本文選題：超寬帶 + 平面螺旋天線��； 參考：《江蘇科技大學(xué)》2015年碩士論文

【摘要】：平面螺旋天線是一種常見的超寬帶天線,具有頻帶寬、圓極化性能好、體積小、易于共形等優(yōu)點,已經(jīng)被廣泛的應(yīng)用在國防領(lǐng)域和移動通信領(lǐng)域。本文根據(jù)相關(guān)理論對平面螺旋天線的小型化和低剖面設(shè)計展開了研究。本文的主要研究成果可歸納如下:(1)設(shè)計了一個“等角螺旋+阿基米德螺旋+槽隙縫”的復(fù)合結(jié)構(gòu)平面螺旋天線。在天線的優(yōu)化上,設(shè)計了一種“加載雙層銅環(huán)+跨接電阻”的復(fù)合改進方式。最后,將多目標(biāo)粒子群優(yōu)化算法與電磁仿真軟件相結(jié)合,利用Matlab軟件將10臺計算機組進局域網(wǎng),用分布式并行計算方式對雙層銅環(huán)參數(shù)和電阻參數(shù)進行優(yōu)化。仿真結(jié)果表明,天線在1.1-18GHz頻段內(nèi)回波損耗小于-10dB,在0.8-18GHz頻段內(nèi)軸比小于3dB,且直徑僅為53.62mm,達(dá)到了小型化設(shè)計要求。(2)設(shè)計了一種新型的小型化超寬帶光子晶體埋藏式巴倫阻抗變換器,使用埋藏式的“指數(shù)型漸變微帶線—平行傳輸雙線”方式完成了不平衡饋線到平衡天線的轉(zhuǎn)化和阻抗匹配,并將圓柱形晶格陣列引入到了巴倫中。仿真結(jié)果表明,該光子晶體埋藏式巴倫可以在2-18GHz頻段內(nèi)進行50-130?的阻抗轉(zhuǎn)化,S11、S21參數(shù)均滿足相關(guān)指標(biāo),且尺寸僅為20mm?5mm?5mm,達(dá)到了低剖面的設(shè)計要求。(3)對天饋系統(tǒng)進行了整體仿真,由于巴倫和天線間距過小,兩者產(chǎn)生了耦合和相互干擾,使得高頻段性能惡化。針對這個問題,本文提出了基于等效電阻性表面和基于有限電導(dǎo)率層的兩種隔離方式對天饋系統(tǒng)進行了改進。(4)針對某些使用場合需要平面螺旋天線進行單向輻射的問題,本文設(shè)計了基于吸波錐的單向輻射系統(tǒng)和基于頻率選擇表面的單向輻射系統(tǒng)。仿真結(jié)果表明,兩種系統(tǒng)的S11、軸比、增益均滿足指標(biāo)要求,且系統(tǒng)整體尺寸僅為60mm?60mm?30mm,達(dá)到了小型化和低剖面的設(shè)計要求。(5)研制了天饋系統(tǒng)的實物樣機,并對天饋系統(tǒng)進行了實驗測量,測試結(jié)果和仿真結(jié)果基本一致,滿足了工程應(yīng)用的要求。
[Abstract]:Planar spiral antenna is a common ultra-wideband antenna. It has many advantages such as high frequency bandwidth, good circular polarization, small size and easy conformal. It has been widely used in the field of national defense and mobile communication. The miniaturization and low profile design of planar helical antenna are studied in this paper. The main research results of this paper can be summarized as follows: (1) A planar helical antenna with "equal angle spiral Archimedes spiral slot" is designed. In the aspect of antenna optimization, a compound improvement method of "loading double layer copper ring straddle resistance" is designed. Finally, the multi-objective particle swarm optimization algorithm is combined with electromagnetic simulation software, 10 computers are grouped into LAN by Matlab software, and the parameters of double-layer copper ring and resistance are optimized by distributed parallel calculation. The simulation results show that the echo loss in 1.1-18GHz band is less than -10 dB, the axial ratio in 0.8-18GHz band is less than 3 dB, and the diameter is only 53.62 mm, which meets the miniaturization design requirement.) A new miniature ultra-wideband photonic crystal buried Barron impedance converter is designed. The transformation and impedance matching between the unbalanced feeder and the balanced antenna are accomplished by using the buried "exponential gradual microstrip line-parallel transmission two-wire" method, and the cylindrical lattice array is introduced into Barron. The simulation results show that the photonic crystal buried Barron can be carried out in the 2-18GHz band 50-130? The parameters of S11 / S21 are all up to the relevant indexes, and the size is only 20mm / 5mm / 5mm, which meets the design requirement of low profile. The whole simulation of the antenna feed system is carried out. Because of the small spacing between Barron and antenna, the coupling and mutual interference between the two systems are produced. Make the performance of high frequency band deteriorate. In order to solve this problem, two isolation methods based on the equivalent resistance surface and the finite conductivity layer are proposed to improve the antenna system. In this paper, unidirectional radiation system based on absorbing cone and unidirectional radiation system based on frequency selective surface are designed. The simulation results show that the S11, axle ratio and gain of the two systems meet the requirements of the index, and the overall size of the system is only 60 mm / 60 mm / 30 mm, which meets the design requirements of miniaturization and low profile. The test results are consistent with the simulation results, which meet the requirements of engineering application.
【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】：2015
【分類號】：TN822.8

【參考文獻】

相關(guān)期刊論文 前2條

1 宋朝暉,邱景輝,張勝輝,劉志惠,楊彩田;一種平面等角螺旋天線及寬頻帶巴倫的研究[J];制導(dǎo)與引信;2003年02期

2 王亞偉;王光明;梁建剛;;新型低剖面阿基米德螺旋天線設(shè)計[J];微波學(xué)報;2012年04期

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本文編號：1964585