@Syed wrote:
We’ve done some rough modeling and it looks like 15-degrees for the cone’s slant angle is optimal. A 5-inch cone height yields a theoretical 9 dB increase at 10.7 GHz, but at the high end of the band, the simulation is only showing another 3 dB. The problem seems to be with placing the cone over the plastic LNB. That gap is throwing the pattern off at 11.7 GHz.
I might be fabricating a 15-degree cone next week, or just browse around for metal funnels.
If the LNB had no plastic case, then the performance would be even better. It’s kind of a pain to shuck the case–and can be dangerous if not careful (I’ve cut myself being lazy).
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