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HFSS Lumped port direction

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dkocer

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I designed a prob fed microstrip patch antenna and used Lumped port but I dont know which direction will I draw the integration line for the port? When I changed the direction (x or y axis) the results were change. could anybody help me?
 

streamlet

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Rule of thumb: to set one end of the integration line on the edge of the upper radiator patch, and the other on the edge of the lower gnd plane.
 

dkocer

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I did the integration line started from the gnd plane to upper pathc. I hope it is true.
 

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