【摘要】：“Metamaterial”是21世紀(jì)物理學(xué)領(lǐng)域出現(xiàn)的一個新的學(xué)術(shù)詞匯,近年來經(jīng)常出現(xiàn)在各類科學(xué)文獻。一般文獻中都認(rèn)為metamaterial是“具有天然材料所不具備的超常物理性質(zhì)的人工復(fù)合結(jié)構(gòu)或復(fù)合材料”。因為其具有很多新奇的電磁特性,超材料就可以廣泛應(yīng)用在微波以及光學(xué)領(lǐng)域。本文通過電磁仿真軟件HFSS的仿真對超材料進行了特性研究與設(shè)計。主要工作包括:首先,針對傳統(tǒng)S參數(shù)提取法的多值性和厚度諧振問題,改進了S參數(shù)提取方法,并通過預(yù)設(shè)模型證明此方法具有普適性和精確性。其次,設(shè)計了新型共面雙L型結(jié)構(gòu)的超材料,分別構(gòu)建了這種結(jié)構(gòu)單元的等效介電常數(shù)和磁導(dǎo)率的等效電路模型,并且根據(jù)兩個電路模型推導(dǎo)出相應(yīng)的等效介電常數(shù)和等效磁導(dǎo)率的公式,并且從推導(dǎo)的公式中分析磁諧振頻率與結(jié)構(gòu)單元的各個尺寸之間的關(guān)系。再次,引入了一種S型結(jié)構(gòu)的超材料,分別構(gòu)建了這種結(jié)構(gòu)單元的磁導(dǎo)率的等效電路模型和介電常數(shù)的等效電路模型,并且從推導(dǎo)的公式中分析了磁諧振頻率與結(jié)構(gòu)單元的各個尺寸之間的關(guān)系。通過合理的調(diào)整尺寸,最終得到了負(fù)通帶寬度為6.8GHz的改進型超材料結(jié)構(gòu),是最初S型結(jié)構(gòu)負(fù)通帶帶寬的9.7倍,有效地拓寬了這種超材料的帶寬。最后,提出基于改進S型超材料結(jié)構(gòu)的同軸濾波器,將超材料結(jié)構(gòu)添加到同軸濾波器的介質(zhì)層內(nèi),利用其在頻段內(nèi)的阻帶效應(yīng),實現(xiàn)濾波器的功能。本文利用HFSS軟件對這種同軸濾波器的濾波特性進行仿真,并應(yīng)用相關(guān)理論對其原理進行深入的分析。該濾波器或可在微波工程中有廣泛的應(yīng)用前景。
[Abstract]:"Metamaterial" is a new academic term in the field of physics in the 21st century. In general literature, metamaterial is considered as "artificial composite structure or composite material with supernormal physical properties which are not possessed by natural materials". Because of its many novel electromagnetic properties, metamaterials can be widely used in microwave and optical fields. In this paper, the characteristics of metamaterials are studied and designed by the simulation of electromagnetic simulation software HFSS. The main works are as follows: firstly, the S-parameter extraction method is improved to solve the multi-value and thickness resonance problems of the traditional S-parameter extraction method, and the presupposition model is used to prove that the method is universal and accurate. Secondly, a new type of coplanar double L-type supermaterial is designed, and the equivalent circuit models of the equivalent permittivity and permeability of the structure element are constructed, respectively. According to the two circuit models, the corresponding formulas of equivalent dielectric constant and equivalent permeability are derived, and the relationship between the magnetic resonance frequency and the various dimensions of the structure unit is analyzed from the derived formulas. Thirdly, an S-type supermaterial is introduced, and the equivalent circuit model of permeability and the equivalent circuit model of permittivity are constructed, respectively. The relationship between the magnetic resonance frequency and the size of the structure element is analyzed from the derived formula. By adjusting the size reasonably, the modified supermaterial structure with the negative passband width of 6.8GHz is obtained, which is 9.7 times of the initial S-type structure's negative passband bandwidth, which effectively broadens the bandwidth of the supermaterial. Finally, a coaxial filter based on the improved S-type supermaterial structure is proposed. The supermaterial structure is added to the dielectric layer of the coaxial filter, and the function of the filter is realized by using its stopband effect in the frequency band. In this paper, the filtering characteristics of the coaxial filter are simulated by using HFSS software, and the principle of the filter is analyzed by using the relevant theory. The filter may be widely used in microwave engineering.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：O441.6;TB39

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本文編號：2406046