There are fundamental limits on the capacity of a radio channel [1], but I understand we're not really near them yet. I haven't read the linked paper in detail, but I have attended a seminar by the lead author, where he gave a summary in plain English. I gather the limit is related to the surface area of the volume that the antenna occupies, measured in wavelengths.
I think it's a fascinating result, as in my mind such results are closely linked with some very fundamental physics and maybe even an ultimate information theoretic description of the universe. I'm probably overstepping the mark with that unsupported comment, but it is nice to think about.
I think it's a fascinating result, as in my mind such results are closely linked with some very fundamental physics and maybe even an ultimate information theoretic description of the universe. I'm probably overstepping the mark with that unsupported comment, but it is nice to think about.
[1] http://www.itr.unisa.edu.au/~alex/papers/HanlenGrant04.pdf