Re: Effect of spherical and plane wave in the radiation patt
Through the lens, of course, directivity will be increased.
For example, one arbitrary ideal point source generate the spherical wave..
so, the radiation pattern become a isotropic pattern. that, Directivity=1 dBi !!
but, if the spherical wave can be transformed to plane wave (perpectly in one direction) through lens, this radiation patten of that point source with such a ideal lens will be very very high directive pattern. over 20dBi ~
I'm wondering my short knowldege could be helpful to your question. ^^