【作者】 杨丽；

【导师】 李融林；

【作者基本信息】 华南理工大学 ， 通信与信息系统， 2015， 硕士

【摘要】 随着移动通信技术的迅猛发展,手机已经成为人们最主要的沟通工具,并被赋予越来越多的功能。天线作为手机中极其重要的组成部分,为了满足不断提出的无线通讯标准,也朝着多频化、宽带化、平面化方向发展。因此,研究能够覆盖现有所有通信频段(包括LTE三个频段LTE 700/2300/2600,WWAN五个频段GSM 850/900/1800/1900/UMTS,WLAN三个频段2.4/5.2/5.8 GHz,Wi MAX三个频段2.5/3.5/5.5 GHz)的多模平面手机天线具有重要的实用价值。本文着重研究如何通过新的天线结构来实现LTE/WWAN/WLAN/Wi MAX所有频段的覆盖。首先,论文综述了课题的研究背景、研究意义以及国内外研究现状,并对手机天线的基本理论、性能参数、设计技术和测试标准进行了介绍。其次,论文提出了一种双平面LTE/WWAN/WLAN/Wi MAX手机天线,该天线采用弯折辐射枝节、多分枝技术和双带线耦合结构来实现天线的小型化、多频化和宽带化。天线尺寸为125 mm×65 mm×0.508 mm,当天线电压驻波比VSWR?3(回波损耗Return loss?6 d B)时,天线的带宽分别为:696-970 MHz、1683-2700 MHz、3070-3755 MHz和4590-7604 MHz。通过调整天线结构和优化相关参数,这种双平面LTE/WWAN/WLAN/Wi MAX手机天线符合国际化性能标准,非常适合应用于超薄智能手机终端中。另外,上述天线结构十分紧凑、复杂,很难进行频段拓展。论文在折叠环形天线和共面波导环形天线的研究基础上,提出了一种单平面闭合环形手机天线,并通过开槽闭合环形天线、添加感性枝节的闭合环形天线的仿真实例,验证了这种单平面闭合环形天线能够用于实现手机天线的多频化、宽带化。最后,在单平面闭合环形手机天线的研究基础上,论文提出了一种单平面LTE/WWAN/WLAN/Wi MAX/GPS手机天线,天线尺寸为145 mm×60 mm×0.508 mm,当天线电压驻波比VSWR?3(回波损耗Return loss?6 d B)时,天线的带宽分别为:687-976 MHz、1195-1246 MHz和1423-7665 MHz。通过调整天线结构和优化相关参数,这种单平面LTE/WWAN/WLAN/Wi MAX/GPS手机天线符合国际化性能标准,具有一定的工程应用价值。更多还原

【Abstract】 With the rapid development of mobile communication technology, mobile phone handsets have become the main communication tools, and been endowed with more and more functions. As a key component of a mobile phone, the antenna has to satisfy more wireless communication standards. Multi-broadband and planarization antennas for mobile phone are the emerging trend. Therefore, it is very practical to study the multi-mode planar antennas which can cover all the existing communication frequencies(LTE 700/2300/2600, GSM 850/ 900/1800/1900/UMTS, WLAN 2.4/5.2/5.8 GHz, Wi MAX 2.5/3.5/5.5 GHz). In this paper, we focus on how to cover all the frequencies of LTE/WWAN/WLAN/Wi MAX by using novel antenna structures.Firstly, we summarize the research background, significance and status of the subject. The related theory, performance parameters, designing techniques and test standards of a mobile phone antenna are also presented.Secondly, a biplanar antenna for LTE/WWAN/WLAN/Wi MAX handsets is proposed. Antenna miniaturization and multi-band/wideband operation are realized by using the meander lines,multi-branched technology and the two-strip configurations. The antenna has a total size of 125 mm × 65 mm × 0.508 mm, and covers four frequency bands(696-970 MHz, 1683-2700 MHz, 3070-3755 MHz and 4590-7604 MHz) for VSWR ≤ 3(Return loss ≥ 6 d B). The biplanar antenna for LTE/WWAN/WLAN/Wi MAX handsets can meet the international performance standards by adjusting the antenna structure and optimizing the related parameters, which is very suitable for applications in ultra-slim smart mobile handsets.Thirdly, the above antenna structure is so compact that there is no space for more frequency bands. Therefore, a uniplanar closed loop antenna is proposed on the basis of folded/CPW loop antenna. Two uniplanar closed loop antennas with slots and inductive branches are designed, respectively, which verify that the uniplanar closed loop antenna can be used to realize multi-band/wideband planar antennas.Finally, on the basis of the uniplanar closed loop antenna, a uniplanar antenna for LTE/WWAN/WLAN/Wi MAX/GPS handsets is proposed. This antenna has a total size of 145 mm × 60 mm × 0.508 mm, and covers three frequency bands(687-976 MHz, 1195-1246 MHz and 1423-7665 MHz) for VSWR ≤ 3(Return loss ≥ 6 d B). The uniplanar antenna for LTE/WWAN/WLAN/Wi MAX/GPS handsets can meet the international performance standards and has certain value for engineering application by adjusting the antenna structure and optimizing the related parameters.更多还原