CST Transient， Frequency and Integral Solver Different Results

Hello,

I am simulating a small satellite body (60x60x50) cm, with two CP square patch antenna's. I am interested in the combined pattern of the antenna's with the satellite body. Earlier i was using Transient Solver to simulate the body and the results were okish (Combined Gain = 7 dB).

A friend of mine told me that for better results I should go for either Integral or Frequency solver, so i tried both of them, now the thing is that the combined results of all three solvers are completely different... I achieved a gain of (4 dB at PHI=0) in the case of frequency solver and (6.7 dB at PHI=0) in Integral solver..... Apart from Gain Combined Patterns are completely different from each other :(

So now i am confused as to which solver to use and which results are accurate :/ ... Any help in this regard would be highly appreciated ... Thank you.

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