本文選題：人工磁導(dǎo)體材料(AMC)　切入點(diǎn)：低剖面　出處：《西安電子科技大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：伴隨著超材料(Metamaterials)研究的快速發(fā)展,利用各種人工電磁結(jié)構(gòu)的非常規(guī)電磁參數(shù)對(duì)傳統(tǒng)電磁器件的進(jìn)行改進(jìn)設(shè)計(jì)得到了工業(yè)界和學(xué)術(shù)界的廣泛關(guān)注。另一方面,無(wú)線(xiàn)終端設(shè)備的體積越來(lái)越小,這對(duì)終端設(shè)備中的天線(xiàn)的提出了更加苛刻的要求,天線(xiàn)的小型化設(shè)計(jì)越來(lái)越成為設(shè)計(jì)者關(guān)心的重點(diǎn)問(wèn)題。本文針對(duì)傳統(tǒng)天線(xiàn)剖面過(guò)高的問(wèn)題,利用人工磁導(dǎo)體材料(AMC)在特定頻率范圍內(nèi)所具有的零反射相位特性,提出了幾種具有低剖面特性的的小型化寬頻帶天線(xiàn)設(shè)計(jì)方案。首先,針對(duì)平面準(zhǔn)八木天線(xiàn)放置于金屬表面時(shí)由于鏡像原理導(dǎo)致的阻抗失配問(wèn)題,利用AMC結(jié)構(gòu)的零反射相位特性,設(shè)計(jì)了一種低剖面寬帶平面準(zhǔn)八木天線(xiàn)。通過(guò)在準(zhǔn)八木天線(xiàn)的輻射體下方引入AMC結(jié)構(gòu),抵消了由于鏡像原理導(dǎo)致的阻抗失配,通過(guò)選用合適的介質(zhì)基板以及天線(xiàn)尺寸,在獲取低剖面的同時(shí),在較寬的頻率范圍內(nèi)獲得了較好的阻抗匹配特性。為了驗(yàn)證設(shè)計(jì),對(duì)天線(xiàn)的實(shí)物進(jìn)行了加工測(cè)試。測(cè)試結(jié)果表明,該天線(xiàn)能夠工作在8.8 10.48 GHz,剖面低至0.14λg(λg為中心頻率對(duì)應(yīng)介質(zhì)波長(zhǎng))。同時(shí),在整個(gè)工作頻帶內(nèi),該天線(xiàn)具有37°到47°之間的波束上傾角。其次,針對(duì)傳統(tǒng)雙極化基站天線(xiàn)設(shè)計(jì)中天線(xiàn)單元剖面過(guò)高的問(wèn)題,采用AMC結(jié)構(gòu)作為雙極化天線(xiàn)的地板,對(duì)天線(xiàn)的剖面進(jìn)行了大幅度的降低,所設(shè)計(jì)的低剖面基站天線(xiàn)的剖面僅僅為傳統(tǒng)的雙極化基站天線(xiàn)剖面的一半。同時(shí),方形AMC結(jié)構(gòu)在幾何外形上的對(duì)稱(chēng)性,保證了其在低剖面雙極化天線(xiàn)中的優(yōu)良性能。利用仿真軟件對(duì)所設(shè)計(jì)的天線(xiàn)的結(jié)構(gòu)尺寸的進(jìn)行了優(yōu)化,使得天線(xiàn)可以在較寬的頻率范圍內(nèi)實(shí)現(xiàn)良好的阻抗匹配特性,最終對(duì)天線(xiàn)實(shí)物進(jìn)行了加工測(cè)試。實(shí)驗(yàn)結(jié)果表明,本文所提出的雙極化天線(xiàn)能夠在實(shí)現(xiàn)寬帶工作特性(2.12 2.77 GHz),天線(xiàn)的端口隔離度達(dá)到-35dB,天線(xiàn)的后向輻射得到一定的抑制,與普通雙極化天線(xiàn)相比,波瓣前后比提高9dB。最后,針對(duì)傳統(tǒng)的AMC結(jié)構(gòu)的帶寬和小型化之間的矛盾,在缺陷地AMC結(jié)構(gòu)的基礎(chǔ)上,提出了互補(bǔ)型AMC結(jié)構(gòu)單元。與缺陷地AMC結(jié)構(gòu)相比,互補(bǔ)型AMC結(jié)構(gòu)更加簡(jiǎn)單,更加便于優(yōu)化設(shè)計(jì)。通過(guò)電磁仿真軟件對(duì)互補(bǔ)型AMC結(jié)構(gòu)的電磁特性進(jìn)行了分析,結(jié)果證明,該種結(jié)構(gòu)能夠在實(shí)現(xiàn)AMC結(jié)構(gòu)單元小型化的同時(shí)實(shí)現(xiàn)較寬的工作帶寬。最后,通過(guò)采用互補(bǔ)型AMC結(jié)構(gòu),結(jié)合彎折單極子天線(xiàn),設(shè)計(jì)了一種低剖面寬頻帶彎折單極子天線(xiàn)。最終所設(shè)計(jì)的彎折單極子天線(xiàn)能夠在較寬的頻帶內(nèi)(4.5-5.67 GHz)實(shí)現(xiàn)良好的阻抗匹配,天線(xiàn)在整個(gè)工作頻帶內(nèi)增益大于4dBi,效率大于85%。
[Abstract]:With the rapid development of metamaterials research, the improved design of traditional electromagnetic devices using various unconventional electromagnetic parameters of artificial electromagnetic structures has attracted extensive attention in industry and academia. The size of wireless terminal equipment is becoming smaller and smaller, which puts forward more stringent requirements for antenna in terminal equipment. The miniaturization of antenna design has become an important concern of designers. In this paper, the traditional antenna profile is too high. Based on the zero-reflection phase characteristics of artificial magnetic conductor material (AMC) in a specific frequency range, several design schemes for miniaturized broadband antennas with low profile characteristics are proposed. Aiming at the impedance mismatch problem caused by the mirror image principle when the planar quasi-octagonal antenna is placed on the metal surface, the zero-reflection phase characteristic of the AMC structure is used. A low profile wideband planar quasi-octagonal antenna is designed. By introducing AMC structure under the radiator of the quasi-octagonal antenna, the impedance mismatch caused by the mirror image principle is counteracted, and the appropriate dielectric substrate and antenna size are selected. At the same time, a better impedance matching characteristic is obtained in a wide frequency range. In order to verify the design, the processing test of the antenna is carried out. The test results show that, The antenna is capable of operating at 8.8 ~ 10.48 GHz with a profile as low as 0.14 位 g (位 g is the center frequency corresponding to the dielectric wavelength). Meanwhile, the antenna has a beam-on-beam inclination angle of 37 擄to 47 擄in the whole operating frequency band. Secondly, Aiming at the problem that the antenna cell profile is too high in the traditional dual-polarization base station antenna design, the AMC structure is used as the floor of the dual-polarization base station antenna, and the antenna profile is greatly reduced. The profile of the low profile base station antenna is only half of that of the traditional dual polarization base station antenna. At the same time, the symmetry of the square AMC structure in geometry is obtained. The excellent performance of the antenna in low profile dual polarization antenna is guaranteed. The structure size of the designed antenna is optimized by using the simulation software, so that the antenna can achieve good impedance matching characteristics in a wide frequency range. The experiment results show that the dual-polarization antenna proposed in this paper can achieve the wideband operating characteristics of 2.12 ~ 2.77 GHz, and the isolation degree of the antenna is -35 dB, and the backward radiation of the antenna can be restrained to a certain extent. Compared with the conventional dual-polarization antenna, the wavefront and back lobe ratio is increased by 9 dB. Finally, in view of the contradiction between the bandwidth and miniaturization of the traditional AMC structure, a complementary AMC structure unit is proposed on the basis of the defective AMC structure, which is compared with the defective AMC structure. The structure of complementary AMC is simpler and more convenient for optimization design. The electromagnetic characteristics of complementary AMC are analyzed by electromagnetic simulation software, and the results show that, This kind of structure can realize the miniaturization of AMC structure unit and realize wide working bandwidth at the same time. Finally, by adopting the complementary AMC structure and combining with the bending monopole antenna, A broadband bending monopole antenna with low profile is designed. The designed antenna can achieve good impedance matching in a wide frequency band (4.5-5.67 GHz). The gain of the antenna is greater than 4dBiand the efficiency is more than 85GHz in the whole operating band.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN823.27

