本文選題：傳輸線理論　切入點(diǎn)：平面電磁波　出處：《北京交通大學(xué)》2014年博士論文

【摘要】：摘要：為了抵抗電磁干擾對(duì)電子設(shè)備的影響,電磁屏蔽正不斷發(fā)展起來(lái),并廣泛應(yīng)用于各個(gè)領(lǐng)域。雖然現(xiàn)在有很多數(shù)值方法可以得到較為精確的電磁仿真數(shù)據(jù),但其耗費(fèi)時(shí)間長(zhǎng),CPU的計(jì)算量大。因此,應(yīng)用解析法建立完善的電磁屏蔽模型正逐漸成為指導(dǎo)工程實(shí)踐的快捷有效的方法。 本文以光纖陀螺尋北儀為研究對(duì)象,應(yīng)用解析法中的傳輸線理論,對(duì)實(shí)際工程中出現(xiàn)的典型屏蔽腔體分別進(jìn)行了較為完整的建模。其中包括單層帶孔縫腔體、雙層帶孔縫腔體、雙面帶孔縫腔體以及內(nèi)置PCB板的腔體,并求解出了其中任意點(diǎn)的屏蔽效能,為工程實(shí)踐中屏蔽腔體和孔縫的設(shè)計(jì),及其內(nèi)部器件的安排布局提供了很好的參考價(jià)值。論文的主要工作和創(chuàng)新如下： 1.針對(duì)平面電磁波以任意角度射入腔體的實(shí)際情況,提出在建模中引入平面電磁波的豎直入射角、水平入射角與極化角的方法。把平面電磁波的坐標(biāo)從入射源坐標(biāo)系轉(zhuǎn)換到矩形腔坐標(biāo)系,并按照電磁波的水平極化分量和垂直極化分量分別對(duì)模型進(jìn)行分析研究。此建模方法使得平面電磁波可以以任意角度射入腔體,增強(qiáng)了模型對(duì)實(shí)際情況的擬合性。 2.針對(duì)孔縫處于腔體面的任意位置的實(shí)際情況,提出把孔縫建模成寬度不對(duì)稱的共面帶狀線的方法。應(yīng)用在平面電磁波輻射下的分布電源傳輸線模型對(duì)孔縫進(jìn)行建模,并求出在孔縫中心處產(chǎn)生的等效電壓,以此電壓做為后續(xù)電路的電壓源。此建模方法節(jié)省了計(jì)算時(shí)間,把孔縫從腔體面的中心位置擴(kuò)展到了任意位置,擴(kuò)大了模型對(duì)工程實(shí)踐的適用性。 3.針對(duì)探測(cè)點(diǎn)處于矩形腔內(nèi)任意位置的實(shí)際情況,提出結(jié)合模式電壓和模式電流來(lái)表示矩形諧振腔內(nèi)電磁場(chǎng)分布的方法。把矩形腔體看成一端完全開(kāi)放,另一端完全封閉的矩形波導(dǎo)。此波導(dǎo)與孔縫相結(jié)合,應(yīng)用集總電源傳輸線模型進(jìn)行分析,考慮TE模和TM模的高次模影響,并結(jié)合腔體內(nèi)的電場(chǎng)分布,求解出腔體內(nèi)任意點(diǎn)的屏蔽效能。此建模方法把探測(cè)點(diǎn)從腔體內(nèi)孔縫中心線上的點(diǎn)擴(kuò)展到了腔體內(nèi)的任意點(diǎn),增強(qiáng)了模型的工程實(shí)踐價(jià)值。 4.針對(duì)光纖陀螺尋北儀,依照以上建模方法,分別建模求取了單層、雙層和三層帶孔縫腔體的屏蔽效能。并研究了帶孔縫腔體內(nèi)屏蔽效能與探測(cè)點(diǎn)位置之間的關(guān)系以及腔體層數(shù)與屏蔽效能之間的關(guān)系。仿真結(jié)果表明：此模型得出的屏蔽效能值與實(shí)驗(yàn)測(cè)得的數(shù)據(jù)相吻合,證明了此模型的正確性。腔體的屏蔽效能隨探測(cè)點(diǎn)的位置不同而不同,且均隨腔體層數(shù)的增加而有所提高。為工程實(shí)踐中對(duì)屏蔽效能要求比較高的設(shè)備或系統(tǒng)提供了很好的參考價(jià)值。 5.針對(duì)光纖陀螺尋北儀,研究了在平面電磁波照射下的雙側(cè)面帶孔縫的矩形腔以及內(nèi)置PCB板的帶孔縫矩形腔體的建模,并求出了腔體內(nèi)任意點(diǎn)的屏蔽效能。仿真結(jié)果表明：腔體的屏蔽效能隨探測(cè)點(diǎn)的位置不同而不同,此建模方法具有一定的工程實(shí)踐價(jià)值。
[Abstract]:Abstract: in order to resist the electromagnetic interference of electronic equipment, electromagnetic shielding is constantly developed and widely used in various fields. Although there are many numerical methods for electromagnetic simulation can get more exact data, but it takes a long time, CPU has large amount of calculation. Because of this, the analytic method is used to establish the model to improve the electromagnetic shielding it has gradually become a quick and effective way to guide the engineering practice.
The fog north finder as the research object, using the analytical method of transmission line theory, the typical shielding cavity in the actual project were established relatively complete. Including the single cavity with apertures, double cavity with apertures, with double cavity with aperture cavity and built-in PCB board. And calculate the shielding effectiveness of the shielding design for any point, the engineering practice of cavity and aperture, and the internal device layout provides a very good reference value. The main work and innovation are as follows:
