Design of RF MEMS Based Tunable Cell for CRLH Transmission Line_英语论文.docVIP

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Design of RF MEMS Based Tunable Cell for CRLH Transmission Line_英语论文.doc

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Design of RF MEMS Based Tunable Cell for CRLH Transmission Line_英语论文

Design of RF MEMS Based Tunable Cell for CRLH Transmission Line_英语论文摘要阐述了基于RF MEMS技术的可调式复合左右手传输线单元的设计。复合左右手传输线单元的设计包括Interdigital Capacitor和Stub Inductor的设计，以在基本的传输线结构上增加除本征的串联电感和并联电容之外的串联电容和并联电感。采用CST微波工作室和AWR2009仿真，我们实现了在8GHz,9GHz, 10GHz, 11GHz 和12GHz5个频点的平衡的复合左右手传输线单元的设计。仿真结果显示该结构能很好的达到平衡传输线的要求。除此之外，通过MATLAB编程绘制色散曲线，进一步验证了传输线的特性。通过级联3个CRLH传输线单元，我们得到了零阶谐振器的设计，进一步测试了左右手传输线的特性。为了增加传输线的可调节性能，同时保持阻抗匹配和结构平衡，我们在所设计的电容和电感中引入RF MEMS开关。通过验证，开关能在on状态有较高的隔离度，off状态有较小的插入损耗。最后文章建立了基于RF MEMS开关的可调型传输线单元模型，通过开关调节电容和电感值可以完成不同状态的切换。4944 关键词RF MEMS开关叉指电容电感色散曲线S参数 Abstract This project focuses on designing a novel tunable composite right/left-handed transmission line (CRLH TL) using integrated microelectromechanical system (MEMS) switches. One unit cell of CRLH TL has been developed and simulated by EM solvers in this article, which consists of design of interdigital capacitors and stub inductors to add additional series capacitance and shunt inductance. The structure is analyzed using CST Microwave Studio (MWS) and AWR2009. We realized thebalanced unit cell of CRLH TL at the frequency point of 8GHz, 9GHz, 10GHz, 11GHz and 12GHz. In addition, dispersion curves of the 3.2.1 Design of Interdigital Capacitor16 3.2.2 Design of Stub Inductor18 3.3Design of Balanced CRLH TL.20 3.4Design of RF MEMS Switches24 3.5Model of Tunable unit Cell of CRLH TL.26 4Design of Zero Order Resonator (ZOR)27 5Problems30 6Further work.31 Conclusion .32 Acknowledgement .33 Reference .34 Appendix36 1.1Background of the Project Studies on left-handed materials(LHMs), which are characterized as exhibiting simultaneously negative permittivity(epsilon;) and permeability(mu;), have receive substantial attention in the scientific and engineering communities. They were first theoretically analyzed by the Russian Physicist Veselago. Since then, the unique properties of LHMs have allowed novel applications, concepts, and devices to be developed and started to be integrated into many microwave and