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求助 关于ADS differential port设置的问题

05-08
我在做耦合电感layout的时候,需要在电感两端加上差模和共模的激励,我使用了port editor中的differential port,但是,在设置associate with port number的时候,出现如下提示:
Port P2 cannot be associated with port number 1.
If they are in the same reference plane, and you want to associate them:
Please set both ports to the correct Port Type before
setting ^Associate with port number^
请问可能是什么原因,设置步骤我都按照manual中的步骤,应该没有问题。
manual中提到的differential port 要求
Differential ports should be used in situations where an electric field is likely to build up between two ports (odd modes propagate). This can occur when:
  • The two ports are close together
  • There is no ground plane in the circuit or the ground plane is relatively far away
  • One port behaves (to a degree) like a ground to the other port, and polarity between the ports is developed.
  • The ports are connected to objects that are on strip metallization layers.
设置方法:
  • To define a differential port:
  1. Choose Momentum > Port Editor .
  2. Select the port that you want to assign this type to. Note the port number.
  3. In the Port Editor dialog box, under Port Type, select Differential .
  4. Under Polarity, make sure that Normal is selected.
  5. Click Apply .
  6. Select the second port.
  7. In the Port Editor dialog box, under Port Type, select Differential .
  8. Under Polarity, select Reversed .
  9. Under Associate with port number, enter the number of the previously-selected port.
  10. Click Apply .
  11. Repeat these steps for other differential port pairs in the circuit.
  12. Click OK to dismiss the dialog box.
可能哪里出了问题,请大家赐教!谢谢!

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