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a question about HFSS

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ChowChen

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hi, i use hfss to simulate a horn antenna,frequency is 35G Hz,aperture is about 30 mm.But i add a slot in horn. i first set material as pec,then i set material as aluminum. i find the pattern has a different about θ=0, i excite by TM01.
Who can explain?
Thankx
 

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