ADS射频滤波器设计中的Kuroda变换问题

山翁

ADS中用DesignGuide设计好滤波器以后，将LC元件转换成Tline，然后利用Kuroda规则将Tline变换成Tline的时候出现了一个问题：

ADS中提示：
                Topologies shown in grey are not available for transformation.
                Only 45 degree lines can be transformed using these identities

这样的话，我在设计低通滤波器的时候确实是没有问题的，

但是在设计高通，带通，带阻的时候，LC转换成的TLine的的电长度都不是45度，导致我就无法在软件中进行Kuroda变换。

从理论上讲，Kuroda规则针对也绝不是E=45度的情况吧。

我到底应该如何处理呢？是我软件没搞透呢，还是软件就真的只能对E=45度的TLine进行Kuroda变换？

谢谢各位了

Franklink

我来看下，...

lbtxs

这个问题也遇到了啊，请各位大师看看怎么解决啊？

abley108

能不能透露你用的是ads用的是哪个版本

hongxiang85

Kuroda法则对高通和带通是不适用的

eersan

遇到相同问题，用的是15版的，貌似help中是这样说的TLine to TLine Transforms (Kuroda Identities)
The TLine to TLine transforms are typically used to transform series short-circuited stubs to parallel open circuited stubs in preparation for implementation in planar transmission line technologies. However, these operations only work on Unit Element lines with electrical lengths of 45 degrees. Therefore, when performing lumped to ideal distributed transformations, you must perform substitutions that conform to this Unit Element specification. Preferred stubs (highlighted in blue on the graphical area) as well as series transmission lines (transformed with the Unit Element box checked) can be transformed in this way. When adding transmission line elements before or after the network, the electrical length is 45 degrees and only the characteristic impedance must be specified.  However那一句说明只能用45度单位元件，而带阻带通貌似不用45度的线长吧。纯属个人观点，有误勿怪