【摘要】：天線罩廣泛應(yīng)用于無線電各個領(lǐng)域,經(jīng)過幾十年的發(fā)展,天線罩從結(jié)構(gòu)材料,形狀等方面得到不斷發(fā)展。分析天線罩的方法主要有:高頻算法、低頻算法,以及高低頻結(jié)合算法。本課題的主要研究目標(biāo):電大尺寸(1568mm×935mm×557mm)、雙頻段天線罩,對其電性能的設(shè)計分析提供準(zhǔn)確的仿真工具。經(jīng)研究分析,本文采用兩種高頻分析方法:射線追蹤法(RT)和口徑積分-表面積分法(AISI),并完成了相關(guān)計算程序的編寫。首先,采用等效電路法分析多層介質(zhì)平板的透射、反射系數(shù),并結(jié)合CST軟件仿真,驗證了分析方法的正確性。對于外形結(jié)構(gòu)復(fù)雜的天線罩,通常難以用解析函數(shù)擬合,采用ANSYS軟件對天線罩模型剖分成諸多三角形小面元。近似每一個三角形面元為平板,采用等效平板理論分析其電性能。針對采用俯仰、方位雙軸掃描的天線,本文詳細(xì)分析了其與罩的相對位置關(guān)系。其次,本文通過對比分析RT和AISI兩種方法的計算結(jié)果與CST仿真結(jié)果,驗證所編程序的正確性。對比算例包括:在單頻段X波段,理想源天線和平板縫隙天線在帶有A夾層天線罩情況下,對比分析了程序計算結(jié)果和仿真結(jié)果在不同掃描狀態(tài)下的遠(yuǎn)區(qū)方向圖;在雙頻段X和Ka波段,對理想源陣列在A夾層天線罩情況下,算法和仿真結(jié)果進行了對比分析。結(jié)果表明:RT算法、AISI算法結(jié)果都和CST仿真結(jié)果吻合較好;帶罩陣列天線金屬面的反射對遠(yuǎn)場方向圖的透波率,和副瓣電平都有一定影響;對RT算法與AISI算法比較,RT算法的速度快于AISI算法,但精度低于AISI算法。與CST仿真軟件相比,RT算法和AISI算法可以分析和設(shè)計大尺寸、結(jié)構(gòu)復(fù)雜的天線罩。最后,對天線罩模型進行了加工,并對其進行測試,并且對平板縫隙陣列天線有無天線罩的遠(yuǎn)場方向圖進行了對比分析。其中,透波率,副瓣電平抬高等指標(biāo)基本滿足合作單位的要求。同時,根據(jù)實際測量的近場數(shù)據(jù)代入AISI算法計算的遠(yuǎn)場方向圖與實測遠(yuǎn)場方向圖進行了對比,兩者吻合較好,充分驗證的算法的正確性。
[Abstract]:Radome is widely used in various fields of radio. After decades of development, radome has been continuously developed from structural materials, shapes and so on. The main methods of analyzing radome are: high frequency algorithm, low frequency algorithm, and high and low frequency combination algorithm. The main research objectives of this paper are 1568mm 脳 935mm 脳 557mm, dual-band radome, which provides an accurate simulation tool for the design and analysis of its electrical performance. Through research and analysis, two high frequency analysis methods, ray tracing method (RT) and aperture integral-surface integration method (AISI), are used in this paper, and the related calculation programs are completed. Firstly, the equivalent circuit method is used to analyze the transmission and reflection coefficients of the multi-layer dielectric plate, and the correctness of the analysis method is verified by CST software simulation. For radome with complex shape and structure, it is usually difficult to fit by analytical function. ANSYS software is used to divide the radome model into many triangular small surface elements. Approximately each triangular element is a flat plate, and its electrical performance is analyzed by using the equivalent plate theory. For the antenna with pitching and azimuth biaxial scanning, the relative position relationship between the antenna and the cover is analyzed in detail in this paper. Secondly, the correctness of the program is verified by comparing the calculation results of RT and AISI with CST simulation results. The comparison examples include: in single band X band, ideal source antenna and flat slot antenna with A sandwich radome, the far area pattern of program calculation and simulation results in different scanning states is compared and analyzed, and in dual band X and Ka bands, the algorithm and simulation results of ideal source array in the case of A sandwich radome are compared and analyzed. The results show that the results of RT algorithm and AISI algorithm are in good agreement with the simulation results of CST. The reflection of metal surface of array antenna with mask has some influence on the transmission rate of far-field pattern and sidelobe level. Compared with AISI algorithm, the speed of RT algorithm is faster than that of AISI algorithm, but the accuracy of RT algorithm is lower than that of AISI algorithm. Compared with CST simulation software, RT algorithm and AISI algorithm can analyze and design large size and complex radome. Finally, the radome model is machined and tested, and the far-field pattern of flat slot array antenna with or without radome is compared and analyzed. Among them, the transmittance, sidelobe level elevation and other indicators basically meet the requirements of the cooperative unit. At the same time, according to the measured near-field data, the far-field pattern calculated by AISI algorithm is compared with the measured far-field pattern, which is in good agreement with each other, and the correctness of the algorithm is fully verified.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN820.81
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本文編號：2503070