【相似文獻(xiàn)】

相關(guān)期刊論文 前8條

1 郭英杰;;低剖面盒式天線(xiàn)初探[J];西北電訊工程學(xué)院學(xué)報(bào);1982年03期

2 楊?yuàn)^華;湯煒;;一種新型的高增益低剖面天線(xiàn)[J];通信技術(shù);2013年01期

3 朱金鵬;劉小國(guó);鄧維波;朱文軍;;一種寬帶低剖面相控陣單元天線(xiàn)[J];電波科學(xué)學(xué)報(bào);2013年05期

4 鄒火兒;韓國(guó)棟;;機(jī)載低剖面衛(wèi)通天線(xiàn)的發(fā)展與未來(lái)[J];現(xiàn)代雷達(dá);2014年03期

5 劉玉龍;金元松;何紹林;;金屬多面體上低剖面天線(xiàn)的矩量法分析[J];電波科學(xué)學(xué)報(bào);2013年02期

6 牛傳峰;張瑞東;張德;劉昕;米宏偉;陳輝;;車(chē)載低剖面陣列動(dòng)中通天線(xiàn)設(shè)計(jì)[J];中國(guó)電子科學(xué)研究院學(xué)報(bào);2013年04期

7 田敬波;;低剖面動(dòng)中通天線(xiàn)發(fā)展現(xiàn)狀與趨勢(shì)[J];電信技術(shù);2012年08期

8 ;[J];;年期

相關(guān)碩士學(xué)位論文 前2條

1 劉玉龍;金屬多面體上低剖面天線(xiàn)的特性研究[D];中國(guó)電波傳播研究所;2007年

2 任建;人工磁導(dǎo)體材料在低剖面天線(xiàn)設(shè)計(jì)中的應(yīng)用研究[D];西安電子科技大學(xué);2014年

，

本文編號(hào)：1603668