Directivity Results Too Low
Hi,
I am currently simulating some antennas in the frequency range 3 to 30 MHz. When examining the far field results, it appears that the directivity values are too low. Because my simulation has a ground plane, the maximum directivity should be at least be twice that of an isotropic radiator, or 3 dBi. However, The maximum directivity that I am obtaining is around 0.25 dBi. In addition to this, the directivity is in other places very low (around -15 dBi). This would be okay by itself, but coupled with the low maximum directivity, this also does not make sense to me.
Can you help? I have attached my project file and postFEKO file. My thoughts are that there are some settings within FEKO that I must have set incorrectly for this to be happening. I've had the same issue with other EM solvers, but cannot find the cause of this within FEKO.
Thanks.