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Doubt in designing cavity backed antenna

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priyarajan

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I have designed a cavity backed antenna.when i assigned copper to the cavity .i found the following errors
HFSSDesign1 (DrivenTerminal)
[warning] Solving inside a solid with high conductivity may require a large mesh (8:21:06 PM Sep 15, 2016)
[error] Adaptive solution setup, process hf3d error: Failed to solve the port 1 due to lack of precision. The likely cause is that the frequency is too low. (8:27:30 PM Sep 15, 2016)
[error] Simulation completed with execution error on server: Local Machine. (8:27:30 PM Sep 15, 2016)
but when i assigned material as air ti the cavity the design gives a return loss with less then -20db.can i assign air as material to cavity .or what material should i assign ti the cavity.
 

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