本文選題：微帶天線　切入點(diǎn)：新型電磁材料　出處：《電子科技大學(xué)》2016年碩士論文

【摘要】：自新型電磁材料被提出以來(lái),眾多研究學(xué)者針對(duì)其開(kāi)展了大量的研究,基于其表面波帶隙和反射相位帶隙提出了多種解決天線增益或極化問(wèn)題的模型結(jié)構(gòu),驗(yàn)證了新型電磁材料在天線設(shè)計(jì)中所具有的獨(dú)特優(yōu)勢(shì)。電磁模型的求解多為多參數(shù)、多目標(biāo)、非線性問(wèn)題,這使得使用基礎(chǔ)數(shù)值方法對(duì)其進(jìn)行求解存在相當(dāng)?shù)碾y度,而基于達(dá)爾文進(jìn)化論的遺傳算法能夠擺脫對(duì)實(shí)際問(wèn)題的依賴,將參數(shù)映射為算法中的個(gè)體向量,繼而通過(guò)對(duì)個(gè)體進(jìn)行適當(dāng)?shù)脑u(píng)估,最終實(shí)現(xiàn)電磁模型參數(shù)的優(yōu)化,得到符合性能指標(biāo)要求的結(jié)果。本文對(duì)當(dāng)前研究現(xiàn)狀進(jìn)行綜合闡述,基于蘑菇型電磁帶隙結(jié)構(gòu)展開(kāi)分析,將新型電磁材料結(jié)構(gòu)所具備的特殊電磁性能應(yīng)用至微帶天線中,實(shí)現(xiàn)了對(duì)天線增益性能的改善和對(duì)極化特性的轉(zhuǎn)變。本文對(duì)新型電磁材料的表面波帶隙特性進(jìn)行了研究,全面詳細(xì)分析了蘑菇型結(jié)構(gòu)中各參數(shù)對(duì)表面波帶隙特性的影響,包含對(duì)單元尺寸、貼片邊長(zhǎng)、縫隙尺寸、短路針半徑、介質(zhì)基板厚度、介質(zhì)基板介電常以及加載在微帶天線周圍的帶隙結(jié)構(gòu)單元個(gè)數(shù)的分析比較,總結(jié)了針對(duì)特定需求對(duì)模型參數(shù)進(jìn)行選取的一般原則。并基于此原則,結(jié)合改進(jìn)的遺傳算法對(duì)模型結(jié)構(gòu)參數(shù)進(jìn)行調(diào)整,設(shè)計(jì)了一種在5.8GHz表面波傳輸系數(shù)約為-9dB,具備了較優(yōu)表面波抑制特性的帶隙結(jié)構(gòu),將該結(jié)構(gòu)加載至微帶天線,將天線增益提升了1.73dB。另一方面,本文對(duì)新型電磁材料的相位反射帶隙進(jìn)行了研究,對(duì)不帶短路針的單頻帶蘑菇型新型電磁材料結(jié)構(gòu)中影響其反射相位帶隙的參數(shù)進(jìn)行了詳細(xì)分析,包含對(duì)單元尺寸、貼片邊長(zhǎng)、縫隙尺寸、介質(zhì)基板厚度、介質(zhì)基板介電常數(shù)的分析比較,總結(jié)了在設(shè)計(jì)特定頻段特定反射相位時(shí)對(duì)模型參數(shù)進(jìn)行設(shè)計(jì)和調(diào)整的一般原則。并基于此原則,展開(kāi)對(duì)雙頻帶隙結(jié)構(gòu)的分析,進(jìn)而過(guò)渡至對(duì)極化相關(guān)反射表面的分析,提出一種矩形貼片加載橢圓環(huán)挖空形式結(jié)構(gòu),并利用優(yōu)化算法對(duì)其參數(shù)進(jìn)行優(yōu)化,設(shè)計(jì)了一種對(duì)2.45GHz和5.8GHz頻段x、y向極化入射波均能進(jìn)行特定相位反射的極化相關(guān)電磁材料結(jié)構(gòu),將該結(jié)構(gòu)作為雙頻線極化微帶振子天線的反射地板,仿真得出3dB軸比帶寬達(dá)到約90MHz和180MHz,實(shí)現(xiàn)了線極化天線向圓極化的轉(zhuǎn)變。
[Abstract]:Since the new electromagnetic material was proposed, many researchers have carried out a lot of research on it. Based on the surface wave band gap and the reflected phase band gap, a variety of model structures to solve the antenna gain or polarization problem have been proposed. The unique advantages of the new electromagnetic material in antenna design are verified. The solution of electromagnetic model is mostly multi-parameter, multi-objective and nonlinear, which makes it difficult to solve the problem by using the basic numerical method. The genetic algorithm based on Darwinian evolution theory can get rid of the dependence on the actual problem and map the parameters to the individual vector in the algorithm. Then the parameters of the electromagnetic model can be optimized by the proper evaluation of the individual. The results meet the requirements of the performance index. In this paper, the current research situation is comprehensively expounded. Based on the analysis of the mushroom type electromagnetic band gap structure, the special electromagnetic properties of the new electromagnetic material structure are applied to the microstrip antenna. In this paper, the characteristics of the surface wave band gap of the new electromagnetic material are studied, and the influence of the parameters in the mushroom structure on the surface wave band gap characteristic is analyzed in detail. Including analysis and comparison of unit size, patch side length, gap size, short circuit pin radius, dielectric substrate thickness, dielectric constant of dielectric substrate, and number of bandgap structure units loaded around microstrip antenna, This paper summarizes the general principles of selecting the model parameters according to the specific requirements, and based on this principle, adjusts the structural parameters of the model with the improved genetic algorithm. A bandgap structure with a transmission coefficient of about -9dB at 5.8GHz surface wave is designed. The structure is loaded into the microstrip antenna and the antenna gain is increased by 1.73dB. on the other hand, In this paper, the phase reflection band gap of a new type electromagnetic material is studied. The parameters affecting the reflection phase band gap in the structure of a single frequency band mushroom type electromagnetic material without a short circuit pin are analyzed in detail, including the size of the unit, the length of the patch side, Through the analysis and comparison of slot size, thickness of dielectric substrate and dielectric constant of dielectric substrate, the general principles of design and adjustment of model parameters in the design of specific reflection phase in specific frequency band are summarized. Based on the analysis of the dual-band gap structure and the transition to the polarization-related reflection surface, a rectangular patch loaded elliptical annular hollowed structure is proposed, and its parameters are optimized by the optimization algorithm. In this paper, a polarization-dependent electromagnetic material structure is designed, which can reflect the polarized incident waves in the 2.45GHz and 5.8GHz bands in a specific phase. The structure is used as the reflecting floor of the dual-frequency line polarized microstrip dipole antenna. Simulation results show that the bandwidth of 3dB axis ratio reaches about 90MHz and 180MHz, which realizes the transformation from linear polarization antenna to circular polarization.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN822

【參考文獻(xiàn)】

中國(guó)期刊全文數(shù)據(jù)庫(kù) 前10條

1 趙國(guó)華;李振華;崔炳U，

本文編號(hào)：1682128