Why lumped port must be at the boundary??

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shashank451180

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i have designed antenna in HFSS. but my lumped port is not touching boundary of substrate (2mm away from boundary), and still i'm getting proper results in simulation. but, when i change dimensions of feed and put lumped port at boundary then i'm not getting any results.
so, if i keep that port 2mm away, will there be any problem in fabrication??
 

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