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:
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 . Repeat these steps for other differential port pairs in the circuit. 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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