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HFSS simulation problem

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sams01

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I have simulated a aperture coupled patch antenna array, but it has difference in 3D polar port and rectangular port. Why are the gain values of the two graphs different? max Gain is 9.9dB in 3D polar port, but it is different in rectangular port (center frequency:28Ghz).
 

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Welcome, sams01,

I assume by "port", you meant to say "plot". It's hard to tell from your 3D plot due to the absence of a scale, but it looks like ~2dBi gain might be correct.

There could be other issues. Is your analysis solution frequency 28 GHz? What type of sweep are you performing?
 

Welcome, sams01,

I assume by "port", you meant to say "plot". It's hard to tell from your 3D plot due to the absence of a scale, but it looks like ~2dBi gain might be correct.

There could be other issues. Is your analysis solution frequency 28 GHz? What type of sweep are you performing?
solution frequency is 28 GHz, and use the fast sweep type.
 

Alright, as far as I can tell then, the data are correct. The plots both seem to show roughly 2dB right at broadside (phi = 0, theta = 0).

It looks like the peak gain is somewhere around phi = 0, theta = 15deg.
 

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