【摘要】：天線罩作為雷達(dá)系統(tǒng)的重要組成部分，在現(xiàn)代通信中起到重要的作用。本畢業(yè)論文針對(duì)復(fù)雜天線罩結(jié)構(gòu)進(jìn)行了數(shù)值建模仿真，對(duì)寬頻帶天線罩進(jìn)行罩的口面場(chǎng)計(jì)算和優(yōu)化設(shè)計(jì)做了深入研究。主要?jiǎng)?chuàng)新點(diǎn)和工作如下： （1）推導(dǎo)了傳統(tǒng)的等效傳輸線理論，用于分析薄壁和多層結(jié)構(gòu)天線罩性能研究，并開發(fā)了天線罩等效平板的仿真計(jì)算軟件； （2）以等效傳輸線理論為基礎(chǔ)，詳細(xì)推導(dǎo)物理光學(xué)法相關(guān)公式理論，通過算例驗(yàn)證程序的正確性； （3）針對(duì)復(fù)雜天線罩結(jié)構(gòu)，成功地將復(fù)雜結(jié)構(gòu)網(wǎng)格建模系統(tǒng)與天線罩散射特性計(jì)算方法（物理光學(xué)法）有機(jī)結(jié)合，解決了天線罩建模的網(wǎng)格剖分問題。通過FEKO計(jì)算出天線表面近場(chǎng)得到的等效源，實(shí)現(xiàn)了任意天線-天線罩一體化系統(tǒng)的建模和仿真的全過程。該方法可操作性強(qiáng)并易實(shí)現(xiàn)，解決了工程實(shí)踐的需求； （4）開發(fā)了針對(duì)影響天線罩的電性能的介質(zhì)參數(shù)（相對(duì)介電常數(shù)、損耗角正切、罩壁結(jié)構(gòu)厚度、天線口面大小等）的遺傳算法優(yōu)化程序�；诖朔椒ú⑼ㄟ^適當(dāng)選擇頻帶范圍和入射角范圍內(nèi)的采樣點(diǎn)平均透波率作為適應(yīng)度函數(shù)，成功地進(jìn)行了寬頻帶天線罩和雙頻帶天線罩的罩壁結(jié)構(gòu)的優(yōu)化設(shè)計(jì)。
[Abstract]:As an important part of radar system, radome plays an important role in modern communication. In this thesis, the numerical modeling and simulation of complex radome structure are carried out, and the calculation and optimization of the aperture field of the wideband radome are deeply studied. The main innovations and work are as follows: (1) the traditional equivalent transmission line theory is derived, which is used to analyze the performance of thin-walled and multi-layer radome, and the simulation software of equivalent plate is developed. (2) based on the equivalent transmission line theory, the related formula theory of physical optics method is deduced in detail, and the correctness of the program is verified by an example. (3) for the complex radome structure, The mesh modeling system of complex structure is successfully combined with the scattering characteristic calculation method of radome (physical optics method) to solve the mesh generation problem of radome modeling. The equivalent source obtained from the near field of antenna surface is calculated by FEKO, and the whole process of modeling and simulation of the integrated system of arbitrary antenna and radome is realized. The method is feasible and easy to realize, and solves the need of engineering practice. (4) the dielectric parameters (relative dielectric constant, tangent loss angle, thickness of the cover wall structure) which affect the electrical performance of the radome are developed. ) genetic algorithm optimization program. Based on this method, and by selecting the average transmittance of sampling points in the range of frequency band and angle of incidence as fitness function, the optimum design of the radome wall structure of broadband radome and dual-band radome is successfully carried out.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN957.2

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