ADS新手：初学者级问题

大家好。
我是一名大学生，目前正在使用ADS作为我的学期项目。
目标是设计具有特定规格的微波LNA。
我目前正在尝试匹配输入以获得最大可用增益。
我用增益和噪音圈来表达我的观点。
该点对应于18.5 + j 22.75（非标准化）。
我的终点都是50欧姆。
由于我是ADS的新手，我开始以我所知道的唯一方式开始这样做：我建立了一个带有两个50欧姆终端的新原理图。
在两者之间，我已经放置了一个微带线的L网络，Z0 = 50.他们的线路要调整，使得Zin变为18.5 + j 22.75。
我使用史密斯图表实用程序从50映射到阻抗，并使用linecalc（使用我的基板模型）来计算我的线长和开放存根的长度。
但是当我将这些值放在网络中并模拟找到Zin时，我得不到18.5 + j 22.75。
我希望这很清楚。
我附上了我的文件供您查看。



     以下为原文

  Hello everyone. I am a college student currently using ADS for my term project. The objective is to design a microwave LNA with certain specs. I am currently trying to match the input for max available gain. I used the gain and noise circles to pick my point.  

The point corresponds to 18.5 + j 22.75 (non-normalized). My terminations are all 50 Ohm. Since I am new to ADS, I started doing this the only way I know: I build a new schematic with two 50 Ohms terminations. In between, I have placed an L network of microstrip lines with Z0 = 50. Their lines are to be adjusted such that Zin becomes 18.5 + j 22.75.  

I used the smith chart utility to map from 50 to that impedance and used linecalc (with my substrate model) to calculate the lengths of my line length and open stub. But when I place these values in the network and simulate to find Zin, I do not get 18.5 + j 22.75.  

I hope this is clear enough. I attached my files for your viewing.   
附件

• Project.rar220.0 KB