1. according to the actual situation of plane electromagnetic wave with arbitrary incident angle of the cavity, introduced into the vertical incident plane electromagnetic waves in the modeling method of horizontal angle, incident angle and polarization angle. The coordinates of plane electromagnetic wave incident from the source coordinates to rectangular cavity coordinates, and in accordance with the analysis of electric magnetic wave horizontal polarization component and vertical polarization components are respectively the model. The modeling method of the plane electromagnetic waves at an arbitrary angle into the cavity, enhance the fit of the model to the actual situation.
2. according to the actual situation in the slot cavity at any position of the decent, put forward the modeling method of slot width of asymmetric coplanar stripline. The distribution of power transmission line model is applied in the plane electromagnetic wave radiation to simulate the aperture, and calculated the joint effect voltage generated at the center of the hole, this voltage as the voltage source follow circuit. This modeling method saves the computing time, the slot extends from the center to the position of cavity surface at any position, expand the applicability of the model in engineering practice.
3. according to the actual situation in any position detecting points in rectangular cavity, combining with the mode voltage and mode current to represent the electromagnetic field distribution of rectangular resonant cavity. The rectangular cavity as is completely open, the other end of the rectangular waveguide is completely enclosed. The waveguide and slot combination application of lumped power transmission line model were analyzed. Considering the influence of higher modes of TE mode and TM mode, and combined with the electric field distribution inside the cavity, calculate the shielding effectiveness of the cavity at any point. This modeling method the detection point from the cavity hole center line point is extended to an arbitrary point within the cavity, enhances the model of engineering practice.
4. for the fog north seeker, in accordance with the above modeling methods, modeling for single layer, double layer and three layer cavity with apertures on the shielding effectiveness. And to study the relationship between the joint relationship between cavity shielding effectiveness and detecting position and number of layers and the shielding cavity with holes. The simulation results show that: the shielding effectiveness value derived from the model are in good agreement with the experimental measured data, prove the correctness of this model. The shielding effectiveness of the cavity with the detecting point is different, and the increase of the number of the cavity is improved. It provides a good reference value for the engineering practice of shield efficiency requirements high equipment or system.
5. for the fog north seeker, on the side of the double plane electromagnetic wave irradiation with apertures of the rectangular cavity and a built-in PCB plate with apertures of the rectangular cavity model, and calculate the shielding effectiveness of the cavity at any point. The simulation results show that the shielding effectiveness of the cavity with different detecting point and different, this modeling method has a certain practical value.

【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN96

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