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I can simulate a typical helix antenna without any problem (in CST MWS)... but i want to have a tapered-wire helix* , so when i taper the helix and simulate it , i encounter with these errors :
in Integral eq. solver :
could not read mesh
in Time domain solver ...
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)