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CPW excitation problem in CST

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tyyang

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cpw excitation

Hi, everybody,
I encount a problem in CST when I try to excite the grounded CPW. When I set the boundary condition of the port side to be PEC, the port field of CPW looks right. But when I set the boundary condition of port side to be open, then the port field distributuion of the CPW becomes wrong. I don't know where I make a mistake. Is there anyone encount the same problem? Would some one help me to check it ?? The CPW file is attached.
 

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