[互助]HFSS 模擬波導阻抗

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我想了解波導的阻抗是否隨者公式 Zte = (377)/(1-(fc/f)^2)^0.5 變化 &M3KJ I0L  
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模擬X band (8-13 GHz),WR 90 (波導) 400 mil * 900mil :Sd`4
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趨勢大致上與公式是一致的, T4}Wg=UKg  
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但是實際上的阻抗值,計算值和模擬值會落差50ohm jy>?+hm?  
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以中心頻10.5GHz 來說,模擬值為430ohm, ,UVu.RjXN  
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但是計算值卻為482 ohm k$f2i,7'  
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是waveport設定有問題,還是其他問題? Nr*X1lJ6  
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