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Design and simulation of helix fed reflector antenna in L-band - can anyone help?

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smhosseini

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1) Best software for simulating it?
2) I simulate my designed structure with CST MWS (integral eq. solver) but the gain is very bad. For a dish of 120 cm the gain is less than 15-16 dB and I think this is very low. What mistake did make? feed is a 6-turn helix antenna.(freq. band 1.1-1.7 GHz)
 

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