盖移动通信七频段。在设计过程中还考虑到手机实际的复杂环境,加入多种部件以更接近真实。对所设计天线在自由空间、头模型、头和手模型三种状态下进行研究,包括频带宽度、效率等重要参数。并对设计天线的SAR值进行模拟研究。
[Abstract]:With the entry of mobile communication into 4G era, consumers have more and more requirements for mobile communication terminals. This will make the antenna design in the mobile terminal more difficult. The highly integrated function in the mobile terminal makes the antenna coverage band wider, so that the multi-antenna elements must have good isolation to ensure the performance. The lightweight appearance trend makes the antenna design space more limited, especially makes the realization of minimum frequency resonance more challenging. Recently, the popularity of metal texture mobile phone makes the antenna performance of built-in mobile phone greatly affected by the metal frame structure. The control of the parameter SAR, which represents the absorption of electromagnetic radiation by human body, has also attracted great attention. First, a full-band antenna covering WLAN and a three-band antenna covering LTE700 are designed on a substrate that fits the size of today's popular mobile phone. The frequency band width, radiation pattern, efficiency, current distribution and other indexes are studied, and the design and processing of WLAN antenna are tested and verified. Secondly, a LTE MIMO antenna covering the high frequency band of mobile communication is designed, and the bandwidth is increased by coupling feed. The frequency band width, radiation pattern, efficiency, gain and current distribution of the antenna are studied, and the effects of the position on the interval distance and correlation coefficient of the antenna element are compared with the two different placement positions of the antenna element on the substrate. According to the design, the antenna is processed and measured, and the test results are in good agreement with the simulation results. Finally, an antenna with closed metal frame structure is designed, which uses the combination of metal frame and built-in antenna to cover the seven-band of mobile communication. In the design process, the actual complex environment of the mobile phone is also taken into account, and a variety of components are added to get closer to reality. The designed antenna is studied in three states: free space, head model, head model and hand model, including frequency band width, efficiency and other important parameters. The SAR value of the designed antenna is simulated and studied.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN828.6

【参考文献】