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HFSS and incident wave excitation problem

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JI

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hfss incident wave excitation

Hello all,

I'm simulating a filter structure where are two infinite large planes. I have used incident wave (Herzian-dipole) excitation and I have PML boundaries. The filter structure should be periodic so I can't use physical ports. The problem is that when I use incident wave excitation, the resonant frequence goes to wrong place. If I fit L-shaped resonator for exempel to 5GHz I get resonant frequence to 4GHz. If I use lumped excitation, resonant frequence goes to right place. Can someone help me about this problem?
 

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