阶跃阻抗微波低通滤波器毕业设计与仿真论文.docVIP

 PAGE \* MERGEFORMAT 40 (此文档为word格式，下载后您可任意编辑修改！) 阶跃阻抗微波低通滤波器设计与仿真 设计总说明 微波滤波器在无线通信系统中至关重要，起到频带和信道选择的作用，并且能滤除谐波，抑制杂散。在射频电路设计时，经常会用滤波器从各种信号中提取出想要的频谱信号。Angilent ADS 软件可以支持从模块到系统设计，能够完成微波电路设计、通信系统设计、射频集成电路设计，因此是当前射频和微波电路设计的首选工程软件。 本文主要用三种方法达到了任务书的要求，其具体参数指标为截止频率=2.5GHz;在=4GHz处的插入损耗大于20dB;输入输出阻抗为50，依据理论是巴特沃兹、切比雪夫、Richards变换与Kuroda规则，并得出了三种方法设计的滤波器。利用滤波器向导设计在基于Richards变换与Kuroda规则最低需采用五阶，就可以达到最平坦响应，但其过渡带过于平坦；采用最平坦响???阶跃阻抗低通滤波器原理图设计需要六阶就可以达到设计参数要求，同时该方法设计的滤波器过渡带比采用向导设计的要陡峭；采用切比雪夫设计的滤波器所需节数需五阶，但其通带内会出现波纹。 本文的设计结果和结论为微波滤波器的设计提供了重要的理论参考。 关键词：ADS，巴特沃兹，切比雪夫，Richards ，Kuroda，低通滤波器。 Stepped?impedance?of?microwave?low-pass?filter?design?and?simulation Design Description Microwave?filters?in?a?wireless?communication?system?is essential,?and?play a?role?in?band?and?channel?selection,?and??of?spurious.When?the?RF?circuit?design,?often?used?filter?wants?spectrum?signal?is extracted?from?the?signal.?Angilent?ADS software?can?support?from?the?module to?the?system?design,?able to?complete?microwave?circuit?design，communication?design,?RFIC?design,?so?is?the?current?choice?for?RF?and microwave?circuit?design?engineering?software. This article?mainly?three?ways?to?meet?the?requirements?of?the?task,?the specific?parameters?for??as at?frequencies?low?pass?cut-off?frequency?of=2.5GHz?; insertion?loss?greater than?20dB?at?the?=4GHz??input?output impedance?is?50,?based on?the?theory?of?Butterworth,?Chebyshev?,?Richards rules?of?transformation?and?Kuroda,?and?the?three?methods?of?design?of?the filter.?In based on Richards transform and Kuroda rules using Filter Wizard design just used four order, on can reached most flat response, but its transition with too flat; used principle figure design of parameter requirements, while the method design of filter transition with than used wizard design of to steep; used cut than snow of filter by needed section number just five order, while transition with than former are stee,But?it?appears?in?the?pass band?ripple. This?design?results?and