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Doubt in designing antenna with cavity in hfss

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priyarajan

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HI,
i have designed an cavity backed antenna in driven terminal using two co-axial feed.MY coaxial feed length is 40mm..if i assingned air as material to the cavity i can run the simulation without the error and my return loss value is less than -10db.if i am assigning copper as material to the cavity i am getting very low return loss.what material should i assign to cavity.should the height of the cavity be equal to that of the feed .
 

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