本文選題：太赫茲 + 液晶��； 參考：《哈爾濱理工大學(xué)》2017年碩士論文

【摘要】：超材料,曾被美國(guó)《科學(xué)》雜志評(píng)為過(guò)去十年人類(lèi)最重大的十項(xiàng)科技突破之一。隨著信息技術(shù)的高速發(fā)展,超材料逐漸進(jìn)入應(yīng)用層面。由于超材料的超常電磁特性主要由人工設(shè)計(jì)的周期性結(jié)構(gòu)單元的形狀和物理尺寸決定,一旦結(jié)構(gòu)參數(shù)確定,其表現(xiàn)出的電磁性質(zhì)被局限住。所以,研究者們?cè)絹?lái)越關(guān)注可調(diào)諧超材料研究。液晶由于其介電常數(shù)可以通過(guò)外加電壓進(jìn)行控制,因而非常適合用來(lái)調(diào)諧太赫茲超材料的電磁特性�；谏鲜鲈�,本文提出兩種基于液晶調(diào)諧的太赫茲超材料濾波器�；谝壕д{(diào)諧的太赫茲超材料窄帶濾波器,其結(jié)構(gòu)單元由周期性金屬圓環(huán)深槽結(jié)構(gòu)組成,并且將液晶注入深槽結(jié)構(gòu)中用以實(shí)現(xiàn)調(diào)諧功能。使用基于有限元方法的仿真軟件對(duì)濾波器結(jié)構(gòu)單元的內(nèi)外半徑,金屬厚度等參數(shù)進(jìn)行優(yōu)化,得到性能較好的窄帶濾波器。通過(guò)TE波、TM波和對(duì)入射電磁波角度的改變,證實(shí)濾波器可實(shí)現(xiàn)廣角入射工作,不受入射波偏振狀態(tài)影響,在深槽結(jié)構(gòu)中注入DFLC液晶和LC1825液晶,比較兩種液晶材料對(duì)濾波器的頻率選擇范圍和相位變化的影響�；谝壕д{(diào)諧的太赫茲寬帶阻超材料濾波器,該結(jié)構(gòu)是一種相同結(jié)構(gòu)但不同比例尺寸閉合方形金屬諧振環(huán)結(jié)構(gòu)的多層超材料疊加而成,并且在兩石英襯底間填充液晶用以實(shí)現(xiàn)調(diào)諧功能。使用基于有限元方法的仿真軟件對(duì)該濾波器結(jié)構(gòu)的閉合方形金屬諧振環(huán)的大小、線寬、結(jié)構(gòu)厚度等參數(shù)進(jìn)行優(yōu)化,得到性能較好的寬帶阻濾波器,并對(duì)濾波器工作時(shí)的表面電流和磁場(chǎng)進(jìn)行分析。探究入射波的偏振狀態(tài)和入射角度對(duì)該太赫茲超材料濾波器的性能影響,分析所提出的寬帶濾波器的性能:該超材料寬帶濾波器頻率選擇范圍達(dá)到了563.2GHz,帶阻內(nèi)的帶內(nèi)抑制達(dá)到了95%以上,并且?guī)ё璧纳仙睾拖陆笛氐亩盖投确謩e為1000%/THz,857%/THz。
[Abstract]:Metamaterials has been named one of the ten most important technological breakthroughs in the past ten years by American Science magazine. With the rapid development of information technology, metamaterials have gradually entered the application level. Because the supernormal electromagnetic properties of the supermaterials are mainly determined by the shape and physical size of the periodically designed structural units, once the structural parameters are determined, the electromagnetic properties of the supermaterials are limited. Therefore, researchers are paying more and more attention to the study of tunable metamaterials. Because the dielectric constant of liquid crystal can be controlled by applied voltage, it is very suitable for tuning the electromagnetic properties of terahertz supermaterials. For the above reasons, two terahertz metamaterial filters based on liquid crystal tuning are proposed. The tunable terahertz narrow band filter based on liquid crystal tuning is composed of periodic metal ring deep groove structure and the liquid crystal is injected into the deep groove structure to realize the tuning function. The parameters of the inner and outer radius and metal thickness of the structural element of the filter are optimized by using the simulation software based on the finite element method, and a narrow band filter with better performance is obtained. By means of te wave TM wave and the change of incident electromagnetic wave angle, it is proved that the filter can realize wide-angle incident operation without the influence of polarization state of incident wave. DFLC liquid crystal and LC1825 liquid crystal are injected into deep groove structure. The effects of two kinds of liquid crystal materials on the frequency selection range and phase change of the filter are compared. Based on the liquid crystal tunable terahertz wideband resistive material filter, the structure is a superposition of multilayer supermaterials with the same structure but different proportions of the closed square metal resonant ring structure. Liquid crystals are filled between two quartz substrates to achieve tuning. The size, linewidth and thickness of the closed square metal resonant ring of the filter structure are optimized by using the simulation software based on the finite element method, and the wideband resistive filter with better performance is obtained. The surface current and magnetic field of the filter are analyzed. The effects of polarization state and incident angle of incident wave on the performance of the terahertz supermaterial filter are investigated. The performance of the proposed wideband filter is analyzed: the frequency selection range of the UWB filter is 563.2 GHz, the in-band suppression in the band stop is more than 95%, and the rise edge and the descent edge of the band stop are respectively 1000 / THz-857 / THZ / THZ.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN713

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本文編號(hào)：2079278