本文選題：電磁帶隙 + Bowtie天線��； 參考：《華北電力大學(xué)(北京)》2017年碩士論文

【摘要】：近年來(lái),隨著電子通信技術(shù)的高速發(fā)展,普通微波天線由于頻帶窄、增益低、體積大、性能差等一系列原因?qū)е缕鋺?yīng)用范圍受到嚴(yán)格限制,人工電磁材料結(jié)構(gòu)的提出無(wú)疑是改善這一類問(wèn)題的有效渠道。人工電磁材料結(jié)構(gòu)中的電磁帶隙結(jié)構(gòu)(Electromagnetic Band-gap,EBG)是該類型結(jié)構(gòu)中優(yōu)點(diǎn)最為突出的,本文以電磁帶隙結(jié)構(gòu)的電磁理論分析了帶隙結(jié)構(gòu)特性和反射相位特性,并設(shè)計(jì)了多種形式的電磁帶隙結(jié)構(gòu),同時(shí)將所設(shè)計(jì)的電磁帶隙結(jié)構(gòu)分別應(yīng)用于Bowtie天線、波導(dǎo)縫隙天線和微帶天線。首先,本文對(duì)mushroom-like EBG結(jié)構(gòu)進(jìn)行了分析,并得出其等效電路模型。利用不同的方法對(duì)該EBG結(jié)構(gòu)的反射相位特性、表面波特性、帶隙特性進(jìn)行了深入的研究分析以及對(duì)比,同時(shí)研究了不同的結(jié)構(gòu)參數(shù)對(duì)EBG結(jié)構(gòu)特性的影響。然后,基于上述對(duì)電磁帶隙結(jié)構(gòu)的研究,設(shè)計(jì)了兩種EBG結(jié)構(gòu)單元,分析了兩種EBG結(jié)構(gòu)的帶隙特性。同時(shí)也設(shè)計(jì)了微波天線中平面化程度較高的兩類天線,分別是以普通微帶天線為基礎(chǔ)的階梯型微帶天線和全向性Bowtie天線,并加載了所設(shè)計(jì)的EBG結(jié)構(gòu),使得天線的輻射性能有了明顯改善,并且有效的抑制表面波的傳播,天線的增益、帶相對(duì)寬均有所提高。Bowtie天線因是全向性天線,故其帶寬、增益等相關(guān)特性較差,本文在此基礎(chǔ)上將其修改為定向的Bowtie天線,其回波系數(shù)更優(yōu)且增益增加約2.6dB。若將所設(shè)計(jì)的EBG結(jié)構(gòu)加載到其中,則Bowtie天線的帶寬將增加5%,增益增加約5dB。非對(duì)稱脊波導(dǎo)縫隙天線相對(duì)于矩形波導(dǎo)縫隙天線而言,其尺寸僅為后者的46%,且相對(duì)帶寬和增益均優(yōu)于后者。加載復(fù)合型EBG結(jié)構(gòu)之后,兩類天線增益僅增加了0.14dB左右,但相對(duì)帶寬卻均增加了50%左右,并且具有良好的輻射方向圖。
[Abstract]:In recent years, with the rapid development of electronic communication technology, the application of ordinary microwave antenna is severely restricted due to a series of reasons, such as narrow frequency band, low gain, large volume and poor performance. The structure of artificial electromagnetic material is undoubtedly an effective channel to improve this kind of problem. The electromagnetic band gap structure (EBG) in artificial electromagnetic material structure is the most outstanding in this type of structure. In this paper, the characteristics of band gap structure and reflected phase characteristics are analyzed based on the electromagnetic theory of electromagnetic band gap structure. At the same time, the designed electromagnetic band gap structure is applied to Bowtie antenna, waveguide slot antenna and microstrip antenna respectively. Firstly, the structure of mushroom-like EBG is analyzed and its equivalent circuit model is obtained. The reflection phase characteristics, surface wave characteristics and band gap characteristics of the EBG structure are studied and compared by different methods. The influence of different structural parameters on the structure characteristics of EBG is also studied. Then, based on the above research on the electromagnetic band gap structure, two kinds of EBG structure units are designed, and the band gap characteristics of the two kinds of EBG structures are analyzed. At the same time, two kinds of planar microstrip antennas are designed, one is the stepped microstrip antenna based on the ordinary microstrip antenna and the other is the omnidirectional Bowtie antenna, and the designed EBG structure is loaded. The radiation performance of the antenna is obviously improved, and the propagation of surface wave is effectively suppressed. The gain and the relative width of the antenna are improved. Because the antenna is a omnidirectional antenna, its bandwidth, gain and other related characteristics are poor. In this paper, the directional Bowtie antenna is modified, and the echo coefficient is better and the gain is increased by about 2.6 dB. If the designed EBG structure is loaded into it, the bandwidth and gain of the Bowtie antenna will increase by 5 dB and 5 dB respectively. The size of asymmetric ridge waveguide slot antenna is only 46 of that of rectangular waveguide slot antenna, and the relative bandwidth and gain are better than the latter. After the composite EBG structure is loaded, the gain of the two kinds of antennas increases only about 0.14 dB, but the relative bandwidth increases by about 50%, and has a good radiation pattern.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN822

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 郝建紅;郭超;袁至衡;;基于非對(duì)稱脊波導(dǎo)的縫隙天線研究與設(shè)計(jì)[J];河北師范大學(xué)學(xué)報(bào)(自然科學(xué)版);2016年04期

2 袁子?xùn)|;高軍;曹祥玉;楊歡歡;楊群;李文強(qiáng);商楷;;一種性能穩(wěn)定的新型頻率選擇表面及其微帶天線應(yīng)用[J];物理學(xué)報(bào);2014年01期

3 梁樂(lè);梁昌洪;陳亮;蘇子劍;;一種電磁帶隙結(jié)構(gòu)的快速分析方法[J];強(qiáng)激光與粒子束;2008年05期

4 高初;陳志寧;王蘊(yùn)儀;楊寧;QING Xian-ming;;一種低通帶波紋的EBG帶阻濾波器[J];微波學(xué)報(bào);2006年05期

5 劉紅英;孫維;馮一軍;張明雪;王相元;;利用頻率選擇表面改善微波吸收材料S波段的吸波性能[J];微波學(xué)報(bào);2006年03期

6 歐陽(yáng)征標(biāo),李景鎮(zhèn);光子晶體的研究進(jìn)展[J];激光雜志;2000年02期

相關(guān)碩士學(xué)位論文 前3條

1 董明達(dá);新型人工電磁材料在微波器件中的應(yīng)用[D];電子科技大學(xué);2015年

2 王坤;Mushroom結(jié)構(gòu)CRLH的微波濾波器的研究[D];電子科技大學(xué);2010年

3 張?jiān)?新型超寬帶平面天線研究[D];電子科技大學(xué);2008年

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本文編號(hào)：2065618