本文選題：固態(tài)等離子體　切入點：SPiN二極管　出處：《西安電子科技大學》2015年碩士論文

【摘要】：一定條件下的固態(tài)等離子體具有類金屬性,采用橫向SPiN二極管構造的固態(tài)等離子體可重構天線,可同時實現(xiàn)頻率與方向圖重構且與微電子工藝兼容,是實現(xiàn)天線小型化和提升雷達與通信系統(tǒng)性能的有效技術途徑,已經(jīng)成為了國內外的研究熱點。本文重點針對固態(tài)等離子體可重構天線應用,分析了橫向PiN二極管工作方式、載流子微觀輸運機制以及固態(tài)等離子體產(chǎn)生機理,建立了描述固態(tài)等離子體基本特性的參數(shù)模型,揭示了電磁波在固態(tài)等離子體中的傳輸機制與特性,以及等離子體頻率是固態(tài)等離子體的固有屬性,固態(tài)等離子體濃度下限為1016cm-3,當濃度達到1018cm-3時,具有類金屬性,可以用來制作固態(tài)等離子體天線。采用有效質量的修正方法,研究建立了固態(tài)等離子體介電常數(shù)、折射率、反射系數(shù)等關鍵電磁參數(shù)隨電磁波頻率和固態(tài)等離子體濃度的變化關系。仿真結果表明,介電常數(shù)的實部隨電磁波頻率變化不大,隨著固態(tài)等離子體濃度的增加開始保持不變,當濃度達到1018cm-3后迅速下降,虛部隨著電磁波頻率的增加而下降,隨著固態(tài)等離子體濃度的增加而增加;折射率的實部隨著固態(tài)等離子體濃度的增加而增加,隨著電磁波頻率的增加而下降,虛部和實部的變化規(guī)律相同;反射系數(shù)隨著電磁波頻率的增加而下降,隨著固態(tài)等離子體濃度的增加而增大;趨膚深度隨著固態(tài)等離子體濃度的增加而下降,隨著電磁波的頻率的升高而下降。根據(jù)實際情況,考慮由于雙極擴散和載流子之間的散射等非理想效應引起固態(tài)等離子體碰撞頻率的改變,進一步對固態(tài)等離子體關鍵物理參數(shù)隨電磁波頻率和固態(tài)等離子體濃度的變化關系模型進行了修正,仿真結果表明,非理想效應下,各參數(shù)的變化趨勢基本相同,但是介電常數(shù)、折射率和反射系數(shù)的值都會有所下降,介電常數(shù)下降約2-3個數(shù)量級,折射率下降約1個數(shù)量級,反射系數(shù)下降很小,而趨膚深度卻稍有增加。在以上研究的基礎上,設計并實現(xiàn)了固態(tài)等離子體SPiN二極管,優(yōu)化了工藝實現(xiàn)方案,由該二極管設計了一款頻率可重構偶極子天線,仿真結果表明,此天線可以在19.9GHz,14GHz,11.7GHz工作頻率下切換,具有可重構特征,目前該天線已經(jīng)制備完成,正在進行測試。
[Abstract]:The solid state plasma under certain conditions has the similar gold property. The solid state plasma reconfigurable antenna constructed by transverse SPiN diode can realize the frequency and pattern reconstruction at the same time and be compatible with the microelectronic process. It is an effective technical way to realize antenna miniaturization and improve the performance of radar and communication system. It has become a research hotspot at home and abroad. This paper focuses on the application of solid state plasma reconfigurable antenna and analyzes the working mode of transverse PiN diode. The transport mechanism of carriers and the generation mechanism of solid-state plasma are discussed. The parametric model describing the basic characteristics of solid-state plasma is established, and the transmission mechanism and characteristics of electromagnetic wave in solid-state plasma are revealed. And the plasma frequency is the inherent property of solid plasma. The lower limit of solid plasma concentration is 1016cm-3. When the concentration reaches 1018cm-3, it has a metalloid property, which can be used to fabricate solid-state plasma antenna. The relationship between the dielectric constant, refractive index and reflection coefficient of solid state plasma with the frequency of electromagnetic wave and the concentration of solid state plasma is established. The simulation results show that the real part of dielectric constant does not change with the frequency of electromagnetic wave. With the increase of the concentration of solid plasma, the concentration of solid plasma keeps constant. When the concentration reaches 1018cm-3, the imaginary part decreases with the increase of the frequency of electromagnetic wave and increases with the increase of the concentration of solid plasma. The real part of refractive index increases with the increase of the concentration of solid plasma, and decreases with the increase of the frequency of electromagnetic wave, the variation of imaginary part and real part is the same, and the reflection coefficient decreases with the increase of frequency of electromagnetic wave. With the increase of solid plasma concentration, the skin depth decreases with the increase of solid plasma concentration, and decreases with the increase of electromagnetic wave frequency. Considering the change of collision frequency of solid state plasma due to non-ideal effects such as bipolar diffusion and carrier scattering, Furthermore, the model of the relationship between the key physical parameters of solid-state plasma and the electromagnetic wave frequency and the concentration of solid-state plasma is modified. The simulation results show that the variation trend of each parameter is basically the same under the non-ideal effect. But the values of dielectric constant, refractive index and reflection coefficient will all decrease by about 2-3 orders of magnitude, and the refractive index will decrease by about 1 order of magnitude, and the reflection coefficient will decrease very little. On the basis of the above research, a solid-state plasma SPiN diode is designed and realized, and the process scheme is optimized. A frequency reconfigurable dipole antenna is designed by the diode. The simulation results show that, The antenna can be switched at the operating frequency of 19.9GHz / 14GHz and has reconfigurable features. At present, the antenna has been prepared and is being tested.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN312.4

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