新型人工周期结构的特性研究及应用

发布时间：2018-04-05 05:23

本文选题：人工周期结构　切入点：电磁带隙　出处：《南京理工大学》2015年博士论文

【摘要】：针对现代电子信息系统工作时所面临的内部噪声(导行波)和外部空间波的抑制问题,本论文深入研究了包含电磁带隙(Electromagnetic Bandgap,EBG)和频率选择表面(Frequency Selective Surface,FSS)在内的两类人工周期结构的电磁特性,以期实现它们在上述问题中的应用。按照EBG和FSS的分类,本论文依次提出了C-EBG、耦合C型槽线EBG、SC-EBG、三维打印十字架型EBG、基于2.5维闭合环的FSS以及三维打印方形同轴线型FSS,具体内容包括:(1)提出C-EBG结构,将其应用于电源地平面,能够有效抑制更低频率的电源地噪声,通过等效电路模型和色散图模式分析对其阻带机理进行了物理解释,研究了旋转不对称性对其噪声抑制性能的影响,给出了其频域和时域噪声抑制性能。(2)提出耦合C型槽线EBG结构,将其应用于差分传输线的参考地平面,能够抑制宽频带的共模噪声,对其进行了奇偶模等效电路分析,通过偶模等效电路模型研究了不同耦合方式对其共模噪声抑制阻带的影响。(3)在C-EBG基础上提出了 SC-EBG结构,通过加载金属柱有效增大了原始C-EBG周期单元的等效电容,缩小了周期单元的电尺寸,且由于金属柱的引入,构造了更为复杂紧凑的高阶模式谐振腔,从而在降低噪声抑制阻带下截止频率的同时,也提高了阻带上截止频率,进一步展宽了阻带带宽。(4)将三维打印技术引入到EBG封装屏蔽盒的设计中,提出十字架型3-D EBG以抑制封装内的平行平板噪声,该十字架型3-D EBG能够同时增大周期单元的等效电容和等效电感,展宽阻带带宽和缩小周期单元电尺寸。(5)提出基于2.5维闭合环的带阻型FSS,在其周期单元内通过4个金属化过孔将位于衬底上下层正交放置的两对开口方向相对的C型环首尾相连,构成2.5维闭合环结构,有限周期单元尺寸内增加的闭合环周长显著减小了 FSS周期单元的电尺寸,通过等效电路建模对其小型化的机理进行了物理解释。(6)进一步,基于三维打印技术,提出方形同轴线型3-D FSS,该3-D FSS给入射电磁波提供了两条传播路径,利用其多传输零极点的特性提高了方形同轴线型FSS通带边缘的陡峭性,增强了高频带外抑制性能。
[Abstract]:Aiming at the problem of internal noise (guided traveling wave) and external space wave suppression in modern electronic information system,In this paper, the electromagnetic characteristics of two kinds of artificial periodic structures, including electromagnetic band gap (EBG) and frequency-selective surface frequency Selective surface (FSS), are studied in order to realize their application in the above problems.According to the classification of EBG and FSS, this paper puts forward C-EBG, coupled C-slot EBG-SC-EBG, 3D printed cross EBG, FSS based on 2.5-dimensional closed loop and three-dimension printing square coaxial line, including the structure of C-EBG.Applying it to the ground plane of the power supply can effectively suppress the noise of the lower frequency power source. The stopband mechanism is explained by the equivalent circuit model and the dispersion pattern analysis.In this paper, the effect of rotational asymmetry on noise suppression performance is studied. The noise suppression performance in frequency domain and time domain is given. The coupled C-slot EBG structure is proposed and applied to the reference ground plane of differential transmission line.The common-mode noise can be suppressed in a wide band, and the odd-even mode equivalent circuit is analyzed. The influence of different coupling modes on the suppression stopband of the common-mode noise is studied by using the even-mode equivalent circuit model. The SC-EBG structure is proposed on the basis of C-EBG.By loading the metal column, the equivalent capacitance of the original C-EBG periodic element is increased effectively, and the electric size of the periodic element is reduced. Because of the introduction of the metal column, a more complex and compact high-order mode resonator is constructed.Thus, while reducing the noise suppression stopband cutoff frequency, it also improves the stopband cut-off frequency, and further broadens the stopband bandwidth. (4) Three-dimensional printing technology is introduced into the design of EBG packaging shielding box.The cross 3-D EBG is proposed to suppress the parallel plate noise in the package. The cross 3-D EBG can increase the equivalent capacitance and inductance of the periodic unit at the same time.Broadening the stopband bandwidth and reducing the electrical size of the periodic unit. (5) A band-stop FSS based on a 2.5 dimensional closed ring is proposed, in which two pairs of C-shaped rings with opposite opening directions located at the top and bottom layers of the substrate are connected through four metallized holes in the periodic unit.A 2.5-dimensional closed ring structure is constructed. The increase in the circumference of the closed ring within the size of the finite periodic element significantly reduces the electrical size of the FSS periodic unit. The mechanism of miniaturization is explained by the equivalent circuit modeling.Based on 3D printing technology, a square coaxial 3-D FSS is proposed. The 3-D FSS provides two propagation paths for incident electromagnetic waves, and the steepness of the edge of square coaxial FSS passband is improved by using its multi-transmission zero-pole characteristic.The performance of high frequency out-band suppression is enhanced.
【学位授予单位】：南京理工大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TN03

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