本文選題：手機(jī)天線 + 多頻段�。� 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：隨著蜂窩移動(dòng)通信的迅速發(fā)展,手機(jī)可以工作在WIFI/WiMAX/3G等越來越多的無線網(wǎng)絡(luò)中。因此,手機(jī)天線必須覆蓋更多的工作頻段,包括GSM/DCS/PCS/ISM等頻段。由于手機(jī)日趨小型化、輕薄化的產(chǎn)品需求,硬件設(shè)計(jì)中為天線預(yù)留的空間非常有限,而手機(jī)天線又是無線通訊的關(guān)鍵環(huán)節(jié),所以許多設(shè)計(jì)者都在致力于手機(jī)天線的小型化和多頻帶研發(fā)。論文針對(duì)低剖面內(nèi)置多頻段手機(jī)天線的設(shè)計(jì)和優(yōu)化展開了研究工作。主要內(nèi)容包括:1.總結(jié)了微帶天線的饋電方式及微帶天線分析中需注意的表面波效應(yīng)。討論了手機(jī)天線的方向圖等主要特性參數(shù)和微帶天線分析中常用的原理和方法,詳細(xì)分析了幾種經(jīng)典的雙頻、三頻PIFA天線以及單極天線在實(shí)際的手機(jī)設(shè)計(jì)應(yīng)用中存在的性能優(yōu)勢(shì)與缺陷,并歸納了已經(jīng)被提出的設(shè)計(jì)技巧和優(yōu)化方案。2.針對(duì)手機(jī)天線要覆蓋更多工作頻段的通信需求和平面單極天線尺寸小、剖面低、容易在多頻段工作等諸多優(yōu)勢(shì),設(shè)計(jì)了兩個(gè)內(nèi)置寬頻帶單極手機(jī)天線。詳細(xì)闡述了設(shè)計(jì)的思路與流程,并結(jié)合仿真軟件進(jìn)行多次調(diào)試、優(yōu)化,討論了天線設(shè)計(jì)中結(jié)構(gòu)體各主要尺寸參數(shù)的變動(dòng)對(duì)整體天線性能的影響。最后兩個(gè)天線均實(shí)現(xiàn)了良好的阻抗帶寬,可以覆蓋GSM/DCS/PCS/UMTS等通訊頻段,且其在所覆蓋工作頻段內(nèi)呈現(xiàn)出較好的全向性,加之二者低剖面、易封裝等特,適合在實(shí)際的手機(jī)設(shè)計(jì)中應(yīng)用。3.詳細(xì)闡述了阻抗匹配的基本原理,從理論上分析了匹配電路在手機(jī)天線設(shè)計(jì)中應(yīng)用潛在的優(yōu)缺點(diǎn),討論了利用匹配電路來優(yōu)化天線性能過程中應(yīng)遵循的設(shè)計(jì)準(zhǔn)則。詳細(xì)地介紹了利用CST(Computer Simulation Technology)microwave studio及ADS(Advanced Design System)軟件聯(lián)合仿真,進(jìn)行天線的匹配電路設(shè)計(jì)的流程。通過對(duì)兩個(gè)PIFA天線實(shí)例進(jìn)行匹配電路設(shè)計(jì),驗(yàn)證了匹配電路在天線性能優(yōu)化中的優(yōu)勢(shì)與弊端,得出結(jié)論:匹配電路是手機(jī)天線設(shè)計(jì)中靠調(diào)節(jié)天線輻射體自身改變天線性能出現(xiàn)瓶頸時(shí)的一個(gè)新出路,在改變天線體自身無法再優(yōu)化時(shí),通過匹配電路的加載,可能會(huì)給天線性能帶來很大的提升。但此種方案并非適用于所有的手機(jī)天線,不是所有的既定天線都能通過匹配電路的引入而得到理想的性能提升。匹配電路的選擇與設(shè)計(jì)要綜合考慮其給天線射頻性能各方面帶來的改變。
[Abstract]:With the rapid development of cellular mobile communication, mobile phones can work in more and more wireless networks such as WIFI/WiMAX/3G. Therefore, the mobile phone antenna must cover more working frequency bands, including GSM/DCS/PCS/ISM and so on. Due to the increasing miniaturization and thinning of mobile phones, the space reserved for antennas in hardware design is very limited, and the antenna of mobile phones is a key link in wireless communication. So many designers are working on the miniaturization of mobile phone antennas and multi-band R & D. In this paper, the design and optimization of low-profile multi-band mobile phone antenna are studied. The main contents include: 1. The feed mode of microstrip antenna and the surface wave effect in the analysis of microstrip antenna are summarized. This paper discusses the main characteristic parameters such as the pattern of antenna of mobile phone, the principle and method commonly used in the analysis of microstrip antenna, and analyzes in detail several kinds of classical dual-frequency. The advantages and disadvantages of three-frequency PIFA antenna and monopole antenna in the design and application of mobile phone are summarized. Aiming at the communication requirement of mobile phone antenna covering more working frequency bands and the advantages of small size of planar monopole antenna, low profile and easy to work in multi-frequency band, two built-in broadband monopole mobile phone antennas are designed. The idea and flow of the design are described in detail, and the simulation software is used to debug and optimize the antenna. The influence of the main dimension parameters of the structure on the performance of the whole antenna is discussed. The last two antennas have achieved good impedance bandwidth, which can cover GSM/DCS/PCS/UMTS and other communication frequency bands, and show good omnidirectional performance in the working band covered by them. In addition, the two antennas have low profile and are easy to encapsulate, etc. Suitable for the actual mobile phone design application. 3. The basic principle of impedance matching is described in detail, the potential advantages and disadvantages of matching circuit in antenna design of mobile phone are analyzed theoretically, and the design criteria to be followed in the process of optimizing antenna performance by using matching circuit are discussed. The flow chart of antenna matching circuit design using CST(Computer Simulation Technology)microwave studio and ADS(Advanced Design system software is introduced in detail. Through the design of matching circuit for two PIFA antenna examples, the advantages and disadvantages of matching circuit in antenna performance optimization are verified. The conclusion is that the matching circuit is a new way to change the antenna performance by adjusting the antenna radiator itself. When the antenna body itself can not be optimized, the matching circuit is loaded. It may bring a great improvement to the antenna performance. However, this scheme is not suitable for all mobile phone antennas, and not all the fixed antennas can be improved by the introduction of matching circuits. The selection and design of matching circuit should take into account the change of antenna RF performance.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN828.6

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 蔡漢龍;手機(jī)天線的模擬仿真與研究[D];電子科技大學(xué);2013年

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本文編號(hào)：1789809