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微带线滤波器设计

于 2020-12-07 发布
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通过ADS软件进行微带滤波器的设计,同时采用ADS软件的优化方法,对微带滤波器进行优化。最后采用后仿真验证结果是否正确。山国武技文在线微带滤波器设计集中参数向微带分布参数的转变在微波电路中,微带传输线其实就是个分布参教电路,常用微带结构来模拟集总元件咆感和电容,以实现所需的微波电路。我们利用平行耦合线构成的倒置转换器电路来实现电路中谐振电路的并联耦合,图经变换后的电路如图为只含并联电感的低通原型,反之对图可变换成只有串联电感的低迸原型c,Pant"21+11图只含一种元件的低通原型根据分段待输入阻抗导纳等效法得出由低通原型滤波器得到变形低通原型滤波器后,再利用带通滤波器与低通原型的频率变換关系,将变形低通电路中的并联电容或串联电感变换成带通滤波器的并联谐振电路或串联谐振电路如图所示,便构成了微波带通滤波器的等效电路。5图含倒置转换器电路的等效低通原型滤波器显然,用半波长来代替谐振电路,再通过微带间的耦合,即转换器,来实现微带带通滤波器微带滤波器实例微带滤波器的指标为:通带频率通带内波纹指数为,阻带边频±外衰减大于。则为我们根据式得具有波纹的阶切比雪夫滤波器的元件参数为再利用公式计算出奇偶模特性阻抗得计算结果如表。山国武技文在线表奇偶模特性阻抗值0213604]6062950.(417548000031824846516400318200417548.00521802136041.606295这样,可以利用软什如图来计算微带尺寸。a LineCalc/unt itedMSUB DEFAULIompohert arameters48460150247381900模块通过上面计算,即可设计出微带结构带电路,结构如图中结构所示。仿真优化上面计算出米的微带尺寸是非常不精确的,图是对其尺寸的仿真,对可以看出仿真出来的通带中心频率与设计频率有很大差别,中心频率偏移到这是由上面一系列的计算而导致的误差所造成的。为此,我们要借助软什对其优化。山国利技记文在线eq图传输、反射系数曲线中优化电路如图,因为单位耦合微带线主要有三个因素即长度,宽度,和距离。要想调整其中心频率,我们可以改变参数来进行优化,对于和,相对来说影响不大网【"[中口T468490p4t0LdIL-1. 0[HeH I mmd luI0自M|zHHE 0:H03; Thi759rm0887253mrl=mn3650mmPTIMH=[.984422 mHms-0681963 n L=xI mmm式arae="$式a="世m的时aan会"P东mh式 ancekartes"sP1seeC〓Pn才r=y图优化电烙结构进行多次优化后达到了我们所需要的效果,相关传输系数和反射系数,以及群延时分别如图所示山国武技文在线增四(a feq, GHz(b) req, GHz图参数及群延时由优化后的原理图生成的版图如图所示。接下来我们还可以对电跻版图进行矩量法仿真图微带版图这种版图的仿真是采用矩量法直接对电磁场进行计算得出的可将其仿真作为对原理图设计的验证。但有时版图仿真结果与原理图仿真结果还是存在差异那就得回到上一步对结构参数再次进行优化直到版图仿真结果满意如图所示。201c0图微带版图仿真曲线()山国武技文在线结语利用软件来设计微带带通滤波器使设计的工作量大大减少,并且能够提高精度和效率降低成本。但要设计出高性能的微带带通滤波器还需考虑更多的因素。总之,利用软件来设计给设计者带来了方便。参考文献杨爱琴,李小平滤波器的发展与展望电子科技,清华人学《徽带电路》编写组微带电路。北京:人民邽电出版社,。

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