【作者】 刘丹丹；

【导师】 肖高标；

【作者基本信息】 上海交通大学 ， 电磁场与微波技术， 2007， 硕士

【摘要】 近年来,DGS(Defected Ground structure)在微波毫米波电路中得到广泛的应用。DGS是通过在微波电路的接地板上蚀刻出蚀刻图案(defected pattern),以改变电路衬底材料的有效介电常数,从而改变介质上的微带线的分布电容和分布电感。当我们在微带滤波器中加入了DGS结构后,微带线和接地板之间的耦合降低,谐振腔之间的耦合增强。本文的准椭圆函数滤波器体积小,结构紧凑,比契比雪夫滤波器有更好的过渡特性,更高的带外抑制,在卫星通信和移动通信中有广泛的应用前景。准椭圆窄带滤波器的技术已经很成熟,但宽带滤波器的设计还会存在一些问题。在设计带宽为10%以上的滤波器时,很多滤波器中的谐振腔之间的耦合间隙过小,比如小于0.05mm时,加工精度达不到。对于准椭圆函数滤波器来说,增加带宽就需要增强谐振器之间的耦合,可以用减小谐振器之间的间距和微带线线宽来实现。然而当谐振腔之间的间距极小时,难以加工实现。在本文中,我们通过加入DGS结构,以较宽的耦合间隙来来实现紧耦合,从而使宽带滤波器更容易设计和加工。更多还原

【Abstract】 In recent years, Defected Ground Structure(_DGS) is widely used in microwave circuit and millimeter circuit . DGS can change the effective permittivity of material and distributed capacitor and distributed inductance by etching the defected pattern on the ground of microwave circuit. Quasi-elliptic response filters are widely used in mobile and satellite communication systems for small size, light weight and compact structures.But coupling space is too small in many wideband quasi-elliptic filters. Defected Ground Structure(DGS) can increase the coupling coefficient between the resonators . DGS has been employed on the ground plane in the quasi-elliptic response filters. The coupling space has been widened to implement broadband filters. A wideband micrstrip quasi-elliptic filter with DGS has been designed using 3D EM simulate on software HFSS.更多还原