【摘要】：微帶天線因其具有低剖面、重量輕、結(jié)構(gòu)緊湊、易加工、便于與微波電路集成等優(yōu)點(diǎn),在通信領(lǐng)域得到了廣泛的應(yīng)用。然而,隨著移動(dòng)通信用戶規(guī)模的不斷擴(kuò)大,現(xiàn)有的頻譜資源變得十分緊張。為了拓展信道容量,對(duì)可以工作在雙頻或多頻段的微帶天線出現(xiàn)了緊迫的需求。特別是應(yīng)用于無(wú)線局域網(wǎng)或衛(wèi)星通信等場(chǎng)合時(shí),雙頻天線的兩個(gè)工作頻段的頻率比一般均較高,往往超出了普通雙頻微帶天線的方向圖帶寬范疇。因此,高頻率比雙頻微帶天線的研究具有十分重要的工程意義。本文針對(duì)無(wú)線局域網(wǎng)的802.11b/g/n/a標(biāo)準(zhǔn)所覆蓋的2.4GHz頻段和5GHz頻段,提出了兩種具有高頻率比并且具備無(wú)畸變方向圖的雙頻微帶天線設(shè)計(jì)方案,并進(jìn)行了相關(guān)的實(shí)驗(yàn)驗(yàn)證。論文的主要內(nèi)容包括以下幾個(gè)部分:首先,本文明確了課題的研究目的和意義,回顧了微帶天線的基本原理和分析方法,后詳細(xì)論述了微帶天線的雙頻、寬帶以及小型化的經(jīng)典手段。其次,提出并設(shè)計(jì)了一種采用同軸探針饋電,結(jié)構(gòu)簡(jiǎn)單、易于加工的大頻率比雙頻單極化微帶天線,并進(jìn)行了加工測(cè)試,分析驗(yàn)證了其各項(xiàng)性能,實(shí)驗(yàn)結(jié)果表明該天線在頻率比高達(dá)2.4:1的雙頻頻帶內(nèi)方向圖穩(wěn)定,且天線性能指標(biāo)良好。第三,利用雙頻共口徑的技術(shù)手段設(shè)計(jì)了一款高頻率比的雙端口、雙頻微帶天線單元,通過(guò)縫隙微擾的方式極大程度的消除了雙頻單元之間的互耦干擾,改善了方向圖的畸變,數(shù)值仿真結(jié)果表明該天線在兩個(gè)頻段內(nèi)的輻射效率均在70%以上,且天線性能良好。
[Abstract]:Microstrip antenna has been widely used in the field of communication because of its advantages of low profile, light weight, compact structure, easy processing and easy integration with microwave circuits. However, with the continuous expansion of mobile communication users, the existing spectrum resources become very tight. In order to expand the channel capacity, there is an urgent need for microstrip antennas which can work in dual-frequency or multi-frequency bands. Especially when it is used in wireless local area network (WLAN) or satellite communication, the frequency ratio of two working frequency bands of dual-frequency antenna is higher than that of conventional dual-frequency microstrip antenna. Therefore, the study of high frequency ratio dual-frequency microstrip antenna has very important engineering significance. In this paper, for the 2.4GHz band and 5GHz band covered by 802.11b/g/n/a standard of WLAN, two design schemes of dual-frequency microstrip antenna with high frequency ratio and no distortion pattern are proposed and verified by experiments. The main contents of this paper are as follows: firstly, the purpose and significance of the research are clarified, the basic principle and analysis method of microstrip antenna are reviewed, and the dual frequency of microstrip antenna is discussed in detail. Broadband and miniaturization of the classic means. Secondly, a large frequency ratio dual-frequency single-polarization microstrip antenna fed by coaxial probe is proposed and designed, which is simple in structure and easy to be machined. The processing tests are carried out, and the performances of the antenna are analyzed and verified. The experimental results show that the antenna is stable in the dual-frequency band with a frequency ratio of up to 2.4: 1, and the antenna performance is good. Thirdly, a dual-port dual-frequency microstrip antenna unit with high frequency ratio is designed by means of dual-frequency common aperture technique. By means of slot perturbation, the mutual coupling interference between the dual-frequency elements is greatly eliminated, and the distortion of the pattern is improved. The numerical simulation results show that the radiation efficiency of the antenna is more than 70% in the two frequency bands, and the antenna has good performance.
【學(xué)位授予單位】：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)】：TN822

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 孫向珍;圓極化雙層微帶天線的研究[J];遙測(cè)遙控;2004年05期

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本文編號(hào)：2208669