[互助]求助 关于ADS differential port设置的问题

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： )ZrS{vY  
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Port P2 cannot be associated with port number 1. &B! o,qp  
If they are in the same reference plane, and you want to associate them: W^3uEm&l!)  
Please set both ports to the correct Port Type before |#1(Z-}  
setting ^Associate with port number^ PP:(EN1  
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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。 ?(*t@ {k  
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manual中提到的differential port 要求 +xc'1id@[  
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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: K=!Bh*  

• 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： DvvT?K  
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• To define a differential port: !T]
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[list=1]

Choose Momentum > Port Editor .

Select the port that you want to assign this type to. Note the port number.

In the Port Editor dialog box, under Port Type, select Differential .

Under Polarity, make sure that Normal is selected.

Click Apply .

Select the second port.

In the Port Editor dialog box, under Port Type, select Differential .

Under Polarity, select Reversed .

Under Associate with port number, enter the number of the previously-selected port.

Click Apply .

Repe .. [,2|Flf e  
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