【作者】 王晓华；

【导师】 王秉中；

【作者基本信息】 电子科技大学 ， 无线电物理， 2008， 博士

【摘要】 本文主要研究了周期导波结构中的电磁特性、仿真技术及工程应用。首先总结了当前周期导波结构的研究现状和趋势,然后通过对仿真技术的研究分析了周期加载介质平行板波导的电磁特性。在工程应用研究方面主要对当前的一个研究热点——电磁带隙结构进行了研究。第一部分总结了当前在周期导波结构研究方面已经取得的成果和存在的问题,分别从周期导波结构的电磁特性、仿真技术及工程应用研究三个方面进行了介绍和比较。第二部分主要通过对仿真技术的研究来分析周期导波结构的电磁特性。首先给出了导波结构频域的模式场本征值问题方程,然后通过两种压缩后的Yee网格方法,对特征值问题方程进行了离散化。仿真算例采用了周期加载不同介质的平行板波导,结果表明方法具有很好的准确性。在这一部分还讨论了观察到的复数模对现象。第三部分主要对一种地板层型周期结构单元——开槽地板结构进行了研究。首先提出了一种基于微带的开槽地板带阻谐振器,具有结构紧凑、能抑制杂散响应等特点。和传统的哑铃型、H型和改进的哑铃型带阻滤波器相比,所提出的结构在尺寸上被极大地减小了。另外,变容二极管可以加载于地板上的开槽,这样谐振器可实现可调。其次,提出了一种基于开槽地板结构的双通带宽频带通滤波器。这种滤波器具有小尺寸、宽带宽、低插入损耗及通带频率设计灵活的特点。通过对两种特殊结构形式单元之间的相互嵌套,形成了一种新的双通带滤波器,它的两个通带可以分别被独立控制。最后,通过采用步进阻抗模型分析了开槽地板结构单元,填补了最近十年来开槽地板结构理论分析上的空白,理论分析结果和仿真结果之间误差只有10%左右。第四部分对高速电路中的电源/地板结构进行了研究,分析了地弹噪声形成的原因,从而提出了一种新颖的π型的光子带隙电源/地板结构,它可以抑制300MHz-6GHz超宽带范围内的地弹噪声,几乎实现了整个噪声频段的噪声抑制。另外,一种改进型的电源/地板结构被提出并进一步提高了低频端的抑制范围。第五部分对全文进行了总结,并对下一步的工作进行了展望。更多还原

【Abstract】 In this Dissertation, electromagnetic characteristics, simulation techniques and engineering applications of periodic guided wave structures are mainly investigated. The current research status and trends of periodic guided wave structures are summarized firstly. Then, by the research of simulation techniques, the electromagnetic characteristics of parallel plate waveguides loaded with periodic substrates are investigated. In engineering applications, electromagnetic bandgap structures, a current research hot spot, are researched.In the first part, the current achievements and existent problems in the periodic guided wave structures are summarized, and the researches in electromagnetic characteristics, simulation techniques and engineering applications are introduced and compared, respectively.In the second part, the electromagnetic characteristics are investigated by the research of simulation techniques. Eigen equations of mode fields in guided wave structures are given in frequency domain firstly. Then, these equations are discritized by two condensed Yee’s cell methods. The simulation examples are the parallel plate waveguides loaded with different periodic substrates. From the simulated results, it can be shown that these methods have good accuracy. In this part, the observed complex mode pairs are discussed.In the third part, a ground plane type periodic cell, slotted ground structure, is investigated. First, a microstrip bandstop resonator with slotted ground structure is proposed featuring compactness and suppression of spurious response. Compared with the traditional dumbbell-, H-, and modified dumbbell-shaped slotted ground structures, the size of the proposed structure is reduced greatly. Additionally, the varactor could be embedded in the slot of the ground, so the last resonator would be tunable. Second, a dualband wideband bandpass filter based on slotted ground structure is proposed featuring compactness, broadband, low insertion loss and flexibility to the passbands. By embedding the two special cells each other, a new dualband bandpass filter is gotten. The two passbands could be selected independently. Finally, the slotted ground structure is analyzed by using stepped impedance model. It supplies a gap in the analysis of slotted ground structures in theory. And there are only about 10% relative errors between the theoretic and simulated results.In the forth part, the power/ground structures in high speed circuits are investigated. By analyzing the existence reasons of ground bounce noise, a novelπ-bridged power/ground structure with photonic bandgap is proposed. The ground bounce noise could be suppressed in an ultra wideband from 300MHz to 6GHz, almost the whole noise frequency band. And an improved power/ground structure is proposed to improvethe performance in the lower frequency band further.In the fifth part, we summarize the whole content and propose the future work.更多还原