本文選題：CST電磁軟件 + 多目標(biāo)粒子群算法　； 參考：《江蘇科技大學(xué)》2014年碩士論文

【摘要】：作為寬帶天線中的一種，平面螺旋天線發(fā)展迅速，因其具有寬頻帶、圓極化、結(jié)構(gòu)簡單、低剖面、體積小、造價低等優(yōu)點，已被廣泛的應(yīng)用于國防領(lǐng)域和移動通信領(lǐng)域。目前平面螺旋天線主要的發(fā)展趨勢是寬頻帶，體積小，功耗低。本文就寬頻帶平面螺旋天線的小型化設(shè)計方法進行了討論研究。 本文的主要研究工作歸納如下： (1)提出了一種新穎的阿基米德螺旋天線小型化自動設(shè)計方法。以MATLAB軟件為基礎(chǔ)，將MOPSO算法與電磁仿真仿真軟件CST結(jié)合起來實現(xiàn)對阿基米德螺旋天線的優(yōu)化設(shè)計，使其達到了口徑小型化設(shè)計的要求。仿真優(yōu)化表明該方法可行，且在優(yōu)化過程中無需人為干涉。與傳統(tǒng)阿基米德螺旋天線相比，在保證阻抗特性和圓極化特性條件下，利用此方法設(shè)計的天線口徑面積減小了37%，達到口徑小型化設(shè)計的目的。 (2)按照項目要求完成了超寬帶平面螺旋天線小型化及其饋電巴倫的設(shè)計。采用新穎的二次型平面螺旋天線為原型進行設(shè)計，，仿真結(jié)果表明設(shè)計的二次型平面螺旋天線的低端工作頻率明顯低于傳統(tǒng)的阿基米德螺旋天線和等角螺旋天線，其口徑尺寸僅為52mm，符合小型化設(shè)計的要求，但其軸比帶寬不能滿足預(yù)期指標(biāo)。通過在末端螺旋臂之間加載電阻擴展了其軸比帶寬。仿真結(jié)果表明加寬帶巴倫后的二次型平面螺旋天線可以工作在2-18GHz的頻段內(nèi)，且其各項指標(biāo)均已滿足預(yù)期要求。 (3)研究了介質(zhì)埋藏型阿基米德螺旋天線，該天線具有相對較低和平穩(wěn)的輸入阻抗，十分利于阻抗匹配。以介質(zhì)埋藏型阿基米德螺旋天線為原始模型，對該天線進行低剖面設(shè)計。設(shè)計過程中采用新穎的帶狀線饋電方式，仿真結(jié)果表明該饋電方式下阿基米德螺旋天線仍具有良好阻抗特性，且天線整體的縱向尺寸僅為介質(zhì)板的厚度。與傳統(tǒng)的巴倫饋電方式相比，縱向尺寸大大減小，實現(xiàn)了阿基米德螺旋天線的低剖面設(shè)計（縱向尺寸小型化設(shè)計）。
[Abstract]:As a kind of broadband antenna, planar spiral antenna has been widely used in the field of national defense and mobile communication because of its advantages of wide band, circular polarization, simple structure, low profile, small volume and low cost. At present, the main development trend of planar helical antenna is wide band, small size and low power consumption. In this paper, the miniaturization design method of wide band planar helical antenna is discussed. The main research work of this paper is summarized as follows: A novel automatic miniaturization design method of Archimedes helical antenna is presented. Based on the MATLAB software, the optimization design of Archimedes spiral antenna is realized by combining the MOPSO algorithm with the electromagnetic simulation software CST, which meets the requirements of the miniaturization design of the aperture. The simulation results show that the method is feasible and does not require human interference in the optimization process. Compared with the conventional Archimedes spiral antenna, the aperture area of the antenna designed by this method is reduced by 37% under the condition of keeping the impedance and circular polarization characteristics, and the aperture miniaturization is achieved. According to the requirements of the project, the miniaturization of the UWB planar helical antenna and the design of the feed Barron are completed. A novel quadratic planar helical antenna is used as the prototype. The simulation results show that the working frequency of the designed planar helical antenna is obviously lower than that of the traditional Archimedes spiral antenna and the equiangular helical antenna. Its aperture size is only 52 mm, which meets the requirement of miniaturization design, but its axle ratio bandwidth can not meet the expected target. The shaft ratio bandwidth is expanded by loading resistance between the end spiral arms. The simulation results show that the quadratic planar helical antenna with broadband Barron can work in the frequency band of 2-18GHz, and all of its specifications have met the expected requirements. The dielectric buried Archimedes helical antenna is studied. The antenna has relatively low and stable input impedance, which is very convenient for impedance matching. The medium buried Archimedes helical antenna is used as the original model to design the low profile of the antenna. In the design process, a novel strip feed is used. The simulation results show that the Archimedes spiral antenna still has good impedance characteristics, and the whole longitudinal size of the antenna is only the thickness of the dielectric plate. Compared with the traditional Barron feed mode, the longitudinal dimension is greatly reduced, and the low profile design of the Archimedes spiral antenna is realized (the longitudinal dimension is miniaturized).
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN823.31

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