本文選題：平面極化波　切入點：空間矢量分解　出處：《國防科學(xué)技術(shù)大學(xué)》2014年碩士論文

【摘要】：由于電磁環(huán)境的日益惡化,外場激勵下傳輸線系統(tǒng)的響應(yīng)分析與計算已經(jīng)成為計算電磁學(xué)和電磁兼容領(lǐng)域的重要課題。本文主要針對兩類傳輸線結(jié)構(gòu)——雙導(dǎo)體傳輸線和帶多條導(dǎo)電脊的PCB板——進行研究,分析了平面極化波的場線耦合途徑,通過等效模型和改進后的BLT方程,進行響應(yīng)的分析與計算。通過數(shù)值仿真實驗進一步驗證了本文方法的有效性,并得出平面波激勵響應(yīng)的量級和傳播特性,這對電磁防護工作有現(xiàn)實的指導(dǎo)意義。本文通過幾個步驟對外場激勵響應(yīng)進行了研究——空間矢量分解、分布參數(shù)提取、傳輸線方程推導(dǎo)、方程求解的數(shù)值技巧和BLT模型的進一步改進。1、給出了雙導(dǎo)線受平面波激勵下的空間矢量分解,借助方位角、極化角等概念確定場分量的解析表達式。對于結(jié)構(gòu)復(fù)雜的PCB板,本文把一般的反射系數(shù)推廣為廣義反射系數(shù),得到等效場的矢量分解形式。2、分布參數(shù)的提取是響應(yīng)求解的基礎(chǔ),本文給出了一般類型的傳輸線結(jié)構(gòu)的分布參數(shù)解析表達式,并針對一類非平行的傳輸線,基于電路參數(shù)的物理含義,通過積分過程來確定相應(yīng)場量,得到傳輸線分布參數(shù)的數(shù)值計算公式。3、研究了平面極化波激勵下PCB板的響應(yīng)問題。本文把PCB板等效為多導(dǎo)體傳輸線結(jié)構(gòu),給出相應(yīng)分布參數(shù)的數(shù)值計算公式,在對外場進行矢量分解后,通過應(yīng)用經(jīng)修正的BLT模型和多導(dǎo)體傳輸線方程求解響應(yīng)結(jié)果。4、對本文建立的模型方法進行數(shù)值仿真。仿真結(jié)果表明本文方法在時域、頻域上都有較好的擬合,進一步驗證了模型的有效性。得出以下結(jié)論:1伏特的激勵電壓在PCB的導(dǎo)電脊上產(chǎn)生的響應(yīng)電壓的量級為10-3V;時域、頻域形式的感應(yīng)電壓都存在零點,這些特殊的頻點或時間點都與傳輸線結(jié)構(gòu)有關(guān);在含兩條導(dǎo)電脊的PCB板上,感應(yīng)電壓值要大于串?dāng)_電壓值。
[Abstract]:Due to the worsening of the electromagnetic environment, The response analysis and calculation of transmission line system under external field excitation has become an important subject in the field of computational electromagnetics and electromagnetic compatibility. In this paper, two kinds of transmission line structures-double conductor transmission lines and PCB plates with multiple conducting ridges are studied. The field-line coupling method of plane polarization wave is analyzed, and the response is analyzed and calculated by the equivalent model and the improved BLT equation. The effectiveness of the proposed method is further verified by numerical simulation. The magnitude and propagation characteristics of the plane wave excitation response are obtained, which is of practical significance for electromagnetic protection. In this paper, the space vector decomposition and distribution parameter extraction are studied through several steps of external field excitation response. The derivation of transmission line equation, the numerical technique of solving the equation and the further improvement of BLT model. The space vector decomposition of double conductor excited by plane wave is given, and the azimuth angle is used. For the PCB plate with complex structure, the general reflection coefficient is extended to the generalized reflection coefficient, and the vector decomposition form of equivalent field is obtained. The extraction of the distribution parameter is the basis of the response solution. In this paper, an analytical expression of the distribution parameters of a general type of transmission line structure is given. For a class of non-parallel transmission lines, the corresponding field quantities are determined by the integral process based on the physical meaning of the circuit parameters. The numerical calculation formula of transmission line distribution parameters is obtained. The response problem of PCB plate under plane polarization wave excitation is studied. In this paper, the PCB plate is equivalent to a multi-conductor transmission line structure, and the numerical calculation formula of the corresponding distribution parameters is given. After vector decomposition of the external field, the modified BLT model and the multi-conductor transmission line equation are used to solve the response result .4. the simulation results show that the proposed method is in time domain. The validity of the model is further verified by good fitting in frequency domain. The following conclusions are drawn: the order of response voltage generated by the excitation voltage of 1 volt on the conducting ridge of PCB is 10 ~ (-3) V, and the inductive voltage in time domain and frequency domain is zero. These special frequency points or time points are related to the transmission line structure. On the PCB plate with two conducting ridges, the inductive voltage is larger than the crosstalk voltage.
【學(xué)位授予單位】：國防科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN811;TN41

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