本文選題：復合左右手傳輸線 + 雙通帶��； 參考：《北京郵電大學》2014年碩士論文

【摘要】：隨著信息技術(shù)的高速發(fā)展,現(xiàn)代通信系統(tǒng)對微波器件的多頻、寬頻帶、小型化等性能提出了更高的要求。在傳統(tǒng)方法難以改善其性能的情況下,具有低損耗、寬頻帶、平衡性等新穎物理特性的復合左右手傳輸線為電磁領(lǐng)域開辟了一個極具潛力的研究方向。目前,復合左右手傳輸線的物理特性已經(jīng)在理論和實驗上得到了驗證,其新型的結(jié)構(gòu)設(shè)計和應用成為了物理和電磁領(lǐng)域的研究焦點。本文對復合左右手傳輸線的理論和實踐進行了推導和研究,著重于新穎結(jié)構(gòu)設(shè)計,并在漏波天線和生物醫(yī)學領(lǐng)域進行了應用探索。 本文主要內(nèi)容包括： 1)從微帶線的分析入手分析了復合左右手傳輸線的作用機理,研究了理想復合左右手傳輸線以及LC網(wǎng)絡(luò)形式的復合左右手傳輸線的原理和特性。 2)提出了一種新穎的雙通帶的二單元X型復合左右手傳輸線。采用場路結(jié)合的研究方法,從理論和實驗上推導和驗證了該結(jié)構(gòu)的相關(guān)獨特的電磁特性。該傳輸線實現(xiàn)了在6.27GHz-6.56GHz頻段呈現(xiàn)右手通帶特性,在11GHz-16.5GHz頻段呈現(xiàn)寬帶的復合左右手平衡型通帶特性。 3)提出了一種四單元的X型金屬片周期性排列構(gòu)成的復合左右手傳輸線,并從集總參數(shù)等效電路、S參數(shù)提取和實驗等方面分別分析驗證了其通帶特性,傳輸特性以及左手特性。該結(jié)構(gòu)在9.3GHz-10.08GHz呈現(xiàn)右手特性；在10.08GHz-10.9GHz呈現(xiàn)左手特性,具有1.6GHz的傳輸帶寬。 4)改進設(shè)計了一款基于平行板電容和彎折微帶線的新型復合左右手傳輸線結(jié)構(gòu),該結(jié)構(gòu)在0.9GHz-7.5GHz的頻帶內(nèi)實現(xiàn)平衡型CRLH結(jié)構(gòu)�；谠摻Y(jié)構(gòu)設(shè)計了CRLH傳輸線漏波天線。該天線在2.25GHz處獲得良好的左右手平衡特性,實現(xiàn)從-380到250的寬邊輻射。 5)研究了CRLH傳輸線在減少人體吸收輻射能量中的應用。仿真表明,加入阻抗匹配的CRLH傳輸線作為屏蔽板對天線的輻射性能影響不大,而人體對天線輻射能量的吸收減少顯著。
[Abstract]:With the rapid development of information technology, modern communication systems require higher performance of microwave devices such as multi-frequency, broad-band and miniaturization. Under the condition that it is difficult to improve the performance of the traditional method, the composite left-hand transmission lines with novel physical characteristics such as low loss, wide band, balance and so on have opened up a potential research direction for the electromagnetic field. At present, the physical properties of the composite left-hand transmission line have been verified theoretically and experimentally, and its new structure design and application have become the focus of research in the field of physics and electromagnetism. In this paper, the theory and practice of the compound left-hand transmission line are deduced and studied, with emphasis on the novel structural design, and its application in the field of leaky antenna and biomedicine. The main contents of this paper are as follows: 1) starting with the analysis of microstrip lines, the mechanism of composite left-right transmission lines is analyzed, and the principle and characteristics of ideal composite left-right and right-hand transmission lines and composite left-right hand transmission lines in the form of LC network are studied. 2) A novel two-element X-type compound left-right-hand transmission line with double pass band is proposed. The related unique electromagnetic characteristics of the structure are deduced and verified theoretically and experimentally by using the method of field-circuit combination. The transmission line has the characteristics of the right hand passband in the 6.27GHz-6.56GHz band and the broadband band in the 11GHz-16.5GHz band. 3) A compound left-right hand transmission line composed of four elements of X-type metal sheet is proposed, and its passband characteristic, transmission characteristic and left-handed characteristic are analyzed and verified from the aspects of lumped parameter equivalent circuit s parameter extraction and experiment. The structure presents the right hand characteristic in 9.3GHz-10.08GHz and the left-handed characteristic in 10.08GHz-10.9GHz with the transmission bandwidth of 1.6GHz. 4) A novel compound left-right hand transmission line structure based on parallel plate capacitance and bending microstrip line is designed. The structure realizes balanced CRLH structure in the band of 0.9GHz-7.5GHz. Based on this structure, the CRLH transmission line leaky wave antenna is designed. The antenna has a good balance between left and right at 2.25GHz, and has a wide edge radiation from-380 to 250. 5) the application of CRLH transmission line in reducing the radiation energy absorbed by human body is studied. Simulation results show that the CRLH transmission line with impedance matching has little effect on the radiation performance of the antenna, but the absorption of the radiation energy of the antenna is significantly reduced by the human body.
【學位授予單位】：北京郵電大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN811

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本文編號：1913576